Fixed help length to prevent horizontal scroll in README

Dockerfile

@@ -2,9 +2,16 @@ FROM golang:1.9 as builder
 
 WORKDIR /go/src/mikefarah/yq
 
+# cache devtools
+COPY ./scripts/devtools.sh /go/src/mikefarah/yq/scripts/devtools.sh
+RUN ./scripts/devtools.sh
+
+# cache vendor
+COPY ./vendor/vendor.json /go/src/mikefarah/yq/vendor/vendor.json
+RUN govendor sync
+
 COPY . /go/src/mikefarah/yq
 
-RUN scripts/devtools.sh
 RUN CGO_ENABLED=0 make local build
 
 # Choose alpine as a base image to make this useful for CI, as many

README.md

@@ -12,9 +12,15 @@ On Ubuntu and other Linux distros supporting `snap` packages:
 ```
 snap install yq
 ```
+On Ubuntu 16.04 or higher from Debian package:
+```
+sudo add-apt-repository ppa:rmescandon/yq
+sudo apt update
+sudo apt install yq -y
+```
 or, [Download latest binary](https://github.com/mikefarah/yq/releases/latest) or alternatively:
 ```
-go get github.com/mikefarah/yq
+go get gopkg.in/mikefarah/yq.v2
 ```
 
 ## Run with Docker
@@ -44,6 +50,7 @@ docker run -it -v ${PWD}:/workdir mikefarah/yq sh
 - Pipe data in by using '-'
 - Merge multiple yaml files where each additional file sets values for missing or null value keys.
 - Merge multiple yaml files with overwrite to support overriding previous values.
+- Supports multiple documents in a single yaml file
 
 ## [Usage](http://mikefarah.github.io/yq/)
 
@@ -55,16 +62,15 @@ Usage:
   yq [command]
 
 Available Commands:
-  delete      yq d [--inplace/-i] sample.yaml a.b.c
+  delete      yq d [--inplace/-i] [--doc/-d index] sample.yaml a.b.c
   help        Help about any command
-  merge       yq m [--inplace/-i] [--overwrite/-x] sample.yaml sample2.yaml
-  new         yq n [--script/-s script_file] a.b.c newValueForC
-  read        yq r sample.yaml a.b.c
-  write       yq w [--inplace/-i] [--script/-s script_file] sample.yaml a.b.c newValueForC
+  merge       yq m [--inplace/-i] [--doc/-d index] [--overwrite/-x] sample.yaml sample2.yaml
+  new         yq n [--script/-s script_file] a.b.c newValue
+  read        yq r [--doc/-d index] sample.yaml a.b.c
+  write       yq w [--inplace/-i] [--script/-s script_file] [--doc/-d index] sample.yaml a.b.c newValue
 
 Flags:
   -h, --help      help for yq
-  -j, --tojson    output as json
   -t, --trim      trim yaml output (default true)
   -v, --verbose   verbose mode
   -V, --version   Print version information and quit
@@ -75,6 +81,10 @@ Use "yq [command] --help" for more information about a command.
 ## Contribute
 1. `make [local] vendor`
 2. add unit tests
-3. apply changes
+3. apply changes (use govendor with a preference to [gopkg](https://gopkg.in/) for package dependencies)
 4. `make [local] build`
-5. profit
+5. If required, update the user documentation 
+    - Update README.md and/or documentation under the mkdocs folder
+    - `make [local] build-docs`
+    - browse to docs/index.html and check your changes 
+6. profit

commands_test.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/spf13/cobra"
+	"gopkg.in/spf13/cobra.v0"
 )
 
 func getRootCommand() *cobra.Command {
@@ -73,30 +73,6 @@ func TestRootCmd_TrimShort(t *testing.T) {
 	}
 }
 
-func TestRootCmd_ToJsonLong(t *testing.T) {
-	cmd := getRootCommand()
-	result := runCmd(cmd, "--tojson")
-	if result.Error != nil {
-		t.Error(result.Error)
-	}
-
-	if !outputToJSON {
-		t.Error("Expected outputToJSON to be true")
-	}
-}
-
-func TestRootCmd_ToJsonShort(t *testing.T) {
-	cmd := getRootCommand()
-	result := runCmd(cmd, "-j")
-	if result.Error != nil {
-		t.Error(result.Error)
-	}
-
-	if !outputToJSON {
-		t.Error("Expected outputToJSON to be true")
-	}
-}
-
 func TestRootCmd_VersionShort(t *testing.T) {
 	cmd := getRootCommand()
 	result := runCmd(cmd, "-V")
@@ -128,6 +104,15 @@ func TestReadCmd(t *testing.T) {
 	assertResult(t, "2\n", result.Output)
 }
 
+func TestReadMultiCmd(t *testing.T) {
+	cmd := getRootCommand()
+	result := runCmd(cmd, "read -d 1 examples/multiple_docs.yaml another.document")
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+	assertResult(t, "here\n", result.Output)
+}
+
 func TestReadCmd_ArrayYaml(t *testing.T) {
 	cmd := getRootCommand()
 	result := runCmd(cmd, "read examples/array.yaml [0].gather_facts")
@@ -293,7 +278,16 @@ func TestReadCmd_NoTrim(t *testing.T) {
 
 func TestReadCmd_ToJson(t *testing.T) {
 	cmd := getRootCommand()
-	result := runCmd(cmd, "-j read examples/sample.yaml b.c")
+	result := runCmd(cmd, "read -j examples/sample.yaml b.c")
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+	assertResult(t, "2\n", result.Output)
+}
+
+func TestReadCmd_ToJsonLong(t *testing.T) {
+	cmd := getRootCommand()
+	result := runCmd(cmd, "read --tojson examples/sample.yaml b.c")
 	if result.Error != nil {
 		t.Error(result.Error)
 	}
@@ -334,17 +328,6 @@ func TestNewCmd_Verbose(t *testing.T) {
 	assertResult(t, expectedOutput, result.Output)
 }
 
-func TestNewCmd_ToJson(t *testing.T) {
-	cmd := getRootCommand()
-	result := runCmd(cmd, "-j new b.c 3")
-	if result.Error != nil {
-		t.Error(result.Error)
-	}
-	expectedOutput := `{"b":{"c":3}}
-`
-	assertResult(t, expectedOutput, result.Output)
-}
-
 func TestWriteCmd(t *testing.T) {
 	content := `b:
   c: 3
@@ -363,6 +346,50 @@ func TestWriteCmd(t *testing.T) {
 	assertResult(t, expectedOutput, result.Output)
 }
 
+func TestWriteMultiCmd(t *testing.T) {
+	content := `b:
+  c: 3
+---
+apples: great
+`
+	filename := writeTempYamlFile(content)
+	defer removeTempYamlFile(filename)
+
+	cmd := getRootCommand()
+	result := runCmd(cmd, fmt.Sprintf("write %s -d 1 apples ok", filename))
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+	expectedOutput := `b:
+  c: 3
+---
+apples: ok
+`
+	assertResult(t, expectedOutput, result.Output)
+}
+
+func TestWriteMultiAllCmd(t *testing.T) {
+	content := `b:
+  c: 3
+---
+apples: great
+`
+	filename := writeTempYamlFile(content)
+	defer removeTempYamlFile(filename)
+
+	cmd := getRootCommand()
+	result := runCmd(cmd, fmt.Sprintf("write %s -d * apples ok", filename))
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+	expectedOutput := `b:
+  c: 3
+apples: ok
+---
+apples: ok`
+	assertResult(t, expectedOutput, strings.Trim(result.Output, "\n "))
+}
+
 func TestWriteCmd_EmptyArray(t *testing.T) {
 	content := `b: 3`
 	filename := writeTempYamlFile(content)
@@ -432,7 +459,7 @@ func TestWriteCmd_Inplace(t *testing.T) {
 	gotOutput := readTempYamlFile(filename)
 	expectedOutput := `b:
   c: 7`
-	assertResult(t, expectedOutput, gotOutput)
+	assertResult(t, expectedOutput, strings.Trim(gotOutput, "\n "))
 }
 
 func TestWriteCmd_Append(t *testing.T) {
@@ -472,6 +499,95 @@ b:
 	assertResult(t, expectedOutput, result.Output)
 }
 
+func TestDeleteYaml(t *testing.T) {
+	content := `a: 2
+b:
+  c: things
+  d: something else
+`
+	filename := writeTempYamlFile(content)
+	defer removeTempYamlFile(filename)
+
+	cmd := getRootCommand()
+	result := runCmd(cmd, fmt.Sprintf("delete %s b.c", filename))
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+
+	expectedOutput := `a: 2
+b:
+  d: something else
+`
+	assertResult(t, expectedOutput, result.Output)
+}
+
+func TestDeleteYamlArray(t *testing.T) {
+	content := `- 1
+- 2
+- 3	
+`
+	filename := writeTempYamlFile(content)
+	defer removeTempYamlFile(filename)
+
+	cmd := getRootCommand()
+	result := runCmd(cmd, fmt.Sprintf("delete %s [1]", filename))
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+
+	expectedOutput := `- 1
+- 3
+`
+	assertResult(t, expectedOutput, result.Output)
+}
+
+func TestDeleteYamlMulti(t *testing.T) {
+	content := `apples: great
+---
+- 1
+- 2
+- 3
+`
+	filename := writeTempYamlFile(content)
+	defer removeTempYamlFile(filename)
+
+	cmd := getRootCommand()
+	result := runCmd(cmd, fmt.Sprintf("delete -d 1 %s [1]", filename))
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+
+	expectedOutput := `apples: great
+---
+- 1
+- 3
+`
+	assertResult(t, expectedOutput, result.Output)
+}
+
+func TestDeleteYamlMultiAllCmd(t *testing.T) {
+	content := `b:
+  c: 3
+apples: great
+---
+apples: great
+something: else
+`
+	filename := writeTempYamlFile(content)
+	defer removeTempYamlFile(filename)
+
+	cmd := getRootCommand()
+	result := runCmd(cmd, fmt.Sprintf("delete %s -d * apples", filename))
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+	expectedOutput := `b:
+  c: 3
+---
+something: else`
+	assertResult(t, expectedOutput, strings.Trim(result.Output, "\n "))
+}
+
 func TestMergeCmd(t *testing.T) {
 	cmd := getRootCommand()
 	result := runCmd(cmd, "merge examples/data1.yaml examples/data2.yaml")
@@ -488,6 +604,99 @@ c:
 	assertResult(t, expectedOutput, result.Output)
 }
 
+func TestMergeOverwriteCmd(t *testing.T) {
+	cmd := getRootCommand()
+	result := runCmd(cmd, "merge --overwrite examples/data1.yaml examples/data2.yaml")
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+	expectedOutput := `a: other
+b:
+- 1
+- 2
+c:
+  test: 1
+`
+	assertResult(t, expectedOutput, result.Output)
+}
+
+func TestMergeCmd_Multi(t *testing.T) {
+	cmd := getRootCommand()
+	result := runCmd(cmd, "merge -d1 examples/multiple_docs_small.yaml examples/data2.yaml")
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+	expectedOutput := `a: Easy! as one two three
+---
+a: other
+another:
+  document: here
+c:
+  test: 1
+---
+- 1
+- 2`
+	assertResult(t, expectedOutput, strings.Trim(result.Output, "\n "))
+}
+
+func TestMergeYamlMultiAllCmd(t *testing.T) {
+	content := `b:
+  c: 3
+apples: green
+---
+something: else`
+	filename := writeTempYamlFile(content)
+	defer removeTempYamlFile(filename)
+
+	mergeContent := `apples: red
+something: good`
+	mergeFilename := writeTempYamlFile(mergeContent)
+	defer removeTempYamlFile(mergeFilename)
+
+	cmd := getRootCommand()
+	result := runCmd(cmd, fmt.Sprintf("merge -d* %s %s", filename, mergeFilename))
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+	expectedOutput := `apples: green
+b:
+  c: 3
+something: good
+---
+apples: red
+something: else`
+	assertResult(t, expectedOutput, strings.Trim(result.Output, "\n "))
+}
+
+func TestMergeYamlMultiAllOverwriteCmd(t *testing.T) {
+	content := `b:
+  c: 3
+apples: green
+---
+something: else`
+	filename := writeTempYamlFile(content)
+	defer removeTempYamlFile(filename)
+
+	mergeContent := `apples: red
+something: good`
+	mergeFilename := writeTempYamlFile(mergeContent)
+	defer removeTempYamlFile(mergeFilename)
+
+	cmd := getRootCommand()
+	result := runCmd(cmd, fmt.Sprintf("merge --overwrite -d* %s %s", filename, mergeFilename))
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+	expectedOutput := `apples: red
+b:
+  c: 3
+something: good
+---
+apples: red
+something: good`
+	assertResult(t, expectedOutput, strings.Trim(result.Output, "\n "))
+}
+
 func TestMergeCmd_Error(t *testing.T) {
 	cmd := getRootCommand()
 	result := runCmd(cmd, "merge examples/data1.yaml")
@@ -504,7 +713,7 @@ func TestMergeCmd_ErrorUnreadableFile(t *testing.T) {
 	if result.Error == nil {
 		t.Error("Expected command to fail due to unknown file")
 	}
-	expectedOutput := `open fake-unknown: no such file or directory`
+	expectedOutput := `Error updating document at index 0: open fake-unknown: no such file or directory`
 	assertResult(t, expectedOutput, result.Error.Error())
 }
 
@@ -540,5 +749,5 @@ b:
 - 2
 c:
   test: 1`
-	assertResult(t, expectedOutput, gotOutput)
+	assertResult(t, expectedOutput, strings.Trim(gotOutput, "\n "))
 }

data_navigator.go

@@ -2,10 +2,9 @@ package main
 
 import (
 	"fmt"
-	"sort"
 	"strconv"
 
