Add GTK dialog option on Linux

README.md

@@ -5,7 +5,8 @@ A small C library for opening a file dialog on Windows and Linux.
 ## Usage
 **[sfd.c](src/sfd.c?raw=1)** and **[sfd.h](src/sfd.h?raw=1)** should be dropped
 into an existing project and compiled along with it — on Windows `comdlg32`
-should be linked.
+should be linked. On Linux, sfd opens a pipe to `zenity` by default. You can
+use a GTK dialog instead by defining `SFD_GTK` and linking to gtk3.
 
 The library provides a function for *open* dialogs and one for *save* dialogs:
 

src/sfd.c

@@ -162,14 +162,88 @@ const char* sfd_save_dialog(sfd_Options *opt) {
 
 #endif
 
+#ifndef _WIN32
 
+#ifdef SFD_GTK
 /******************************************************************************
-** Zenity
+** GTK
 *******************************************************************************/
+#include <gtk/gtk.h>
+#include <stdbool.h>
+
+static const char* file_dialog(sfd_Options *opt, int save) {
+	static char result_buf[2048];
+	static bool gtk_inited = false;
+	if (!gtk_inited) {
+		gtk_init(NULL, NULL);
+		gtk_inited = true;
+	}
+
+	GtkWidget *dialog = gtk_file_chooser_dialog_new(
+		opt->title, NULL,
+		save ? GTK_FILE_CHOOSER_ACTION_SAVE : GTK_FILE_CHOOSER_ACTION_OPEN,
+		"Cancel", GTK_RESPONSE_CANCEL,
+		save ? "Save" : "Open", GTK_RESPONSE_ACCEPT,
+		NULL
+	);
+
+	if (opt->path && opt->path[0] != '\0') {
+		gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(dialog), opt->path);
+	}
+
+	if (opt->filter) {
+		GtkFileFilter *filter = gtk_file_filter_new();
+		gtk_file_filter_set_name(filter, opt->filter_name);
+
+		char filter_buf[256];
+		strncpy(filter_buf, opt->filter, sizeof(filter_buf) - 1);
+		filter_buf[sizeof(filter_buf) - 1] = '\0';
+		char *s = strtok(filter_buf, "|");
+		while (s != NULL) {
+			gtk_file_filter_add_pattern(filter, s);
+			s = strtok(NULL, "|");
+		}
+
+		gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
+	}
+
+	GtkFileFilter *filter = gtk_file_filter_new();
+	gtk_file_filter_set_name(filter, "All files");
+	gtk_file_filter_add_pattern(filter, "*");
+	gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
+
+	gint resp = gtk_dialog_run(GTK_DIALOG(dialog));
+	char *out = NULL;
+	if (resp == GTK_RESPONSE_ACCEPT) {
+		char *filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dialog));
+		strncpy(result_buf, filename, sizeof(result_buf) - 1);
+		result_buf[sizeof(result_buf) - 1] = 0;
+		g_free(filename);
+
+		if (save && opt->extension && !strstr(result_buf, opt->extension)) {
+			strncat(result_buf, opt->extension, sizeof(result_buf) - strlen(opt->extension) - 1);
+		}
+	}
+
+	gtk_widget_destroy(dialog);
+
+	return result_buf;
+}
+
+
+const char* sfd_open_dialog(sfd_Options *opt) {
+  return file_dialog(opt, 0);
+}
 
-#ifndef _WIN32
 
+const char* sfd_save_dialog(sfd_Options *opt) {
+  return file_dialog(opt, 1);
+}
 
+#else
+/******************************************************************************
+** Zenity
+*******************************************************************************/
 static const char* file_dialog(sfd_Options *opt, int save) {
   static char result_buf[2048];
   char buf[2048];
@@ -257,5 +331,6 @@ const char* sfd_save_dialog(sfd_Options *opt) {
   return file_dialog(opt, 1);
 }
 
+#endif
 
 #endif