Added the OS dependent function subsurface_launch_for_uri()

Opening URI addresses from Subsurface does not work on Windows using
the latest GTK bundle from the Gnome website. The reason lies in GIO
and GLib and how it obtains assigned applications for protocols and MIME
types.

While gtk_show_uri() should be viable for both linux.c and macos.c,
in windows.c ShellExecute() is used, which provides proper support
for the URI calls.

subsurface_launch_for_uri() returns TRUE on success.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

4 files changed, 33 insertions, 0 deletions

diff --git a/dive.h b/dive.h
index 365f519fe..28ea79926 100644
--- a/dive.h
+++ b/dive.h
@@ -583,6 +583,7 @@ typedef enum {
 extern const char *existing_filename;
 extern const char *subsurface_gettext_domainpath(char *);
 extern gboolean subsurface_os_feature_available(os_feature_t);
+extern gboolean subsurface_launch_for_uri(const char *);
 extern void subsurface_command_line_init(gint *, gchar ***);
 extern void subsurface_command_line_exit(gint *, gchar ***);
 
diff --git a/linux.c b/linux.c
index 9281b434e..f8d3e88b4 100644
--- a/linux.c
+++ b/linux.c
@@ -176,3 +176,15 @@ gboolean subsurface_os_feature_available(os_feature_t f)
 {
 	return TRUE;
 }
+
+gboolean subsurface_launch_for_uri(const char* uri)
+{
+	GError *err = NULL;
+	gtk_show_uri(NULL, uri, gtk_get_current_event_time(), &err);
+	if (err) {
+		g_message("%s: %s", err->message, uri);
+		g_error_free(err);
+		return FALSE;
+	}
+	return TRUE;
+}
diff --git a/macos.c b/macos.c
index b8451cfd0..b67c9d6ea 100644
--- a/macos.c
+++ b/macos.c
@@ -220,3 +220,15 @@ gboolean subsurface_os_feature_available(os_feature_t f)
 {
 	return TRUE;
 }
+
+gboolean subsurface_launch_for_uri(const char* uri)
+{
+	GError *err = NULL;
+	gtk_show_uri(NULL, uri, gtk_get_current_event_time(), &err);
+	if (err) {
+		g_message("%s: %s", err->message, uri);
+		g_error_free(err);
+		return FALSE;
+	}
+	return TRUE;
+}
diff --git a/windows.c b/windows.c
index f9b04ce03..2730d4819 100644
--- a/windows.c
+++ b/windows.c
@@ -298,6 +298,14 @@ void subsurface_command_line_exit(gint *argc, gchar ***argv)
 	g_free(*argv);
 }
 
+gboolean subsurface_launch_for_uri(const char* uri)
+{
+	if ((INT_PTR)ShellExecute(NULL, "open", uri, NULL, NULL, SW_SHOWNORMAL) > 32)
+		return TRUE;
+	g_message("ShellExecute failed for: %s", uri);
+	return FALSE;
+}
+
 /* check if we are running a newer OS version */
 gboolean subsurface_os_feature_available(os_feature_t f)
 {