-	"gopkg.in/yaml.v2"
+	yaml "gopkg.in/mikefarah/yaml.v2"
 )
 
 func entryInSlice(context yaml.MapSlice, key interface{}) *yaml.MapItem {
@@ -194,23 +193,6 @@ func calculateValue(value interface{}, tail []string) (interface{}, error) {
 	return value, nil
 }
 
-func mapToMapSlice(data map[interface{}]interface{}) yaml.MapSlice {
-	var mapSlice yaml.MapSlice
-
-	for k, v := range data {
-		if mv, ok := v.(map[interface{}]interface{}); ok {
-			v = mapToMapSlice(mv)
-		}
-		item := yaml.MapItem{Key: k, Value: v}
-		mapSlice = append(mapSlice, item)
-	}
-
-	// because the parsing of the yaml was done via a map the order will be inconsistent
-	// apply order to allow a consistent output
-	sort.SliceStable(mapSlice, func(i, j int) bool { return mapSlice[i].Key.(string) < mapSlice[j].Key.(string) })
-	return mapSlice
-}
-
 func deleteMap(context interface{}, paths []string) yaml.MapSlice {
 	log.Debugf("deleteMap for %v for %v\n", paths, context)
 

data_navigator_test.go

@@ -5,7 +5,7 @@ import (
 	"sort"
 	"testing"
 
-	yaml "gopkg.in/yaml.v2"
+	yaml "gopkg.in/mikefarah/yaml.v2"
 )
 
 func TestReadMap_simple(t *testing.T) {

debian/changelog

@@ -0,0 +1,12 @@
+yq (2.0-0) bionic; urgency=medium
+
+  * Release 2.0.0
+
+ -- Roberto Mier Escandón <rmescandon@gmail.com>  Wed, 20 Jun 2018 10:29:53 +0200
+
+yq (1.15-0) bionic; urgency=medium
+
+  * Release 1.15
+
+ -- Roberto Mier Escandón <rmescandon@gmail.com>  Wed, 06 Jun 2018 11:32:03 +0200
+

debian/compat

@@ -0,0 +1 @@
+9

debian/control

@@ -0,0 +1,22 @@
+Source: yq
+Section: devel
+Priority: extra
+Maintainer: Roberto Mier Escandón <rmescandon@gmail.com>
+Build-Depends: debhelper (>= 9),
+               dh-golang,
+               golang-1.10-go,
+               rsync
+Standards-Version: 3.9.6
+Homepage: https://github.com/mikefarah/yq.git
+Vcs-Browser: https://github.com/mikefarah/yq.git
+Vcs-Git: https://github.com/mikefarah/yq.git
+
+Package: yq
+Architecture: all
+Built-Using: ${misc:Built-Using}
+Depends: ${shlibs:Depends},
+         ${misc:Depends}
+Description:
+ a lightweight and portable command-line YAML processor
+ .
+ The aim of the project is to be the [jq](https://github.com/stedolan/jq) or sed of yaml files.

debian/copyright

@@ -0,0 +1,7 @@
+Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: yq
+Source: https://github.com/mikefarah/yq.git
+
+Files: *
+Copyright: 2017 Mike Farah Ltd. All rights reserved
+License: Proprietary

debian/gbp.conf

@@ -0,0 +1,2 @@
+[DEFAULT]
+pristine-tar = True

debian/rules

@@ -0,0 +1,59 @@
+#!/usr/bin/make -f
+#
+# Copyright (C) 2018 Roberto Mier Escandón <rmescandon@gmail.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 3 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+PROJECT := yq
+OWNER := mikefarah
+REPO := github.com
+GOVERSION := 1.10
+export DH_OPTIONS
+export DH_GOPKG := ${REPO}/${OWNER}/${PROJECT}
+export GOROOT := /usr/lib/go-${GOVERSION}
+export GOPATH := ${CURDIR}/_build
+export GOBIN := ${GOPATH}/bin
+export PATH := ${GOROOT}/bin:${GOBIN}:${PATH}
+BLDPATH := $(shell dpkg-architecture -qDEB_BUILD_GNU_TYPE)
+SRCDIR := ${CURDIR}/_build/src/${DH_GOPKG}
+DESTDIR := ${CURDIR}/debian/${PROJECT}
+BINDIR := /usr/bin
+ASSETSDIR := /usr/share/${PROJECT}
+
+%:
+	dh $@ --buildsystem=golang --with=golang
+
+override_dh_auto_build:
+	mkdir -p ${SRCDIR}
+	mkdir -p ${GOBIN}
+	# copy project to local srcdir to build from there
+	rsync -avz --progress --exclude=obj-${BLDPATH} --exclude=debian . $(SRCDIR)
+	# build go code
+	(cd ${SRCDIR} && go install ./...)
+
+override_dh_auto_test:
+	(cd ${SRCDIR} && go test -v ./...)
+
+override_dh_auto_install:
+	mkdir -p ${DESTDIR}/${BINDIR}
+	mkdir -p ${DESTDIR}/${ASSETSDIR}
+	cp ${CURDIR}/_build/bin/yq ${DESTDIR}/${BINDIR}
+	cp -rf ${SRCDIR}/LICENSE ${DESTDIR}/${ASSETSDIR}
+	cp -rf ${SRCDIR}/README.md ${DESTDIR}/${PLUGINSDIR}
+	chmod a+x ${DESTDIR}/${BINDIR}/yq
+
+override_dh_auto_clean:
+	dh_clean
+	rm -rf ${CURDIR}/obj-${BLDPATH}
+	rm -rf ${CURDIR}/_build

debian/source/format

@@ -0,0 +1 @@
+3.0 (native)

docs/convert/index.html

@@ -372,7 +372,7 @@
                   <h1>Convert</h1>
                 
                 <h3 id="yaml-to-json">Yaml to Json<a class="headerlink" href="#yaml-to-json" title="Permanent link">&para;</a></h3>
-<p>To convert output to json, use the --tojson (or -j) flag. This can be used with any command.</p>
+<p>To convert output to json, use the --tojson (or -j) flag. This can only be used with the read command.</p>
 <p>Given a sample.yaml file of:</p>
 <pre><code class="yaml">b:
   c: 2

docs/create/index.html

@@ -385,7 +385,7 @@
                 
                   <h1>Create</h1>
                 
-                <p>Yaml files can be created using the 'new' command. This works in the same way as the write command, but you don't pass in an existing Yaml file.</p>
+                <p>Yaml files can be created using the 'new' command. This works in the same way as the write command, but you don't pass in an existing Yaml file. Currently this does not support creating multiple documents in a single yaml file.</p>
 <pre><code>yq n &lt;path&gt; &lt;new value&gt;
 </code></pre>
 

docs/delete/index.html

@@ -287,6 +287,20 @@
     Deleting nodes in-place
   </a>
   
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents-delete-from-single-document" title="Multiple Documents - delete from single document" class="md-nav__link">
+    Multiple Documents - delete from single document
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents-delete-from-all-documents" title="Multiple Documents - delete from all documents" class="md-nav__link">
+    Multiple Documents - delete from all documents
+  </a>
+  
 </li>
       
         <li class="md-nav__item">
@@ -385,6 +399,20 @@
     Deleting nodes in-place
   </a>
   
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents-delete-from-single-document" title="Multiple Documents - delete from single document" class="md-nav__link">
+    Multiple Documents - delete from single document
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents-delete-from-all-documents" title="Multiple Documents - delete from all documents" class="md-nav__link">
+    Multiple Documents - delete from all documents
+  </a>
+  
 </li>
       
         <li class="md-nav__item">
@@ -413,10 +441,9 @@
                 
                   <h1>Delete</h1>
                 
-                <pre><code>yq d &lt;yaml_file|json_file&gt; &lt;path_to_delete&gt;
+                <pre><code>yq d &lt;yaml_file&gt; &lt;path_to_delete&gt;
 </code></pre>
 
-<p>This command can take a json file as input too, and will output yaml unless specified to export as json (-j)</p>
 <h3 id="to-stdout">To Stdout<a class="headerlink" href="#to-stdout" title="Permanent link">&para;</a></h3>
 <p>Given a sample.yaml file of:</p>
 <pre><code class="yaml">b:
@@ -469,6 +496,50 @@
 </code></pre>
 
 <p>will update the sample.yaml file so that the 'c' node is deleted</p>
+<h3 id="multiple-documents-delete-from-single-document">Multiple Documents - delete from single document<a class="headerlink" href="#multiple-documents-delete-from-single-document" title="Permanent link">&para;</a></h3>
+<p>Given a sample.yaml file of:</p>
+<pre><code class="yaml">something: else
+field: leaveMe
+---
+b:
+  c: 2
+field: deleteMe
+</code></pre>
+
+<p>then</p>
+<pre><code class="bash">yq w -d1 sample.yaml field
+</code></pre>
+
+<p>will output:</p>
+<pre><code class="yaml">something: else
+field: leaveMe
+---
+b:
+  c: 2
+</code></pre>
+
+<h3 id="multiple-documents-delete-from-all-documents">Multiple Documents - delete from all documents<a class="headerlink" href="#multiple-documents-delete-from-all-documents" title="Permanent link">&para;</a></h3>
+<p>Given a sample.yaml file of:</p>
+<pre><code class="yaml">something: else
+field: deleteMe
+---
+b:
+  c: 2
+field: deleteMeToo
+</code></pre>
+
+<p>then</p>
+<pre><code class="bash">yq w -d'*' sample.yaml field
+</code></pre>
+
+<p>will output:</p>
+<pre><code class="yaml">something: else
+---
+b:
+  c: 2
+</code></pre>
+
+<p>Note that '*' is in quotes to avoid being interpreted by your shell.</p>
 <h3 id="keys-with-dots">Keys with dots<a class="headerlink" href="#keys-with-dots" title="Permanent link">&para;</a></h3>
 <p>When specifying a key that has a dot use key lookup indicator.</p>
 <pre><code class="yaml">b:

docs/index.html

@@ -373,8 +373,14 @@
 <pre><code>snap install yq
 </code></pre>
 
+<p>On Ubuntu 16.04 or higher from Debian package:</p>
+<pre><code>sudo add-apt-repository ppa:rmescandon/yq
+sudo apt update
+sudo apt install yq -y
+</code></pre>
+
 <p>or, <a href="https://github.com/mikefarah/yq/releases/latest">Download latest binary</a> or alternatively:</p>
-<pre><code>go get github.com/mikefarah/yq
+<pre><code>go get gopkg.in/mikefarah/yq.v2
 </code></pre>
 
 <p><a href="https://github.com/mikefarah/yq">View on GitHub</a></p>

docs/merge/index.html

@@ -325,6 +325,20 @@
   
 </li>
       
+        <li class="md-nav__item">
+  <a href="#multiple-documents-merge-into-single-document" title="Multiple Documents - merge into single document" class="md-nav__link">
+    Multiple Documents - merge into single document
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents-merge-into-all-documents" title="Multiple Documents - merge into all documents" class="md-nav__link">
+    Multiple Documents - merge into all documents
+  </a>
+  
+</li>
+      
       
       
     </ul>
@@ -380,6 +394,20 @@
   
 </li>
       
+        <li class="md-nav__item">
+  <a href="#multiple-documents-merge-into-single-document" title="Multiple Documents - merge into single document" class="md-nav__link">
+    Multiple Documents - merge into single document
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents-merge-into-all-documents" title="Multiple Documents - merge into all documents" class="md-nav__link">
+    Multiple Documents - merge into all documents
+  </a>
+  
+</li>
+      
       
       
     </ul>
@@ -401,10 +429,9 @@
                 
                 <p>Yaml files can be merged using the 'merge' command. Each additional file merged with the first file will
 set values for any key not existing already or where the key has no value.</p>
-<pre><code>yq m &lt;yaml_file|json_file&gt; &lt;path&gt;...
+<pre><code>yq m &lt;yaml_file&gt; &lt;path&gt;...
 </code></pre>
 
-<p>This command can take a json file as input too, and will output yaml unless specified to export as json (-j)</p>
 <h3 id="to-stdout">To Stdout<a class="headerlink" href="#to-stdout" title="Permanent link">&para;</a></h3>
 <p>Given a data1.yaml file of:</p>
 <pre><code class="yaml">a: simple
@@ -497,6 +524,54 @@ d: false
 
 <p>Notice that 'b' does not result in the merging of the values within an array. The underlying library does not
 currently handle merging values within an array.</p>
+<h3 id="multiple-documents-merge-into-single-document">Multiple Documents - merge into single document<a class="headerlink" href="#multiple-documents-merge-into-single-document" title="Permanent link">&para;</a></h3>
+<p>Currently yq only has multi-document support for the <em>first</em> document being merged into. The remaining yaml files will have their first document selected.</p>
+<p>Given a data1.yaml file of:</p>
+<pre><code class="yaml">something: else
+---
+a: simple
+b: cat
+</code></pre>
+
+<p>and data3.yaml file of:</p>
+<pre><code class="yaml">b: dog
+</code></pre>
+
+<p>then</p>
+<pre><code class="bash">yq m -x -d1 data1.yaml data3.yaml
+</code></pre>
+
+<p>will output:</p>
+<pre><code class="yaml">something: else
+---
+a: simple
+b: dog
+</code></pre>
+
+<h3 id="multiple-documents-merge-into-all-documents">Multiple Documents - merge into all documents<a class="headerlink" href="#multiple-documents-merge-into-all-documents" title="Permanent link">&para;</a></h3>
+<p>Currently yq only has multi-document support for the <em>first</em> document being merged into. The remaining yaml files will have their first document selected.</p>
+<p>Given a data1.yaml file of:</p>
+<pre><code class="yaml">something: else
+---
+a: simple
+b: cat
+</code></pre>
+
+<p>and data3.yaml file of:</p>
+<pre><code class="yaml">b: dog
+</code></pre>
+
+<p>then</p>
+<pre><code class="bash">yq m -x -d'*' data1.yaml data3.yaml
+</code></pre>
+
+<p>will output:</p>
+<pre><code class="yaml">b: dog
+something: else
+---
+a: simple
+b: dog
+</code></pre>
                 
