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;;; quilt.el v0.45.3 - a minor mode for working with files in quilt
;;; http://stakeuchi.sakura.ne.jp/dev/quilt-el
;;;
;;; Copyright 2005  Matt Mackall <mpm@selenic.com>
;;;
;;; Satoru Takeuchi<satoru.takeuchi@gmail.com> took over this package
;;; from Matt Mackall.
;;;
;;; This software may be used and distributed according to the terms
;;; of the GNU General Public License, incorporated herein by reference.
;;;
;;; Usage: add (load "~/quilt.el") to your .emacs file

(defun quilt-buffer-file-name-safe ()
  (let ((fn buffer-file-name))
    (if (and fn (file-exists-p fn))
	fn)))

(defun quilt-bottom-p ()
  (if (> (call-process "quilt" nil nil nil "applied") 0) 1))

(defun quilt-patches-directory ()
  (or (save-excursion
        (set-buffer (generate-new-buffer " *cmd"))
        (shell-command
         (concat "test -f ~/.quiltrc && . ~/.quiltrc ;"
                 "echo -n $QUILT_PATCHES")
         t)
        (unwind-protect
            (let ((v (buffer-string)))
              (if (string= "" (buffer-string))
                  nil
                v))
          (kill-buffer (current-buffer))))
      (or (getenv "QUILT_PATCHES")
          "patches")))

(defun quilt-find-dir (fn)
  "find the top level dir for quilt from fn"
  (if (or (not fn) (equal fn "/"))
      nil
    (let ((d (file-name-directory fn)))
      (if (file-accessible-directory-p (concat d "/.pc"))
	  d
	(quilt-find-dir (directory-file-name d))))))

(defun quilt-dir (&optional fn)
  (quilt-find-dir (if fn fn
		    (let ((fn2 (quilt-buffer-file-name-safe)))
		      (if fn2 fn2
			(if default-directory
			    (expand-file-name default-directory)))))))

(defun quilt-drop-dir (fn)
  (let ((d (quilt-find-dir fn)))
    (substring fn (length d) (length fn))))

(defun quilt-p (&optional fn)
  "check if the given file or current buffer is in a quilt tree"
  (if (quilt-dir fn) 't nil))

(defun quilt-save ()
  (save-some-buffers nil 'quilt-p))

(defun quilt-owned-p (fn)
  "check if the current buffer is quilt controlled"
  (if (not fn)
      nil
    (let ((pd (file-name-nondirectory
		(directory-file-name (file-name-directory fn)))))
      (and
       (not (string-match "\\(~$\\|\\.rej$\\)" fn))
       (not (equal pd (quilt-patches-directory)))
       (not (equal pd ".pc"))
       (quilt-p fn)))))

(defun quilt-cmd (cmd &optional buf)
  "execute a quilt command at the top of the quilt tree for the given buffer"
  (let ((d default-directory)
	 (qd (quilt-dir)))
    (if (not qd)
	(shell-command (concat "quilt " cmd) buf)
      (cd qd)
      (unwind-protect ; make sure to cd back even if an erro occurs.
	  (shell-command (concat "quilt " cmd) buf)
	(cd d)))))

(defun quilt-cmd-to-string (cmd)
  "execute a quilt command at the top of the quilt tree for the given buffer"
  (let ((d default-directory)
	 (qd (quilt-dir)))
    (if (not qd)
	nil
      (cd qd)
      (unwind-protect ; make sure to cd back even if an error occurs.
	  (shell-command-to-string (concat "quilt " cmd))
	(cd d)))))

(defun quilt-cmd-to-list (cmd)
  "execute a quilt command at the top of the quilt tree for the current buffer.
Return the lines of the command output as elements of a list."
  (let ((s (quilt-cmd-to-string cmd)))
    (if s
        (split-string s "\n" t))))

(defun quilt-applied-list ()
  (quilt-cmd-to-list "applied"))

(defun quilt-file-list ()
  (quilt-cmd-to-list "files"))

(defun quilt-patch-list ()
  (quilt-cmd-to-list "patches"))

