Add ldflags option to build

Added link to guide in request process

CONTRIBUTORS.md

@@ -27,3 +27,5 @@ Wails is what it is because of the time and effort given by these great people.
   * [Jarek](https://github.com/Jarek-SRT)
   * [Konez2k](https://github.com/konez2k)
   * [msms](https://github.com/sayuthisobri)
+  * [dedo1911](https://github.com/dedo1911)
+  * [Florian Didron](https://github.com/fdidron)

README.md

@@ -55,7 +55,7 @@ _Debian: 8, 9, 10_
 
 _Ubuntu: 16.04, 18.04, 19.04_
 
-_Also succesfully tested on: Zorin 15, Parrot 4.7, Linuxmint 19, Elementary 5, Kali, Neon_
+_Also succesfully tested on: Zorin 15, Parrot 4.7, Linuxmint 19, Elementary 5, Kali, Neon_, Pop!_OS
 
 #### Arch Linux / ArchLabs
 

cmd/helpers.go

@@ -561,6 +561,11 @@ func ldFlags(po *ProjectOptions, buildMode string) string {
 
 	ldflags += "-X github.com/wailsapp/wails.BuildMode=" + buildMode
 
+	// Add additional ldflags passed in via the `ldflags` cli flag
+	if len(po.LdFlags) > 0 {
+		ldflags += " " + po.LdFlags
+	}
+
 	// If we wish to generate typescript
 	if po.typescriptDefsFilename != "" {
 		cwd, err := os.Getwd()

cmd/linux.go

@@ -59,6 +59,10 @@ const (
 	Leap
 	// ArchLabs distribution
 	ArchLabs
+	// PopOS distribution
+	PopOS
+	// Solus distribution
+	Solus
 )
 
 // DistroInfo contains all the information relating to a linux distribution
@@ -107,7 +111,7 @@ func parseOsRelease(osRelease string) *DistroInfo {
 		}
 		switch splitLine[0] {
 		case "ID":
-			osID = strings.Trim(splitLine[1], "\"")
+			osID = strings.ToLower(strings.Trim(splitLine[1], "\""))
 		case "NAME":
 			osNAME = strings.Trim(splitLine[1], "\"")
 		case "VERSION_ID":
@@ -116,7 +120,7 @@ func parseOsRelease(osRelease string) *DistroInfo {
 	}
 
 	// Check distro name against list of distros
-	switch strings.ToLower(osID) {
+	switch osID {
 	case "fedora":
 		result.Distribution = Fedora
 	case "centos":
@@ -159,6 +163,10 @@ func parseOsRelease(osRelease string) *DistroInfo {
 		result.Distribution = Tumbleweed
 	case "opensuse-leap":
 		result.Distribution = Leap
+	case "pop":
+		result.Distribution = PopOS
+	case "solus":
+		result.Distribution = Solus
 	default:
 		result.Distribution = Unknown
 	}
@@ -195,6 +203,17 @@ func DpkgInstalled(packageName string) (bool, error) {
 	return exitCode == 0, nil
 }
 
+// EOpkgInstalled uses dpkg to see if a package is installed
+func EOpkgInstalled(packageName string) (bool, error) {
+	program := NewProgramHelper()
+	eopkg := program.FindProgram("eopkg")
+	if eopkg == nil {
+		return false, fmt.Errorf("cannot check dependencies: eopkg not found")
+	}
+	stdout, _, _, _ := eopkg.Run("info", packageName)
+	return strings.HasPrefix(stdout, "Installed"), nil
+}
+
 // PacmanInstalled uses pacman to see if a package is installed.
 func PacmanInstalled(packageName string) (bool, error) {
 	program := NewProgramHelper()
@@ -266,5 +285,9 @@ func RequestSupportForDistribution(distroInfo *DistroInfo) error {
 
 	fmt.Println("Opening browser to file request.")
 	browser.OpenURL(fullURL + url.PathEscape(params))
+	result = Prompt("We have a guide for adding support for your distribution. Would you like to view it?", "yes")
+	if strings.ToLower(result) == "yes" {
+		browser.OpenURL("https://wails.app/guides/distro/")
+	}
 	return nil
 }

