给xbindkeys添加key sequence支持

xbindkeys不支持emacs风格的key sequence，不过由于它可以调用guile来支持scheme的配置文件。xbindkeys的tarball里有一个配置文件，支持key sequence的特殊形式：两个键的序列。

最近正好学了些scheme，就好好折腾了一把，写了一份配置文件，可以支持任意长的key sequence(当然太长的一般用不到)。

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(define (delete-duplicates l)
  (cond ((null? l) '())
        ((memq (car l) (cdr l)) (delete-duplicates (cdr l)))
        (else (cons (car l) (delete-duplicates (cdr l))))
        )
  )

(define global-map '())

(define (register keys action)
  (define (loop getmap setmap keys)
    (if (null? keys)
        (setmap action)
        (let ((k (car keys)))
          (if (eq? #f (assoc k (getmap)))
              (setmap (assoc-set! (getmap) k '())))
          (loop (lambda () (cdr (assoc k (getmap))))
                (lambda (m) (setmap (assoc-set! (getmap) k m)))
                (cdr keys))
          )
        )
    )
  (loop (lambda () global-map) (lambda (m) (set! global-map m)) keys)
  )

(define (grab keymap)
  (define (proc k)
    (define action (cdr (assoc k keymap)))
    (ungrab-all-keys)
    (remove-all-keys)
    (if (string? action)
        (begin
          (run-command action)
          (reset-first-binding)
          )
        (grab action)
        )
    (grab-all-keys)
    )
  (map (lambda (k)
         (xbindkey-function k (lambda () (proc k)))
         ) (delete-duplicates (map car keymap)))
  (if (not (eq? global-map keymap))
      (xbindkey-function '(control g) (lambda () (reset-first-binding)))
      )
  )

(define (first-binding)
  (grab global-map)
  )

(define (reset-first-binding)
  (ungrab-all-keys)
  (remove-all-keys)
  (first-binding)
  (grab-all-keys))

(define (simple s)
  (string-concatenate `("wmctrl -xa " ,s "||" ,s))
  )

(register '((control semicolon) x) (simple "xterm"))
(register '((control semicolon) u) "wmctrl tmux || -T tmux -e tmux attach -t default")
(register '((control semicolon) e) "wmctrl -xa Emacs || emacsclient -c -n")
(register '((control semicolon) v) "wmctrl -xa Vim || gvim")
(register '((control semicolon) f) (simple "firefox"))
(register '((control semicolon) i) (simple "evince"))
(register '((control semicolon) (control semicolon)) "xdotool send ctrl+semicolon")

(first-binding)

用法很简单，模仿代码中的(register ...)，在这串键绑定里添删你自己的。xbindkeys还支持shift mod3 release等修饰符。release指的是键释放时而不是press时执行动作。xbindkeys -d还有其他一些关于修饰符的例子。

我的键绑定中wmctrl -xa是一个用外部命令搭建的简易jump-or-exec，wmctrl会检查窗口title和class，如果不存在则执行，否则给相应窗口焦点。(simple ...)针对的是title和class相同的情况。

两次control semicolon被我映射为产生一个control semicolon，key sequence按到一半时按control g是取消。