(defun quilt-files-affected (&optional first last)
  (let ((qd (quilt-dir))
        files fp)
    (when qd
      (setq files (quilt-cmd-to-list
                   (if last
                       (if (equal first last)
                           (concat "files " first)
                         (concat "files --combine " first last))
                     (if first
                         (concat "files --combine " first)
                       "files"))))
      (setq fp files)
      (while fp
        (setcar fp (concat qd (car fp)))
        (setq fp (cdr fp)))
      files)))

(defun quilt-top-patch ()
  (if (quilt-bottom-p)
      nil
    (file-name-nondirectory
     (substring (quilt-cmd-to-string "top")  0 -1))))

(defun quilt-complete-list (p l)
  ; First turn the list into an alist using indices as keys.
  ; This modifies the list passed as an argument.
  (let ((list l)
	(n 0))
    (while list
      (setcar list (cons (car list) n))
      (setq list (cdr list))
      (setq n (1+ n))))
  (completing-read p l nil t))

(defun quilt-editable (f)
  (let ((qd (quilt-dir))
	 (fn (quilt-drop-dir f))
	 dirs result)
    (if qd
	(if (quilt-bottom-p)
	    (quilt-cmd "applied")	; to print error message
	  (setq dirs (if quilt-edit-top-only
			 (list (quilt-top-patch))
			 (cdr (cdr (directory-files (concat qd ".pc/"))))))
	  (while (and (not result) dirs)
	    (if (file-exists-p (concat qd ".pc/" (car dirs) "/" fn))
		(setq result t)
	      (setq dirs (cdr dirs))))
	  result))))

(defun quilt-short-patchname ()
  (let ((p (quilt-top-patch)))
    (if (not p)
	"none"
      (let ((p2 (file-name-sans-extension p)))
	   (if (< (length p2) 10)
	       p2
	     (concat (substring p2 0 8) ".."))))))

(defvar quilt-mode-line nil)
(make-variable-buffer-local 'quilt-mode-line)

(defun quilt-update-modeline ()
  (interactive)
  (setq quilt-mode-line
	(concat " Q:" (quilt-short-patchname)))
  (force-mode-line-update))

(defun quilt-revert (filelist)
  "Refresh contents, editability and modeline of buffers.
The buffers won't be touched unless their file is a child of the
current quilt directory. The filelist should contain the absolute
file names of those files affected by the latest quilt
operation. Their buffers get reverted to update their
contents. Other buffers will only get their modeline and
editability adjusted."
  (let ((qd (quilt-dir))
	fn)
    (dolist (buf (buffer-list))
      (if (not (string-match "^ " (buffer-name buf)))
	(save-excursion
	  (set-buffer buf)
	  (setq fn (quilt-buffer-file-name-safe))
	  (when (string-equal qd (quilt-dir))
	    (quilt-update-modeline)
	    (when (and (not (buffer-modified-p))
		       (quilt-owned-p fn))
	      ;; If the file doesn't exist on disk it can't be reverted, but we
	      ;; need the revert hooks to run anyway so that the buffer's
	      ;; editability will update. Files not affected by the latest change
	      ;; (as listed in filelist) don't need to get reverted either.
	      (if (and (file-exists-p buffer-file-name)
		       (member fn filelist))
		  (progn
		    (revert-buffer t t t))
		(run-hooks 'after-revert-hook)))))))))

(defun quilt-push (arg)
  "Push next patch, force with prefix arg"
  (interactive "P")
  (quilt-save)
  (if arg
      (quilt-cmd "push -f" "*quilt*")
    (quilt-cmd "push -q"))
  (quilt-revert (quilt-files-affected)))

(defun quilt-pop (arg)
  "Pop top patch, force with prefix arg"
  (interactive "P")
  (quilt-save)
  (if arg
      (quilt-cmd "pop -f")
    (quilt-cmd "pop -q"))
  (quilt-revert (quilt-files-affected)))