cmd/linuxdb.yaml

@@ -28,6 +28,15 @@ distributions:
         gccversioncommand: &gccdumpfullversion -dumpfullversion
         programs: *debiandefaultprograms
         libraries: *debiandefaultlibraries
+  pop:
+    id: pop
+    releases:
+      default:
+        version: default
+        name: Pop!_OS
+        gccversioncommand: &gccdumpfullversion -dumpfullversion
+        programs: *debiandefaultprograms
+        libraries: *debiandefaultlibraries
   kali:
     id: kali
     releases:
@@ -232,6 +241,25 @@ distributions:
         gccversioncommand: *gccdumpfullversion
         programs: *debiandefaultprograms
         libraries: *debiandefaultlibraries
+  solus:
+    id: solus
+    releases:
+      default:
+        version: default
+        name: Solus
+        gccversioncommand: *gccdumpfullversion
+        programs: &solusdefaultprograms
+          - name: gcc
+            help: Please install with `sudo eopkg it -c system.devel` and try again
+          - name: pkg-config
+            help: Please install with `sudo eopkg it -c system.devel` and try again
+          - name: npm
+            help: Please install with `sudo eopkg it nodejs` and try again
+        libraries: &solusdefaultlibraries
+          - name: libgtk-3-devel
+            help: Please install with `sudo eopkg it libgtk-3-devel` and try again
+          - name: libwebkit-gtk-devel
+            help: Please install with `sudo eopkg it libwebkit-gtk-devel` and try again
         
   opensuse-tumbleweed:
     id: opensuse-tumbleweed

cmd/package.go

@@ -1,9 +1,12 @@
 package cmd
 
 import (
+	"bufio"
 	"bytes"
+	"encoding/binary"
 	"fmt"
 	"image"
+	"image/png"
 	"io/ioutil"
 	"os"
 	"path"
@@ -14,6 +17,7 @@ import (
 	"time"
 
 	"github.com/jackmordaunt/icns"
+	"golang.org/x/image/draw"
 )
 
 // PackageHelper helps with the 'wails package' command
@@ -55,6 +59,111 @@ func newPlistData(title, exe, packageID, version, author string) *plistData {
 	}
 }
 
+type windowsIcoHeader struct {
+	_          uint16
+	imageType  uint16
+	imageCount uint16
+}
+
+type windowsIcoDescriptor struct {
+	width   uint8
+	height  uint8
+	colours uint8
+	_       uint8
+	planes  uint16
+	bpp     uint16
+	size    uint32
+	offset  uint32
+}
+
+type windowsIcoContainer struct {
+	Header windowsIcoDescriptor
+	Data   []byte
+}
+
+func generateWindowsIcon(pngFilename string, iconfile string) error {
+	sizes := []int{256, 128, 64, 48, 32, 16}
+
+	pngfile, err := os.Open(pngFilename)
+	if err != nil {
+		return err
+	}
+	defer pngfile.Close()
+
+	pngdata, err := png.Decode(pngfile)
+	if err != nil {
+		return err
+	}
+
+	icons := []windowsIcoContainer{}
+
+	for _, size := range sizes {
+		rect := image.Rect(0, 0, int(size), int(size))
+		rawdata := image.NewRGBA(rect)
+		scale := draw.CatmullRom
+		scale.Scale(rawdata, rect, pngdata, pngdata.Bounds(), draw.Over, nil)
+
+		icondata := new(bytes.Buffer)
+		writer := bufio.NewWriter(icondata)
+		err = png.Encode(writer, rawdata)
+		if err != nil {
+			return err
+		}
+		writer.Flush()
+
+		imgSize := size
+		if imgSize >= 256 {
+			imgSize = 0
+		}
+
+		data := icondata.Bytes()
+
+		icn := windowsIcoContainer{
+			Header: windowsIcoDescriptor{
+				width:  uint8(imgSize),
+				height: uint8(imgSize),
+				planes: 1,
+				bpp:    32,
+				size:   uint32(len(data)),
+			},
+			Data: data,
+		}
+		icons = append(icons, icn)
+	}
+
+	outfile, err := os.Create(iconfile)
+	if err != nil {
+		return err
+	}
+	defer outfile.Close()
+
+	ico := windowsIcoHeader{
+		imageType:  1,
+		imageCount: uint16(len(sizes)),
+	}
+	err = binary.Write(outfile, binary.LittleEndian, ico)
+	if err != nil {
+		return err
+	}
+
+	offset := uint32(6 + 16*len(sizes))
+	for _, icon := range icons {
+		icon.Header.offset = offset
+		err = binary.Write(outfile, binary.LittleEndian, icon.Header)
+		if err != nil {
+			return err
+		}
+		offset += icon.Header.size
+	}
+	for _, icon := range icons {
+		_, err = outfile.Write(icon.Data)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func defaultString(val string, defaultVal string) string {
 	if val != "" {
 		return val
@@ -177,14 +286,16 @@ func (b *PackageHelper) PackageWindows(po *ProjectOptions, cleanUp bool) error {
 	outputDir := b.fs.Cwd()
 	basename := strings.TrimSuffix(po.BinaryName, ".exe")
 
