Version bump

The delete (short option "d") will delete the YAML subtree at the
provided path in the specified file (or STDIN), if it the node exists.

More complex support is currently omitted, for example:

  - specify nodes to delete using an external script
  - deleting common elements from all elements of an array

Dockerfile

@@ -0,0 +1,17 @@
+FROM golang:1.9 as builder
+
+WORKDIR /go/src/mikefarah/yq
+
+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
+# CI tools expect an interactive shell inside the container
+FROM alpine:3.7
+
+COPY --from=builder /go/src/mikefarah/yq/yq /usr/bin/yq
+RUN chmod +x /usr/bin/yq
+
+WORKDIR /workdir

README.md

@@ -12,11 +12,31 @@ 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
 ```
 
+## Run with Docker
+
+Oneshot use:
+
+```bash
+docker run -v ${PWD}:/workdir mikefarah/yq yq [flags] <command> FILE...
+```
+
+Run commands interactively:
+
+```bash
+docker run -it -v ${PWD}:/workdir mikefarah/yq sh
+```
+
 ## Features
 - Written in portable go, so you can download a lovely dependency free binary
 - Deep read a yaml file with a given path
@@ -41,6 +61,7 @@ Usage:
   yq [command]
 
 Available Commands:
+  delete      yq d [--inplace/-i] 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
@@ -62,4 +83,8 @@ Use "yq [command] --help" for more information about a command.
 2. add unit tests
 3. apply changes
 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

@@ -103,7 +103,7 @@ func TestRootCmd_VersionShort(t *testing.T) {
 	if result.Error != nil {
 		t.Error(result.Error)
 	}
-	if !strings.Contains(result.Output, "yaml version") {
+	if !strings.Contains(result.Output, "yq version") {
 		t.Error("expected version message to be printed out, but the message was not found.")
 	}
 }
@@ -114,7 +114,7 @@ func TestRootCmd_VersionLong(t *testing.T) {
 	if result.Error != nil {
 		t.Error(result.Error)
 	}
-	if !strings.Contains(result.Output, "yaml version") {
+	if !strings.Contains(result.Output, "yq version") {
 		t.Error("expected version message to be printed out, but the message was not found.")
 	}
 }
@@ -128,6 +128,15 @@ 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")
@@ -363,6 +372,28 @@ 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 TestWriteCmd_EmptyArray(t *testing.T) {
 	content := `b: 3`
 	filename := writeTempYamlFile(content)
@@ -432,7 +463,7 @@ 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 +503,72 @@ 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 TestMergeCmd(t *testing.T) {
 	cmd := getRootCommand()
 	result := runCmd(cmd, "merge examples/data1.yaml examples/data2.yaml")
@@ -488,6 +585,25 @@ c:
 	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 TestMergeCmd_Error(t *testing.T) {
 	cmd := getRootCommand()
 	result := runCmd(cmd, "merge examples/data1.yaml")
@@ -504,7 +620,7 @@ 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 +656,5 @@ b:
 - 2
 c:
   test: 1`
-	assertResult(t, expectedOutput, gotOutput)
+	assertResult(t, expectedOutput, strings.Trim(gotOutput, "\n "))
 }

data_navigator.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"sort"
 	"strconv"
 
 	"gopkg.in/yaml.v2"
@@ -18,9 +17,7 @@ func entryInSlice(context yaml.MapSlice, key interface{}) *yaml.MapItem {
 	return nil
 }
 
-func writeMap(context interface{}, paths []string, value interface{}) yaml.MapSlice {
-	log.Debugf("writeMap for %v for %v with value %v\n", paths, context, value)
-
+func getMapSlice(context interface{}) yaml.MapSlice {
 	var mapSlice yaml.MapSlice
 	switch context.(type) {
 	case yaml.MapSlice:
@@ -28,6 +25,25 @@ func writeMap(context interface{}, paths []string, value interface{}) yaml.MapSl
 	default:
 		mapSlice = make(yaml.MapSlice, 0)
 	}
+	return mapSlice
+}
+
+func getArray(context interface{}) (array []interface{}, ok bool) {
+	switch context.(type) {
+	case []interface{}:
+		array = context.([]interface{})
+		ok = true
+	default:
+		array = make([]interface{}, 0)
+		ok = false
+	}
+	return
+}
+
+func writeMap(context interface{}, paths []string, value interface{}) yaml.MapSlice {
+	log.Debugf("writeMap for %v for %v with value %v\n", paths, context, value)
+
+	mapSlice := getMapSlice(context)
 
 	if len(paths) == 0 {
 		return mapSlice
@@ -66,13 +82,7 @@ func updatedChildValue(child interface{}, remainingPaths []string, value interfa
 
 func writeArray(context interface{}, paths []string, value interface{}) []interface{} {
 	log.Debugf("writeArray for %v for %v with value %v\n", paths, context, value)
-	var array []interface{}
-	switch context.(type) {
-	case []interface{}:
-		array = context.([]interface{})
-	default:
-		array = make([]interface{}, 0)
-	}
+	array, _ := getArray(context)
 
 	if len(paths) == 0 {
 		return array
@@ -183,19 +193,92 @@ func calculateValue(value interface{}, tail []string) (interface{}, error) {
 	return value, nil
 }
 
-func mapToMapSlice(data map[interface{}]interface{}) yaml.MapSlice {
-	var mapSlice yaml.MapSlice
+func deleteMap(context interface{}, paths []string) yaml.MapSlice {
+	log.Debugf("deleteMap for %v for %v\n", paths, context)
 
-	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)
+	mapSlice := getMapSlice(context)
+
+	if len(paths) == 0 {
+		return mapSlice
 	}
 
-	// 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
+	var found bool
+	var index int
+	var child yaml.MapItem
+	for index, child = range mapSlice {
+		if child.Key == paths[0] {
+			found = true
+			break
+		}
+	}
+
+	if !found {
+		return mapSlice
+	}
+
+	remainingPaths := paths[1:]
+
+	var newSlice yaml.MapSlice
+	if len(remainingPaths) > 0 {
+		newChild := yaml.MapItem{Key: child.Key}
+		newChild.Value = deleteChildValue(child.Value, remainingPaths)
+
+		newSlice = make(yaml.MapSlice, len(mapSlice))
+		for i := range mapSlice {