(defun quilt-push-all (arg)
  "Push all remaining patches"
  (interactive "P")
  (quilt-save)
  (let ((next (car (quilt-cmd-to-list "next"))))
    (if arg
	(quilt-cmd "push -f" "*quilt*")
      (quilt-cmd "push -qa"))
    (quilt-revert (quilt-files-affected next))))

(defun quilt-pop-all (arg)
  "Pop all applied patches, force with prefix arg"
  (interactive "P")
  (quilt-save)
  (let ((fa (quilt-files-affected "-")))
    (if arg
	(quilt-cmd "pop -af")
      (quilt-cmd "pop -qa"))
    (quilt-revert fa)))

(defun quilt-goto ()
  "Go to a specified patch"
  (interactive)
  (let ((qd (quilt-dir)))
    (if (not qd)
	(quilt-cmd "push")		; to print error message
      (let ((arg (quilt-complete-list "Goto patch: " (quilt-patch-list))))
	(if (string-equal arg "")
	    (message "no patch name is supplied")
	  (quilt-save)
	  (let (cmd first last)
	    (if (file-exists-p (concat qd ".pc/" arg))
		(progn
		  (setq cmd "pop")
		  (setq first (car (quilt-cmd-to-list (concat "next " arg))))
		  (setq last (quilt-top-patch)))
	      (setq cmd "push")
	      (setq last arg)
	      (setq first (if (quilt-bottom-p)
			      "-"
			    (car (quilt-cmd-to-list "next")))))
	    (quilt-cmd (concat cmd " -q " arg) "*quilt*")
	  (quilt-revert (quilt-files-affected first last))))))))

(defun quilt-top ()
  "Display topmost patch"
  (interactive)
  (quilt-cmd "top"))

(defun quilt-find-file ()
  "Find a file in the topmost patch"
  (interactive)
  (let ((qd (quilt-dir)))
    (if (not qd)
	(quilt-cmd "push")		; to print error message
      (if (quilt-bottom-p)
	  (quilt-cmd "applied")		; to print error message
	(let ((l (quilt-file-list)))
	  (if (not l)
	      (message "no file is existed in this patch")
	    (let ((f (quilt-complete-list "File: " l)))
	      (if (string-equal f "")
		  (message "file name is not specified")
		(find-file (concat qd f))))))))))

(defun quilt-files ()
  "Display files in topmost patch"
  (interactive)
  (quilt-cmd "files"))

(defun quilt-import (fn pn)
  "Import external patch"
  (interactive "fPatch to import: \nsPatch name: ")
  (if (not pn)
      (message "no patch name supplied")
    (quilt-cmd (concat "import -p " pn ".patch " (if fn fn pn)))))

(defun quilt-diff ()
  "Display diff of current changes"
  (interactive)
  (quilt-save)
  (quilt-cmd "diff" "*diff*"))

(defun quilt-new (f)
  "Create a new patch"
  (interactive "sPatch name: ")
  (if (string-equal f "")
      (message "no patch name is supplied")
    (quilt-save)
    (quilt-cmd (concat "new " f ".patch"))
    (quilt-revert nil)))

(defun quilt-applied ()
  "Show applied patches"
  (interactive)
  (quilt-cmd "applied" "*quilt*"))

(defun quilt-add (arg)
  "Add a file to the current patch"
  (interactive "b")
  (save-excursion
    (set-buffer arg)
    (let ((fn (quilt-buffer-file-name-safe)))
      (cond
       ((not fn)
	(message "buffer %s is not associated with any buffer" (buffer-name)))
       ((not (quilt-dir))
	(quilt-cmd (concat "push")))	; to print error message
       (t
	(quilt-cmd (concat "add " (quilt-drop-dir fn)))
	(quilt-revert (list fn)))))))

(defun quilt-edit-patch ()
  "Edit the topmost patch"
  (interactive)
  (let ((qd (quilt-dir)))
    (if (not qd)
	(quilt-cmd "push")		; to print error message
      (let ((patch (quilt-top-patch)))
	(if (not patch)
	    (quilt-cmd "applied")	; to print error message
	  (quilt-save)
	  (let ((pf (concat qd
			    (format "/%s/" (quilt-patches-directory))
			    patch)))
	    (if (file-exists-p pf)
		(progn (find-file pf)
		       (toggle-read-only))
	      (message (format "%s doesn't exist yet." pf)))))))))