-	// Copy icon
+	// Copy default icon if needed
-	tgtIconFile := filepath.Join(outputDir, basename+".ico")
+	icon, err := b.copyIcon()
-	if !b.fs.FileExists(tgtIconFile) {
+	if err != nil {
-		srcIconfile := filepath.Join(b.getPackageFileBaseDir(), "wails.ico")
+		return err
-		err := b.fs.CopyFile(srcIconfile, tgtIconFile)
+	}
-		if err != nil {
+
-			return err
+	// Generate icon from PNG
-		}
+	err = generateWindowsIcon(icon, po.BinaryName+".ico")
+	if err != nil {
+		return err
 	}
 
 	// Copy manifest
@@ -243,7 +354,7 @@ func (b *PackageHelper) PackageWindows(po *ProjectOptions, cleanUp bool) error {
 	return nil
 }
 
-func (b *PackageHelper) copyIcon(resourceDir string) (string, error) {
+func (b *PackageHelper) copyIcon() (string, error) {
 
 	// TODO: Read this from project.json
 	const appIconFilename = "appicon.png"
@@ -268,7 +379,7 @@ func (b *PackageHelper) copyIcon(resourceDir string) (string, error) {
 
 func (b *PackageHelper) packageIconOSX(resourceDir string) error {
 
-	srcIcon, err := b.copyIcon(resourceDir)
+	srcIcon, err := b.copyIcon()
 	if err != nil {
 		return err
 	}

cmd/packages/windows/wails.rc

@@ -1,2 +1,2 @@
 100 ICON    "$NAME$.ico"
-100 24      "$NAME$.exe.manifest"
+110 24      "$NAME$.exe.manifest"

cmd/project.go

@@ -161,6 +161,7 @@ type ProjectOptions struct {
 	CrossCompile           bool
 	Platform               string
 	Architecture           string
+	LdFlags                string
 }
 
 // Defaults sets the default project template

cmd/system.go

@@ -274,7 +274,7 @@ func CheckDependencies(logger *Logger) (bool, error) {
 		distroInfo := GetLinuxDistroInfo()
 
 		switch distroInfo.Distribution {
-		case Ubuntu, Debian, Zorin, Parrot, Linuxmint, Elementary, Kali, Neon, Deepin, Raspbian:
+		case Ubuntu, Debian, Zorin, Parrot, Linuxmint, Elementary, Kali, Neon, Deepin, Raspbian, PopOS:
 			libraryChecker = DpkgInstalled
 		case Arch, ArcoLinux, ArchLabs, Manjaro, ManjaroARM:
 			libraryChecker = PacmanInstalled
@@ -284,6 +284,8 @@ func CheckDependencies(logger *Logger) (bool, error) {
 			libraryChecker = EqueryInstalled
 		case VoidLinux:
 			libraryChecker = XbpsInstalled
+		case Solus:
+			libraryChecker = EOpkgInstalled
 		default:
 			return false, RequestSupportForDistribution(distroInfo)
 		}

cmd/templates/vanilla/README.md

@@ -0,0 +1,5 @@
+# README
+
+This is an experimental template for vanilla HTML/JS/CSS.
+
+The webpack rules may need to be adjusted to correctly embed all assets. Babel may also need to be setup correctly.

cmd/templates/vanilla/frontend/package.json.template

@@ -0,0 +1,42 @@
+{
+  "name": "vanilla",
+  "author": "Lea<l>",
+  "private": true,
+  "scripts": {
+    "serve": "webpack-dev-server",
+    "build": "npx webpack"
+  },
+  "dependencies": {
+    "core-js": "^3.6.4",
+    "regenerator-runtime": "^0.13.3",
+    "@wailsapp/runtime": "^1.0.10"
+  },
+  "devDependencies": {
+    "babel-eslint": "^10.1.0",
+    "copy-webpack-plugin": "^6.0.2",
+    "eslint": "^6.8.0",
+    "eventsource-polyfill": "^0.9.6",
+    "webpack": "^4.43.0",
+    "webpack-cli": "^3.3.11",
+    "webpack-dev-server": "^3.11.0",
+    "webpack-hot-middleware": "^2.25.0"
+  },
+  "eslintConfig": {
+    "root": true,
+    "env": {
+      "node": true
+    },
+    "extends": [
+      "eslint:recommended"
+    ],
+    "rules": {},
+    "parserOptions": {
+      "parser": "babel-eslint"
+    }
+  },
+  "browserslist": [
+    "> 1%",
+    "last 2 versions",
+    "not ie <= 8"
+  ]
+}

