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;;; org-attach-git.el --- Automatic git commit extension to org-attach -*- lexical-binding: t; -*-
;; Copyright (C) 2019-2021 Free Software Foundation, Inc.
;; Original Author: John Wiegley <johnw@newartisans.com>
;; Restructurer: Gustav Wikström <gustav@whil.se>
;; Keywords: org data git
;; This file is part of GNU Emacs.
;;
;; GNU Emacs 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.
;; GNU Emacs is distributed 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; An extension to org-attach. If `org-attach-id-dir' is initialized
;; as a Git repository, then `org-attach-git' will automatically commit
;; changes when it sees them. Requires git-annex.
;;; Code:
(require 'org-attach)
(require 'vc-git)
(defcustom org-attach-git-annex-cutoff (* 32 1024)
"If non-nil, files larger than this will be annexed instead of stored."
:group 'org-attach
:version "24.4"
:package-version '(Org . "8.0")
:type '(choice
(const :tag "None" nil)
(integer :tag "Bytes")))
(defcustom org-attach-git-annex-auto-get 'ask
"Confirmation preference for automatically getting annex files.
If \\='ask, prompt using `y-or-n-p'. If t, always get. If nil, never get."
:group 'org-attach
:package-version '(Org . "9.0")
:version "26.1"
:type '(choice
(const :tag "confirm with `y-or-n-p'" ask)
(const :tag "always get from annex if necessary" t)
(const :tag "never get from annex" nil)))
(defcustom org-attach-git-dir 'default
"Attachment directory with the Git repository to use.
The default value is to use `org-attach-id-dir'. When set to
`individual-repository', then the directory attached to the
current node, if correctly initialized as a Git repository, will
be used instead."
:group 'org-attach
:package-version '(Org . "9.5")
:type '(choice
(const :tag "Default" default)
(const :tag "Individual repository" individual-repository)))
(defun org-attach-git-use-annex ()
"Return non-nil if git annex can be used."
(let ((git-dir (vc-git-root
(cond ((eq org-attach-git-dir 'default)
(expand-file-name org-attach-id-dir))
((eq org-attach-git-dir 'individual-repository)
(org-attach-dir))))))
(and org-attach-git-annex-cutoff
(or (file-exists-p (expand-file-name "annex" git-dir))
(file-exists-p (expand-file-name ".git/annex" git-dir))))))
(defun org-attach-git-annex-get-maybe (path)
"Call git annex get PATH (via shell) if using git annex.
Signals an error if the file content is not available and it was not retrieved."
(let* ((default-directory
(cond ((eq org-attach-git-dir 'default)
(expand-file-name org-attach-id-dir))
((eq org-attach-git-dir 'individual-repository)
(org-attach-dir))))
(path-relative (file-relative-name path)))
(when (and (org-attach-git-use-annex)
(not
(string-equal
"found"
(shell-command-to-string
(format "git annex find --format=found --in=here %s"
(shell-quote-argument path-relative))))))
(let ((should-get
(if (eq org-attach-git-annex-auto-get 'ask)
(y-or-n-p (format "Run git annex get %s? " path-relative))
org-attach-git-annex-auto-get)))
(unless should-get
(error "File %s stored in git annex but unavailable" path))
(message "Running git annex get \"%s\"." path-relative)
(call-process "git" nil nil nil "annex" "get" path-relative)))))
(defun org-attach-git-commit (&optional _)
"Commit changes to git if `org-attach-id-dir' is properly initialized.
This checks for the existence of a \".git\" directory in that directory.
Takes an unused optional argument for the sake of being compatible
with hook `org-attach-after-change-hook'."
(let* ((dir (cond ((eq org-attach-git-dir 'default)
(expand-file-name org-attach-id-dir))
((eq org-attach-git-dir 'individual-repository)
(org-attach-dir))))
(git-dir (vc-git-root dir))
(use-annex (org-attach-git-use-annex))
(changes 0))
(when (and git-dir (executable-find "git"))
(with-temp-buffer
(cd dir)
(dolist (new-or-modified
(split-string
(shell-command-to-string
"git ls-files -zmo --exclude-standard") "\0" t))
(if (and use-annex
(>= (file-attribute-size (file-attributes new-or-modified))
org-attach-git-annex-cutoff))
(call-process "git" nil nil nil "annex" "add" new-or-modified)
(call-process "git" nil nil nil "add" new-or-modified))
(cl-incf changes))
(dolist (deleted
(split-string
(shell-command-to-string "git ls-files -z --deleted") "\0" t))
(call-process "git" nil nil nil "rm" deleted)
(cl-incf changes))
(when (> changes 0)
(shell-command "git commit -m 'Synchronized attachments'"))))))
(add-hook 'org-attach-after-change-hook 'org-attach-git-commit)
(add-hook 'org-attach-open-hook 'org-attach-git-annex-get-maybe)
(provide 'org-attach-git)
;;; org-attach-git.el ends here
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