221 lines
8.6 KiB
EmacsLisp
221 lines
8.6 KiB
EmacsLisp
;;; org-git-link.el --- Provide org links to specific file version
|
||
|
||
;; Copyright (C) 2009-2011 Reimar Finken
|
||
|
||
;; Author: Reimar Finken <reimar.finken@gmx.de>
|
||
;; Keywords: files, calendar, hypermedia
|
||
|
||
;; This program is free software; you can redistribute it and/or modify
|
||
;; it under the terms of the GNU General Public License as published by
|
||
;; the Free Software Foundation, either version 3 of the License, or
|
||
;; (at your option) any later version.
|
||
|
||
;; This program is distaributed in the hope that it will be useful,
|
||
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
;; GNU General Public License for more details.
|
||
|
||
;; You should have received a copy of the GNU General Public License
|
||
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
||
;;; Commentary:
|
||
|
||
;; `org-git-link.el' defines two new link types. The `git' link
|
||
;; type is meant to be used in the typical scenario and mimics the
|
||
;; `file' link syntax as closely as possible. The `gitbare' link
|
||
;; type exists mostly for debugging reasons, but also allows e.g.
|
||
;; linking to files in a bare git repository for the experts.
|
||
|
||
;; * User friendy form
|
||
;; [[git:/path/to/file::searchstring]]
|
||
|
||
;; This form is the familiar from normal org file links
|
||
;; including search options. However, its use is
|
||
;; restricted to files in a working directory and does not
|
||
;; handle bare repositories on purpose (see the bare form for
|
||
;; that).
|
||
|
||
;; The search string references a commit (a tree-ish in Git
|
||
;; terminology). The two most useful types of search strings are
|
||
|
||
;; - A symbolic ref name, usually a branch or tag name (e.g.
|
||
;; master or nobelprize).
|
||
;; - A ref followed by the suffix @ with a date specification
|
||
;; enclosed in a brace pair (e.g. {yesterday}, {1 month 2
|
||
;; weeks 3 days 1 hour 1 second ago} or {1979-02-26 18:30:00})
|
||
;; to specify the value of the ref at a prior point in time
|
||
;;
|
||
;; * Bare git form
|
||
;; [[gitbare:$GIT_DIR::$OBJECT]]
|
||
;;
|
||
;; This is the more bare metal version, which gives the user most
|
||
;; control. It directly translates to the git command
|
||
;; git --no-pager --git-dir=$GIT_DIR show $OBJECT
|
||
;; Using this version one can also view files from a bare git
|
||
;; repository. For detailed information on how to specify an
|
||
;; object, see the man page of `git-rev-parse' (section
|
||
;; SPECIFYING REVISIONS). A specific blob (file) can be
|
||
;; specified by a suffix clolon (:) followed by a path.
|
||
|
||
;;; Code:
|
||
|
||
(require 'org)
|
||
(defcustom org-git-program "git"
|
||
"Name of the git executable used to follow git links."
|
||
:type '(string)
|
||
:group 'org)
|
||
|
||
;; org link functions
|
||
;; bare git link
|
||
(org-add-link-type "gitbare" 'org-gitbare-open)
|
||
|
||
(defun org-gitbare-open (str)
|
||
(let* ((strlist (org-git-split-string str))
|
||
(gitdir (first strlist))
|
||
(object (second strlist)))
|
||
(org-git-open-file-internal gitdir object)))
|
||
|
||
|
||
(defun org-git-open-file-internal (gitdir object)
|
||
(let* ((sha (org-git-blob-sha gitdir object))
|
||
(tmpdir (concat temporary-file-directory "org-git-" sha))
|
||
(filename (org-git-link-filename object))
|
||
(tmpfile (expand-file-name filename tmpdir)))
|
||
(unless (file-readable-p tmpfile)
|
||
(make-directory tmpdir)
|
||
(with-temp-file tmpfile
|
||
(org-git-show gitdir object (current-buffer))))
|
||
(org-open-file tmpfile)
|
||
(set-buffer (get-file-buffer tmpfile))
|
||
(setq buffer-read-only t)))
|
||
|
||
;; user friendly link
|
||
(org-add-link-type "git" 'org-git-open)
|
||
|
||
(defun org-git-open (str)
|
||
(let* ((strlist (org-git-split-string str))
|
||
(filepath (first strlist))
|
||
(commit (second strlist))
|
||
(dirlist (org-git-find-gitdir (file-truename filepath)))
|
||
(gitdir (first dirlist))
|
||
(relpath (second dirlist)))
|
||
(org-git-open-file-internal gitdir (concat commit ":" relpath))))
|
||
|
||
|
||
;; Utility functions (file names etc)
|
||
|
||
(defun org-git-split-dirpath (dirpath)
|
||
"Given a directory name, return '(dirname basname)"
|
||
(let ((dirname (file-name-directory (directory-file-name dirpath)))
|
||
(basename (file-name-nondirectory (directory-file-name dirpath))))
|
||
(list dirname basename)))
|
||
|
||
;; finding the git directory
|
||
(defun org-git-find-gitdir (path)
|
||
"Given a file (not necessarily existing) file path, return the
|
||
a pair (gitdir relpath), where gitdir is the path to the first
|
||
.git subdirectory found updstream and relpath is the rest of
|
||
the path. Example: (org-git-find-gitdir
|
||
\"~/gitrepos/foo/bar.txt\") returns
|
||
'(\"/home/user/gitrepos/.git\" \"foo/bar.txt\"). When not in a git repository, return nil."