+			item := mapSlice[i]
+			if i == index {
+				item = newChild
+			}
+			newSlice[i] = item
+		}
+	} else {
+		// Delete item from slice at index
+		newSlice = append(mapSlice[:index], mapSlice[index+1:]...)
+		log.Debugf("\tDeleted item index %d from mapSlice", index)
+	}
+
+	log.Debugf("\t\tlen: %d\tcap: %d\tslice: %v", len(mapSlice), cap(mapSlice), mapSlice)
+	log.Debugf("\tReturning mapSlice %v\n", mapSlice)
+	return newSlice
+}
+
+func deleteArray(context interface{}, paths []string, index int64) interface{} {
+	log.Debugf("deleteArray for %v for %v\n", paths, context)
+
+	array, ok := getArray(context)
+	if !ok {
+		// did not get an array
+		return context
+	}
+
+	if index >= int64(len(array)) {
+		return array
+	}
+
+	remainingPaths := paths[1:]
+	if len(remainingPaths) > 0 {
+		// Recurse into the array element at index
+		array[index] = deleteMap(array[index], remainingPaths)
+	} else {
+		// Delete the array element at index
+		array = append(array[:index], array[index+1:]...)
+		log.Debugf("\tDeleted item index %d from array, leaving %v", index, array)
+	}
+
+	log.Debugf("\tReturning array: %v\n", array)
+	return array
+}
+
+func deleteChildValue(child interface{}, remainingPaths []string) interface{} {
+	log.Debugf("deleteChildValue for %v for %v\n", remainingPaths, child)
+
+	idx, nextIndexErr := strconv.ParseInt(remainingPaths[0], 10, 64)
+	if nextIndexErr != nil {
+		// must be a map
+		log.Debugf("\tdetected a map, invoking deleteMap\n")
+		return deleteMap(child, remainingPaths)
+	}
+
+	log.Debugf("\tdetected an array, so traversing element with index %d\n", idx)
+	return deleteArray(child, remainingPaths, idx)
 }

data_navigator_test.go

@@ -308,3 +308,80 @@ func TestWriteArray_no_paths(t *testing.T) {
 	result := writeArray(data, []string{}, 4)
 	assertResult(t, fmt.Sprintf("%v", data), fmt.Sprintf("%v", result))
 }
+
+func TestDelete_MapItem(t *testing.T) {
+	var data = parseData(`
+a: 123
+b: 456
+`)
+	var expected = parseData(`
+b: 456
+`)
+
+	result := deleteMap(data, []string{"a"})
+	assertResult(t, fmt.Sprintf("%v", expected), fmt.Sprintf("%v", result))
+}
+
+// Ensure deleting an index into a string does nothing
+func TestDelete_index_to_string(t *testing.T) {
+	var data = parseData(`
+a: mystring
+`)
+	result := deleteMap(data, []string{"a", "0"})
+	assertResult(t, fmt.Sprintf("%v", data), fmt.Sprintf("%v", result))
+}
+
+func TestDelete_list_index(t *testing.T) {
+	var data = parseData(`
+a: [3, 4]
+`)
+	var expected = parseData(`
+a: [3]
+`)
+	result := deleteMap(data, []string{"a", "1"})
+	assertResult(t, fmt.Sprintf("%v", expected), fmt.Sprintf("%v", result))
+}
+
+func TestDelete_list_index_beyond_bounds(t *testing.T) {
+	var data = parseData(`
+a: [3, 4]
+`)
+	result := deleteMap(data, []string{"a", "5"})
+	assertResult(t, fmt.Sprintf("%v", data), fmt.Sprintf("%v", result))
+}
+
+func TestDelete_list_index_out_of_bounds_by_1(t *testing.T) {
+	var data = parseData(`
+a: [3, 4]
+`)
+	result := deleteMap(data, []string{"a", "2"})
+	assertResult(t, fmt.Sprintf("%v", data), fmt.Sprintf("%v", result))
+}
+
+func TestDelete_no_paths(t *testing.T) {
+	var data = parseData(`
+a: [3, 4]
+b:
+  - name: test
+`)
+	result := deleteMap(data, []string{})
+	assertResult(t, fmt.Sprintf("%v", data), fmt.Sprintf("%v", result))
+}
+
+func TestDelete_array_map_item(t *testing.T) {
+	var data = parseData(`
+b:
+- name: fred
+  value: blah
+- name: john
+  value: test
+`)
+	var expected = parseData(`
+b:
+- value: blah
+- name: john
+  value: test
+`)
+	result := deleteMap(data, []string{"b", "0", "name"})
+	assertResult(t, fmt.Sprintf("%v", expected), fmt.Sprintf("%v", result))
+}

debian/changelog

@@ -0,0 +1,6 @@
+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/404.html

@@ -238,6 +238,18 @@
       
 
 
+  <li class="md-nav__item">
+    <a href="/delete/" title="Delete" class="md-nav__link">
+      Delete
+    </a>
+  </li>
+
+    
+      
+      
+      
+
+
   <li class="md-nav__item">
     <a href="/create/" title="Create" class="md-nav__link">
       Create

docs/convert/index.html

@@ -238,6 +238,18 @@
       
 
 
+  <li class="md-nav__item">
+    <a href="../delete/" title="Delete" class="md-nav__link">
+      Delete
+    </a>
+  </li>
+
+    
+      
+      
+      
+
+
   <li class="md-nav__item">
     <a href="../create/" title="Create" class="md-nav__link">
       Create

docs/create/index.html

@@ -237,6 +237,18 @@
       
       
 
+
+  <li class="md-nav__item">
+    <a href="../delete/" title="Delete" class="md-nav__link">
+      Delete
+    </a>
+  </li>
+
+    
+      
+      
+      
+
   
 
 
@@ -440,7 +452,7 @@ b.e[0].name: Howdy Partner
     <div class="md-footer-nav">
       <nav class="md-footer-nav__inner md-grid">
         
-          <a href="../write/" title="Write/Update" class="md-flex md-footer-nav__link md-footer-nav__link--prev" rel="prev">
+          <a href="../delete/" title="Delete" class="md-flex md-footer-nav__link md-footer-nav__link--prev" rel="prev">
             <div class="md-flex__cell md-flex__cell--shrink">
               <i class="md-icon md-icon--arrow-back md-footer-nav__button"></i>
             </div>
@@ -449,7 +461,7 @@ b.e[0].name: Howdy Partner
                 <span class="md-footer-nav__direction">
                   Previous
                 </span>
-                Write/Update
+                Delete
               </span>
             </div>
           </a>

docs/delete/index.html

@@ -0,0 +1,574 @@
+
+
+
+
+<!DOCTYPE html>
+<html lang="en" class="no-js">
+  <head>
+    
+      <meta charset="utf-8">
+      <meta name="viewport" content="width=device-width,initial-scale=1">
+      <meta http-equiv="x-ua-compatible" content="ie=edge">
+      
+      
+      
+      
