Implement file association Open a file from Finder/Explorer

v2/internal/frontend/desktop/darwin/AppDelegate.h

@@ -11,7 +11,7 @@
 #import <Cocoa/Cocoa.h>
 #import "WailsContext.h"
 
-@interface AppDelegate : NSResponder <NSTouchBarProvider>
+@interface AppDelegate : NSResponder <NSApplicationDelegate, NSTouchBarProvider>
 
 @property bool alwaysOnTop;
 @property bool startHidden;
@@ -20,4 +20,6 @@
 
 @end
 
+extern void HandleOpenFile(char *);
+
 #endif /* AppDelegate_h */

v2/internal/frontend/desktop/darwin/AppDelegate.m

@@ -11,9 +11,17 @@
 #import "AppDelegate.h"
 
 @implementation AppDelegate
+-(BOOL)application:(NSApplication *)sender openFile:(NSString *)filename
+{
+   const char* utf8FileName = filename.UTF8String;
+   HandleOpenFile((char*)utf8FileName);
+   return YES;
+}
+
 - (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {
-    return NO;  
+    return NO;
 }
+
 - (void)applicationWillFinishLaunching:(NSNotification *)aNotification {
     [NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
     if (self.alwaysOnTop) {

v2/internal/frontend/desktop/darwin/frontend.go

@@ -38,6 +38,7 @@ const startURL = "wails://wails/"
 var messageBuffer = make(chan string, 100)
 var requestBuffer = make(chan webview.Request, 100)
 var callbackBuffer = make(chan uint, 10)
+var openFilepathBuffer = make(chan string, 100)
 
 type Frontend struct {
 
@@ -107,15 +108,23 @@ func NewFrontend(ctx context.Context, appoptions *options.App, myLogger *logger.
 
 	go result.startMessageProcessor()
 	go result.startCallbackProcessor()
+	go result.startFileOpenProcessor()
 
 	return result
 }
 
+func (f *Frontend) startFileOpenProcessor() {
+	for filePath := range openFilepathBuffer {
+		f.ProcessOpenFileEvent(filePath)
+	}
+}
+
 func (f *Frontend) startMessageProcessor() {
 	for message := range messageBuffer {
 		f.processMessage(message)
 	}
 }
+
 func (f *Frontend) startRequestProcessor() {
 	for request := range requestBuffer {
 		f.assets.ServeWebViewRequest(request)
@@ -355,6 +364,12 @@ func (f *Frontend) processMessage(message string) {
 
 }
 
+func (f *Frontend) ProcessOpenFileEvent(filePath string) {
+	if f.frontendOptions.Mac != nil && f.frontendOptions.Mac.OnFileOpen != nil {
+		f.frontendOptions.Mac.OnFileOpen(filePath)
+	}
+}
+
 func (f *Frontend) Callback(message string) {
 	escaped, err := json.Marshal(message)
 	if err != nil {
@@ -398,3 +413,9 @@ func processCallback(callbackID uint) {
 func processURLRequest(_ unsafe.Pointer, wkURLSchemeTask unsafe.Pointer) {
 	requestBuffer <- webview.NewRequest(wkURLSchemeTask)
 }
+
+//export HandleOpenFile
+func HandleOpenFile(filePath *C.char) {
+	goFilepath := C.GoString(filePath)
+	openFilepathBuffer <- goFilepath
+}

v2/internal/project/project.go

@@ -216,11 +216,20 @@ type Author struct {
 }
 
 type Info struct {
-	CompanyName    string  `json:"companyName"`
-	ProductName    string  `json:"productName"`
-	ProductVersion string  `json:"productVersion"`
-	Copyright      *string `json:"copyright"`
-	Comments       *string `json:"comments"`
+	CompanyName      string            `json:"companyName"`
+	ProductName      string            `json:"productName"`
+	ProductVersion   string            `json:"productVersion"`
+	Copyright        *string           `json:"copyright"`
+	Comments         *string           `json:"comments"`
+	FileAssociations []FileAssociation `json:"fileAssociations"`
+}
+
+type FileAssociation struct {
+	Ext         string `json:"ext"`
+	Name        string `json:"name"`
+	Description string `json:"description"`
+	IconName    string `json:"iconName"`
+	Role        string `json:"role"`
 }
 