(defun quilt-patches ()
  "Show which patches modify the current buffer"
  (interactive)
  (let ((fn (quilt-buffer-file-name-safe)))
    (cond
     ((not fn)
      (message "buffer %s is not associated with any buffer" (buffer-name)))
     ((not (quilt-dir))
      (quilt-cmd "push"))		; to print error message
     (t
      (quilt-cmd (concat "patches " (quilt-drop-dir fn)))))))

(defun quilt-unapplied ()
  "Display unapplied patch list"
  (interactive)
  (quilt-cmd "unapplied" "*quilt*"))

(defun quilt-refresh ()
  "Refresh the current patch"
  (interactive)
  (quilt-save)
  (quilt-cmd "refresh"))

(defun quilt-remove ()
  "Remove a file from the current patch and revert it"
  (interactive)
  (let ((f (quilt-buffer-file-name-safe)))
    (cond
     ((not f)
      (message "buffer %s is not associated with any patch" (buffer-name)))
     ((not (quilt-dir))
      (quilt-cmd "push")) ; to print error message
     (t
      (if (quilt-bottom-p)
	  (quilt-cmd "applied")		; to print error message
	(let ((dropped (quilt-drop-dir f)))
	  (if (y-or-n-p (format "Really drop %s? " dropped))
	      (progn
		(quilt-cmd (concat "remove " dropped))
		(quilt-revert (list f))))))))))

(defun quilt-edit-series ()
  "Edit the patch series file"
  (interactive)
  (let ((qd (quilt-dir)))
    (if (not qd)
	(quilt-cmd "push")		; to print error message
      (let ((series (concat qd
			     (format "/%s/series" (quilt-patches-directory)))))
	(if (file-exists-p series)
	    (find-file series)
	  (message (quilt-top-patch)))))))

(defun quilt-header (arg)
  "Print the header of a patch"
  (interactive "P")
  (let ((qd (quilt-dir)))
    (if (not qd)
	(quilt-cmd "push")		; to print error message
      (if (not arg)
	  (quilt-cmd "header")
	(let ((p (quilt-complete-list "Patch: " (quilt-patch-list))))
	  (if (string-equal p "")
	      (message "no patch name is supplied")
	    (quilt-cmd (concat "header " p))))))))

(defun quilt-delete (arg)
  "Delete a patch from the series file"
  (interactive "P")
  (let ((qd (quilt-dir)))
    (if (not qd)
	(quilt-cmd "push")		; to print error message
      (let ((p (if arg
		   (quilt-complete-list "Delete patch: " (quilt-patch-list))
		 (quilt-top-patch))))
	(if (string-equal p "")
	    (message "no patch name is supplied")
	  (if (not p)
	      (quilt-cmd "applied")	; to print error message
	    (if (y-or-n-p (format "Really delete %s?" p))
		(let ((fa (quilt-files-affected p p)))
		  (quilt-save)
		  (quilt-cmd (concat "delete " p))
		  (quilt-revert fa)))))))))

(defun quilt-header-commit ()
  "commit to change patch header"
  (interactive)
  (let ((tmp (make-temp-file "quilt-header-")))
    (set-visited-file-name tmp)
    (basic-save-buffer)
    (cd quilt-header-directory)
    (shell-command (concat "EDITOR=cat quilt -r header <" tmp))
    (kill-buffer (current-buffer))
    (delete-file tmp)))

(defvar quilt-header-mode-map (make-keymap))
(define-key quilt-header-mode-map "\C-c\C-c" 'quilt-header-commit)