                   
                 

docs/read/index.html

@@ -256,6 +256,13 @@
     Splat
   </a>
   
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents" title="Multiple Documents" class="md-nav__link">
+    Multiple Documents
+  </a>
+  
 </li>
       
         <li class="md-nav__item">
@@ -385,6 +392,13 @@
     Splat
   </a>
   
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents" title="Multiple Documents" class="md-nav__link">
+    Multiple Documents
+  </a>
+  
 </li>
       
         <li class="md-nav__item">
@@ -467,6 +481,19 @@ bob:
 - apples
 </code></pre>
 
+<h3 id="multiple-documents">Multiple Documents<a class="headerlink" href="#multiple-documents" title="Permanent link">&para;</a></h3>
+<p>Given a sample.yaml file of:</p>
+<pre><code class="yaml">something: else
+---
+b:
+  c: 2
+</code></pre>
+
+<p>then</p>
+<pre><code class="bash">yq r -d1 sample.yaml b.c
+</code></pre>
+
+<p>will output the value of '2'.</p>
 <h3 id="arrays">Arrays<a class="headerlink" href="#arrays" title="Permanent link">&para;</a></h3>
 <p>You can give an index to access a specific element:
 e.g.: given a sample file of</p>

docs/search/search_index.json

@@ -2,7 +2,7 @@
     "docs": [
         {
             "location": "/",
-            "text": "yq\n\u00b6\n\n\nyq is a lightweight and portable command-line YAML processor\n\n\nThe aim of the project is to be the \njq\n or sed of yaml files.\n\n\nInstall\n\u00b6\n\n\nOn MacOS:\n\n\nbrew install yq\n\n\n\n\nOn Ubuntu and other Linux distros supporting \nsnap\n packages:\n\n\nsnap install yq\n\n\n\n\nor, \nDownload latest binary\n or alternatively:\n\n\ngo get github.com/mikefarah/yq\n\n\n\n\nView on GitHub",
+            "text": "yq\n\u00b6\n\n\nyq is a lightweight and portable command-line YAML processor\n\n\nThe aim of the project is to be the \njq\n or sed of yaml files.\n\n\nInstall\n\u00b6\n\n\nOn MacOS:\n\n\nbrew install yq\n\n\n\n\nOn Ubuntu and other Linux distros supporting \nsnap\n packages:\n\n\nsnap install yq\n\n\n\n\nOn Ubuntu 16.04 or higher from Debian package:\n\n\nsudo add-apt-repository ppa:rmescandon/yq\nsudo apt update\nsudo apt install yq -y\n\n\n\n\nor, \nDownload latest binary\n or alternatively:\n\n\ngo get gopkg.in/mikefarah/yq.v2\n\n\n\n\nView on GitHub",
             "title": "Install"
         },
         {
@@ -12,12 +12,12 @@
         },
         {
             "location": "/#install",
-            "text": "On MacOS:  brew install yq  On Ubuntu and other Linux distros supporting  snap  packages:  snap install yq  or,  Download latest binary  or alternatively:  go get github.com/mikefarah/yq  View on GitHub",
+            "text": "On MacOS:  brew install yq  On Ubuntu and other Linux distros supporting  snap  packages:  snap install yq  On Ubuntu 16.04 or higher from Debian package:  sudo add-apt-repository ppa:rmescandon/yq\nsudo apt update\nsudo apt install yq -y  or,  Download latest binary  or alternatively:  go get gopkg.in/mikefarah/yq.v2  View on GitHub",
             "title": "Install"
         },
         {
             "location": "/read/",
-            "text": "yq r <yaml_file|json_file> <path>\n\n\n\n\nThis command can take a json file as input too, and will output yaml unless specified to export as json (-j)\n\n\nBasic\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq r sample.yaml b.c\n\n\n\n\nwill output the value of '2'.\n\n\nFrom Stdin\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\ncat sample.yaml | yq r - b.c\n\n\n\n\nwill output the value of '2'.\n\n\nSplat\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\n---\nbob:\n  item1:\n    cats: bananas\n  item2:\n    cats: apples\n\n\n\n\nthen\n\n\nyq r sample.yaml bob.*.cats\n\n\n\n\nwill output\n\n\n- bananas\n- apples\n\n\n\n\nArrays\n\u00b6\n\n\nYou can give an index to access a specific element:\ne.g.: given a sample file of\n\n\nb:\n  e:\n    - name: fred\n      value: 3\n    - name: sam\n      value: 4\n\n\n\n\nthen\n\n\nyq r sample.yaml 'b.e[1].name'\n\n\n\n\nwill output 'sam'\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.\n\n\nArray Splat\n\u00b6\n\n\ne.g.: given a sample file of\n\n\nb:\n  e:\n    - name: fred\n      value: 3\n    - name: sam\n      value: 4\n\n\n\n\nthen\n\n\nyq r sample.yaml 'b.e[*].name'\n\n\n\n\nwill output:\n\n\n- fred\n- sam\n\n\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.\n\n\nKeys with dots\n\u00b6\n\n\nWhen specifying a key that has a dot use key lookup indicator.\n\n\nb:\n  foo.bar: 7\n\n\n\n\nyaml r sample.yaml 'b[foo.bar]'\n\n\n\n\nyaml w sample.yaml 'b[foo.bar]' 9\n\n\n\n\nAny valid yaml key can be specified as part of a key lookup.\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.",
+            "text": "yq r <yaml_file|json_file> <path>\n\n\n\n\nThis command can take a json file as input too, and will output yaml unless specified to export as json (-j)\n\n\nBasic\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq r sample.yaml b.c\n\n\n\n\nwill output the value of '2'.\n\n\nFrom Stdin\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\ncat sample.yaml | yq r - b.c\n\n\n\n\nwill output the value of '2'.\n\n\nSplat\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\n---\nbob:\n  item1:\n    cats: bananas\n  item2:\n    cats: apples\n\n\n\n\nthen\n\n\nyq r sample.yaml bob.*.cats\n\n\n\n\nwill output\n\n\n- bananas\n- apples\n\n\n\n\nMultiple Documents\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nsomething: else\n---\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq r -d1 sample.yaml b.c\n\n\n\n\nwill output the value of '2'.\n\n\nArrays\n\u00b6\n\n\nYou can give an index to access a specific element:\ne.g.: given a sample file of\n\n\nb:\n  e:\n    - name: fred\n      value: 3\n    - name: sam\n      value: 4\n\n\n\n\nthen\n\n\nyq r sample.yaml 'b.e[1].name'\n\n\n\n\nwill output 'sam'\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.\n\n\nArray Splat\n\u00b6\n\n\ne.g.: given a sample file of\n\n\nb:\n  e:\n    - name: fred\n      value: 3\n    - name: sam\n      value: 4\n\n\n\n\nthen\n\n\nyq r sample.yaml 'b.e[*].name'\n\n\n\n\nwill output:\n\n\n- fred\n- sam\n\n\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.\n\n\nKeys with dots\n\u00b6\n\n\nWhen specifying a key that has a dot use key lookup indicator.\n\n\nb:\n  foo.bar: 7\n\n\n\n\nyaml r sample.yaml 'b[foo.bar]'\n\n\n\n\nyaml w sample.yaml 'b[foo.bar]' 9\n\n\n\n\nAny valid yaml key can be specified as part of a key lookup.\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.",
             "title": "Read"
         },
         {
@@ -35,6 +35,11 @@
             "text": "Given a sample.yaml file of:  ---\nbob:\n  item1:\n    cats: bananas\n  item2:\n    cats: apples  then  yq r sample.yaml bob.*.cats  will output  - bananas\n- apples",
             "title": "Splat"
         },
+        {
+            "location": "/read/#multiple-documents",
+            "text": "Given a sample.yaml file of:  something: else\n---\nb:\n  c: 2  then  yq r -d1 sample.yaml b.c  will output the value of '2'.",
+            "title": "Multiple Documents"
+        },
         {
             "location": "/read/#arrays",
             "text": "You can give an index to access a specific element:\ne.g.: given a sample file of  b:\n  e:\n    - name: fred\n      value: 3\n    - name: sam\n      value: 4  then  yq r sample.yaml 'b.e[1].name'  will output 'sam'  Note that the path is in quotes to avoid the square brackets being interpreted by your shell.",
@@ -52,7 +57,7 @@
         },
         {
             "location": "/write/",
-            "text": "yq w <yaml_file|json_file> <path> <new value>\n\n\n\n\nThis command can take a json file as input too, and will output yaml unless specified to export as json (-j)\n\n\nTo Stdout\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq w sample.yaml b.c cat\n\n\n\n\nwill output:\n\n\nb:\n  c: cat\n\n\n\n\nFrom STDIN\n\u00b6\n\n\ncat sample.yaml | yq w - b.c blah\n\n\n\n\nAdding new fields\n\u00b6\n\n\nAny missing fields in the path will be created on the fly.\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq w sample.yaml b.d[0] \"new thing\"\n\n\n\n\nwill output:\n\n\nb:\n  c: cat\n  d:\n    - new thing\n\n\n\n\nAppending value to an array field\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n  d:\n    - new thing\n    - foo thing\n\n\n\n\nthen\n\n\nyq w sample.yaml \"b.d[+]\" \"bar thing\"\n\n\n\n\nwill output:\n\n\nb:\n  c: cat\n  d:\n    - new thing\n    - foo thing\n    - bar thing\n\n\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.\n\n\nUpdating files in-place\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq w -i sample.yaml b.c cat\n\n\n\n\nwill update the sample.yaml file so that the value of 'c' is cat.\n\n\nUpdating multiple values with a script\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n  e:\n    - name: Billy Bob\n\n\n\n\nand a script update_instructions.yaml of:\n\n\nb.c: 3\nb.e[0].name: Howdy Partner\n\n\n\n\nthen\n\n\nyq w -s update_instructions.yaml sample.yaml\n\n\n\n\nwill output:\n\n\nb:\n  c: 3\n  e:\n    - name: Howdy Partner\n\n\n\n\nAnd, of course, you can pipe the instructions in using '-':\n\n\ncat update_instructions.yaml | yq w -s - sample.yaml\n\n\n\n\nValues starting with a hyphen (or dash)\n\u00b6\n\n\nThe flag terminator needs to be used to stop the app from attempting to parse the subsequent arguments as flags:\n\n\nyq w -- my.path -3\n\n\n\n\nwill output\n\n\nmy:\n  path: -3\n\n\n\n\nKeys with dots\n\u00b6\n\n\nWhen specifying a key that has a dot use key lookup indicator.\n\n\nb:\n  foo.bar: 7\n\n\n\n\nyaml r sample.yaml 'b[foo.bar]'\n\n\n\n\nyaml w sample.yaml 'b[foo.bar]' 9\n\n\n\n\nAny valid yaml key can be specified as part of a key lookup.\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.",
+            "text": "yq w <yaml_file> <path> <new value>\n\n\n\n\nTo Stdout\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq w sample.yaml b.c cat\n\n\n\n\nwill output:\n\n\nb:\n  c: cat\n\n\n\n\nFrom STDIN\n\u00b6\n\n\ncat sample.yaml | yq w - b.c blah\n\n\n\n\nAdding new fields\n\u00b6\n\n\nAny missing fields in the path will be created on the fly.\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq w sample.yaml b.d[0] \"new thing\"\n\n\n\n\nwill output:\n\n\nb:\n  c: cat\n  d:\n    - new thing\n\n\n\n\nAppending value to an array field\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n  d:\n    - new thing\n    - foo thing\n\n\n\n\nthen\n\n\nyq w sample.yaml \"b.d[+]\" \"bar thing\"\n\n\n\n\nwill output:\n\n\nb:\n  c: cat\n  d:\n    - new thing\n    - foo thing\n    - bar thing\n\n\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.\n\n\nMultiple Documents - update a single document\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nsomething: else\n---\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq w -d1 sample.yaml b.c 5\n\n\n\n\nwill output:\n\n\nsomething: else\n---\nb:\n  c: 5\n\n\n\n\nMultiple Documents - update all documents\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nsomething: else\n---\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq w -d'*' sample.yaml b.c 5\n\n\n\n\nwill output:\n\n\nsomething: else\nb:\n  c: 5\n---\nb:\n  c: 5\n\n\n\n\nNote that '*' is in quotes to avoid being interpreted by your shell.\n\n\nUpdating files in-place\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq w -i sample.yaml b.c cat\n\n\n\n\nwill update the sample.yaml file so that the value of 'c' is cat.\n\n\nUpdating multiple values with a script\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n  e:\n    - name: Billy Bob\n\n\n\n\nand a script update_instructions.yaml of:\n\n\nb.c: 3\nb.e[0].name: Howdy Partner\n\n\n\n\nthen\n\n\nyq w -s update_instructions.yaml sample.yaml\n\n\n\n\nwill output:\n\n\nb:\n  c: 3\n  e:\n    - name: Howdy Partner\n\n\n\n\nAnd, of course, you can pipe the instructions in using '-':\n\n\ncat update_instructions.yaml | yq w -s - sample.yaml\n\n\n\n\nValues starting with a hyphen (or dash)\n\u00b6\n\n\nThe flag terminator needs to be used to stop the app from attempting to parse the subsequent arguments as flags:\n\n\nyq w -- my.path -3\n\n\n\n\nwill output\n\n\nmy:\n  path: -3\n\n\n\n\nKeys with dots\n\u00b6\n\n\nWhen specifying a key that has a dot use key lookup indicator.\n\n\nb:\n  foo.bar: 7\n\n\n\n\nyaml r sample.yaml 'b[foo.bar]'\n\n\n\n\nyaml w sample.yaml 'b[foo.bar]' 9\n\n\n\n\nAny valid yaml key can be specified as part of a key lookup.\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.",
             "title": "Write/Update"
         },
         {
@@ -75,6 +80,16 @@
             "text": "Given a sample.yaml file of:  b:\n  c: 2\n  d:\n    - new thing\n    - foo thing  then  yq w sample.yaml \"b.d[+]\" \"bar thing\"  will output:  b:\n  c: cat\n  d:\n    - new thing\n    - foo thing\n    - bar thing  Note that the path is in quotes to avoid the square brackets being interpreted by your shell.",
             "title": "Appending value to an array field"
         },
+        {
+            "location": "/write/#multiple-documents-update-a-single-document",
+            "text": "Given a sample.yaml file of:  something: else\n---\nb:\n  c: 2  then  yq w -d1 sample.yaml b.c 5  will output:  something: else\n---\nb:\n  c: 5",
+            "title": "Multiple Documents - update a single document"
+        },
+        {
+            "location": "/write/#multiple-documents-update-all-documents",
+            "text": "Given a sample.yaml file of:  something: else\n---\nb:\n  c: 2  then  yq w -d'*' sample.yaml b.c 5  will output:  something: else\nb:\n  c: 5\n---\nb:\n  c: 5  Note that '*' is in quotes to avoid being interpreted by your shell.",
+            "title": "Multiple Documents - update all documents"
+        },
         {
             "location": "/write/#updating-files-in-place",
             "text": "Given a sample.yaml file of:  b:\n  c: 2  then  yq w -i sample.yaml b.c cat  will update the sample.yaml file so that the value of 'c' is cat.",
@@ -97,7 +112,7 @@
         },
         {
             "location": "/delete/",
