Implement support for startup notifications

This only sets up startup notifications for the 'exec' commands and directives.

Monitoring startups follows later.

common.mk

@@ -57,6 +57,7 @@ CFLAGS += $(call cflags_for_lib, x11)
 CFLAGS += $(call cflags_for_lib, yajl)
 CFLAGS += $(call cflags_for_lib, libev)
 CFLAGS += $(call cflags_for_lib, libpcre)
+CFLAGS += $(call cflags_for_lib, libstartup-notification-1.0)
 CPPFLAGS += -DI3_VERSION=\"${GIT_VERSION}\"
 CPPFLAGS += -DSYSCONFDIR=\"${SYSCONFDIR}\"
 CPPFLAGS += -DTERM_EMU=\"$(TERM_EMU)\"
@@ -84,6 +85,7 @@ LIBS += $(call ldflags_for_lib, x11,X11)
 LIBS += $(call ldflags_for_lib, yajl,yajl)
 LIBS += $(call ldflags_for_lib, libev,ev)
 LIBS += $(call ldflags_for_lib, libpcre,pcre)
+LIBS += $(call ldflags_for_lib, libstartup-notification-1.0,startup-notification-1)
 
 # Please test if -Wl,--as-needed works on your platform and send me a patch.
 # it is known not to work on Darwin (Mac OS X)

include/i3.h

@@ -12,6 +12,9 @@
 
 #include <X11/XKBlib.h>
 
+#define SN_API_NOT_YET_FROZEN 1
+#include <libsn/sn-launcher.h>
+
 #include "queue.h"
 #include "data.h"
 #include "xcb.h"
@@ -21,6 +24,11 @@
 
 extern xcb_connection_t *conn;
 extern int conn_screen;
+/** The last timestamp we got from X11 (timestamps are included in some events
+ * and are used for some things, like determining a unique ID in startup
+ * notification). */
+extern xcb_timestamp_t last_timestamp;
+extern SnDisplay *sndisplay;
 extern xcb_key_symbols_t *keysyms;
 extern char **start_argv;
 extern Display *xlibdpy, *xkbdpy;

src/main.c

@@ -22,6 +22,14 @@ xcb_connection_t *conn;
 /* The screen (0 when you are using DISPLAY=:0) of the connection 'conn' */
 int conn_screen;
 
+/* Display handle for libstartup-notification */
+SnDisplay *sndisplay;
+
+/* The last timestamp we got from X11 (timestamps are included in some events
+ * and are used for some things, like determining a unique ID in startup
+ * notification). */
+xcb_timestamp_t last_timestamp = XCB_CURRENT_TIME;
+
 xcb_screen_t *root_screen;
 xcb_window_t root;
 uint8_t root_depth;
@@ -362,6 +370,8 @@ int main(int argc, char *argv[]) {
     if (xcb_connection_has_error(conn))
         errx(EXIT_FAILURE, "Cannot open display\n");
 
+    sndisplay = sn_xcb_display_new(conn, NULL, NULL);
+
     /* Initialize the libev event loop. This needs to be done before loading
      * the config file because the parser will install an ev_child watcher
      * for the nagbar when config errors are found. */

src/util.c

@@ -21,6 +21,9 @@
 #include <yajl/yajl_version.h>
 #include <libgen.h>
 
+#define SN_API_NOT_YET_FROZEN 1
+#include <libsn/sn-launcher.h>
+
 #include "all.h"
 
 static iconv_t conversion_descriptor = 0;
@@ -69,11 +72,31 @@ bool update_if_necessary(uint32_t *destination, const uint32_t new_value) {
  *
  */
 void start_application(const char *command) {
+    /* Create a startup notification context to monitor the progress of this
+     * startup. */
+    SnLauncherContext *context;
+    context = sn_launcher_context_new(sndisplay, conn_screen);
+    sn_launcher_context_set_name(context, "i3");
+    sn_launcher_context_set_description(context, "exec command in i3");
+    /* Chop off everything starting from the first space (if there are any
+     * spaces in the command), since we don’t want the parameters. */
+    char *first_word = sstrdup(command);
+    char *space = strchr(first_word, ' ');
+    if (space)
+        *space = '\0';
+    sn_launcher_context_initiate(context, "i3", first_word, last_timestamp);
+    free(first_word);
+
+    LOG("startup id = %s\n", sn_launcher_context_get_startup_id(context));
+
     LOG("executing: %s\n", command);
     if (fork() == 0) {
         /* Child process */
         setsid();
         if (fork() == 0) {
+            /* Setup the environment variable(s) */
+            sn_launcher_context_setup_child_process(context);
+
             /* Stores the path of the shell */
             static const char *shell = NULL;