refactor: cleanup icon, return error code, fix incompatible hwnd ptr type warning

examples/project-structure/src/main.v

@@ -18,9 +18,7 @@ fn main() {
 	app.bind(w)
 	w.set_title('V webview examples')
 	w.set_size(800, 600, .@none)
-	$if !macos {
-		w.set_icon('${@VMODROOT}/assets/icon.ico')!
-	}
+	w.set_icon('${@VMODROOT}/assets/icon.ico')!
 	w.navigate('file://${@VMODROOT}/ui/index.html')
 	w.run()
 	w.destroy()

examples/v-js-interop-app/main.v

@@ -69,9 +69,7 @@ fn main() {
 	w := webview.create(debug: true)
 	w.set_title('V webview examples')
 	w.set_size(800, 600, .@none)
-	$if !macos {
-		w.set_icon('${@VMODROOT}/icon.ico')!
-	}
+	w.set_icon('${@VMODROOT}/icon.ico')!
 
 	// Bind V callbacks to appear as global javascript functions.
 	// The first string argument is the functions name in the JS frontend.

src/icon/c/icon.c

@@ -1,39 +1,44 @@
 #include "icon.h"
 
+enum SetIconErrorCode set_icon(const void *ptr, const char *iconFilePath) {
+
 #ifdef _WIN32
-BOOL set_icon_win32(const void *ptr, const wchar_t *iconFilePath) {
-	HICON hIcon = LoadImageW(NULL, iconFilePath, IMAGE_ICON, 0, 0, LR_LOADFROMFILE);
-	if (hIcon == NULL) {
-		fprintf(stderr, "Failed to load icon from file!\n");
-		return FALSE;
+
+	HWND window = (HWND)ptr;
+	if (window == NULL) {
+		return WINDOW_NOT_FOUND;
 	}
-	HWND hwnd = ((const HWND *)ptr);
-	if (hwnd == NULL) {
-		DestroyIcon(hIcon);
-		fprintf(stderr, "Failed to find the application window!\n");
-		return FALSE;
+	size_t size = strlen(iconFilePath) + 1;
+	wchar_t* iconPath = malloc(size * sizeof(wchar_t));
+	mbstowcs(iconPath, iconFilePath, size);
+	HICON hIcon = LoadImageW(NULL, iconPath, IMAGE_ICON, 0, 0, LR_LOADFROMFILE);
+	if (hIcon == NULL) {
+		free(iconPath);
+		return ICON_NOT_FOUND;
 	}
 	// Set the application icon
-	SendMessageW(hwnd, WM_SETICON, ICON_BIG, (LPARAM)hIcon);
+	SendMessageW(window, WM_SETICON, ICON_BIG, (LPARAM)hIcon);
 	// Cleanup
+	free(iconPath);
 	DestroyIcon(hIcon);
-	return TRUE;
-}
+	return OK;
+
 #elif __linux__
-bool set_icon_linux(const void *ptr, const char *iconFilePath) {
+
 	GtkWidget *window = (GtkWidget *)ptr;
 	if (window == NULL) {
-		fprintf(stderr, "Failed to find the application window!\n");
-		return false;
+		return WINDOW_NOT_FOUND;
 	}
 	GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(iconFilePath, NULL);
 	if (pixbuf == NULL) {
-		fprintf(stderr, "Failed to load icon from file!\n");
-		return false;
+		return ICON_NOT_FOUND;
 	}
 	GtkWindow *gtkWindow = GTK_WINDOW(window);
 	gtk_window_set_icon(GTK_WINDOW(gtkWindow), pixbuf);
 	g_object_unref(pixbuf);
-	return true;
-}
+	return OK;
+
 #endif
+
+	return OS_UNSUPPORTED;
+}

src/icon/c/icon.h

@@ -1,12 +1,18 @@
 #pragma once
-#include <stdio.h>
 
 #ifdef _WIN32
-#include <tchar.h>
 #include <windows.h>
-BOOL set_icon_win32(const void *ptr, const wchar_t *iconFilePath);
+#include <wchar.h>
+#include <stdlib.h>
 #elif __linux__
 #include <gtk/gtk.h>
-#include <stdbool.h>
-bool set_icon_linux(const void *ptr, const char *iconFilePath);
 #endif
+
+enum SetIconErrorCode {
+   OK = 0,
+   WINDOW_NOT_FOUND,
+   ICON_NOT_FOUND,
+   OS_UNSUPPORTED,
+};
+
+enum SetIconErrorCode set_icon(const void *ptr, const char *iconFilePath);

src/icon/icon.v

@@ -1,33 +1,32 @@
 module icon
 
-import builtin.wchar
-
-#flag -I@VMODROOT/src/icon/c
-#flag @VMODROOT/src/icon/c/icon.o
-#include "icon.h"
-
 $if linux {
 	#pkgconfig gtk+-3.0
 	#pkgconfig webkit2gtk-4.0
 }
+#flag -I@VMODROOT/src/icon/c
+#flag @VMODROOT/src/icon/c/icon.o
+#include "@VMODROOT/src/icon/c/icon.h"
 
-fn C.set_icon_win32(w voidptr, ico_file_path &wchar.Character) bool
+enum SetIconResult {
+	ok               = C.OK
+	window_not_found = C.WINDOW_NOT_FOUND
+	icon_not_found   = C.ICON_NOT_FOUND
+	os_unsupported   = C.OS_UNSUPPORTED
+}
 
-fn C.set_icon_linux(w voidptr, ico_file_path &char) bool
+fn C.set_icon(w voidptr, ico_file_path &char) SetIconResult
 
 // set_icon updates the icon of the native window. It supports Windows HWND windows and Linux GTK
 // windows under X11 - under Wayland, window application mapping is based on the desktop file entry name.
 // TODO: add macOS support
 pub fn set_icon(window voidptr, icon_file_path string) ! {
-	$if windows {
-		if !C.set_icon_win32(window, wchar.from_string(icon_file_path)) {
-			return error('Failed to set icon.')
-		}
-	} $else $if linux {
-		if !C.set_icon_linux(window, &char(icon_file_path.str)) {
-			return error('Failed to set icon.')
-		}
-	} $else {
-		return error('Failed to set icon. Unsupported OS.')
+	result := SetIconResult(C.set_icon(window, &char(icon_file_path.str)))
+	match result {
+		.ok { return }
+		.icon_not_found { return error('Failed finding icon.') }
+		.window_not_found { return error('Failed to set icon. Window not found.') }
+		// .os_unsupported { return error('Failed to set icon. Unsupported OS.') }
+		.os_unsupported { return }
 	}
 }