+        <meta name="lang:clipboard.copy" content="Copy to clipboard">
+      
+        <meta name="lang:clipboard.copied" content="Copied to clipboard">
+      
+        <meta name="lang:search.language" content="en">
+      
+        <meta name="lang:search.result.none" content="No matching documents">
+      
+        <meta name="lang:search.result.one" content="1 matching document">
+      
+        <meta name="lang:search.result.other" content="# matching documents">
+      
+        <meta name="lang:search.tokenizer" content="[\s\-]+">
+      
+      <link rel="shortcut icon" href="../assets/images/favicon.png">
+      <meta name="generator" content="mkdocs-0.17.2, mkdocs-material-2.2.5">
+    
+    
+      
+        <title>Delete - Yq</title>
+      
+    
+    
+      <link rel="stylesheet" href="../assets/stylesheets/application.bcabdff3.css">
+      
+    
+    
+      <script src="../assets/javascripts/modernizr.1aa3b519.js"></script>
+    
+    
+      
+        <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,400i,700|Roboto+Mono">
+        <style>body,input{font-family:"Roboto","Helvetica Neue",Helvetica,Arial,sans-serif}code,kbd,pre{font-family:"Roboto Mono","Courier New",Courier,monospace}</style>
+      
+      <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
+    
+    
+    
+  </head>
+  
+    <body>
+  
+    <svg class="md-svg">
+      <defs>
+        
+        
+          <svg xmlns="http://www.w3.org/2000/svg" width="416" height="448" viewBox="0 0 416 448" id="github"><path fill="currentColor" d="M160 304q0 10-3.125 20.5t-10.75 19T128 352t-18.125-8.5-10.75-19T96 304t3.125-20.5 10.75-19T128 256t18.125 8.5 10.75 19T160 304zm160 0q0 10-3.125 20.5t-10.75 19T288 352t-18.125-8.5-10.75-19T256 304t3.125-20.5 10.75-19T288 256t18.125 8.5 10.75 19T320 304zm40 0q0-30-17.25-51T296 232q-10.25 0-48.75 5.25Q229.5 240 208 240t-39.25-2.75Q130.75 232 120 232q-29.5 0-46.75 21T56 304q0 22 8 38.375t20.25 25.75 30.5 15 35 7.375 37.25 1.75h42q20.5 0 37.25-1.75t35-7.375 30.5-15 20.25-25.75T360 304zm56-44q0 51.75-15.25 82.75-9.5 19.25-26.375 33.25t-35.25 21.5-42.5 11.875-42.875 5.5T212 416q-19.5 0-35.5-.75t-36.875-3.125-38.125-7.5-34.25-12.875T37 371.5t-21.5-28.75Q0 312 0 260q0-59.25 34-99-6.75-20.5-6.75-42.5 0-29 12.75-54.5 27 0 47.5 9.875t47.25 30.875Q171.5 96 212 96q37 0 70 8 26.25-20.5 46.75-30.25T376 64q12.75 25.5 12.75 54.5 0 21.75-6.75 42 34 40 34 99.5z"/></svg>
+        
+      </defs>
+    </svg>
+    <input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="drawer">
+    <input class="md-toggle" data-md-toggle="search" type="checkbox" id="search">
+    <label class="md-overlay" data-md-component="overlay" for="drawer"></label>
+    
+      <header class="md-header" data-md-component="header">
+  <nav class="md-header-nav md-grid">
+    <div class="md-flex">
+      <div class="md-flex__cell md-flex__cell--shrink">
+        <a href=".." title="Yq" class="md-header-nav__button md-logo">
+          
+            <i class="md-icon"></i>
+          
+        </a>
+      </div>
+      <div class="md-flex__cell md-flex__cell--shrink">
+        <label class="md-icon md-icon--menu md-header-nav__button" for="drawer"></label>
+      </div>
+      <div class="md-flex__cell md-flex__cell--stretch">
+        <div class="md-flex__ellipsis md-header-nav__title" data-md-component="title">
+          
+            
+              <span class="md-header-nav__topic">
+                Yq
+              </span>
+              <span class="md-header-nav__topic">
+                Delete
+              </span>
+            
+          
+        </div>
+      </div>
+      <div class="md-flex__cell md-flex__cell--shrink">
+        
+          
+            <label class="md-icon md-icon--search md-header-nav__button" for="search"></label>
+            
+<div class="md-search" data-md-component="search" role="dialog">
+  <label class="md-search__overlay" for="search"></label>
+  <div class="md-search__inner">
+    <form class="md-search__form" name="search">
+      <input type="text" class="md-search__input" name="query" required placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="query">
+      <label class="md-icon md-search__icon" for="search"></label>
+      <button type="reset" class="md-icon md-search__icon" data-md-component="reset">&#xE5CD;</button>
+    </form>
+    <div class="md-search__output">
+      <div class="md-search__scrollwrap" data-md-scrollfix>
+        <div class="md-search-result" data-md-component="result">
+          <div class="md-search-result__meta">
+            Type to start searching
+          </div>
+          <ol class="md-search-result__list"></ol>
+        </div>
+      </div>
+    </div>
+  </div>
+</div>
+          
+        
+      </div>
+      
+        <div class="md-flex__cell md-flex__cell--shrink">
+          <div class="md-header-nav__source">
+            
+
+
+  
+
+
+  <a href="https://github.com/mikefarah/yq/" title="Go to repository" class="md-source" data-md-source="github">
+    
+      <div class="md-source__icon">
+        <svg viewBox="0 0 24 24" width="24" height="24">
+          <use xlink:href="#github" width="24" height="24"></use>
+        </svg>
+      </div>
+    
+    <div class="md-source__repository">
+      mikefarah/yq
+    </div>
+  </a>
+
+          </div>
+        </div>
+      
+    </div>
+  </nav>
+</header>
+    
+    <div class="md-container">
+      
+        
+      
+      
+      <main class="md-main">
+        <div class="md-main__inner md-grid" data-md-component="container">
+          
+            
+              <div class="md-sidebar md-sidebar--primary" data-md-component="navigation">
+                <div class="md-sidebar__scrollwrap">
