i3 - improved tiling WM

Add IPC event for window title changes

Patch status: superseded

Patch by Marco Hunsicker

To apply this patch, use:
curl http://cr.i3wm.org/patch/384/raw.patch | git am

b/include/i3/ipc.h

17 
@@ -100,3 +100,6 @@ typedef struct i3_ipc_header {
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 /** Bar config update will be triggered to update the bar config */
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 #define I3_IPC_EVENT_BARCONFIG_UPDATE           (I3_IPC_EVENT_MASK | 4)
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+
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+/* The window title event will be triggered upon window title changes */
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+#define I3_IPC_EVENT_WINDOW_TITLE               (I3_IPC_EVENT_MASK | 5)

b/include/ipc.h

28 
@@ -87,3 +87,9 @@ void dump_node(yajl_gen gen, Con *con, bool inplace_restart);
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  * respectively.
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  */
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 void ipc_send_workspace_focus_event(Con *current, Con *old);
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+
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+/*
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+ * For the window "window_title" event we send, along the usual "change" field,
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+ * also the changed title, in "title".
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+ */
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+void ipc_send_window_title_event(Con *current);

b/src/con.c

42 
@@ -213,6 +213,8 @@ void con_focus(Con *con) {
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     assert(con != NULL);
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     DLOG("con_focus = %p\n", con);
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+    bool already_focused = (con == focused);
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+
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     /* 1: set focused-pointer to the new con */
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     /* 2: exchange the position of the container in focus stack of the parent all the way up */
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     TAILQ_REMOVE(&(con->parent->focus_head), con, focused);
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@@ -221,15 +223,22 @@ void con_focus(Con *con) {
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         con_focus(con->parent);
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     focused = con;
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-    /* We can't blindly reset non-leaf containers since they might have
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-     * other urgent children. Therefore we only reset leafs and propagate
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-     * the changes upwards via con_update_parents_urgency() which does proper
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-     * checks before resetting the urgency.
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-     */
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-    if (con->urgent && con_is_leaf(con)) {
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-        con->urgent = false;
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-        con_update_parents_urgency(con);
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-        workspace_update_urgent_flag(con_get_workspace(con));
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+
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+    if (con_is_leaf(con))
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+    {
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+        if (!already_focused)
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+            ipc_send_window_title_event(con);
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+
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+        /* We can't blindly reset non-leaf containers since they might have
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+         * other urgent children. Therefore we only reset leafs and propagate
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+         * the changes upwards via con_update_parents_urgency() which does proper
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+         * checks before resetting the urgency.
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+         */
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+        if (con->urgent) {
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+            con->urgent = false;
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+            con_update_parents_urgency(con);
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+            workspace_update_urgent_flag(con_get_workspace(con));
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+        }
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     }
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 }
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b/src/handlers.c

87 
@@ -540,6 +540,8 @@ static bool handle_windowname_change(void *data, xcb_connection_t *conn, uint8_t
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     window_update_name(con->window, prop, false);
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+    ipc_send_window_title_event(con);
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+
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     x_push_changes(croot);
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     return true;
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@@ -558,6 +560,8 @@ static bool handle_windowname_change_legacy(void *data, xcb_connection_t *conn,
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     window_update_name_legacy(con->window, prop, false);
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+    ipc_send_window_title_event(con);
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+
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     x_push_changes(croot);
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     return true;

b/src/ipc.c

109 
@@ -21,6 +21,7 @@
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 #include <yajl/yajl_parse.h>
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 char *current_socketpath = NULL;
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+char *current_windowtitle = NULL;
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 TAILQ_HEAD(ipc_client_head, ipc_client) all_clients = TAILQ_HEAD_INITIALIZER(all_clients);
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117 
@@ -1056,3 +1057,43 @@ void ipc_send_workspace_focus_event(Con *current, Con *old) {
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     y(free);
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     setlocale(LC_NUMERIC, "");
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 }
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+
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+const char* get_window_title(Con *con) {
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+    return (con != NULL && con->window != NULL && con->window->name != NULL) ? i3string_as_utf8(con->window->name) : "";
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+}
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+
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+void ipc_send_window_title_event(Con *con) {
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+    const char* title = get_window_title(con);
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+
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+    if (con != focused || (current_windowtitle != NULL && strcmp(current_windowtitle, title) == 0)) {
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+        return;
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+    }
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+
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+    FREE(current_windowtitle);
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+
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+    current_windowtitle = strdup(title);
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+
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+    setlocale(LC_NUMERIC, "C");
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+    yajl_gen gen = ygenalloc();
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+
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+    y(map_open);
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+
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+    ystr("change");
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+    ystr("window_title");
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+
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+    ystr("title");
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+    ystr(title);
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+
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+    ystr("current");
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+    dump_node(gen, con, false);
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+
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+    y(map_close);
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+
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+    const unsigned char *payload;
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+    ylength length;
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+    y(get_buf, &payload, &length);
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+
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+    ipc_send_event("window_title", I3_IPC_EVENT_WINDOW_TITLE, (const char *)payload);
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+    y(free);
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+    setlocale(LC_NUMERIC, "");
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+}