cmd/templates/vanilla/frontend/src/index.html

@@ -0,0 +1,9 @@
+<html>
+    <head>
+        <link rel="stylesheet" type="text/css" href="main.css">
+    </head>
+    <body>
+        <div id="app"></div>
+        <script src="main.js"></script>
+    </body>
+</html>

cmd/templates/vanilla/frontend/src/main.js

@@ -0,0 +1,28 @@
+
+const runtime = require('@wailsapp/runtime');
+
+// We need to wait for runtime.Init to complete before 
+// running our JS
+runtime.Init(() => {
+
+	// Ensure the default app div is 100% wide/high
+	var app = document.getElementById('app');
+	app.style.width = '100%';
+	app.style.height = '100%';
+
+	// Inject html
+	app.innerHTML = `
+	<div class='logo'></div>
+	<div class='container'>
+			<button id='button'>Click Me!</button>
+			<div id='result'/>
+	</div>
+	`;
+
+	// Connect button to Go method
+	document.getElementById('button').onclick = () => {
+		window.backend.basic().then((result) => {
+			document.getElementById('result').innerText = result;
+		})
+	} 
+});

cmd/templates/vanilla/frontend/webpack.config.js

@@ -0,0 +1,56 @@
+const path = require('path');
+const CopyWebpackPlugin = require('copy-webpack-plugin');
+
+let imageSizeLimit = 9007199254740991; // Number.MAX_SAFE_INTEGER
+let sourceDir = path.resolve(__dirname, 'src');
+let buildDir = path.resolve(__dirname, 'build');
+
+module.exports = {
+	entry: {
+		index: path.resolve(sourceDir, 'main.js')
+	},
+	output: {
+		path: buildDir,
+		filename: 'main.js'
+	},
+	optimization: {
+		splitChunks: false
+	},
+	devServer: {
+		disableHostCheck: true,
+		contentBase: path.join(__dirname, 'src'),
+		compress: true,
+		open: true,
+		port: 8090
+	},
+	mode: 'production',
+	module: {
+		rules: [
+			{
+				test: /\.(png|gif|jpg|woff2?|eot|ttf|otf|svg)(\?.*)?$/i,
+				use: [
+					{
+						loader: 'url-loader',
+						options: {
+							limit: imageSizeLimit
+						}
+					}
+				],
+			}
+		]
+	},
+	plugins: [
+		new CopyWebpackPlugin({
+			patterns: [
+				{
+					from: path.resolve(sourceDir, 'main.css'),
+					to: path.resolve(buildDir, 'main.css')
+				},
+				{
+					from: path.resolve(sourceDir, 'index.html'),
+					to: path.resolve(buildDir, 'index.html')
+				},
+			]
+		})
+	]
+};

cmd/templates/vanilla/go.mod.template

@@ -0,0 +1,5 @@
+module {{.BinaryName}}
+
+require (
+	github.com/wailsapp/wails {{.WailsVersion}}
+)

cmd/templates/vanilla/main.go.template

@@ -0,0 +1,27 @@
+package main
+
+import (
+  "github.com/leaanthony/mewn"
+  "github.com/wailsapp/wails"
+)
+
+func basic() string {
+  return "Hello World!"
+}
+
+func main() {
+
+	js := mewn.String("./frontend/build/main.js")
+	css := mewn.String("./frontend/build/main.css")
+
+  app := wails.CreateApp(&wails.AppConfig{
+    Width:  1024,
+    Height: 768,
+    Title:  "{{.Name}}",
+    JS:     js,
+    CSS:    css,
+    Colour: "#131313",
+  })
+  app.Bind(basic)
+  app.Run()
+}