+                  <div class="md-sidebar__inner">
+                    <nav class="md-nav md-nav--primary" data-md-level="0">
+  <label class="md-nav__title md-nav__title--site" for="drawer">
+    <span class="md-nav__button md-logo">
+      
+        <i class="md-icon"></i>
+      
+    </span>
+    Yq
+  </label>
+  
+    <div class="md-nav__source">
+      
+
+
+  
+
+
+  <a href="https://github.com/mikefarah/yq/" title="Go to repository" class="md-source" data-md-source="github">
+    
+      <div class="md-source__icon">
+        <svg viewBox="0 0 24 24" width="24" height="24">
+          <use xlink:href="#github" width="24" height="24"></use>
+        </svg>
+      </div>
+    
+    <div class="md-source__repository">
+      mikefarah/yq
+    </div>
+  </a>
+
+    </div>
+  
+  <ul class="md-nav__list" data-md-scrollfix>
+    
+      
+      
+      
+
+
+  <li class="md-nav__item">
+    <a href=".." title="Install" class="md-nav__link">
+      Install
+    </a>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item">
+    <a href="../read/" title="Read" class="md-nav__link">
+      Read
+    </a>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item">
+    <a href="../write/" title="Write/Update" class="md-nav__link">
+      Write/Update
+    </a>
+  </li>
+
+    
+      
+      
+      
+
+  
+
+
+  <li class="md-nav__item md-nav__item--active">
+    
+    <input class="md-toggle md-nav__toggle" data-md-toggle="toc" type="checkbox" id="toc">
+    
+    
+      <label class="md-nav__link md-nav__link--active" for="toc">
+        Delete
+      </label>
+    
+    <a href="./" title="Delete" class="md-nav__link md-nav__link--active">
+      Delete
+    </a>
+    
+      
+<nav class="md-nav md-nav--secondary">
+  
+  
+  
+    <label class="md-nav__title" for="toc">Table of contents</label>
+    <ul class="md-nav__list" data-md-scrollfix>
+      
+        <li class="md-nav__item">
+  <a href="#to-stdout" title="To Stdout" class="md-nav__link">
+    To Stdout
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#from-stdin" title="From STDIN" class="md-nav__link">
+    From STDIN
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#deleting-array-elements" title="Deleting array elements" class="md-nav__link">
+    Deleting array elements
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#deleting-nodes-in-place" title="Deleting nodes in-place" class="md-nav__link">
+    Deleting nodes in-place
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#keys-with-dots" title="Keys with dots" class="md-nav__link">
+    Keys with dots
+  </a>
+  
+</li>
+      
+      
+      
+    </ul>
+  
+</nav>
+    
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item">
+    <a href="../create/" title="Create" class="md-nav__link">
+      Create
+    </a>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item">
+    <a href="../convert/" title="Convert" class="md-nav__link">
+      Convert
+    </a>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item">
+    <a href="../merge/" title="Merge" class="md-nav__link">
+      Merge
+    </a>
+  </li>
+
+    
+  </ul>
+</nav>
+                  </div>
+                </div>
+              </div>
+            
+            
+              <div class="md-sidebar md-sidebar--secondary" data-md-component="toc">
+                <div class="md-sidebar__scrollwrap">
+                  <div class="md-sidebar__inner">
+                    
+<nav class="md-nav md-nav--secondary">
+  
+  
+  
+    <label class="md-nav__title" for="toc">Table of contents</label>
+    <ul class="md-nav__list" data-md-scrollfix>
+      
+        <li class="md-nav__item">
+  <a href="#to-stdout" title="To Stdout" class="md-nav__link">
+    To Stdout
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#from-stdin" title="From STDIN" class="md-nav__link">
+    From STDIN
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#deleting-array-elements" title="Deleting array elements" class="md-nav__link">
+    Deleting array elements
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#deleting-nodes-in-place" title="Deleting nodes in-place" class="md-nav__link">
+    Deleting nodes in-place
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#keys-with-dots" title="Keys with dots" class="md-nav__link">
+    Keys with dots
+  </a>
+  
+</li>
+      
+      
+      
+    </ul>
+  
+</nav>
+                  </div>
+                </div>
+              </div>
+            
+          
+          <div class="md-content">
+            <article class="md-content__inner md-typeset">
+              
+                
+                  <a href="https://github.com/mikefarah/yq/edit/master/docs/delete.md" title="Edit this page" class="md-icon md-content__icon">&#xE3C9;</a>
+                
+                
+                  <h1>Delete</h1>
+                
+                <pre><code>yq d &lt;yaml_file|json_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:
+  c: 2
+  apples: green
+</code></pre>
+
+<p>then</p>
+<pre><code class="bash">yq d sample.yaml b.c
+</code></pre>
+
+<p>will output:</p>
+<pre><code class="yaml">b:
+  apples: green
+</code></pre>
+
+<h3 id="from-stdin">From STDIN<a class="headerlink" href="#from-stdin" title="Permanent link">&para;</a></h3>
+<pre><code class="bash">cat sample.yaml | yq d - b.c
+</code></pre>
+
+<h3 id="deleting-array-elements">Deleting array elements<a class="headerlink" href="#deleting-array-elements" title="Permanent link">&para;</a></h3>
+<p>Given a sample.yaml file of:</p>
+<pre><code class="yaml">b:
+  c: 
+    - 1
+    - 2
+    - 3
+</code></pre>
+
+<p>then</p>
+<pre><code class="bash">yq d sample.yaml 'b.c[1]'
+</code></pre>
+
+<p>will output:</p>
+<pre><code class="yaml">b:
+  c:
+  - 1