-            "text": "yq d <yaml_file|json_file> <path_to_delete>\n\n\n\n\nThis command can take a json file as input too, and will output yaml unless specified to export as json (-j)\n\n\nTo Stdout\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n  apples: green\n\n\n\n\nthen\n\n\nyq d sample.yaml b.c\n\n\n\n\nwill output:\n\n\nb:\n  apples: green\n\n\n\n\nFrom STDIN\n\u00b6\n\n\ncat sample.yaml | yq d - b.c\n\n\n\n\nDeleting array elements\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: \n    - 1\n    - 2\n    - 3\n\n\n\n\nthen\n\n\nyq d sample.yaml 'b.c[1]'\n\n\n\n\nwill output:\n\n\nb:\n  c:\n  - 1\n  - 3\n\n\n\n\nDeleting nodes in-place\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n  apples: green\n\n\n\n\nthen\n\n\nyq d -i sample.yaml b.c\n\n\n\n\nwill update the sample.yaml file so that the 'c' node is deleted\n\n\nKeys with dots\n\u00b6\n\n\nWhen specifying a key that has a dot use key lookup indicator.\n\n\nb:\n  foo.bar: 7\n\n\n\n\nyaml r sample.yaml 'b[foo.bar]'\n\n\n\n\nyaml w sample.yaml 'b[foo.bar]' 9\n\n\n\n\nAny valid yaml key can be specified as part of a key lookup.\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.",
+            "text": "yq d <yaml_file> <path_to_delete>\n\n\n\n\nTo Stdout\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n  apples: green\n\n\n\n\nthen\n\n\nyq d sample.yaml b.c\n\n\n\n\nwill output:\n\n\nb:\n  apples: green\n\n\n\n\nFrom STDIN\n\u00b6\n\n\ncat sample.yaml | yq d - b.c\n\n\n\n\nDeleting array elements\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: \n    - 1\n    - 2\n    - 3\n\n\n\n\nthen\n\n\nyq d sample.yaml 'b.c[1]'\n\n\n\n\nwill output:\n\n\nb:\n  c:\n  - 1\n  - 3\n\n\n\n\nDeleting nodes in-place\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n  apples: green\n\n\n\n\nthen\n\n\nyq d -i sample.yaml b.c\n\n\n\n\nwill update the sample.yaml file so that the 'c' node is deleted\n\n\nMultiple Documents - delete from single document\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nsomething: else\nfield: leaveMe\n---\nb:\n  c: 2\nfield: deleteMe\n\n\n\n\nthen\n\n\nyq w -d1 sample.yaml field\n\n\n\n\nwill output:\n\n\nsomething: else\nfield: leaveMe\n---\nb:\n  c: 2\n\n\n\n\nMultiple Documents - delete from all documents\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nsomething: else\nfield: deleteMe\n---\nb:\n  c: 2\nfield: deleteMeToo\n\n\n\n\nthen\n\n\nyq w -d'*' sample.yaml field\n\n\n\n\nwill output:\n\n\nsomething: else\n---\nb:\n  c: 2\n\n\n\n\nNote that '*' is in quotes to avoid being interpreted by your shell.\n\n\nKeys with dots\n\u00b6\n\n\nWhen specifying a key that has a dot use key lookup indicator.\n\n\nb:\n  foo.bar: 7\n\n\n\n\nyaml r sample.yaml 'b[foo.bar]'\n\n\n\n\nyaml w sample.yaml 'b[foo.bar]' 9\n\n\n\n\nAny valid yaml key can be specified as part of a key lookup.\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.",
             "title": "Delete"
         },
         {
@@ -120,6 +135,16 @@
             "text": "Given a sample.yaml file of:  b:\n  c: 2\n  apples: green  then  yq d -i sample.yaml b.c  will update the sample.yaml file so that the 'c' node is deleted",
             "title": "Deleting nodes in-place"
         },
+        {
+            "location": "/delete/#multiple-documents-delete-from-single-document",
+            "text": "Given a sample.yaml file of:  something: else\nfield: leaveMe\n---\nb:\n  c: 2\nfield: deleteMe  then  yq w -d1 sample.yaml field  will output:  something: else\nfield: leaveMe\n---\nb:\n  c: 2",
+            "title": "Multiple Documents - delete from single document"
+        },
+        {
+            "location": "/delete/#multiple-documents-delete-from-all-documents",
+            "text": "Given a sample.yaml file of:  something: else\nfield: deleteMe\n---\nb:\n  c: 2\nfield: deleteMeToo  then  yq w -d'*' sample.yaml field  will output:  something: else\n---\nb:\n  c: 2  Note that '*' is in quotes to avoid being interpreted by your shell.",
+            "title": "Multiple Documents - delete from all documents"
+        },
         {
             "location": "/delete/#keys-with-dots",
             "text": "When specifying a key that has a dot use key lookup indicator.  b:\n  foo.bar: 7  yaml r sample.yaml 'b[foo.bar]'  yaml w sample.yaml 'b[foo.bar]' 9  Any valid yaml key can be specified as part of a key lookup.  Note that the path is in quotes to avoid the square brackets being interpreted by your shell.",
@@ -127,7 +152,7 @@
         },
         {
             "location": "/create/",
-            "text": "Yaml files can be created using the 'new' command. This works in the same way as the write command, but you don't pass in an existing Yaml file.\n\n\nyq n <path> <new value>\n\n\n\n\nCreating a simple yaml file\n\u00b6\n\n\nyq n b.c cat\n\n\n\n\nwill output:\n\n\nb:\n  c: cat\n\n\n\n\nCreating using a create script\n\u00b6\n\n\nCreate scripts follow the same format as the update scripts.\n\n\nGiven a script create_instructions.yaml of:\n\n\nb.c: 3\nb.e[0].name: Howdy Partner\n\n\n\n\nthen\n\n\nyq n -s create_instructions.yaml\n\n\n\n\nwill output:\n\n\nb:\n  c: 3\n  e:\n    - name: Howdy Partner\n\n\n\n\nYou can also pipe the instructions in:\n\n\ncat create_instructions.yaml | yq n -s -\n\n\n\n\nKeys with dots\n\u00b6\n\n\nWhen specifying a key that has a dot use key lookup indicator.\n\n\nb:\n  foo.bar: 7\n\n\n\n\nyaml r sample.yaml 'b[foo.bar]'\n\n\n\n\nyaml w sample.yaml 'b[foo.bar]' 9\n\n\n\n\nAny valid yaml key can be specified as part of a key lookup.\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.",
+            "text": "Yaml files can be created using the 'new' command. This works in the same way as the write command, but you don't pass in an existing Yaml file. Currently this does not support creating multiple documents in a single yaml file.\n\n\nyq n <path> <new value>\n\n\n\n\nCreating a simple yaml file\n\u00b6\n\n\nyq n b.c cat\n\n\n\n\nwill output:\n\n\nb:\n  c: cat\n\n\n\n\nCreating using a create script\n\u00b6\n\n\nCreate scripts follow the same format as the update scripts.\n\n\nGiven a script create_instructions.yaml of:\n\n\nb.c: 3\nb.e[0].name: Howdy Partner\n\n\n\n\nthen\n\n\nyq n -s create_instructions.yaml\n\n\n\n\nwill output:\n\n\nb:\n  c: 3\n  e:\n    - name: Howdy Partner\n\n\n\n\nYou can also pipe the instructions in:\n\n\ncat create_instructions.yaml | yq n -s -\n\n\n\n\nKeys with dots\n\u00b6\n\n\nWhen specifying a key that has a dot use key lookup indicator.\n\n\nb:\n  foo.bar: 7\n\n\n\n\nyaml r sample.yaml 'b[foo.bar]'\n\n\n\n\nyaml w sample.yaml 'b[foo.bar]' 9\n\n\n\n\nAny valid yaml key can be specified as part of a key lookup.\n\n\nNote that the path is in quotes to avoid the square brackets being interpreted by your shell.",
             "title": "Create"
         },
         {
@@ -147,12 +172,12 @@
         },
         {
             "location": "/convert/",
-            "text": "Yaml to Json\n\u00b6\n\n\nTo convert output to json, use the --tojson (or -j) flag. This can be used with any command.\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq r -j sample.yaml b.c\n\n\n\n\nwill output\n\n\n{\"b\":{\"c\":2}}\n\n\n\n\nJson to Yaml\n\u00b6\n\n\nTo read in json, just pass in a json file instead of yaml, it will just work :)\n\n\ne.g given a json file\n\n\n{\"a\":\"Easy! as one two three\",\"b\":{\"c\":2,\"d\":[3,4]}}\n\n\n\n\nthen\n\n\nyq r sample.json\n\n\n\n\nwill output\n\n\na: Easy! as one two three\nb:\n  c: 2\n  d:\n  - 3\n  - 4",
+            "text": "Yaml to Json\n\u00b6\n\n\nTo convert output to json, use the --tojson (or -j) flag. This can only be used with the read command.\n\n\nGiven a sample.yaml file of:\n\n\nb:\n  c: 2\n\n\n\n\nthen\n\n\nyq r -j sample.yaml b.c\n\n\n\n\nwill output\n\n\n{\"b\":{\"c\":2}}\n\n\n\n\nJson to Yaml\n\u00b6\n\n\nTo read in json, just pass in a json file instead of yaml, it will just work :)\n\n\ne.g given a json file\n\n\n{\"a\":\"Easy! as one two three\",\"b\":{\"c\":2,\"d\":[3,4]}}\n\n\n\n\nthen\n\n\nyq r sample.json\n\n\n\n\nwill output\n\n\na: Easy! as one two three\nb:\n  c: 2\n  d:\n  - 3\n  - 4",
             "title": "Convert"
         },
         {
             "location": "/convert/#yaml-to-json",
-            "text": "To convert output to json, use the --tojson (or -j) flag. This can be used with any command.  Given a sample.yaml file of:  b:\n  c: 2  then  yq r -j sample.yaml b.c  will output  {\"b\":{\"c\":2}}",
+            "text": "To convert output to json, use the --tojson (or -j) flag. This can only be used with the read command.  Given a sample.yaml file of:  b:\n  c: 2  then  yq r -j sample.yaml b.c  will output  {\"b\":{\"c\":2}}",
             "title": "Yaml to Json"
         },
         {
@@ -162,7 +187,7 @@
         },
         {
             "location": "/merge/",
-            "text": "Yaml files can be merged using the 'merge' command. Each additional file merged with the first file will\nset values for any key not existing already or where the key has no value.\n\n\nyq m <yaml_file|json_file> <path>...\n\n\n\n\nThis command can take a json file as input too, and will output yaml unless specified to export as json (-j)\n\n\nTo Stdout\n\u00b6\n\n\nGiven a data1.yaml file of:\n\n\na: simple\nb: [1, 2]\n\n\n\n\nand data2.yaml file of:\n\n\na: other\nc:\n  test: 1\n\n\n\n\nthen\n\n\nyq m data1.yaml data2.yaml\n\n\n\n\nwill output:\n\n\na: simple\nb: [1, 2]\nc:\n  test: 1\n\n\n\n\nUpdating files in-place\n\u00b6\n\n\nGiven a data1.yaml file of:\n\n\na: simple\nb: [1, 2]\n\n\n\n\nand data2.yaml file of:\n\n\na: other\nc:\n  test: 1\n\n\n\n\nthen\n\n\nyq m -i data1.yaml data2.yaml\n\n\n\n\nwill update the data1.yaml file so that the value of 'c' is 'test: 1'.\n\n\nOverwrite values\n\u00b6\n\n\nGiven a data1.yaml file of:\n\n\na: simple\nb: [1, 2]\n\n\n\n\nand data2.yaml file of:\n\n\na: other\nc:\n  test: 1\n\n\n\n\nthen\n\n\nyq m -x data1.yaml data2.yaml\n\n\n\n\nwill output:\n\n\na: other\nb: [1, 2]\nc:\n  test: 1\n\n\n\n\nOverwrite values with arrays\n\u00b6\n\n\nGiven a data1.yaml file of:\n\n\na: simple\nb: [1, 2]\n\n\n\n\nand data3.yaml file of:\n\n\nb: [2, 3, 4]\nc:\n  test: 2\n  other: true\nd: false\n\n\n\n\nthen\n\n\nyq m -x data1.yaml data3.yaml\n\n\n\n\nwill output:\n\n\na: simple\nb: [2, 3, 4]\nc:\n  test: 2\n  other: true\nd: false\n\n\n\n\nNotice that 'b' does not result in the merging of the values within an array. The underlying library does not\ncurrently handle merging values within an array.",
+            "text": "Yaml files can be merged using the 'merge' command. Each additional file merged with the first file will\nset values for any key not existing already or where the key has no value.\n\n\nyq m <yaml_file> <path>...\n\n\n\n\nTo Stdout\n\u00b6\n\n\nGiven a data1.yaml file of:\n\n\na: simple\nb: [1, 2]\n\n\n\n\nand data2.yaml file of:\n\n\na: other\nc:\n  test: 1\n\n\n\n\nthen\n\n\nyq m data1.yaml data2.yaml\n\n\n\n\nwill output:\n\n\na: simple\nb: [1, 2]\nc:\n  test: 1\n\n\n\n\nUpdating files in-place\n\u00b6\n\n\nGiven a data1.yaml file of:\n\n\na: simple\nb: [1, 2]\n\n\n\n\nand data2.yaml file of:\n\n\na: other\nc:\n  test: 1\n\n\n\n\nthen\n\n\nyq m -i data1.yaml data2.yaml\n\n\n\n\nwill update the data1.yaml file so that the value of 'c' is 'test: 1'.\n\n\nOverwrite values\n\u00b6\n\n\nGiven a data1.yaml file of:\n\n\na: simple\nb: [1, 2]\n\n\n\n\nand data2.yaml file of:\n\n\na: other\nc:\n  test: 1\n\n\n\n\nthen\n\n\nyq m -x data1.yaml data2.yaml\n\n\n\n\nwill output:\n\n\na: other\nb: [1, 2]\nc:\n  test: 1\n\n\n\n\nOverwrite values with arrays\n\u00b6\n\n\nGiven a data1.yaml file of:\n\n\na: simple\nb: [1, 2]\n\n\n\n\nand data3.yaml file of:\n\n\nb: [2, 3, 4]\nc:\n  test: 2\n  other: true\nd: false\n\n\n\n\nthen\n\n\nyq m -x data1.yaml data3.yaml\n\n\n\n\nwill output:\n\n\na: simple\nb: [2, 3, 4]\nc:\n  test: 2\n  other: true\nd: false\n\n\n\n\nNotice that 'b' does not result in the merging of the values within an array. The underlying library does not\ncurrently handle merging values within an array.\n\n\nMultiple Documents - merge into single document\n\u00b6\n\n\nCurrently yq only has multi-document support for the \nfirst\n document being merged into. The remaining yaml files will have their first document selected.\n\n\nGiven a data1.yaml file of:\n\n\nsomething: else\n---\na: simple\nb: cat\n\n\n\n\nand data3.yaml file of:\n\n\nb: dog\n\n\n\n\nthen\n\n\nyq m -x -d1 data1.yaml data3.yaml\n\n\n\n\nwill output:\n\n\nsomething: else\n---\na: simple\nb: dog\n\n\n\n\nMultiple Documents - merge into all documents\n\u00b6\n\n\nCurrently yq only has multi-document support for the \nfirst\n document being merged into. The remaining yaml files will have their first document selected.\n\n\nGiven a data1.yaml file of:\n\n\nsomething: else\n---\na: simple\nb: cat\n\n\n\n\nand data3.yaml file of:\n\n\nb: dog\n\n\n\n\nthen\n\n\nyq m -x -d'*' data1.yaml data3.yaml\n\n\n\n\nwill output:\n\n\nb: dog\nsomething: else\n---\na: simple\nb: dog",
             "title": "Merge"
         },
         {
@@ -184,6 +209,16 @@
             "location": "/merge/#overwrite-values-with-arrays",
             "text": "Given a data1.yaml file of:  a: simple\nb: [1, 2]  and data3.yaml file of:  b: [2, 3, 4]\nc:\n  test: 2\n  other: true\nd: false  then  yq m -x data1.yaml data3.yaml  will output:  a: simple\nb: [2, 3, 4]\nc:\n  test: 2\n  other: true\nd: false  Notice that 'b' does not result in the merging of the values within an array. The underlying library does not\ncurrently handle merging values within an array.",
             "title": "Overwrite values with arrays"
+        },
+        {
+            "location": "/merge/#multiple-documents-merge-into-single-document",
+            "text": "Currently yq only has multi-document support for the  first  document being merged into. The remaining yaml files will have their first document selected.  Given a data1.yaml file of:  something: else\n---\na: simple\nb: cat  and data3.yaml file of:  b: dog  then  yq m -x -d1 data1.yaml data3.yaml  will output:  something: else\n---\na: simple\nb: dog",
+            "title": "Multiple Documents - merge into single document"
+        },
+        {
+            "location": "/merge/#multiple-documents-merge-into-all-documents",
+            "text": "Currently yq only has multi-document support for the  first  document being merged into. The remaining yaml files will have their first document selected.  Given a data1.yaml file of:  something: else\n---\na: simple\nb: cat  and data3.yaml file of:  b: dog  then  yq m -x -d'*' data1.yaml data3.yaml  will output:  b: dog\nsomething: else\n---\na: simple\nb: dog",
+            "title": "Multiple Documents - merge into all documents"
         }
     ]
 }