cmd/templates/vanilla/template.json

@@ -0,0 +1,12 @@
+{
+  "name": "Vanilla",
+  "shortdescription": "A Vanilla HTML/JS template",
+  "description": "A basic template using plain html/js and bundled using Webpack 4",
+  "author": "Lea Anthony<lea.anthony@gmail.com>",
+  "created": "2020-06-14",
+  "frontenddir": "frontend",
+  "install": "npm install",
+  "build": "npm run build",
+  "serve": "npm run serve",
+  "bridge": "src"
+}

cmd/version.go

@@ -1,4 +1,4 @@
 package cmd
 
 // Version - Wails version
-const Version = "v1.6.0-pre2"
+const Version = "v1.6.0"

cmd/wails/4_build.go

@@ -29,6 +29,7 @@ func init() {
 	var typescriptFilename = ""
 	var verbose = false
 	var platform = ""
+	var ldflags = ""
 
 	buildSpinner := spinner.NewSpinner()
 	buildSpinner.SetSpinSpeed(50)
@@ -40,7 +41,8 @@ func init() {
 		BoolFlag("f", "Force rebuild of application components", &forceRebuild).
 		BoolFlag("d", "Build in Debug mode", &debugMode).
 		BoolFlag("verbose", "Verbose output", &verbose).
-		StringFlag("t", "Generate Typescript definitions to given file (at runtime)", &typescriptFilename)
+		StringFlag("t", "Generate Typescript definitions to given file (at runtime)", &typescriptFilename).
+		StringFlag("ldflags", "Extra options for -ldflags", &ldflags)
 
 	var b strings.Builder
 	for _, plat := range getSupportedPlatforms() {
@@ -84,7 +86,7 @@ func init() {
 				}
 			}
 			if !supported {
-				return fmt.Errorf("Unsupported platform '%s' specified.\nPlease run `wails build -h` to see the supported platform/architecture options.", platform)
+				return fmt.Errorf("unsupported platform '%s' specified.\nPlease run `wails build -h` to see the supported platform/architecture options", platform)
 			}
 
 			projectOptions.CrossCompile = true
@@ -93,6 +95,9 @@ func init() {
 			projectOptions.Architecture = plat[1]
 		}
 
+		// Add ldflags
+		projectOptions.LdFlags = ldflags
+
 		// Validate config
 		// Check if we have a frontend
 		err = cmd.ValidateFrontendConfig(projectOptions)

cmd/wails/6_serve.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"runtime"
 
 	"github.com/leaanthony/spinner"
 	"github.com/wailsapp/wails/cmd"
@@ -34,7 +35,6 @@ func init() {
 
 		// Project options
 		projectOptions := &cmd.ProjectOptions{}
-		projectOptions.Verbose = verbose
 
 		// Check we are in project directory
 		// Check project.json loads correctly
@@ -44,6 +44,10 @@ func init() {
 			return err
 		}
 
+		// Set project options
+		projectOptions.Verbose = verbose
+		projectOptions.Platform = runtime.GOOS
+
 		// Save project directory
 		projectDir := fs.Cwd()
 

go.mod

@@ -22,6 +22,7 @@ require (
 	github.com/stretchr/testify v1.3.0 // indirect
 	github.com/syossan27/tebata v0.0.0-20180602121909-b283fe4bc5ba
 	golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529 // indirect
+	golang.org/x/image v0.0.0-20200430140353-33d19683fad8
 	golang.org/x/net v0.0.0-20190509222800-a4d6f7feada5 // indirect
 	golang.org/x/sys v0.0.0-20190509141414-a5b02f93d862
 	golang.org/x/text v0.3.0

go.sum

@@ -70,6 +70,8 @@ golang.org/x/crypto v0.0.0-20190123085648-057139ce5d2b/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529 h1:iMGN4xG0cnqj3t+zOM8wUB0BiPKHEwSxEZCvzcbZuvk=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/image v0.0.0-20200430140353-33d19683fad8 h1:6WW6V3x1P/jokJBpRQYUJnMHRP6isStQwCozxnU7XQw=
+golang.org/x/image v0.0.0-20200430140353-33d19683fad8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190509222800-a4d6f7feada5 h1:6M3SDHlHHDCx2PcQw3S4KsR170vGqDhJDOmpVd4Hjak=
 golang.org/x/net v0.0.0-20190509222800-a4d6f7feada5/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=

lib/interfaces/renderer.go

@@ -17,9 +17,9 @@ type Renderer interface {
 	NotifyEvent(eventData *messages.EventData) error
 
 	// Dialog Runtime
-	SelectFile() string
+	SelectFile(title string, filter string) string
 	SelectDirectory() string
-	SelectSaveFile() string
+	SelectSaveFile(title string, filter string) string
 