+  - 3
+</code></pre>
+
+<h3 id="deleting-nodes-in-place">Deleting nodes in-place<a class="headerlink" href="#deleting-nodes-in-place" title="Permanent link">&para;</a></h3>
+<p>Given a sample.yaml file of:</p>
+<pre><code class="yaml">b:
+  c: 2
+  apples: green
+</code></pre>
+
+<p>then</p>
+<pre><code class="bash">yq d -i sample.yaml b.c
+</code></pre>
+
+<p>will update the sample.yaml file so that the 'c' node is deleted</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:
+  foo.bar: 7
+</code></pre>
+
+<pre><code class="bash">yaml r sample.yaml 'b[foo.bar]'
+</code></pre>
+
+<pre><code class="bash">yaml w sample.yaml 'b[foo.bar]' 9
+</code></pre>
+
+<p>Any valid yaml key can be specified as part of a key lookup.</p>
+<p>Note that the path is in quotes to avoid the square brackets being interpreted by your shell.</p>
+                
+                  
+                
+              
+              
+                
+              
+            </article>
+          </div>
+        </div>
+      </main>
+      
+        
+<footer class="md-footer">
+  
+    <div class="md-footer-nav">
+      <nav class="md-footer-nav__inner md-grid">
+        
+          <a href="../write/" title="Write/Update" class="md-flex md-footer-nav__link md-footer-nav__link--prev" rel="prev">
+            <div class="md-flex__cell md-flex__cell--shrink">
+              <i class="md-icon md-icon--arrow-back md-footer-nav__button"></i>
+            </div>
+            <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title">
+              <span class="md-flex__ellipsis">
+                <span class="md-footer-nav__direction">
+                  Previous
+                </span>
+                Write/Update
+              </span>
+            </div>
+          </a>
+        
+        
+          <a href="../create/" title="Create" class="md-flex md-footer-nav__link md-footer-nav__link--next" rel="next">
+            <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title">
+              <span class="md-flex__ellipsis">
+                <span class="md-footer-nav__direction">
+                  Next
+                </span>
+                Create
+              </span>
+            </div>
+            <div class="md-flex__cell md-flex__cell--shrink">
+              <i class="md-icon md-icon--arrow-forward md-footer-nav__button"></i>
+            </div>
+          </a>
+        
+      </nav>
+    </div>
+  
+  <div class="md-footer-meta md-typeset">
+    <div class="md-footer-meta__inner md-grid">
+      <div class="md-footer-copyright">
+        
+        powered by
+        <a href="http://www.mkdocs.org">MkDocs</a>
+        and
+        <a href="https://squidfunk.github.io/mkdocs-material/">
+          Material for MkDocs</a>
+      </div>
+      
+        
+  <div class="md-footer-social">
+    
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
+    
+      <a href="https://github.com/mikefarah" class="md-footer-social__link fa fa-github"></a>
+    
+      <a href="https://www.linkedin.com/in/mike-farah-b5a75b2/" class="md-footer-social__link fa fa-linkedin"></a>
+    
+  </div>
+
+      
+    </div>
+  </div>
+</footer>
+      
+    </div>
+    
+      <script src="../assets/javascripts/application.6cdc17f0.js"></script>
+      
+      <script>app.initialize({version:"0.17.2",url:{base:".."}})</script>
+      
+    
+    
+      
+    
+  </body>
+</html>

docs/index.html

@@ -274,6 +274,18 @@
       
 
 
+  <li class="md-nav__item">
+    <a href="delete/" title="Delete" class="md-nav__link">
+      Delete
+    </a>
+  </li>
+
+    
+      
+      
+      
+
+
   <li class="md-nav__item">
     <a href="create/" title="Create" class="md-nav__link">
       Create
@@ -361,6 +373,12 @@
 <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
 </code></pre>

docs/merge/index.html

@@ -238,6 +238,18 @@
       
 
 
+  <li class="md-nav__item">
+    <a href="../delete/" title="Delete" class="md-nav__link">
+      Delete
+    </a>
+  </li>
+
+    
+      
+      
+      
+
+
   <li class="md-nav__item">
     <a href="../create/" title="Create" class="md-nav__link">
       Create

docs/read/index.html

@@ -256,13 +256,6 @@
     Splat
   </a>
   
-</li>
-      
-        <li class="md-nav__item">
-  <a href="#handling-in-the-yaml-key" title="Handling '.' in the yaml key" class="md-nav__link">
-    Handling '.' in the yaml key
-  </a>
-  
 </li>
       
         <li class="md-nav__item">
@@ -312,6 +305,18 @@
       
 
 
+  <li class="md-nav__item">
+    <a href="../delete/" title="Delete" class="md-nav__link">
+      Delete
+    </a>
+  </li>
+
+    
+      
+      
+      
+
+
   <li class="md-nav__item">
     <a href="../create/" title="Create" class="md-nav__link">
       Create
@@ -380,13 +385,6 @@
     Splat
   </a>
   
-</li>
-      
-        <li class="md-nav__item">
-  <a href="#handling-in-the-yaml-key" title="Handling '.' in the yaml key" class="md-nav__link">
-    Handling '.' in the yaml key
-  </a>
-  
 </li>
       
         <li class="md-nav__item">
@@ -469,17 +467,6 @@ bob:
 - apples
 </code></pre>
 
-<h3 id="handling-in-the-yaml-key">Handling '.' in the yaml key<a class="headerlink" href="#handling-in-the-yaml-key" title="Permanent link">&para;</a></h3>
-<p>Given a sample.yaml file of:</p>
-<pre><code class="yaml">b.x:
-  c: 2
-</code></pre>
-
-<p>then</p>
-<pre><code class="bash">yq r sample.yaml \&quot;b.x\&quot;.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 github.com/mikefarah/yq\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 github.com/mikefarah/yq  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\nHandling '.' in the yaml key\n\u00b6\n\n\nGiven a sample.yaml file of:\n\n\nb.x:\n  c: 2\n\n\n\n\nthen\n\n\nyq r sample.yaml \\\"b.x\\\".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.",
