Implement file association Open a file from Finder/Explorer (#2918)

* implement MacOS openFile/openFiles events

* wip: windows file association

* fix macro import

* add file icon copy

* try copy icon

* keep only required part of scripts

* update config schema

* fix json

* set fileAssociation for mac via config

* proper iconName handling

* add fileAssociation icon generator

* fix file association icons bundle

* don't break compatibility

* remove mimeType as not supported linux for now

* add documentation

* adjust config schema

* restore formatting

* remove unused option in file association

* get rid of openFiles mac os. change configuration structure

* remove unused channel

* fix documentation

* fix typo

---------

Co-authored-by: Lea Anthony <lea.anthony@gmail.com>

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)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {
-    return NO;  
+-(BOOL)application:(NSApplication *)sender openFile:(NSString *)filename
+{
+   const char* utf8FileName = filename.UTF8String;
+   HandleOpenFile((char*)utf8FileName);
+   return YES;
 }
+
+- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {
+    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 {