 	// Window Runtime
 	SetColour(string) error

lib/renderer/bridge/bridge.go

@@ -114,7 +114,7 @@ func (h *Bridge) NewBinding(methodName string) error {
 
 // SelectFile is unsupported for Bridge but required
 // for the Renderer interface
-func (h *Bridge) SelectFile() string {
+func (h *Bridge) SelectFile(title string, filter string) string {
 	h.log.Warn("SelectFile() unsupported in bridge mode")
 	return ""
 }
@@ -128,7 +128,7 @@ func (h *Bridge) SelectDirectory() string {
 
 // SelectSaveFile is unsupported for Bridge but required
 // for the Renderer interface
-func (h *Bridge) SelectSaveFile() string {
+func (h *Bridge) SelectSaveFile(title string, filter string) string {
 	h.log.Warn("SelectSaveFile() unsupported in bridge mode")
 	return ""
 }

lib/renderer/webview.go

@@ -245,7 +245,7 @@ func (w *WebView) NewBinding(methodName string) error {
 }
 
 // SelectFile opens a dialog that allows the user to select a file
-func (w *WebView) SelectFile() string {
+func (w *WebView) SelectFile(title string, filter string) string {
 	var result string
 
 	// We need to run this on the main thread, however Dispatch is
@@ -255,7 +255,7 @@ func (w *WebView) SelectFile() string {
 	wg.Add(1)
 	go func() {
 		w.window.Dispatch(func() {
-			result = w.window.Dialog(wv.DialogTypeOpen, 0, "Select File", "")
+			result = w.window.Dialog(wv.DialogTypeOpen, 0, title, "", filter)
 			wg.Done()
 		})
 	}()
@@ -273,7 +273,7 @@ func (w *WebView) SelectDirectory() string {
 	wg.Add(1)
 	go func() {
 		w.window.Dispatch(func() {
-			result = w.window.Dialog(wv.DialogTypeOpen, wv.DialogFlagDirectory, "Select Directory", "")
+			result = w.window.Dialog(wv.DialogTypeOpen, wv.DialogFlagDirectory, "Select Directory", "", "")
 			wg.Done()
 		})
 	}()
@@ -282,7 +282,7 @@ func (w *WebView) SelectDirectory() string {
 }
 
 // SelectSaveFile opens a dialog that allows the user to select a file to save
-func (w *WebView) SelectSaveFile() string {
+func (w *WebView) SelectSaveFile(title string, filter string) string {
 	var result string
 	// We need to run this on the main thread, however Dispatch is
 	// non-blocking so we launch this in a goroutine and wait for
@@ -291,7 +291,7 @@ func (w *WebView) SelectSaveFile() string {
 	wg.Add(1)
 	go func() {
 		w.window.Dispatch(func() {
-			result = w.window.Dialog(wv.DialogTypeSave, 0, "Save file", "")
+			result = w.window.Dialog(wv.DialogTypeSave, 0, title, "", filter)
 			wg.Done()
 		})
 	}()

lib/renderer/webview/webview.go

@@ -74,9 +74,9 @@ static inline void CgoWebViewSetColor(void *w, uint8_t r, uint8_t g, uint8_t b,
 }
 
 static inline void CgoDialog(void *w, int dlgtype, int flags,
-		char *title, char *arg, char *res, size_t ressz) {
+char *title, char *arg, char *res, size_t ressz, char *filter) {
 	webview_dialog(w, dlgtype, flags,
-		(const char*)title, (const char*) arg, res, ressz);
+	(const char*)title, (const char*) arg, res, ressz, filter);
 }
 
 static inline int CgoWebViewEval(void *w, char *js) {
@@ -186,7 +186,7 @@ type WebView interface {
 	// Dialog() opens a system dialog of the given type and title. String
 	// argument can be provided for certain dialogs, such as alert boxes. For
 	// alert boxes argument is a message inside the dialog box.
-	Dialog(dlgType DialogType, flags int, title string, arg string) string
+	Dialog(dlgType DialogType, flags int, title string, arg string, filter string) string
 	// Terminate() breaks the main UI loop. This method must be called from the main thread
 	// only. See Dispatch() for more details.
 	Terminate()
@@ -311,7 +311,7 @@ func (w *webview) SetFullscreen(fullscreen bool) {
 	C.CgoWebViewSetFullscreen(w.w, C.int(boolToInt(fullscreen)))
 }
 