 type Bindings struct {

v2/pkg/buildassets/build/darwin/Info.dev.plist

@@ -23,10 +23,29 @@
         <string>true</string>
         <key>NSHumanReadableCopyright</key>
         <string>{{.Info.Copyright}}</string>
+        {{if .Info.FileAssociations}}
+        <key>CFBundleDocumentTypes</key>
+        <array>
+          {{range .Info.FileAssociations}}
+          <dict>
+            <key>CFBundleTypeExtensions</key>
+            <array>
+              <string>{{.Ext}}</string>
+            </array>
+            <key>CFBundleTypeName</key>
+            <string>{{.Name}}</string>
+            <key>CFBundleTypeRole</key>
+            <string>{{.Role}}</string>
+            <key>CFBundleTypeIconFile</key>
+            <string>{{.IconName}}</string>
+          </dict>
+          {{end}}
+        </array>
+        {{end}}
         <key>NSAppTransportSecurity</key>
         <dict>
             <key>NSAllowsLocalNetworking</key>
             <true/>
         </dict>
     </dict>
-</plist>
+</plist>

v2/pkg/buildassets/build/darwin/Info.plist

@@ -23,5 +23,24 @@
         <string>true</string>
         <key>NSHumanReadableCopyright</key>
         <string>{{.Info.Copyright}}</string>
+        {{if .Info.FileAssociations}}
+        <key>CFBundleDocumentTypes</key>
+        <array>
+          {{range .Info.FileAssociations}}
+          <dict>
+            <key>CFBundleTypeExtensions</key>
+            <array>
+              <string>{{.Ext}}</string>
+            </array>
+            <key>CFBundleTypeName</key>
+            <string>{{.Name}}</string>
+            <key>CFBundleTypeRole</key>
+            <string>{{.Role}}</string>
+            <key>CFBundleTypeIconFile</key>
+            <string>{{.IconName}}</string>
+          </dict>
+          {{end}}
+        </array>
+        {{end}}
     </dict>
-</plist>
+</plist>

v2/pkg/buildassets/build/windows/installer/project.nsi

@@ -3,10 +3,10 @@ Unicode true
 ####
 ## Please note: Template replacements don't work in this file. They are provided with default defines like
 ## mentioned underneath.
-## If the keyword is not defined, "wails_tools.nsh" will populate them with the values from ProjectInfo. 
-## If they are defined here, "wails_tools.nsh" will not touch them. This allows to use this project.nsi manually 
+## If the keyword is not defined, "wails_tools.nsh" will populate them with the values from ProjectInfo.
+## If they are defined here, "wails_tools.nsh" will not touch them. This allows to use this project.nsi manually
 ## from outside of Wails for debugging and development of the installer.
-## 
+##
 ## For development first make a wails nsis build to populate the "wails_tools.nsh":
 ## > wails build --target windows/amd64 --nsis
 ## Then you can call makensis on this file with specifying the path to your binary:
@@ -17,7 +17,7 @@ Unicode true
 ## For a installer with both architectures:
 ## > makensis -DARG_WAILS_AMD64_BINARY=..\..\bin\app-amd64.exe -DARG_WAILS_ARM64_BINARY=..\..\bin\app-arm64.exe
 ####
-## The following information is taken from the ProjectInfo file, but they can be overwritten here. 
+## The following information is taken from the ProjectInfo file, but they can be overwritten here.
 ####
 ## !define INFO_PROJECTNAME    "MyProject" # Default "{{.Name}}"
 ## !define INFO_COMPANYNAME    "MyCompany" # Default "{{.Info.CompanyName}}"
@@ -85,16 +85,18 @@ Section
     !insertmacro wails.webview2runtime
 
     SetOutPath $INSTDIR
-    
+
     !insertmacro wails.files
 
     CreateShortcut "$SMPROGRAMS\${INFO_PRODUCTNAME}.lnk" "$INSTDIR\${PRODUCT_EXECUTABLE}"
     CreateShortCut "$DESKTOP\${INFO_PRODUCTNAME}.lnk" "$INSTDIR\${PRODUCT_EXECUTABLE}"
 