docs/sitemap.xml

@@ -4,7 +4,7 @@
     
     <url>
      <loc>/</loc>
-     <lastmod>2018-05-07</lastmod>
+     <lastmod>2018-06-20</lastmod>
      <changefreq>daily</changefreq>
     </url>
     
@@ -12,7 +12,7 @@
     
     <url>
      <loc>/read/</loc>
-     <lastmod>2018-05-07</lastmod>
+     <lastmod>2018-06-20</lastmod>
      <changefreq>daily</changefreq>
     </url>
     
@@ -20,7 +20,7 @@
     
     <url>
      <loc>/write/</loc>
-     <lastmod>2018-05-07</lastmod>
+     <lastmod>2018-06-20</lastmod>
      <changefreq>daily</changefreq>
     </url>
     
@@ -28,7 +28,7 @@
     
     <url>
      <loc>/delete/</loc>
-     <lastmod>2018-05-07</lastmod>
+     <lastmod>2018-06-20</lastmod>
      <changefreq>daily</changefreq>
     </url>
     
@@ -36,7 +36,7 @@
     
     <url>
      <loc>/create/</loc>
-     <lastmod>2018-05-07</lastmod>
+     <lastmod>2018-06-20</lastmod>
      <changefreq>daily</changefreq>
     </url>
     
@@ -44,7 +44,7 @@
     
     <url>
      <loc>/convert/</loc>
-     <lastmod>2018-05-07</lastmod>
+     <lastmod>2018-06-20</lastmod>
      <changefreq>daily</changefreq>
     </url>
     
@@ -52,7 +52,7 @@
     
     <url>
      <loc>/merge/</loc>
-     <lastmod>2018-05-07</lastmod>
+     <lastmod>2018-06-20</lastmod>
      <changefreq>daily</changefreq>
     </url>
     

docs/write/index.html

@@ -275,6 +275,20 @@
     Appending value to an array field
   </a>
   
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents-update-a-single-document" title="Multiple Documents - update a single document" class="md-nav__link">
+    Multiple Documents - update a single document
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents-update-all-documents" title="Multiple Documents - update all documents" class="md-nav__link">
+    Multiple Documents - update all documents
+  </a>
+  
 </li>
       
         <li class="md-nav__item">
@@ -406,6 +420,20 @@
     Appending value to an array field
   </a>
   
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents-update-a-single-document" title="Multiple Documents - update a single document" class="md-nav__link">
+    Multiple Documents - update a single document
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multiple-documents-update-all-documents" title="Multiple Documents - update all documents" class="md-nav__link">
+    Multiple Documents - update all documents
+  </a>
+  
 </li>
       
         <li class="md-nav__item">
@@ -455,10 +483,9 @@
                 
                   <h1>Write/Update</h1>
                 
-                <pre><code>yq w &lt;yaml_file|json_file&gt; &lt;path&gt; &lt;new value&gt;
+                <pre><code>yq w &lt;yaml_file&gt; &lt;path&gt; &lt;new value&gt;
 </code></pre>
 
-<p>This command can take a json file as input too, and will output yaml unless specified to export as json (-j)</p>
 <h3 id="to-stdout">To Stdout<a class="headerlink" href="#to-stdout" title="Permanent link">&para;</a></h3>
 <p>Given a sample.yaml file of:</p>
 <pre><code class="yaml">b:
@@ -519,6 +546,47 @@
 </code></pre>
 
 <p>Note that the path is in quotes to avoid the square brackets being interpreted by your shell.</p>
+<h3 id="multiple-documents-update-a-single-document">Multiple Documents - update a single document<a class="headerlink" href="#multiple-documents-update-a-single-document" title="Permanent link">&para;</a></h3>
+<p>Given a sample.yaml file of:</p>
+<pre><code class="yaml">something: else
+---
+b:
+  c: 2
+</code></pre>
+
+<p>then</p>
+<pre><code class="bash">yq w -d1 sample.yaml b.c 5
+</code></pre>
+
+<p>will output:</p>
+<pre><code class="yaml">something: else
+---
+b:
+  c: 5
+</code></pre>
+
+<h3 id="multiple-documents-update-all-documents">Multiple Documents - update all documents<a class="headerlink" href="#multiple-documents-update-all-documents" title="Permanent link">&para;</a></h3>
+<p>Given a sample.yaml file of:</p>
+<pre><code class="yaml">something: else
+---
+b:
+  c: 2
+</code></pre>
+
+<p>then</p>
+<pre><code class="bash">yq w -d'*' sample.yaml b.c 5
+</code></pre>
+
+<p>will output:</p>
+<pre><code class="yaml">something: else
+b:
+  c: 5
+---
+b:
+  c: 5
+</code></pre>
+
+<p>Note that '*' is in quotes to avoid being interpreted by your shell.</p>
 <h3 id="updating-files-in-place">Updating files in-place<a class="headerlink" href="#updating-files-in-place" title="Permanent link">&para;</a></h3>
 <p>Given a sample.yaml file of:</p>
 <pre><code class="yaml">b:

examples/data3.yaml

@@ -1,5 +1 @@
-b: [2, 3, 4]
-c:
-  test: 2
-  other: true
-d: false
+b: dog

examples/multiple_docs.yaml

@@ -0,0 +1,22 @@
+commonKey: first document
+a: Easy! as one two three
+b:
+  c: 2
+  d: [3, 4]
+  e:
+    - name: fred
+      value: 3
+    - name: sam
+      value: 4
+---
+commonKey: second document
+another:
+  document: here
+---
+commonKey: third document
+wow: 
+  - here is another
+---
+- 1
+- 2
+- 3 

examples/multiple_docs_small.yaml

@@ -0,0 +1,7 @@
+a: Easy! as one two three
+---
+another:
+  document: here
+---
+- 1
+- 2

examples/sample.yaml

@@ -6,4 +6,4 @@ b:
     - name: fred
       value: 3
     - name: sam
-      value: 4
+      value: 4

json_converter.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"strconv"
 
-	yaml "gopkg.in/yaml.v2"
+	yaml "gopkg.in/mikefarah/yaml.v2"
 )
 
 func jsonToString(context interface{}) (string, error) {

merge.go

@@ -1,8 +1,6 @@
 package main
 
-import (
-	"github.com/imdario/mergo"
-)
+import "gopkg.in/imdario/mergo.v0"
 
 func merge(dst, src interface{}, overwrite bool) error {
 	if overwrite {

merge_test.go

@@ -1,30 +0,0 @@
-package main
-
-import (
-	"testing"
-
-	yaml "gopkg.in/yaml.v2"
-)
-
-func TestMerge(t *testing.T) {
-	result, _ := mergeYaml([]string{"examples/data1.yaml", "examples/data2.yaml", "examples/data3.yaml"})
-	expected := yaml.MapSlice{
-		yaml.MapItem{Key: "a", Value: "simple"},
-		yaml.MapItem{Key: "b", Value: []interface{}{1, 2}},
-		yaml.MapItem{Key: "c", Value: yaml.MapSlice{yaml.MapItem{Key: "other", Value: true}, yaml.MapItem{Key: "test", Value: 1}}},
-		yaml.MapItem{Key: "d", Value: false},
-	}
-	assertResultComplex(t, expected, result)
-}
-
-func TestMergeWithOverwrite(t *testing.T) {
-	overwriteFlag = true
-	result, _ := mergeYaml([]string{"examples/data1.yaml", "examples/data2.yaml", "examples/data3.yaml"})
-	expected := yaml.MapSlice{
-		yaml.MapItem{Key: "a", Value: "other"},
-		yaml.MapItem{Key: "b", Value: []interface{}{2, 3, 4}},
-		yaml.MapItem{Key: "c", Value: yaml.MapSlice{yaml.MapItem{Key: "other", Value: true}, yaml.MapItem{Key: "test", Value: 2}}},
-		yaml.MapItem{Key: "d", Value: false},
-	}
-	assertResultComplex(t, expected, result)
-}

mkdocs/convert.md

@@ -1,5 +1,5 @@
 ### Yaml to Json
-To convert output to json, use the --tojson (or -j) flag. This can be used with any command.
+To convert output to json, use the --tojson (or -j) flag. This can only be used with the read command.
 