|
||
(let ((dir (file-name-directory path))
|
||
(relpath (file-name-nondirectory path)))
|
||
(catch 'toplevel
|
||
(while (not (file-exists-p (expand-file-name ".git" dir)))
|
||
(let ((dirlist (org-git-split-dirpath dir)))
|
||
(when (string= (second dirlist) "") ; at top level
|
||
(throw 'toplevel nil))
|
||
(setq dir (first dirlist)
|
||
relpath (concat (file-name-as-directory (second dirlist)) relpath))))
|
||
(list (expand-file-name ".git" dir) relpath))))
|
||
|
||
|
||
(if (featurep 'xemacs)
|
||
(defalias 'org-git-gitrepos-p 'org-git-find-gitdir)
|
||
(defalias 'org-git-gitrepos-p 'org-git-find-gitdir
|
||
"Return non-nil if path is in git repository"))
|
||
|
||
;; splitting the link string
|
||
|
||
;; Both link open functions are called with a string of
|
||
;; consisting of two parts separated by a double colon (::).
|
||
(defun org-git-split-string (str)
|
||
"Given a string of the form \"str1::str2\", return a list of
|
||
two substrings \'(\"str1\" \"str2\"). If the double colon is mising, take str2 to be the empty string."
|
||
(let ((strlist (split-string str "::")))
|
||
(cond ((= 1 (length strlist))
|
||
(list (car strlist) ""))
|
||
((= 2 (length strlist))
|
||
strlist)
|
||
(t (error "org-git-split-string: only one :: allowed: %s" str)))))
|
||
|
||
;; finding the file name part of a commit
|
||
(defun org-git-link-filename (str)
|
||
"Given an object description (see the man page of
|
||
git-rev-parse), return the nondirectory part of the referenced
|
||
filename, if it can be extracted. Otherwise, return a valid
|
||
filename."
|
||
(let* ((match (and (string-match "[^:]+$" str)
|
||
(match-string 0 str)))
|
||
(filename (and match (file-name-nondirectory match)))) ;extract the final part without slash
|
||
filename))
|
||
|
||
;; creating a link
|
||
(defun org-git-create-searchstring (branch timestring)
|
||
(concat branch "@{" timestring "}"))
|
||
|
||
|
||
(defun org-git-create-git-link (file)
|
||
"Create git link part to file at specific time"
|
||
(interactive "FFile: ")
|
||
(let* ((gitdir (first (org-git-find-gitdir (file-truename file))))
|
||
(branchname (org-git-get-current-branch gitdir))
|
||
(timestring (format-time-string "%Y-%m-%d" (current-time))))
|
||
(org-make-link "git:" file "::" (org-git-create-searchstring branchname timestring))))
|
||
|
||
(defun org-git-store-link ()
|
||
"Store git link to current file."
|
||
(when (buffer-file-name)
|
||
(let ((file (abbreviate-file-name (buffer-file-name))))
|
||
(when (org-git-gitrepos-p file)
|
||
(org-store-link-props
|
||
:type "git"
|
||
:link (org-git-create-git-link file))))))
|
||
|
||
(add-hook 'org-store-link-functions 'org-git-store-link)
|
||
|
||
(defun org-git-insert-link-interactively (file searchstring &optional description)
|
||
(interactive "FFile: \nsSearch string: \nsDescription: ")
|
||
(insert (org-make-link-string (org-make-link "git:" file "::" searchstring) description)))
|
||
|
||
;; Calling git
|
||
(defun org-git-show (gitdir object buffer)
|
||
"Show the output of git --git-dir=gitdir show object in buffer."
|
||
(unless
|
||
(zerop (call-process org-git-program nil buffer nil
|
||
"--no-pager" (concat "--git-dir=" gitdir) "show" object))
|
||
(error "git error: %s " (save-excursion (set-buffer buffer)
|
||
(buffer-string)))))
|
||
|
||
(defun org-git-blob-sha (gitdir object)
|
||
"Return sha of the referenced object"
|
||
(with-temp-buffer
|
||
(if (zerop (call-process org-git-program nil t nil
|
||
"--no-pager" (concat "--git-dir=" gitdir) "rev-parse" object))
|
||
(buffer-substring (point-min) (1- (point-max))) ; to strip off final newline
|
||
(error "git error: %s " (buffer-string)))))
|
||
|
||
(defun org-git-get-current-branch (gitdir)
|
||
"Return the name of the current branch."
|
||
(with-temp-buffer
|
||
(if (not (zerop (call-process org-git-program nil t nil
|
||
"--no-pager" (concat "--git-dir=" gitdir) "symbolic-ref" "-q" "HEAD")))
|
||
(error "git error: %s " (buffer-string))
|
||
(goto-char (point-min))
|
||
(if (looking-at "^refs/heads/") ; 11 characters
|
||
(buffer-substring 12 (1- (point-max))))))) ; to strip off final newline
|
||
|
||
(provide 'org-git-link)
|
||
|
||
;;; org-git-link.el ends here
|