+    !insertmacro wails.associateFiles
+
     !insertmacro wails.writeUninstaller
 SectionEnd
 
-Section "uninstall" 
+Section "uninstall"
     !insertmacro wails.setShellContext
 
     RMDir /r "$AppData\${PRODUCT_EXECUTABLE}" # Remove the WebView2 DataPath
@@ -104,5 +106,7 @@ Section "uninstall"
     Delete "$SMPROGRAMS\${INFO_PRODUCTNAME}.lnk"
     Delete "$DESKTOP\${INFO_PRODUCTNAME}.lnk"
 
+    !insertmacro wails.unassociateFiles
+
     !insertmacro wails.deleteUninstaller
 SectionEnd

v2/pkg/buildassets/build/windows/installer/wails_tools.nsh

@@ -163,17 +163,58 @@ RequestExecutionLevel "${REQUEST_EXECUTION_LEVEL}"
             Goto ok
         ${EndIf}
      ${EndIf}
-    
+
 	SetDetailsPrint both
     DetailPrint "${WAILS_INSTALL_WEBVIEW_DETAILPRINT}"
     SetDetailsPrint listonly
-    
+
     InitPluginsDir
     CreateDirectory "$pluginsdir\webview2bootstrapper"
     SetOutPath "$pluginsdir\webview2bootstrapper"
     File "tmp\MicrosoftEdgeWebview2Setup.exe"
     ExecWait '"$pluginsdir\webview2bootstrapper\MicrosoftEdgeWebview2Setup.exe" /silent /install'
-    
+
     SetDetailsPrint both
     ok:
-!macroend
+!macroend
+
+# Copy of APP_ASSOCIATE and APP_UNASSOCIATE macros from here https://gist.github.com/nikku/281d0ef126dbc215dd58bfd5b3a5cd5b
+!macro APP_ASSOCIATE EXT FILECLASS DESCRIPTION ICON COMMANDTEXT COMMAND
+  ; Backup the previously associated file class
+  ReadRegStr $R0 SHELL_CONTEXT "Software\Classes\.${EXT}" ""
+  WriteRegStr SHELL_CONTEXT "Software\Classes\.${EXT}" "${FILECLASS}_backup" "$R0"
+
+  WriteRegStr SHELL_CONTEXT "Software\Classes\.${EXT}" "" "${FILECLASS}"
+
+  WriteRegStr SHELL_CONTEXT "Software\Classes\${FILECLASS}" "" `${DESCRIPTION}`
+  WriteRegStr SHELL_CONTEXT "Software\Classes\${FILECLASS}\DefaultIcon" "" `${ICON}`
+  WriteRegStr SHELL_CONTEXT "Software\Classes\${FILECLASS}\shell" "" "open"
+  WriteRegStr SHELL_CONTEXT "Software\Classes\${FILECLASS}\shell\open" "" `${COMMANDTEXT}`
+  WriteRegStr SHELL_CONTEXT "Software\Classes\${FILECLASS}\shell\open\command" "" `${COMMAND}`
+!macroend
+
+!macro APP_UNASSOCIATE EXT FILECLASS
+  ; Backup the previously associated file class
+  ReadRegStr $R0 SHELL_CONTEXT "Software\Classes\.${EXT}" `${FILECLASS}_backup`
+  WriteRegStr SHELL_CONTEXT "Software\Classes\.${EXT}" "" "$R0"
+
+  DeleteRegKey SHELL_CONTEXT `Software\Classes\${FILECLASS}`
+!macroend
+
+!macro wails.associateFiles
+    ; Create file associations
+    {{range .Info.FileAssociations}}
+      !insertmacro APP_ASSOCIATE "{{.Ext}}" "{{.Name}}" "{{.Description}}" "$INSTDIR\{{.IconName}}.ico" "Open with ${INFO_PRODUCTNAME}" "$INSTDIR\${PRODUCT_EXECUTABLE} $\"%1$\""
+
+      File "..\{{.IconName}}.ico"
+    {{end}}
+!macroend
+
+!macro wails.unassociateFiles
+    ; Delete app associations
+    {{range .Info.FileAssociations}}
+      !insertmacro APP_UNASSOCIATE "{{.Ext}}" "{{.Name}}"
+
+      Delete "$INSTDIR\{{.IconName}}.ico"
+    {{end}}
+!macroend