 Given a sample.yaml file of:
 ```yaml

mkdocs/create.md

@@ -1,4 +1,4 @@
-Yaml files can be created using the 'new' command. This works in the same way as the write command, but you don't pass in an existing Yaml file.
+Yaml files can be created using the 'new' command. This works in the same way as the write command, but you don't pass in an existing Yaml file. Currently this does not support creating multiple documents in a single yaml file.
 
 ```
 yq n <path> <new value>

mkdocs/delete.md

@@ -1,7 +1,6 @@
 ```
-yq d <yaml_file|json_file> <path_to_delete>
+yq d <yaml_file> <path_to_delete>
 ```
-{!snippets/works_with_json.md!}
 
 ### To Stdout
 Given a sample.yaml file of:
@@ -60,4 +59,52 @@ yq d -i sample.yaml b.c
 will update the sample.yaml file so that the 'c' node is deleted
 
 
+
+### Multiple Documents - delete from single document
+Given a sample.yaml file of:
+```yaml
+something: else
+field: leaveMe
+---
+b:
+  c: 2
+field: deleteMe
+```
+then
+```bash
+yq w -d1 sample.yaml field
+```
+will output:
+```yaml
+something: else
+field: leaveMe
+---
+b:
+  c: 2
+```
+
+### Multiple Documents - delete from all documents
+Given a sample.yaml file of:
+```yaml
+something: else
+field: deleteMe
+---
+b:
+  c: 2
+field: deleteMeToo
+```
+then
+```bash
+yq w -d'*' sample.yaml field
+```
+will output:
+```yaml
+something: else
+---
+b:
+  c: 2
+```
+
+Note that '*' is in quotes to avoid being interpreted by your shell.
+
 {!snippets/keys_with_dots.md!}

mkdocs/index.md

@@ -12,9 +12,15 @@ On Ubuntu and other Linux distros supporting `snap` packages:
 ```
 snap install yq
 ```
+On Ubuntu 16.04 or higher from Debian package:
+```
+sudo add-apt-repository ppa:rmescandon/yq
+sudo apt update
+sudo apt install yq -y
+```
 or, [Download latest binary](https://github.com/mikefarah/yq/releases/latest) or alternatively:
 ```
-go get github.com/mikefarah/yq
+go get gopkg.in/mikefarah/yq.v2
 ```
 
 [View on GitHub](https://github.com/mikefarah/yq)

mkdocs/merge.md

@@ -2,9 +2,9 @@ Yaml files can be merged using the 'merge' command. Each additional file merged
 set values for any key not existing already or where the key has no value.
 
 ```
-yq m <yaml_file|json_file> <path>...
+yq m <yaml_file> <path>...
 ```
-{!snippets/works_with_json.md!}
+
 
 ### To Stdout
 Given a data1.yaml file of:
@@ -102,3 +102,56 @@ d: false
 
 Notice that 'b' does not result in the merging of the values within an array. The underlying library does not
 currently handle merging values within an array.
+
+### Multiple Documents - merge into single document
+Currently yq only has multi-document support for the _first_ document being merged into. The remaining yaml files will have their first document selected.
+
+Given a data1.yaml file of:
+```yaml
+something: else
+---
+a: simple
+b: cat
+```
+and data3.yaml file of:
+```yaml
+b: dog
+```
+then
+```bash
+yq m -x -d1 data1.yaml data3.yaml
+```
+will output:
+```yaml
+something: else
+---
+a: simple
+b: dog
+```
+
+### Multiple Documents - merge into all documents
+Currently yq only has multi-document support for the _first_ document being merged into. The remaining yaml files will have their first document selected.
+
+Given a data1.yaml file of:
+```yaml
+something: else
+---
+a: simple
+b: cat
+```
+and data3.yaml file of:
+```yaml
+b: dog
+```
+then
+```bash
+yq m -x -d'*' data1.yaml data3.yaml
+```
+will output:
+```yaml
+b: dog
+something: else
+---
+a: simple
+b: dog
+```

mkdocs/read.md

@@ -43,6 +43,20 @@ will output
 - apples
 ```
 
+### Multiple Documents
+Given a sample.yaml file of:
+```yaml
+something: else
+---
+b:
+  c: 2
+```
+then
+```bash
+yq r -d1 sample.yaml b.c
+```
+will output the value of '2'.
+
 ### Arrays
 You can give an index to access a specific element:
 e.g.: given a sample file of

mkdocs/write.md

@@ -1,7 +1,6 @@
 ```
-yq w <yaml_file|json_file> <path> <new value>
+yq w <yaml_file> <path> <new value>
 ```
-{!snippets/works_with_json.md!}
 
 ### To Stdout
 Given a sample.yaml file of:
@@ -69,6 +68,50 @@ b:
 
 Note that the path is in quotes to avoid the square brackets being interpreted by your shell.
 
+### Multiple Documents - update a single document
+Given a sample.yaml file of:
+```yaml
+something: else
+---
+b:
+  c: 2
+```
+then
+```bash
+yq w -d1 sample.yaml b.c 5
+```
+will output:
+```yaml
+something: else
+---
+b:
+  c: 5
+```
+
+### Multiple Documents - update all documents
+Given a sample.yaml file of:
+```yaml
+something: else
+---
+b:
+  c: 2
+```
+then
+```bash
+yq w -d'*' sample.yaml b.c 5
+```
+will output:
+```yaml
+something: else
+b:
+  c: 5
+---
+b:
+  c: 5
+```
+
+Note that '*' is in quotes to avoid being interpreted by your shell.
+
 ### Updating files in-place
 Given a sample.yaml file of:
 ```yaml

