Add run-or-raise function for herbstluftwm

herbstluftwm/.config/herbstluftwm/autostart

@@ -65,9 +65,10 @@ hc keybind $Mod-Shift-k remove
 
 # These are my most-used programs, having specific keybindings for
 # them is a big productivity boost.
-hc keybind $Mod-Return spawn ${TERMINAL:-urxvt}
+hc keybind $Mod-Return spawn urxvt
-hc keybind $Mod-t spawn ${EDITOR:-emacs}
+hc keybind $Mod-c spawn hlwm-run-or-raise URxvt urxvt
-hc keybind $Mod-b spawn ${BROWSER:-conkeror}
+hc keybind $Mod-t spawn hlwm-run-or-raise Emacs emacs
+hc keybind $Mod-b spawn hlwm-run-or-raise Conkeror conkeror
 
 # Since I use the colemak keyboard layout, hjkl doesn't make much
 # sense. I use neio instead since that is almost in the same place
@@ -126,7 +127,6 @@ hc mousebind $Mod-Button3 resize
 hc keybind $Mod-BackSpace   cycle_monitor
 hc keybind $Mod-Tab         cycle_all +1
 hc keybind $Mod-Shift-Tab   cycle_all -1
-hc keybind $Mod-c cycle
 
 # Use u because i is already used by by navigation commands.
 hc keybind $Mod-u jumpto urgent

herbstluftwm/usr/bin/hlwm-run-or-raise

@@ -0,0 +1,43 @@
+#!/usr/local/bin/scsh -s
+!#
+;; hrunorraise --- Raise a window or start a new process
+;;
+;; Tries to find a window ID for a window with a given class value. If
+;; no such window can be found treat the rest of the command line as
+;; the command to start.
+;;
+;; This script depends on both herbstluftwm and wmctrl.
+
+(define (get-current-window-id)
+  (let* ((output (run/string (wmctrl -v -a ":ACTIVE:") (= 2 1)))
+         (re (rx "Using window: "
+                 (submatch "0x" (+ hex-digit))
+                 "\n"))
+         (match (regexp-search re output)))
+    (match:substring match 1)))
+
+(define (pull-element-to-front elt collection)
+  (if (string= (car collection) elt)
+      collection
+      (pull-element-to-front elt (rotate collection))))
+
+(define (rotate lst)
+  (append (cdr lst) (list (car lst))))
+
+(define current-window-id
+  (get-current-window-id))
+
+(define window-ids
+  (run/strings
+   (pipe (wmctrl -lx)
+         (awk "{ print $1, $3 }")
+         (grep ,(string-append "\\." (car command-line-arguments)))
+         (awk "{ print $1 }"))))
+
+(if (not (null? window-ids))
+    (let ((next-window
+           (if (member current-window-id window-ids)
+               (cadr (pull-element-to-front current-window-id window-ids))
+               (car window-ids))))
+      (run (herbstclient jumpto ,next-window)))
+    (exec-epf (,@(cdr command-line-arguments))))