add find_or_start

README.md

@@ -4,7 +4,7 @@ cerberus
 * Designed for wide screens.
 * Static tiling; you get just three fixed asymmetric tiles and windows never move automatically.
 * Bare minimum EWMH to support panels and [simpleswitcher](https://github.com/seanpringle/simpleswitcher)
-* A few keyboard controls for moving, focusing, cycling, closing.
+* A few keyboard controls for moving, focusing, cycling, closing, and finding windows.
 * Transient windows and dialogs are centered on parent, not tiled.
 * Splash screens and notification popups are displayed as requested, not tiled.
 * config.h for customization of borders and keys.

cerberus.c

@@ -30,6 +30,32 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include "proto.h"
 #include "config.h"
 
+void catch_exit(int sig)
+{
+	while (0 < waitpid(-1, NULL, WNOHANG));
+}
+
+int execsh(char *cmd)
+{
+	// use sh for args parsing
+	return execlp("/bin/sh", "sh", "-c", cmd, NULL);
+}
+
+// execute sub-process
+pid_t exec_cmd(char *cmd)
+{
+	if (!cmd || !cmd[0]) return -1;
+	signal(SIGCHLD, catch_exit);
+	pid_t pid = fork();
+	if (!pid)
+	{
+		setsid();
+		execsh(cmd);
+		exit(EXIT_FAILURE);
+	}
+	return pid;
+}
+
 // X error handler
 int oops(Display *d, XErrorEvent *ee)
 {
@@ -477,6 +503,36 @@ void client_active(client *c)
 	ewmh_active_window(c->window);
 }
 
+// real simple switcher/launcher
+void find_or_start(char *class)
+{
+	int i; stack all;
+	memset(&all, 0, sizeof(stack));
+	windows_visible(&all);
+	client *found = NULL;
+
+	for (i = 0; !found && i < all.depth; i++)
+	{
+		XClassHint chint;
+		client *c = all.clients[i];
+		if (c && c->manage && XGetClassHint(display, c->window, &chint))
+		{
+			if (!strcasecmp(chint.res_class, class) || !strcasecmp(chint.res_name, class))
+				found = c;
+
+			XFree(chint.res_class);
+			XFree(chint.res_name);
+		}
+	}
+	if (found)
+	{
+		client_raise(found);
+		client_active(found);
+		return;
+	}
+	exec_cmd(class);
+}
+
 // client events we care about
 void window_listen(Window win)
 {
@@ -606,15 +662,16 @@ void key_press(XKeyEvent *e)
 	latest = e->time;
 	client *c = window_client(current);
 
-	short act = ACTION_NONE;
+	short act = ACTION_NONE; void *data = NULL;
 	KeySym key = XkbKeycodeToKeysym(display, e->keycode, 0, 0);
 	unsigned int state = e->state & ~(LockMask|NumlockMask);
 
 	for (i = 0; i < sizeof(keys)/sizeof(binding); i++)
 	{
-		if (keys[i].key == key && keys[i].mod == state)
+		if (keys[i].key == key && (keys[i].mod == AnyModifier || keys[i].mod == state))
 		{
-			act = keys[i].act;
+			act  = keys[i].act;
+			data = keys[i].data;
 			break;
 		}
 	}
@@ -656,6 +713,9 @@ void key_press(XKeyEvent *e)
 		case ACTION_FOCUS_SPOT3:
 			spot_active(SPOT3, None);
 			break;
+		case ACTION_FIND_OR_START:
+			find_or_start(data);
+			break;
 	}
 	client_free(c);
 	ewmh_client_list();
@@ -713,6 +773,7 @@ void focus_change(XFocusChangeEvent *e)
 int main(int argc, char *argv[])
 {
 	int i, j;
+	signal(SIGCHLD, catch_exit);
 
 	if(!(display = XOpenDisplay(0))) return 1;
 
@@ -738,6 +799,9 @@ int main(int argc, char *argv[])
 	{
 		XGrabKey(display, XKeysymToKeycode(display, keys[i].key), keys[i].mod, root,
 			True, GrabModeAsync, GrabModeAsync);
+
+		if (keys[i].mod == AnyModifier) continue;
+
 		XGrabKey(display, XKeysymToKeycode(display, keys[i].key), keys[i].mod|LockMask, root,
 			True, GrabModeAsync, GrabModeAsync);
 		XGrabKey(display, XKeysymToKeycode(display, keys[i].key), keys[i].mod|NumlockMask, root,

cerberus.h

@@ -38,6 +38,8 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <unistd.h>
 #include <ctype.h>
 #include <err.h>
+#include <sys/types.h>
+#include <sys/wait.h>
 
 #define MAX(a, b) ((a) > (b) ? (a) : (b))
 #define MIN(a, b) ((a) < (b) ? (a) : (b))
@@ -118,7 +120,7 @@ enum {
 	ACTION_CYCLE,
 	ACTION_CLOSE,
 	ACTION_OTHER,
-	ACTION_STATE,
+	ACTION_FIND_OR_START,
 	ACTIONS
 };
 
@@ -126,6 +128,7 @@ typedef struct {
 	unsigned int mod;
 	KeySym key;
 	short act;
+	void *data;
 } binding;
 
 enum {

config.h

@@ -39,4 +39,9 @@ binding keys[] = {
 
 	// gracefully close the current window
 	{ .mod = Mod4Mask, .key = XK_Escape, .act = ACTION_CLOSE },
+
+	// find or start apps by WM_CLASS (case insensitive)
+	{ .mod = AnyModifier, .key = XK_F1, .act = ACTION_FIND_OR_START, .data = "urxvt"    },
+	{ .mod = AnyModifier, .key = XK_F2, .act = ACTION_FIND_OR_START, .data = "kate"     },
+	{ .mod = AnyModifier, .key = XK_F3, .act = ACTION_FIND_OR_START, .data = "chromium" },
 };

proto.h

@@ -1,3 +1,5 @@
+void catch_exit(int sig);
+int execsh(char *cmd);
 int oops(Display *d, XErrorEvent *ee);
 unsigned int color_get(const char *name);
 int window_get_prop(Window w, Atom prop, Atom *type, int *items, void *buffer, int bytes);
@@ -22,6 +24,7 @@ void client_stack(client *c, stack *all, stack *raise);
 void client_raise(client *c);
 void client_lower(client *c);
 void client_active(client *c);
+void find_or_start(char *class);
 void window_listen(Window win);
 void client_review(client *c);
 void create_notify(XCreateWindowEvent *e);