release_instructions.txt

@@ -0,0 +1,37 @@
+- increment version in version.go
+- increment version in snapcraft.yaml
+- tag git with same version number
+- make sure local build passes
+- push tag to git
+- make local xcompile (builds binaries for all platforms)
+
+- git release
+  ./scripts/publish.sh
+
+- snapcraft
+  - will auto create a candidate, test it works then promote
+  - see https://build.snapcraft.io/user/mikefarah/yq
+  
+  sudo snap remove yq
+  sudo snap install --edge yq
+  
+  then on the mac snapcraft release yq <snap_build_number> stable
+
+
+- brew
+  - create pull request pointing to latest git release
+
+- docker
+  - build and push latest and new version tag
+
+- debian package
+  - execute 
+    ```dch -i```
+  - fill debian/changelog with changes from last version
+  - build the package sources 
+    ```debuild -i -I -S -sa```
+    (signing with gpg key is required in order to put it to ppa)
+  - put to PPA
+    ```dput ppa:<REPOSITORY> ../yq_<VERSION>_source.changes```
+    (current distro repository is ppa:rmescandon/yq. In case that a new version
+    is released, please contact rmescandon@gmail.com to bump debian package)

scripts/publish.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-
+set -ex
 GITHUB_TOKEN="${GITHUB_TOKEN:?missing required input \'GITHUB_TOKEN\'}"
 
 CURRENT="$(git describe --tags --abbrev=0)"
@@ -8,32 +8,25 @@ OWNER="mikefarah"
 REPO="yq"
 
 release() {
-    mapfile -t logs < <(git log --pretty=oneline --abbrev-commit "${PREVIOUS}".."${CURRENT}")
-    description="$(printf '%s\n' "${logs[@]}")"
     github-release release \
         --user "$OWNER" \
         --repo "$REPO" \
-        --tag "$CURRENT" \
-        --description "$description" ||
-            github-release edit \
-                --user "$OWNER" \
-                --repo "$REPO" \
-                --tag "$CURRENT" \
-                --description "$description"
+        --tag "$CURRENT"
 }
 
 upload() {
-    mapfile -t files < <(find ./build -mindepth 1 -maxdepth 1)
-    for file in "${files[@]}"; do
+    while IFS=  read -r -d $'\0'; do
+        file=$REPLY
         BINARY=$(basename "${file}")
         echo "--> ${BINARY}"
         github-release upload \
+            --replace \
             --user "$OWNER" \
             --repo "$REPO" \
             --tag "$CURRENT" \
             --name "${BINARY}" \
             --file "$file"
-    done
+    done < <(find ./build -mindepth 1 -maxdepth 1 -print0)
 }
 
 release

snap/snapcraft.yaml

@@ -1,5 +1,5 @@
 name: yq
-version: 1.14.1
+version: 2.0.0
 summary: A lightweight and portable command-line YAML processor
 description: |
   The aim of the project is to be the jq or sed of yaml files.

utils_test.go

@@ -9,8 +9,8 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/spf13/cobra"
-	yaml "gopkg.in/yaml.v2"
+	yaml "gopkg.in/mikefarah/yaml.v2"
+	"gopkg.in/spf13/cobra.v0"
 )
 
 type resulter struct {

vendor/vendor.json

@@ -2,12 +2,6 @@
 	"comment": "",
 	"ignore": "test",
 	"package": [
-		{
-			"checksumSHA1": "66lykxpWgSmQodnhkADqn6tnroQ=",
-			"path": "github.com/imdario/mergo",
-			"revision": "e3000cb3d28c72b837601cac94debd91032d19fe",
-			"revisionTime": "2017-06-20T10:47:01Z"
-		},
 		{
 			"checksumSHA1": "40vJyUB4ezQSn/NSadsKEOrudMc=",
 			"path": "github.com/inconshreveable/mousetrap",
@@ -15,28 +9,40 @@
 			"revisionTime": "2014-10-17T20:07:13Z"
 		},
 		{
-			"checksumSHA1": "BoXdUBWB8UnSlFlbnuTQaPqfCGk=",
-			"path": "github.com/op/go-logging",
-			"revision": "970db520ece77730c7e4724c61121037378659d9",
-			"revisionTime": "2016-03-15T20:05:05Z"
+			"checksumSHA1": "ljd3FhYRJ91cLZz3wsH9BQQ2JbA=",
+			"path": "github.com/pkg/errors",
+			"revision": "816c9085562cd7ee03e7f8188a1cfd942858cded",
+			"revisionTime": "2018-03-11T21:45:15Z"
 		},
 		{
-			"checksumSHA1": "xPKgXygsORkmXnLdtFaFmipYKaA=",
-			"path": "github.com/spf13/cobra",
-			"revision": "b78744579491c1ceeaaa3b40205e56b0591b93a3",
-			"revisionTime": "2017-09-05T17:20:51Z"
-		},
-		{
-			"checksumSHA1": "Q52Y7t0lEtk/wcDn5q7tS7B+jqs=",
+			"checksumSHA1": "OJI0OgC5V8gZtfS1e0CDYMhkDNc=",
 			"path": "github.com/spf13/pflag",
-			"revision": "7aff26db30c1be810f9de5038ec5ef96ac41fd7c",
-			"revisionTime": "2017-08-24T17:57:12Z"
+			"revision": "3ebe029320b2676d667ae88da602a5f854788a8a",
+			"revisionTime": "2018-06-01T13:25:42Z"
 		},
 		{
-			"checksumSHA1": "RDJpJQwkF012L6m/2BJizyOksNw=",
-			"path": "gopkg.in/yaml.v2",
-			"revision": "eb3733d160e74a9c7e442f435eb3bea458e1d19f",
-			"revisionTime": "2017-08-12T16:00:11Z"
+			"checksumSHA1": "RwlkCZz8VFXAE4aHQQOSC0hLu5k=",
+			"path": "gopkg.in/imdario/mergo.v0",
+			"revision": "9316a62528ac99aaecb4e47eadd6dc8aa6533d58",
+			"revisionTime": "2018-06-08T14:01:56Z"
+		},
+		{
+			"checksumSHA1": "7wtGubs4v7+RZovtlmyT9KwA/gE=",
+			"path": "gopkg.in/mikefarah/yaml.v2",
+			"revision": "e175af14aaa1d0eff2ee04b691e4a4827a111416",
+			"revisionTime": "2018-06-13T04:05:11Z"
+		},
+		{
+			"checksumSHA1": "rL5r44ASTGubGW88gqQwlvVQshw=",
+			"path": "gopkg.in/op/go-logging.v1",
+			"revision": "b2cb9fa56473e98db8caba80237377e83fe44db5",
+			"revisionTime": "2016-02-11T21:21:56Z"
+		},
+		{
+			"checksumSHA1": "xsZjAbfLrXcMtY6fyQ8QC6EvJD0=",
+			"path": "gopkg.in/spf13/cobra.v0",
+			"revision": "ef82de70bb3f60c65fb8eebacbb2d122ef517385",
+			"revisionTime": "2018-04-27T13:45:50Z"
 		}
 	],
 	"rootPath": "github.com/mikefarah/yq"

version.go

@@ -11,7 +11,7 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "1.15.0"
+	Version = "2.0.1"
 
 	// VersionPrerelease is a pre-release marker for the version. If this is "" (empty string)
 	// then it means that it is a final release. Otherwise, this is a pre-release

version_test.go

@@ -3,13 +3,18 @@ package main
 import "testing"
 
 func TestGetVersionDisplay(t *testing.T) {
+	var expectedVersion = ProductName + " version " + Version
+	if VersionPrerelease != "" {
+		expectedVersion = expectedVersion + "-" + VersionPrerelease
+	}
+	expectedVersion = expectedVersion + "\n"
 	tests := []struct {
 		name string
 		want string
 	}{
 		{
 			name: "Display Version",
-			want: ProductName + " version " + Version + "\n",
+			want: expectedVersion,
 		},
 	}
 	for _, tt := range tests {

yq.go

@@ -1,16 +1,20 @@
 package main
 
 import (
-	"errors"
+	"bufio"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
+	"reflect"
 	"strconv"
 	"strings"
 
-	logging "github.com/op/go-logging"
-	"github.com/spf13/cobra"
-	yaml "gopkg.in/yaml.v2"
+	errors "github.com/pkg/errors"
+	"gopkg.in/spf13/cobra.v0"
+
+	yaml "gopkg.in/mikefarah/yaml.v2"
+	logging "gopkg.in/op/go-logging.v1"
 )
 
 var trimOutput = true
@@ -20,17 +24,19 @@ var outputToJSON = false
 var overwriteFlag = false
 var verbose = false
 var version = false
+var docIndex = "0"
 var log = logging.MustGetLogger("yq")
 
 func main() {
 	cmd := newCommandCLI()
 	if err := cmd.Execute(); err != nil {
-		fmt.Println(err.Error())
+		log.Error(err.Error())
 		os.Exit(1)
 	}
 }
 
 func newCommandCLI() *cobra.Command {
+	yaml.DefaultMapType = reflect.TypeOf(yaml.MapSlice{})
 	var rootCmd = &cobra.Command{
 		Use: "yq",
 		RunE: func(cmd *cobra.Command, args []string) error {
@@ -60,7 +66,6 @@ func newCommandCLI() *cobra.Command {
 	}
 
 	rootCmd.PersistentFlags().BoolVarP(&trimOutput, "trim", "t", true, "trim yaml output")
-	rootCmd.PersistentFlags().BoolVarP(&outputToJSON, "tojson", "j", false, "output as json")
 	rootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "verbose mode")
 	rootCmd.Flags().BoolVarP(&version, "version", "V", false, "Print version information and quit")
 
@@ -77,35 +82,38 @@ func newCommandCLI() *cobra.Command {
 }
 
 func createReadCmd() *cobra.Command {
-	return &cobra.Command{
+	var cmdRead = &cobra.Command{
 		Use:     "read [yaml_file] [path]",
 		Aliases: []string{"r"},
-		Short:   "yq r sample.yaml a.b.c",
+		Short:   "yq r [--doc/-d index] sample.yaml a.b.c",
 		Example: `
 yq read things.yaml a.b.c
 yq r - a.b.c (reads from stdin)
 yq r things.yaml a.*.c
-yq r things.yaml a.array[0].blah
+yq r -d1 things.yaml a.array[0].blah
 yq r things.yaml a.array[*].blah
       `,
 		Long: "Outputs the value of the given path in the yaml file to STDOUT",
 		RunE: readProperty,
 	}
+	cmdRead.PersistentFlags().StringVarP(&docIndex, "doc", "d", "0", "process document index number, 0 based")
+	cmdRead.PersistentFlags().BoolVarP(&outputToJSON, "tojson", "j", false, "output as json")
+	return cmdRead
 }
 
 func createWriteCmd() *cobra.Command {
 	var cmdWrite = &cobra.Command{
 		Use:     "write [yaml_file] [path] [value]",
 		Aliases: []string{"w"},
-		Short:   "yq w [--inplace/-i] [--script/-s script_file] sample.yaml a.b.c newValueForC",
+		Short:   "yq w [--inplace/-i] [--script/-s script_file] [--doc/-d index] sample.yaml a.b.c newValue",
 		Example: `
 yq write things.yaml a.b.c cat
 yq write --inplace things.yaml a.b.c cat
 yq w -i things.yaml a.b.c cat
 yq w --script update_script.yaml things.yaml
 yq w -i -s update_script.yaml things.yaml
-yq w things.yaml a.b.d[+] foo
-yq w things.yaml a.b.d[+] foo
+yq w --doc 2 things.yaml a.b.d[+] foo
+yq w -d2 things.yaml a.b.d[+] foo
       `,
 		Long: `Updates the yaml file w.r.t the given path and value.
 Outputs to STDOUT unless the inplace flag is used, in which case the file is updated instead.
@@ -124,6 +132,7 @@ a.b.e:
 	}
 	cmdWrite.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the yaml file inplace")
 	cmdWrite.PersistentFlags().StringVarP(&writeScript, "script", "s", "", "yaml script for updating yaml")
+	cmdWrite.PersistentFlags().StringVarP(&docIndex, "doc", "d", "0", "process document index number (0 based, * for all documents)")
 	return cmdWrite
 }
 
@@ -131,7 +140,7 @@ func createDeleteCmd() *cobra.Command {
 	var cmdDelete = &cobra.Command{
 		Use:     "delete [yaml_file] [path]",
 		Aliases: []string{"d"},
-		Short:   "yq d [--inplace/-i] sample.yaml a.b.c",
+		Short:   "yq d [--inplace/-i] [--doc/-d index] sample.yaml a.b.c",
 		Example: `
 yq delete things.yaml a.b.c
 yq delete --inplace things.yaml a.b.c
@@ -144,6 +153,7 @@ Outputs to STDOUT unless the inplace flag is used, in which case the file is upd
 		RunE: deleteProperty,
 	}
 	cmdDelete.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the yaml file inplace")
+	cmdDelete.PersistentFlags().StringVarP(&docIndex, "doc", "d", "0", "process document index number (0 based, * for all documents)")
 	return cmdDelete
 }
 
@@ -151,7 +161,7 @@ func createNewCmd() *cobra.Command {
 	var cmdNew = &cobra.Command{
 		Use:     "new [path] [value]",
 		Aliases: []string{"n"},
-		Short:   "yq n [--script/-s script_file] a.b.c newValueForC",
+		Short:   "yq n [--script/-s script_file] a.b.c newValue",
 		Example: `
 yq new a.b.c cat
 yq n a.b.c cat
@@ -173,7 +183,7 @@ func createMergeCmd() *cobra.Command {
 	var cmdMerge = &cobra.Command{
 		Use:     "merge [initial_yaml_file] [additional_yaml_file]...",
 		Aliases: []string{"m"},
-		Short:   "yq m [--inplace/-i] [--overwrite/-x] sample.yaml sample2.yaml",
+		Short:   "yq m [--inplace/-i] [--doc/-d index] [--overwrite/-x] sample.yaml sample2.yaml",
 		Example: `
 yq merge things.yaml other.yaml
 yq merge --inplace things.yaml other.yaml
@@ -190,6 +200,7 @@ If overwrite flag is set then existing values will be overwritten using the valu
 	}
 	cmdMerge.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the yaml file inplace")
 	cmdMerge.PersistentFlags().BoolVarP(&overwriteFlag, "overwrite", "x", false, "update the yaml file by overwriting existing values")
+	cmdMerge.PersistentFlags().StringVarP(&docIndex, "doc", "d", "0", "process document index number (0 based, * for all documents)")
 	return cmdMerge
 }
 
@@ -207,7 +218,6 @@ func readProperty(cmd *cobra.Command, args []string) error {
 }
 
 func read(args []string) (interface{}, error) {
-	var parsedData yaml.MapSlice
 	var path = ""
 
 	if len(args) < 1 {
@@ -215,67 +225,20 @@ func read(args []string) (interface{}, error) {
 	} else if len(args) > 1 {
 		path = args[1]
 	}
-
-	if err := readData(args[0], &parsedData); err != nil {
-		var generalData interface{}
-		if err = readData(args[0], &generalData); err != nil {
-			return nil, err
-		}
-		item := yaml.MapItem{Key: "thing", Value: generalData}
-		parsedData = yaml.MapSlice{item}
-		path = "thing." + path
+	var generalData interface{}
+	var docIndexInt, errorParsingDocumentIndex = strconv.ParseInt(docIndex, 10, 32)
+	if errorParsingDocumentIndex != nil {
+		return nil, errors.Wrapf(errorParsingDocumentIndex, "Document index %v is not a integer", docIndex)
 	}
-
-	if parsedData != nil && parsedData[0].Key == nil {
-		var interfaceData []map[interface{}]interface{}
-		if err := readData(args[0], &interfaceData); err == nil {
-			var listMap []yaml.MapSlice
-			for _, item := range interfaceData {
-				listMap = append(listMap, mapToMapSlice(item))
-			}
-			return readYamlArray(listMap, path)
-		}
+	if err := readData(args[0], int(docIndexInt), &generalData); err != nil {
+		return nil, err
 	}
-
 	if path == "" {
-		return parsedData, nil
+		return generalData, nil
 	}
 
 	var paths = parsePath(path)
-
-	return readMap(parsedData, paths[0], paths[1:])
-}
-
-func readYamlArray(listMap []yaml.MapSlice, path string) (interface{}, error) {
-	if path == "" {
-		return listMap, nil
-	}
-
-	var paths = parsePath(path)
-
-	if paths[0] == "*" {
-		if len(paths[1:]) == 0 {
-			return listMap, nil
-		}
-		var results []interface{}
-		for _, m := range listMap {
-			value, err := readMap(m, paths[1], paths[2:])
-			if err != nil {
-				return nil, err
-			}
-			results = append(results, value)
-		}
-		return results, nil
-	}
-
-	index, err := strconv.ParseInt(paths[0], 10, 64)
-	if err != nil {
-		return nil, fmt.Errorf("Error accessing array: %v", err)
-	}
-	if len(paths[1:]) == 0 {
-		return listMap[index], nil
-	}
-	return readMap(listMap[index], paths[1], paths[2:])
+	return recurse(generalData, paths[0], paths[1:])
 }
 
 func newProperty(cmd *cobra.Command, args []string) error {
@@ -292,159 +255,205 @@ func newProperty(cmd *cobra.Command, args []string) error {
 }
 
 func newYaml(args []string) (interface{}, error) {
-	var writeCommands yaml.MapSlice
-	if writeScript != "" {
-		if err := readData(writeScript, &writeCommands); err != nil {
-			return nil, err
-		}
-	} else if len(args) < 2 {
-		return nil, errors.New("Must provide <path_to_update> <value>")
-	} else {
-		writeCommands = make(yaml.MapSlice, 1)
-		writeCommands[0] = yaml.MapItem{Key: args[0], Value: parseValue(args[1])}
+	var writeCommands, writeCommandsError = readWriteCommands(args, 2, "Must provide <path_to_update> <value>")