+            "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.",
             "title": "Read"
         },
         {
@@ -35,11 +35,6 @@
             "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/#handling-in-the-yaml-key",
-            "text": "Given a sample.yaml file of:  b.x:\n  c: 2  then  yq r sample.yaml \\\"b.x\\\".c  will output the value of '2'.",
-            "title": "Handling '.' in the yaml key"
-        },
         {
             "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.",
@@ -100,6 +95,36 @@
             "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.",
             "title": "Keys with dots"
         },
+        {
+            "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.",
+            "title": "Delete"
+        },
+        {
+            "location": "/delete/#to-stdout",
+            "text": "Given a sample.yaml file of:  b:\n  c: 2\n  apples: green  then  yq d sample.yaml b.c  will output:  b:\n  apples: green",
+            "title": "To Stdout"
+        },
+        {
+            "location": "/delete/#from-stdin",
+            "text": "cat sample.yaml | yq d - b.c",
+            "title": "From STDIN"
+        },
+        {
+            "location": "/delete/#deleting-array-elements",
+            "text": "Given a sample.yaml file of:  b:\n  c: \n    - 1\n    - 2\n    - 3  then  yq d sample.yaml 'b.c[1]'  will output:  b:\n  c:\n  - 1\n  - 3",
+            "title": "Deleting array elements"
+        },
+        {
+            "location": "/delete/#deleting-nodes-in-place",
+            "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/#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.",
+            "title": "Keys with dots"
+        },
         {
             "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.",

docs/sitemap.xml

@@ -4,7 +4,7 @@
     
     <url>
      <loc>/</loc>
-     <lastmod>2018-02-28</lastmod>
+     <lastmod>2018-06-12</lastmod>
      <changefreq>daily</changefreq>
     </url>
     
@@ -12,7 +12,7 @@
     
     <url>
      <loc>/read/</loc>
-     <lastmod>2018-02-28</lastmod>
+     <lastmod>2018-06-12</lastmod>
      <changefreq>daily</changefreq>
     </url>
     
@@ -20,7 +20,15 @@
     
     <url>
      <loc>/write/</loc>
-     <lastmod>2018-02-28</lastmod>
+     <lastmod>2018-06-12</lastmod>
+     <changefreq>daily</changefreq>
+    </url>
+    
+
+    
+    <url>
+     <loc>/delete/</loc>
+     <lastmod>2018-06-12</lastmod>
      <changefreq>daily</changefreq>
     </url>
     
@@ -28,7 +36,7 @@
     
     <url>
      <loc>/create/</loc>
-     <lastmod>2018-02-28</lastmod>
+     <lastmod>2018-06-12</lastmod>
      <changefreq>daily</changefreq>
     </url>
     
@@ -36,7 +44,7 @@
     
     <url>
      <loc>/convert/</loc>
-     <lastmod>2018-02-28</lastmod>
+     <lastmod>2018-06-12</lastmod>
      <changefreq>daily</changefreq>
     </url>
     
@@ -44,7 +52,7 @@
     
     <url>
      <loc>/merge/</loc>
-     <lastmod>2018-02-28</lastmod>
+     <lastmod>2018-06-12</lastmod>
      <changefreq>daily</changefreq>
     </url>
     

docs/write/index.html

@@ -319,6 +319,18 @@
       
 
 
+  <li class="md-nav__item">
+    <a href="../delete/" title="Delete" class="md-nav__link">
+      Delete
+    </a>
+  </li>
+
+    
+      
+      
+      
+
+
   <li class="md-nav__item">
     <a href="../create/" title="Create" class="md-nav__link">
       Create
@@ -603,13 +615,13 @@ b.e[0].name: Howdy Partner
           </a>
         
         
-          <a href="../create/" title="Create" class="md-flex md-footer-nav__link md-footer-nav__link--next" rel="next">
+          <a href="../delete/" title="Delete" class="md-flex md-footer-nav__link md-footer-nav__link--next" rel="next">
             <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title">
               <span class="md-flex__ellipsis">
                 <span class="md-footer-nav__direction">
                   Next
                 </span>
-                Create
+                Delete
               </span>
             </div>
             <div class="md-flex__cell md-flex__cell--shrink">

examples/multiple_docs.yaml

@@ -0,0 +1,15 @@
+a: Easy! as one two three
+b:
+  c: 2
+  d: [3, 4]
+  e:
+    - name: fred
+      value: 3
+    - name: sam
+      value: 4
+---
+another:
+  document: here
+---
+wow: 
+  - here is another

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

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.yml

@@ -6,6 +6,7 @@ pages:
     - Install: index.md
     - Read: read.md
     - Write/Update: write.md
+    - Delete: delete.md
     - Create: create.md
     - Convert: convert.md
     - Merge: merge.md

mkdocs/delete.md

@@ -0,0 +1,63 @@
+```
+yq d <yaml_file|json_file> <path_to_delete>
+```
+{!snippets/works_with_json.md!}
+
+### To Stdout
+Given a sample.yaml file of:
+```yaml
+b:
+  c: 2
+  apples: green
+```
+then
+```bash
+yq d sample.yaml b.c
+```
+will output:
+```yaml
+b:
+  apples: green
+```
+
+### From STDIN
+```bash
+cat sample.yaml | yq d - b.c
+```
+
+### Deleting array elements
+Given a sample.yaml file of:
+```yaml
+b:
+  c: 
+    - 1
+    - 2
+    - 3
+```
+then
+```bash
+yq d sample.yaml 'b.c[1]'
+```
+will output:
+```yaml
+b:
+  c:
+  - 1
+  - 3
+```
+
+### Deleting nodes in-place
+Given a sample.yaml file of:
+```yaml
+b:
+  c: 2
+  apples: green
+```
+then
+```bash
+yq d -i sample.yaml b.c
+```
+will update the sample.yaml file so that the 'c' node is deleted
+
+
+{!snippets/keys_with_dots.md!}

mkdocs/index.md

@@ -12,6 +12,12 @@ 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

mkdocs/read.md

@@ -43,18 +43,6 @@ will output
 - apples
 ```
 
