From 2825c899617cefc872198296f83572ec3504db93 Mon Sep 17 00:00:00 2001
From: Přemysl Janouch <p.janouch@gmail.com>
Date: Wed, 27 Jan 2016 20:22:49 +0100
Subject: Add gdm-switch-user, run by dwmstatus

---
 CMakeLists.txt    | 13 +++++++++++++
 README.adoc       |  2 ++
 dwmstatus.c       | 15 +++++++++++++++
 gdm-switch-user.c | 17 +++++++++++++++++
 4 files changed, 47 insertions(+)
 create mode 100644 gdm-switch-user.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e37b106..b5e03bc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,6 +25,9 @@ include (AddThreads)
 
 find_package (PkgConfig REQUIRED)
 pkg_check_modules (dependencies REQUIRED libpulse x11)
+pkg_check_modules (gdm gdm glib-2.0 gio-2.0)
+
+option (WITH_GDM "Compile with GDM support" ${gdm_FOUND})
 
 set (project_libraries ${dependencies_LIBRARIES})
 include_directories (${dependencies_INCLUDE_DIRS})
@@ -44,6 +47,12 @@ target_link_libraries (brightness ${project_libraries})
 add_executable (fancontrol-ng fancontrol-ng.c)
 target_link_libraries (fancontrol-ng ${project_libraries})
 
+if (WITH_GDM)
+	include_directories (${gdm_INCLUDE_DIRS})
+	add_executable (gdm-switch-user gdm-switch-user.c)
+	target_link_libraries (gdm-switch-user ${gdm_LIBRARIES})
+endif (WITH_GDM)
+
 # The files to be installed
 include (GNUInstallDirs)
 
@@ -54,6 +63,10 @@ install (FILES ${PROJECT_BINARY_DIR}/fancontrol-ng.service
 install (FILES fancontrol-ng.conf.example
 	DESTINATION ${CMAKE_INSTALL_DATADIR}/fancontrol-ng)
 
+if (WITH_GDM)
+	install (TARGETS gdm-switch-user DESTINATION ${CMAKE_INSTALL_BINDIR})
+endif (WITH_GDM)
+
 install (TARGETS dwmstatus brightness fancontrol-ng
 	DESTINATION ${CMAKE_INSTALL_BINDIR})
 install (PROGRAMS shellify DESTINATION ${CMAKE_INSTALL_BINDIR})
diff --git a/README.adoc b/README.adoc
index 10c28a5..acf7593 100644
--- a/README.adoc
+++ b/README.adoc
@@ -14,6 +14,8 @@ to other people as well.
    in general it doesn't handle everything the original does
  - 'shellify' is a simple script that sets up a shell for commands like vgdb
    and nmcli that are painfully lacking it
+ - 'gdm-switch-user' tells the running GDM daemon, if any, to show the switch
+   user screen
 
 Don't expect them to work under any OS that isn't Linux.
 
diff --git a/dwmstatus.c b/dwmstatus.c
index 11c78ef..241c435 100644
--- a/dwmstatus.c
+++ b/dwmstatus.c
@@ -2637,6 +2637,18 @@ on_volume_set (struct app_context *ctx, int arg)
 		ctx->sink_name, &volume, on_volume_finish, ctx));
 }
 
+static void
+on_lock (struct app_context *ctx, int arg)
+{
+	(void) arg;
+
+	// One of these will work
+	char *argv_gdm[] = { "gdm-switch-user", NULL };
+	spawn (ctx, argv_gdm);
+	char *argv_ldm[] = { "dm-tool", "lock", NULL };
+	spawn (ctx, argv_ldm);
+}
+
 static void
 on_brightness (struct app_context *ctx, int arg)
 {
@@ -2655,6 +2667,9 @@ struct
 }
 g_keys[] =
 {
+	// This key should be labeled L on normal Qwert[yz] layouts
+	{ Mod4Mask,            XK_n,         on_lock,          0 },
+
 	// MPD
 	{ Mod4Mask,            XK_Up,        on_mpd_play,      0 },
 	{ Mod4Mask,            XK_Down,      on_mpd_stop,      0 },
diff --git a/gdm-switch-user.c b/gdm-switch-user.c
new file mode 100644
index 0000000..5718c31
--- /dev/null
+++ b/gdm-switch-user.c
@@ -0,0 +1,17 @@
+// Public domain
+#include <gdm-user-switching.h>
+
+int
+main (int argc, char *argv[])
+{
+	(void) argc;
+	(void) argv;
+
+	GError *e = NULL;
+	if (!gdm_goto_login_session_sync (g_cancellable_new (), &e))
+	{
+		g_printerr ("%s\n", e->message);
+		return 1;
+	}
+	return 0;
+}
-- 
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