(defun quilt-edit-header (arg)
  "Edit the header of a patch"
  (interactive "P")
  (let ((qd (quilt-dir)))
    (if (not qd)
	(quilt-cmd "push")		; to print error message
      (let ((p (if arg
		   (quilt-complete-list "Edit patch: " (quilt-patch-list))
		 (quilt-top-patch))))
	  (if (string-equal p "")
	      (message "no patch name is supplied")
	    (if (not p)
		(quilt-cmd "applied")	; to print error message
	      (let ((qb (get-buffer-create (format " *quilt-heaer(%s)*" p))))
		(switch-to-buffer-other-window qb)
		(erase-buffer)
		(kill-all-local-variables)
		(make-local-variable 'quilt-header-directory)
		(setq quilt-header-directory default-directory)
		(setq mode-map "quilt-header")
		(use-local-map quilt-header-mode-map)
		(setq major-mode 'quilt-header-mode)
		(call-process "quilt" nil qb nil "header" p)
		(goto-char 0))))))))

(defun quilt-series (arg)
  "Show patche series."
  (interactive "P")
  (if arg
      (quilt-cmd "series -v")
    (quilt-cmd "series")))

(defvar quilt-mode-map (make-sparse-keymap))
(define-key quilt-mode-map "\C-c.t" 'quilt-top)
(define-key quilt-mode-map "\C-c.f" 'quilt-find-file)
(define-key quilt-mode-map "\C-c.F" 'quilt-files)
(define-key quilt-mode-map "\C-c.d" 'quilt-diff)
(define-key quilt-mode-map "\C-c.p" 'quilt-push)
(define-key quilt-mode-map "\C-c.o" 'quilt-pop)
(define-key quilt-mode-map "\C-c.P" 'quilt-push-all)
(define-key quilt-mode-map "\C-c.O" 'quilt-pop-all)
(define-key quilt-mode-map "\C-c.g" 'quilt-goto)
(define-key quilt-mode-map "\C-c.A" 'quilt-applied)
(define-key quilt-mode-map "\C-c.n" 'quilt-new)
(define-key quilt-mode-map "\C-c.i" 'quilt-import)
(define-key quilt-mode-map "\C-c.a" 'quilt-add)
(define-key quilt-mode-map "\C-c.e" 'quilt-edit-patch)
(define-key quilt-mode-map "\C-c.m" 'quilt-patches)
(define-key quilt-mode-map "\C-c.u" 'quilt-unapplied)
(define-key quilt-mode-map "\C-c.r" 'quilt-refresh)
(define-key quilt-mode-map "\C-c.R" 'quilt-remove)
(define-key quilt-mode-map "\C-c.s" 'quilt-series)
(define-key quilt-mode-map "\C-c.S" 'quilt-edit-series)
(define-key quilt-mode-map "\C-c.h" 'quilt-header)
(define-key quilt-mode-map "\C-c.H" 'quilt-edit-header)
(define-key quilt-mode-map "\C-c.D" 'quilt-delete)

(defvar quilt-mode nil)
(make-variable-buffer-local 'quilt-mode)
(defvar quilt-edit-top-only 't)

(defun quilt-mode (&optional arg)
  "Toggle quilt-mode. With positive arg, enable quilt-mode.

\\{quilt-mode-map}
"
  (interactive "P")
  (setq quilt-mode
	(if (null arg)
	    (not quilt-mode)
	  (> (prefix-numeric-value arg) 0)))
  (if quilt-mode
      (let ((f (quilt-buffer-file-name-safe)))
	(if (quilt-owned-p f)
	    (if (not (quilt-editable f))
		(toggle-read-only 1)
	      (toggle-read-only 0)))
	(quilt-update-modeline))))

(defun quilt-hook ()
  "Enable quilt mode for quilt-controlled files."
  (if (quilt-p) (quilt-mode 1)))

(add-hook 'find-file-hooks 'quilt-hook)
(add-hook 'after-revert-hook 'quilt-hook)

(or (assq 'quilt-mode minor-mode-alist)
    (setq minor-mode-alist
	  (cons '(quilt-mode quilt-mode-line) minor-mode-alist)))

(or (assq 'quilt-mode-map minor-mode-map-alist)
    (setq minor-mode-map-alist
	  (cons (cons 'quilt-mode quilt-mode-map) minor-mode-map-alist)))