-### Handling '.' in the yaml key
-Given a sample.yaml file of:
-```yaml
-b.x:
-  c: 2
-```
-then
-```bash
-yq r sample.yaml \"b.x\".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

release_instructions.txt

@@ -0,0 +1,30 @@
+- 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
+
+- 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

@@ -1,39 +1,32 @@
 #!/bin/bash
-
+set -ex
 GITHUB_TOKEN="${GITHUB_TOKEN:?missing required input \'GITHUB_TOKEN\'}"
 
 CURRENT="$(git describe --tags --abbrev=0)"
 PREVIOUS="$(git describe --tags --abbrev=0 --always "${CURRENT}"^)"
 OWNER="mikefarah"
-REPO="yaml"
+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: 1.15.0
 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

@@ -41,19 +41,21 @@ func parseData(rawData string) yaml.MapSlice {
 }
 
 func assertResult(t *testing.T, expectedValue interface{}, actualValue interface{}) {
+	t.Helper()
 	if expectedValue != actualValue {
 		t.Error("Expected <", expectedValue, "> but got <", actualValue, ">", fmt.Sprintf("%T", actualValue))
 	}
 }
 
 func assertResultComplex(t *testing.T, expectedValue interface{}, actualValue interface{}) {
+	t.Helper()
 	if !reflect.DeepEqual(expectedValue, actualValue) {
 		t.Error("Expected <", expectedValue, "> but got <", actualValue, ">", fmt.Sprintf("%T", actualValue))
 	}
 }
 
 func assertResultWithContext(t *testing.T, expectedValue interface{}, actualValue interface{}, context interface{}) {
-
+	t.Helper()
 	if expectedValue != actualValue {
 		t.Error(context)
 		t.Error(": expected <", expectedValue, "> but got <", actualValue, ">")

vendor/vendor.json

@@ -20,6 +20,12 @@
 			"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",
@@ -33,10 +39,12 @@
 			"revisionTime": "2017-08-24T17:57:12Z"
 		},
 		{
-			"checksumSHA1": "RDJpJQwkF012L6m/2BJizyOksNw=",
+			"checksumSHA1": "DHNYKS5T54/XOqUsFFzdZMLEnVE=",
+			"origin": "github.com/mikefarah/yaml",
 			"path": "gopkg.in/yaml.v2",
-			"revision": "eb3733d160e74a9c7e442f435eb3bea458e1d19f",
-			"revisionTime": "2017-08-12T16:00:11Z"
+			"revision": "e175af14aaa1d0eff2ee04b691e4a4827a111416",
+			"revisionTime": "2018-06-13T04:05:11Z",
+			"tree": true
 		}
 	],
 	"rootPath": "github.com/mikefarah/yq"

version.go

@@ -11,16 +11,16 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "1.14.1"
+	Version = "2.0.0"
 