+	if writeCommandsError != nil {
+		return nil, writeCommandsError
 	}
 
-	var parsedData yaml.MapSlice
-	var prependCommand = ""
+	var dataBucket interface{}
 	var isArray = strings.HasPrefix(writeCommands[0].Key.(string), "[")
 	if isArray {
-		item := yaml.MapItem{Key: "thing", Value: make(yaml.MapSlice, 0)}
-		parsedData = yaml.MapSlice{item}
-		prependCommand = "thing"
+		dataBucket = make([]interface{}, 0)
 	} else {
-		parsedData = make(yaml.MapSlice, 0)
+		dataBucket = make(yaml.MapSlice, 0)
 	}
 
-	return updateParsedData(parsedData, writeCommands, prependCommand)
+	for _, entry := range writeCommands {
+		path := entry.Key.(string)
+		value := entry.Value
+		log.Debugf("setting %v to %v", path, value)
+		var paths = parsePath(path)
+		dataBucket = updatedChildValue(dataBucket, paths, value)
+	}
+
+	return dataBucket, nil
+}
+
+func parseDocumentIndex() (bool, int, error) {
+	if docIndex == "*" {
+		return true, -1, nil
+	}
+	docIndexInt64, err := strconv.ParseInt(docIndex, 10, 32)
+	if err != nil {
+		return false, -1, errors.Wrapf(err, "Document index %v is not a integer or *", docIndex)
+	}
+	return false, int(docIndexInt64), nil
+}
+
+type updateDataFn func(dataBucket interface{}, currentIndex int) (interface{}, error)
+
+func mapYamlDecoder(updateData updateDataFn, encoder *yaml.Encoder) yamlDecoderFn {
+	return func(decoder *yaml.Decoder) error {
+		var dataBucket interface{}
+		var errorReading error
+		var errorWriting error
+		var errorUpdating error
+		var currentIndex = 0
+
+		var updateAll, docIndexInt, errorParsingDocIndex = parseDocumentIndex()
+		if errorParsingDocIndex != nil {
+			return errorParsingDocIndex
+		}
+
+		for {
+			log.Debugf("Read doc %v", currentIndex)
+			errorReading = decoder.Decode(&dataBucket)
+
+			if errorReading == io.EOF {
+				if !updateAll && currentIndex < docIndexInt {
+					return fmt.Errorf("Asked to process document %v but there are only %v document(s)", docIndex, currentIndex)
+				}
+				return nil
+			} else if errorReading != nil {
+				return errors.Wrapf(errorReading, "Error reading document at index %v, %v", currentIndex, errorReading)
+			}
+			dataBucket, errorUpdating = updateData(dataBucket, currentIndex)
+			if errorUpdating != nil {
+				return errors.Wrapf(errorUpdating, "Error updating document at index %v", currentIndex)
+			}
+
+			errorWriting = encoder.Encode(dataBucket)
+
+			if errorWriting != nil {
+				return errors.Wrapf(errorWriting, "Error writing document at index %v, %v", currentIndex, errorWriting)
+			}
+			currentIndex = currentIndex + 1
+		}
+	}
 }
 
 func writeProperty(cmd *cobra.Command, args []string) error {
-	updatedData, err := updateYaml(args)
-	if err != nil {
-		return err
+	var writeCommands, writeCommandsError = readWriteCommands(args, 3, "Must provide <filename> <path_to_update> <value>")
+	if writeCommandsError != nil {
+		return writeCommandsError
 	}
-	return write(cmd, args[0], updatedData)
+	var updateAll, docIndexInt, errorParsingDocIndex = parseDocumentIndex()
+	if errorParsingDocIndex != nil {
+		return errorParsingDocIndex
+	}
+
+	var updateData = func(dataBucket interface{}, currentIndex int) (interface{}, error) {
+		if updateAll || currentIndex == docIndexInt {
+			log.Debugf("Updating doc %v", currentIndex)
+			for _, entry := range writeCommands {
+				path := entry.Key.(string)
+				value := entry.Value
+				log.Debugf("setting %v to %v", path, value)
+				var paths = parsePath(path)
+				dataBucket = updatedChildValue(dataBucket, paths, value)
+			}
+		}
+		return dataBucket, nil
+	}
+	return readAndUpdate(cmd.OutOrStdout(), args[0], updateData)
 }
 
-func write(cmd *cobra.Command, filename string, updatedData interface{}) error {
+func readAndUpdate(stdOut io.Writer, inputFile string, updateData updateDataFn) error {
+	var destination io.Writer
+	var destinationName string
 	if writeInplace {
-		dataStr, err := yamlToString(updatedData)
+		var tempFile, err = ioutil.TempFile("", "temp")
 		if err != nil {
 			return err
 		}
-		return ioutil.WriteFile(filename, []byte(dataStr), 0644)
+		destinationName = tempFile.Name()
+		destination = tempFile
+		defer func() {
+			safelyCloseFile(tempFile)
+			safelyRenameFile(tempFile.Name(), inputFile)
+		}()
+	} else {
+		var writer = bufio.NewWriter(stdOut)
+		destination = writer
+		destinationName = "Stdout"
+		defer safelyFlush(writer)
 	}
-	dataStr, err := toString(updatedData)
-	if err != nil {
-		return err
-	}
-	cmd.Println(dataStr)
-	return nil
+	var encoder = yaml.NewEncoder(destination)
+	log.Debugf("Writing to %v from %v", destinationName, inputFile)
+	return readStream(inputFile, mapYamlDecoder(updateData, encoder))
 }
 
 func deleteProperty(cmd *cobra.Command, args []string) error {
-	updatedData, err := deleteYaml(args)
-	if err != nil {
-		return err
-	}
-	return write(cmd, args[0], updatedData)
-}
-
-func deleteYaml(args []string) (interface{}, error) {
-	var parsedData yaml.MapSlice
-	var deletePath string
-
 	if len(args) < 2 {
-		return nil, errors.New("Must provide <filename> <path_to_delete>")
+		return errors.New("Must provide <filename> <path_to_delete>")
+	}
+	var deletePath = args[1]
+	var paths = parsePath(deletePath)
+	var updateAll, docIndexInt, errorParsingDocIndex = parseDocumentIndex()
+	if errorParsingDocIndex != nil {
+		return errorParsingDocIndex
 	}
 
-	deletePath = args[1]
-
-	if err := readData(args[0], &parsedData); err != nil {
-		var generalData interface{}
-		if err = readData(args[0], &generalData); err != nil {
-			return nil, err
+	var updateData = func(dataBucket interface{}, currentIndex int) (interface{}, error) {
+		if updateAll || currentIndex == docIndexInt {
+			log.Debugf("Deleting path in doc %v", currentIndex)
+			return deleteChildValue(dataBucket, paths), nil
 		}
-		item := yaml.MapItem{Key: "thing", Value: generalData}
-		parsedData = yaml.MapSlice{item}
-		deletePath = "thing." + deletePath
+		return dataBucket, nil
 	}
 
-	path := parsePath(deletePath)
-	return deleteMap(parsedData, path), nil
+	return readAndUpdate(cmd.OutOrStdout(), args[0], updateData)
 }
 
 func mergeProperties(cmd *cobra.Command, args []string) error {
 	if len(args) < 2 {
 		return errors.New("Must provide at least 2 yaml files")
 	}
-
-	updatedData, err := mergeYaml(args)
-	if err != nil {
-		return err
+	var input = args[0]
+	var filesToMerge = args[1:]
+	var updateAll, docIndexInt, errorParsingDocIndex = parseDocumentIndex()
+	if errorParsingDocIndex != nil {
+		return errorParsingDocIndex
 	}
-	return write(cmd, args[0], updatedData)
-}
 
-func mergeYaml(args []string) (interface{}, error) {
-	var updatedData map[interface{}]interface{}
-
-	for _, f := range args {
-		var parsedData map[interface{}]interface{}
-		if err := readData(f, &parsedData); err != nil {
-			return nil, err
-		}
-		if err := merge(&updatedData, parsedData, overwriteFlag); err != nil {
-			return nil, err
+	var updateData = func(dataBucket interface{}, currentIndex int) (interface{}, error) {
+		if updateAll || currentIndex == docIndexInt {
+			log.Debugf("Merging doc %v", currentIndex)
+			var mergedData map[interface{}]interface{}
+			if err := merge(&mergedData, dataBucket, overwriteFlag); err != nil {
+				return nil, err
+			}
+			for _, f := range filesToMerge {
+				var fileToMerge interface{}
+				if err := readData(f, 0, &fileToMerge); err != nil {
+					return nil, err
+				}
+				if err := merge(&mergedData, fileToMerge, overwriteFlag); err != nil {
+					return nil, err
+				}
+			}
+			return mergedData, nil
 		}
+		return dataBucket, nil
 	}
-
-	return mapToMapSlice(updatedData), nil
+	yaml.DefaultMapType = reflect.TypeOf(map[interface{}]interface{}{})
+	defer func() { yaml.DefaultMapType = reflect.TypeOf(yaml.MapSlice{}) }()
+	return readAndUpdate(cmd.OutOrStdout(), input, updateData)
 }
 
-func updateParsedData(parsedData yaml.MapSlice, writeCommands yaml.MapSlice, prependCommand string) (interface{}, error) {
-	var prefix = ""
-	if prependCommand != "" {
-		prefix = prependCommand + "."
-	}
-	for _, entry := range writeCommands {
-		path := prefix + entry.Key.(string)
-		value := entry.Value
-		var paths = parsePath(path)
-		parsedData = writeMap(parsedData, paths, value)
-	}
-	if prependCommand != "" {
-		return readMap(parsedData, prependCommand, make([]string, 0))
-	}
-	return parsedData, nil
-}
-
-func updateYaml(args []string) (interface{}, error) {
+func readWriteCommands(args []string, expectedArgs int, badArgsMessage string) (yaml.MapSlice, error) {
 	var writeCommands yaml.MapSlice
-	var prependCommand = ""
 	if writeScript != "" {
-		if err := readData(writeScript, &writeCommands); err != nil {
+		if err := readData(writeScript, 0, &writeCommands); err != nil {
 			return nil, err
 		}
-	} else if len(args) < 3 {
-		return nil, errors.New("Must provide <filename> <path_to_update> <value>")
+	} else if len(args) < expectedArgs {
+		return nil, errors.New(badArgsMessage)
 	} else {
 		writeCommands = make(yaml.MapSlice, 1)
-		writeCommands[0] = yaml.MapItem{Key: args[1], Value: parseValue(args[2])}
+		writeCommands[0] = yaml.MapItem{Key: args[expectedArgs-2], Value: parseValue(args[expectedArgs-1])}
 	}
-
-	var parsedData yaml.MapSlice
-	if err := readData(args[0], &parsedData); err != nil {
-		var generalData interface{}
-		if err = readData(args[0], &generalData); err != nil {
-			return nil, err
-		}
-		item := yaml.MapItem{Key: "thing", Value: generalData}
-		parsedData = yaml.MapSlice{item}
-		prependCommand = "thing"
-	}
-
-	return updateParsedData(parsedData, writeCommands, prependCommand)
+	return writeCommands, nil
 }
 
 func parseValue(argument string) interface{} {
@@ -487,7 +496,7 @@ func marshalContext(context interface{}) (string, error) {
 	out, err := yaml.Marshal(context)
 
 	if err != nil {
-		return "", fmt.Errorf("error printing yaml: %v", err)
+		return "", errors.Wrap(err, "error printing yaml")
 	}
 
 	outStr := string(out)
@@ -499,22 +508,81 @@ func marshalContext(context interface{}) (string, error) {
 	return outStr, nil
 }
 
-func readData(filename string, parsedData interface{}) error {
+func safelyRenameFile(from string, to string) {
+	if renameError := os.Rename(from, to); renameError != nil {
+		log.Warningf("Error renaming from %v to %v, attemting to copy contents", from, to)
+		log.Warning(renameError.Error())
+		// can't do this rename when running in docker to a file targeted in a mounted volume,
+		// so gracefully degrade to copying the entire contents.
+		if copyError := copyFileContents(from, to); copyError != nil {
+			log.Errorf("Failed copying from %v to %v", from, to)
+			log.Errorf(copyError.Error())
+		}
+	}
+}
+
+// thanks https://stackoverflow.com/questions/21060945/simple-way-to-copy-a-file-in-golang
+func copyFileContents(src, dst string) (err error) {
+	in, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer safelyCloseFile(in)
+	out, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer safelyCloseFile(out)
+	if _, err = io.Copy(out, in); err != nil {
+		return err
+	}
+	return out.Sync()
+}
+
+func safelyFlush(writer *bufio.Writer) {
+	if err := writer.Flush(); err != nil {
+		log.Error("Error flushing writer!")
+		log.Error(err.Error())
+	}
+
+}
+func safelyCloseFile(file *os.File) {
+	err := file.Close()
+	if err != nil {
+		log.Error("Error closing file!")
+		log.Error(err.Error())
+	}
+}
+
+type yamlDecoderFn func(*yaml.Decoder) error
+
+func readStream(filename string, yamlDecoder yamlDecoderFn) error {
 	if filename == "" {
 		return errors.New("Must provide filename")
 	}
 
-	var rawData []byte
-	var err error
+	var stream io.Reader
 	if filename == "-" {
-		rawData, err = ioutil.ReadAll(os.Stdin)
+		stream = bufio.NewReader(os.Stdin)
 	} else {
-		rawData, err = ioutil.ReadFile(filename)
+		file, err := os.Open(filename)
+		if err != nil {
+			return err
+		}
+		defer safelyCloseFile(file)
+		stream = file
 	}
-
-	if err != nil {
-		return err
-	}
-
-	return yaml.Unmarshal(rawData, parsedData)
+	return yamlDecoder(yaml.NewDecoder(stream))
+}
+
+func readData(filename string, indexToRead int, parsedData interface{}) error {
+	return readStream(filename, func(decoder *yaml.Decoder) error {
+		for currentIndex := 0; currentIndex < indexToRead; currentIndex++ {
+			errorSkipping := decoder.Decode(parsedData)
+			if errorSkipping != nil {
+				return errors.Wrapf(errorSkipping, "Error processing document at index %v, %v", currentIndex, errorSkipping)
+			}
+		}
+		return decoder.Decode(parsedData)
+	})
 }

yq_test.go

@@ -28,6 +28,13 @@ func TestRead(t *testing.T) {
 	assertResult(t, 2, result)
 }
 
+func TestReadMulti(t *testing.T) {
+	docIndex = "1"
+	result, _ := read([]string{"examples/multiple_docs.yaml", "another.document"})
+	assertResult(t, "here", result)
+	docIndex = "0"
+}
+
 func TestReadArray(t *testing.T) {
 	result, _ := read([]string{"examples/sample_array.yaml", "[1]"})
 	assertResult(t, 2, result)
@@ -71,37 +78,6 @@ func TestNewYamlArray(t *testing.T) {
 		formattedResult)
 }
 
-func TestUpdateYaml(t *testing.T) {
-	result, _ := updateYaml([]string{"examples/sample.yaml", "b.c", "3"})
-	formattedResult := fmt.Sprintf("%v", result)
-	assertResult(t,
-		"[{a Easy! as one two three} {b [{c 3} {d [3 4]} {e [[{name fred} {value 3}] [{name sam} {value 4}]]}]}]",
-		formattedResult)
-}
-
-func TestUpdateYamlArray(t *testing.T) {
-	result, _ := updateYaml([]string{"examples/sample_array.yaml", "[0]", "3"})
-	formattedResult := fmt.Sprintf("%v", result)
-	assertResult(t,
-		"[3 2 3]",
-		formattedResult)
-}
-
-func TestUpdateYaml_WithScript(t *testing.T) {
-	writeScript = "examples/instruction_sample.yaml"
-	_, _ = updateYaml([]string{"examples/sample.yaml"})
-}
-
-func TestUpdateYaml_WithUnknownScript(t *testing.T) {
-	writeScript = "fake-unknown"
-	_, err := updateYaml([]string{"examples/sample.yaml"})
-	if err == nil {
-		t.Error("Expected error due to unknown file")
-	}
-	expectedOutput := `open fake-unknown: no such file or directory`
-	assertResult(t, expectedOutput, err.Error())
-}
-
 func TestNewYaml_WithScript(t *testing.T) {
 	writeScript = "examples/instruction_sample.yaml"
 	expectedResult := `b:
@@ -122,11 +98,3 @@ func TestNewYaml_WithUnknownScript(t *testing.T) {
 	expectedOutput := `open fake-unknown: no such file or directory`
 	assertResult(t, expectedOutput, err.Error())
 }
-
-func TestDeleteYaml(t *testing.T) {
-	result, _ := deleteYaml([]string{"examples/sample.yaml", "b.c"})
-	formattedResult := fmt.Sprintf("%v", result)
-	assertResult(t,
-		"[{a Easy! as one two three} {b [{d [3 4]} {e [[{name fred} {value 3}] [{name sam} {value 4}]]}]}]",
-		formattedResult)
-}