From 30449ce7afd4c9d33c17bc22eebae2bb01cff3f5 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <pj@pehjota.net>
Date: Fri, 10 Nov 2017 10:50:24 -0500
Subject: mq_profiles_new(): Monitor profiles file for changes

---
(limited to 'src/config')

diff --git a/src/config/profiles.c b/src/config/profiles.c
index bf08af0..3c8abad 100644
--- a/src/config/profiles.c
+++ b/src/config/profiles.c
@@ -111,6 +111,55 @@ insert(MqProfiles *profiles, const gchar *id, const gchar *name,
 	return TRUE;
 }
 
+static void
+changed(GFileMonitor G_GNUC_UNUSED *monitor, GFile G_GNUC_UNUSED *file,
+	GFile G_GNUC_UNUSED *other_file,
+	GFileMonitorEvent G_GNUC_UNUSED event_type, MqProfiles *profiles)
+{
+	gchar *cur_name;
+	gchar *cur_color;
+
+	/* Save the current profile. */
+	if (profiles->current) {
+		cur_name  = mq_profiles_get_name( profiles, profiles->current);
+		cur_color = mq_profiles_get_color(profiles, profiles->current);
+	}
+
+	/* Get changes. */
+	load(profiles);
+
+	/* If another process removed the current profile, restore it.  All
+	 * other processes will reread the file and see the profile re-inserted.
+	 * Multiple processes of the same profile may re-insert their profile,
+	 * but they should all write the same contents to the file.  But this
+	 * can cause a thundering hurd as all running processes read and/or
+	 * write the file in response to each other's changes. */
+	if (profiles->current) {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"  /* False positive */
+		if (!g_key_file_has_group(profiles->key_file,
+					profiles->current)) {
+			insert(profiles, profiles->current,
+				cur_name, cur_color);
+			mq_profiles_save(profiles);
+		}
+		g_free(cur_name);
+		g_free(cur_color);
+#pragma GCC diagnostic pop
+	}
+}
+
+static void
+monitor(MqProfiles *profiles)
+{
+	GFile        *file;
+	GFileMonitor *monitor;
+
+	file = g_file_new_for_path(profiles->file_name);
+	monitor = g_file_monitor_file(file, G_FILE_MONITOR_NONE, NULL, NULL);
+	g_signal_connect(monitor, "changed", G_CALLBACK(changed), profiles);
+}
+
 MqProfiles *
 mq_profiles_new(void)
 {
@@ -130,7 +179,7 @@ mq_profiles_new(void)
 		load(profiles);
 	}
 
-	/* TODO: Set up GFileMonitor. */
+	monitor(profiles);
 
 	return profiles;
 }
--
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