v2/pkg/commands/build/packager.go

@@ -6,6 +6,7 @@ import (
 	"github.com/leaanthony/winicon"
 	"github.com/tc-hib/winres"
 	"github.com/tc-hib/winres/version"
+	"github.com/wailsapp/wails/v2/internal/project"
 	"image"
 	"os"
 	"path/filepath"
@@ -95,12 +96,20 @@ func packageApplicationForDarwin(options *Options) error {
 		return err
 	}
 
-	// Generate Icons
-	err = processApplicationIcon(options, resourceDir)
+	// Generate App Icon
+	err = processDarwinIcon(options.ProjectData, "appicon", resourceDir, "iconfile")
 	if err != nil {
 		return err
 	}
 
+	// Generate FileAssociation Icons
+	for _, fileAssociation := range options.ProjectData.Info.FileAssociations {
+		err = processDarwinIcon(options.ProjectData, fileAssociation.IconName, resourceDir, "")
+		if err != nil {
+			return err
+		}
+	}
+
 	options.CompiledBinary = packedBinaryPath
 
 	return nil
@@ -124,8 +133,8 @@ func processPList(options *Options, contentsDirectory string) error {
 	return os.WriteFile(targetFile, content, 0644)
 }
 
-func processApplicationIcon(options *Options, resourceDir string) (err error) {
-	appIcon, err := buildassets.ReadFile(options.ProjectData, "appicon.png")
+func processDarwinIcon(projectData *project.Project, iconName string, resourceDir string, destIconName string) (err error) {
+	appIcon, err := buildassets.ReadFile(projectData, iconName+".png")
 	if err != nil {
 		return err
 	}
@@ -135,7 +144,11 @@ func processApplicationIcon(options *Options, resourceDir string) (err error) {
 		return err
 	}
 
-	tgtBundle := filepath.Join(resourceDir, "iconfile.icns")
+	if destIconName == "" {
+		destIconName = iconName
+	}
+
+	tgtBundle := filepath.Join(resourceDir, destIconName+".icns")
 	dest, err := os.Create(tgtBundle)
 	if err != nil {
 		return err
@@ -151,13 +164,21 @@ func processApplicationIcon(options *Options, resourceDir string) (err error) {
 }
 
 func packageApplicationForWindows(options *Options) error {
-	// Generate icon
+	// Generate app icon
 	var err error
-	err = generateIcoFile(options)
+	err = generateIcoFile(options, "appicon", "icon")
 	if err != nil {
 		return err
 	}
 
+	// Generate FileAssociation Icons
+	for _, fileAssociation := range options.ProjectData.Info.FileAssociations {
+		err = generateIcoFile(options, fileAssociation.IconName, "")
+		if err != nil {
+			return err
+		}
+	}
+
 	// Create syso file
 	err = compileResources(options)
 	if err != nil {
@@ -171,13 +192,18 @@ func packageApplicationForLinux(_ *Options) error {
 	return nil
 }
 
-func generateIcoFile(options *Options) error {
-	content, err := buildassets.ReadFile(options.ProjectData, "appicon.png")
+func generateIcoFile(options *Options, iconName string, destIconName string) error {
+	content, err := buildassets.ReadFile(options.ProjectData, iconName+".png")
 	if err != nil {
 		return err
 	}
+
+	if destIconName == "" {
+		destIconName = iconName
+	}
+
 	// Check ico file exists already
-	icoFile := buildassets.GetLocalPath(options.ProjectData, "windows/icon.ico")
+	icoFile := buildassets.GetLocalPath(options.ProjectData, "windows/"+destIconName+".ico")
 	if !fs.FileExists(icoFile) {
 		if dir := filepath.Dir(icoFile); !fs.DirExists(dir) {
 			if err := fs.MkDirs(dir, 0755); err != nil {