-func (w *webview) Dialog(dlgType DialogType, flags int, title string, arg string) string {
+func (w *webview) Dialog(dlgType DialogType, flags int, title string, arg string, filter string) string {
 	const maxPath = 4096
 	titlePtr := C.CString(title)
 	defer C.free(unsafe.Pointer(titlePtr))
@@ -319,8 +319,10 @@ func (w *webview) Dialog(dlgType DialogType, flags int, title string, arg string
 	defer C.free(unsafe.Pointer(argPtr))
 	resultPtr := (*C.char)(C.calloc((C.size_t)(unsafe.Sizeof((*C.char)(nil))), (C.size_t)(maxPath)))
 	defer C.free(unsafe.Pointer(resultPtr))
+	filterPtr := C.CString(filter)
+	defer C.free(unsafe.Pointer(filterPtr))
 	C.CgoDialog(w.w, C.int(dlgType), C.int(flags), titlePtr,
-		argPtr, resultPtr, C.size_t(maxPath))
+		argPtr, resultPtr, C.size_t(maxPath), filterPtr)
 	return C.GoString(resultPtr)
 }
 

lib/renderer/webview/webview.h

@@ -174,7 +174,7 @@ struct webview_priv
   WEBVIEW_API void webview_dialog(struct webview *w,
                                   enum webview_dialog_type dlgtype, int flags,
                                   const char *title, const char *arg,
-                                  char *result, size_t resultsz);
+                                  char *result, size_t resultsz, char *filter);
   WEBVIEW_API void webview_dispatch(struct webview *w, webview_dispatch_fn fn,
                                     void *arg);
   WEBVIEW_API void webview_terminate(struct webview *w);
@@ -418,7 +418,7 @@ struct webview_priv
   WEBVIEW_API void webview_dialog(struct webview *w,
                                   enum webview_dialog_type dlgtype, int flags,
                                   const char *title, const char *arg,
-                                  char *result, size_t resultsz)
+                                  char *result, size_t resultsz, char *filter)
   {
     GtkWidget *dlg;
     if (result != NULL)
@@ -438,6 +438,16 @@ struct webview_priv
           "_Cancel", GTK_RESPONSE_CANCEL,
           (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ? "_Open" : "_Save"),
           GTK_RESPONSE_ACCEPT, NULL);
+      if (filter[0] != '\0') {
+          GtkFileFilter *file_filter = gtk_file_filter_new();
+          gchar **filters  = g_strsplit(filter, ",", -1);
+          gint i;
+          for(i = 0; filters && filters[i]; i++) {
+              gtk_file_filter_add_pattern(file_filter, filters[i]);
+          }
+          gtk_file_filter_set_name(file_filter, filter);
+          gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dlg), file_filter);
+      }
       gtk_file_chooser_set_local_only(GTK_FILE_CHOOSER(dlg), FALSE);
       gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(dlg), FALSE);
       gtk_file_chooser_set_show_hidden(GTK_FILE_CHOOSER(dlg), TRUE);
@@ -1410,6 +1420,8 @@ struct webview_priv
     wc.hInstance = hInstance;
     wc.lpfnWndProc = wndproc;
     wc.lpszClassName = classname;
+    wc.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(100));
+    wc.hIconSm = LoadIcon(hInstance, MAKEINTRESOURCE(100));
     RegisterClassEx(&wc);
 
     style = WS_OVERLAPPEDWINDOW;
@@ -1780,7 +1792,7 @@ struct webview_priv
   WEBVIEW_API void webview_dialog(struct webview *w,
                                   enum webview_dialog_type dlgtype, int flags,
                                   const char *title, const char *arg,
-                                  char *result, size_t resultsz)
+                                  char *result, size_t resultsz, char *filter)
   {
     if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ||
         dlgtype == WEBVIEW_DIALOG_TYPE_SAVE)
@@ -1820,6 +1832,32 @@ struct webview_priv
                     FOS_NOTESTFILECREATE | FOS_NODEREFERENCELINKS |
                     FOS_FORCESHOWHIDDEN | FOS_DEFAULTNOMINIMODE;
       }
+      if (filter[0] != '\0')
+      {
+        int count;
+        int i=0;
+        char* token;
+        char* filter_dup = strdup(filter);
+        for (count=1; filter[count]; filter[count]==',' ? count++ : *filter++);
+        COMDLG_FILTERSPEC rgSpec[count];
+        char* filters[count];
+        token = strtok(filter_dup, ",");
+        while(token != NULL)
+        {
+          filters[i] = token;
+          token = strtok(NULL, ",");
+          i++;
+        }
+        for (int i=0; i < count; i++) {
+          wchar_t *wFilter = (wchar_t *)malloc(4096);
+          MultiByteToWideChar(CP_ACP, 0, filters[i], -1, wFilter, 4096);
+          rgSpec[i].pszName = wFilter;
+          rgSpec[i].pszSpec = wFilter;
+        }
+        if (dlg->lpVtbl->SetFileTypes(dlg, count, rgSpec) != S_OK) {
+          goto error_dlg;
+        }
+      }
       if (dlg->lpVtbl->GetOptions(dlg, &opts) != S_OK)
       {
         goto error_dlg;
@@ -1938,7 +1976,7 @@ struct webview_priv
         (struct webview *)objc_getAssociatedObject(self, "webview");
 