 	// 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
 	// such as "dev" (in development), "beta", "rc1", etc.
-	VersionPrerelease = ""
+	VersionPrerelease = "beta"
 )
 
 // ProductName is the name of the product
-const ProductName = "yaml"
+const ProductName = "yq"
 
 // GetVersionDisplay composes the parts of the version in a way that's suitable
 // for displaying to humans.

version_test.go

@@ -9,7 +9,7 @@ func TestGetVersionDisplay(t *testing.T) {
 	}{
 		{
 			name: "Display Version",
-			want: ProductName + " version " + Version + "\n",
+			want: ProductName + " version " + Version + "-" + VersionPrerelease + "\n",
 		},
 	}
 	for _, tt := range tests {

yq.go

@@ -1,13 +1,17 @@
 package main
 
 import (
-	"errors"
+	"bufio"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
+	"reflect"
 	"strconv"
 	"strings"
 
+	errors "github.com/pkg/errors"
+
 	logging "github.com/op/go-logging"
 	"github.com/spf13/cobra"
 	yaml "gopkg.in/yaml.v2"
@@ -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 {
@@ -64,42 +70,50 @@ func newCommandCLI() *cobra.Command {
 	rootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "verbose mode")
 	rootCmd.Flags().BoolVarP(&version, "version", "V", false, "Print version information and quit")
 
-	rootCmd.AddCommand(createReadCmd(), createWriteCmd(), createNewCmd(), createMergeCmd())
+	rootCmd.AddCommand(
+		createReadCmd(),
+		createWriteCmd(),
+		createDeleteCmd(),
+		createNewCmd(),
+		createMergeCmd(),
+	)
 	rootCmd.SetOutput(os.Stdout)
 
 	return rootCmd
 }
 
 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 document_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().IntVarP(&docIndex, "doc", "d", 0, "process document index number (0 based)")
+	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 document_index] sample.yaml a.b.c newValueForC",
 		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.
@@ -118,9 +132,31 @@ 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().IntVarP(&docIndex, "doc", "d", 0, "process document index number (0 based)")
 	return cmdWrite
 }
 
+func createDeleteCmd() *cobra.Command {
+	var cmdDelete = &cobra.Command{
+		Use:     "delete [yaml_file] [path]",
+		Aliases: []string{"d"},
+		Short:   "yq d [--inplace/-i] [--doc/-d document_index] sample.yaml a.b.c",
+		Example: `
+yq delete things.yaml a.b.c
+yq delete --inplace things.yaml a.b.c
+yq d -i things.yaml a.b.c
+yq d things.yaml a.b.c
+	`,
+		Long: `Deletes the given path from the YAML file.
+Outputs to STDOUT unless the inplace flag is used, in which case the file is updated instead.
+`,
+		RunE: deleteProperty,
+	}
+	cmdDelete.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the yaml file inplace")
+	cmdDelete.PersistentFlags().IntVarP(&docIndex, "doc", "d", 0, "process document index number (0 based)")
+	return cmdDelete
+}
+
 func createNewCmd() *cobra.Command {
 	var cmdNew = &cobra.Command{
 		Use:     "new [path] [value]",
@@ -147,7 +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 document_index] [--overwrite/-x] sample.yaml sample2.yaml",
 		Example: `
 yq merge things.yaml other.yaml
 yq merge --inplace things.yaml other.yaml
@@ -164,6 +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().IntVarP(&docIndex, "doc", "d", 0, "process document index number (0 based)")
 	return cmdMerge
 }
 
@@ -181,7 +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 {
@@ -189,67 +225,17 @@ 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{}
+	if err := readData(args[0], docIndex, &generalData); err != nil {
+		return nil, err
 	}
-
-	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 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:])
+	value, err := recurse(generalData, paths[0], paths[1:])
+	return value, err
 }
 
 func newProperty(cmd *cobra.Command, args []string) error {
@@ -266,127 +252,175 @@ 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
+}
+
+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
+
+		for {
+			log.Debugf("Read doc %v", currentIndex)
+			errorReading = decoder.Decode(&dataBucket)
+
+			if errorReading == io.EOF {
+				if currentIndex < docIndex {
+					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 updateData = func(dataBucket interface{}, currentIndex int) (interface{}, error) {
+		if currentIndex == docIndex {
+			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
+	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 {
+	if len(args) < 2 {
+		return errors.New("Must provide <filename> <path_to_delete>")
 	}
-	cmd.Println(dataStr)
-	return nil
+	var deletePath = args[1]
+	var paths = parsePath(deletePath)
+	var updateData = func(dataBucket interface{}, currentIndex int) (interface{}, error) {
+		if currentIndex == docIndex {
+			log.Debugf("Deleting path in doc %v", currentIndex)
+			return deleteChildValue(dataBucket, paths), nil
+		}
+		return dataBucket, 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")
 	}
+	var input = args[0]
+	var filesToMerge = args[1:]
 
-	updatedData, err := mergeYaml(args)
-	if err != nil {
-		return err
-	}
-	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 currentIndex == docIndex {
+			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{} {
@@ -429,7 +463,7 @@ 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)
@@ -441,22 +475,59 @@ func marshalContext(context interface{}) (string, error) {
 	return outStr, nil
 }
 
-func readData(filename string, parsedData interface{}) error {
+func safelyRenameFile(from string, to string) {
+	if err := os.Rename(from, to); err != nil {
+		log.Errorf("Error renaming from %v to %v", from, to)
+		log.Error(err.Error())
+	}
+}
+
+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 {
+		// naive implementation of document indexing, decodes all the yaml documents
+		// before the docIndex and throws them away.
+		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: