1 files changed, 47 insertions, 0 deletions
diff --git a/emacs/.config/emacs/lisp/kj-timer.el b/emacs/.config/emacs/lisp/kj-timer.el
new file mode 100644
index 0000000..6e200a7
--- /dev/null
+++ b/emacs/.config/emacs/lisp/kj-timer.el
@@ -0,0 +1,47 @@
+;;; kj-timer.el -- countdown timer -*- lexical-binding: t -*-
+
+(defun kj/display-timer (seconds current &optional next)
+  (with-current-buffer (get-buffer-create "*timer*")
+    (let* ((stopped (< seconds 0))
+           (seconds (if stopped 0 (truncate seconds))))
+      (erase-buffer)
+      (insert
+       (propertize (format "%02d:%02d" (/ seconds 60)
+                           (% seconds 60))
+                   'face
+                   (append '(:height 1000)
+                           (when stopped
+                             '(:inherit 'org-imminent-deadline))))
+       "\n" (propertize (concat current " · " (if next next "done"))
+                        'face '(:foreground "gray" :height 500)))
+      (set-left-margin (point-min) (point-max) 10))))
+
+(defvar kj/current-timer nil)
+(defvar kj/roster nil)
+(defvar kj/timer-seconds)
+
+(defun kj/run-single-timer (seconds current next)
+  (let* ((stop-time (+ (float-time) seconds))
+         (display-fn (lambda ()
+                       (kj/display-timer
+                        (- stop-time (float-time))
+                        current next))))
+    (setq kj/current-timer (run-at-time t 0.5 display-fn))))
+
+(defun kj/timer (seconds &rest roster)
+  (with-current-buffer (get-buffer-create "*timer*")
+    (display-buffer (current-buffer))
+    (setq cursor-type nil)
+    (use-local-map (define-keymap "SPC" 'kj/timer-next))
+    (setq kj/roster roster)
+    (setq kj/timer-seconds seconds)
+    (kj/timer-next)))
+
+(defun kj/timer-next ()
+  (interactive)
+  (unless kj/roster
+    (error "The timers are done."))
+  (when kj/current-timer
+    (cancel-timer kj/current-timer))
+  (kj/run-single-timer kj/timer-seconds (nth 0 kj/roster) (nth 1 kj/roster))
+  (setq kj/roster (cdr kj/roster)))