     webview_dialog(w, WEBVIEW_DIALOG_TYPE_OPEN, WEBVIEW_DIALOG_FLAG_FILE, "", "",
-                   filename, 255);
+                   filename, 255, "");
     filename[255] = '\0';
     if (strlen(filename) > 0)
     {
@@ -2201,12 +2239,16 @@ struct webview_priv
   WEBVIEW_API void webview_dialog(struct webview *w,
                                   enum webview_dialog_type dlgtype, int flags,
                                   const char *title, const char *arg,
-                                  char *result, size_t resultsz)
+                                  char *result, size_t resultsz, char *filter)
   {
     if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ||
         dlgtype == WEBVIEW_DIALOG_TYPE_SAVE)
     {
       NSSavePanel *panel;
+      NSString *filter_str = [NSString stringWithUTF8String:filter];
+      filter_str = [filter_str stringByReplacingOccurrencesOfString:@"*."
+                                     withString:@""];
+      NSArray *fileTypes = [filter_str componentsSeparatedByString:@","];
       if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN)
       {
         NSOpenPanel *openPanel = [NSOpenPanel openPanel];
@@ -2219,6 +2261,10 @@ struct webview_priv
         {
           [openPanel setCanChooseFiles:YES];
           [openPanel setCanChooseDirectories:NO];
+          if(filter[0] != NULL)
+          {
+            [openPanel setAllowedFileTypes:fileTypes];
+          }
         }
         [openPanel setResolvesAliases:NO];
         [openPanel setAllowsMultipleSelection:NO];
@@ -2232,6 +2278,10 @@ struct webview_priv
       [panel setShowsHiddenFiles:YES];
       [panel setExtensionHidden:NO];
       [panel setCanSelectHiddenExtension:NO];
+      if(filter[0] != NULL)
+      {
+        [panel setAllowedFileTypes:fileTypes];
+      }
       [panel setTreatsFilePackagesAsDirectories:YES];
       [panel beginSheetModalForWindow:w->priv.window
                     completionHandler:^(NSInteger result) {

runtime/dialog.go

@@ -1,6 +1,7 @@
 package runtime
 
 import "github.com/wailsapp/wails/lib/interfaces"
+import "strings"
 
 // Dialog exposes an interface to native dialogs
 type Dialog struct {
@@ -15,8 +16,16 @@ func NewDialog(renderer interfaces.Renderer) *Dialog {
 }
 
 // SelectFile prompts the user to select a file
-func (r *Dialog) SelectFile() string {
+func (r *Dialog) SelectFile(params ...string) string {
-	return r.renderer.SelectFile()
+	title := "Select File"
+	filter := ""
+	if len(params) > 0 {
+		title = params[0]
+	}
+	if len(params) > 1 {
+		filter = strings.Replace(params[1], " ", "", -1)
+	}
+	return r.renderer.SelectFile(title, filter)
 }
 
 // SelectDirectory prompts the user to select a directory
@@ -25,6 +34,14 @@ func (r *Dialog) SelectDirectory() string {
 }
 
 // SelectSaveFile prompts the user to select a file for saving
-func (r *Dialog) SelectSaveFile() string {
+func (r *Dialog) SelectSaveFile(params ...string) string {
-	return r.renderer.SelectSaveFile()
+	title := "Select Save"
+	filter := ""
+	if len(params) > 0 {
+		title = params[0]
+	}
+	if len(params) > 1 {
+		filter = strings.Replace(params[1], " ", "", -1)
+	}
+	return r.renderer.SelectSaveFile(title, filter)
 }