;;; vc-arch.el --- VC backend for the Arch version-control system -*- lexical-binding: t -*- ;; Copyright (C) 2004-2021 Free Software Foundation, Inc. ;; Author: FSF (see vc.el for full credits) ;; Maintainer: Stefan Monnier ;; Package: vc ;; Obsolete-since: 25.1 ;; 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 . ;;; Commentary: ;; The home page of the Arch version control system is at ;; ;; https://www.gnu.org/software/gnu-arch/ ;; ;; This is derived from vc-mcvs.el as follows: ;; - cp vc-mcvs.el vc-arch.el and then M-% mcvs RET arch RET ;; ;; Then of course started the hacking. ;; ;; What has been partly tested: ;; - Open a file. ;; - C-x v = without any prefix arg. ;; - C-x v v to commit a change to a single file. ;; Bugs: ;; - *vc-log*'s initial content lacks the `Summary:' lines. ;; - All files under the tree are considered as "under Arch's control" ;; without regards to =tagging-method and such. ;; - Files are always considered as `edited'. ;; - C-x v l does not work. ;; - C-x v i does not work. ;; - C-x v ~ does not work. ;; - C-x v u does not work. ;; - C-x v s does not work. ;; - C-x v r does not work. ;; - VC directory listings do not work. ;; - And more... ;;; Code: (eval-when-compile (require 'vc)) ;;; Properties of the backend (defun vc-arch-revision-granularity () 'repository) (defun vc-arch-checkout-model (_files) 'implicit) ;;; ;;; Customization options ;;; (defgroup vc-arch nil "VC Arch backend." :version "24.1" :group 'vc) ;; It seems Arch diff does not accept many options, so this is not ;; very useful. It exists mainly so that the VC backends are all ;; consistent with regards to their treatment of diff switches. (defcustom vc-arch-diff-switches t "String or list of strings specifying switches for Arch diff under VC. If nil, use the value of `vc-diff-switches'. If t, use no switches." :type '(choice (const :tag "Unspecified" nil) (const :tag "None" t) (string :tag "Argument String") (repeat :tag "Argument List" :value ("") string)) :version "23.1") (define-obsolete-variable-alias 'vc-arch-command 'vc-arch-program "23.1") (defcustom vc-arch-program (let ((candidates '("tla" "baz"))) (while (and candidates (not (executable-find (car candidates)))) (setq candidates (cdr candidates))) (or (car candidates) "tla")) "Name of the Arch executable." :type 'string) ;; Clear up the cache to force vc-call to check again and discover ;; new functions when we reload this file. (put 'Arch 'vc-functions nil) ;;;###autoload (defun vc-arch-registered (file) ;;;###autoload (if (vc-find-root file "{arch}/=tagging-method") ;;;###autoload (progn ;;;###autoload (load "vc-arch" nil t) ;;;###autoload (vc-arch-registered file)))) (defun vc-arch-add-tagline () "Add an `arch-tag' to the end of the current file." (interactive) (comment-normalize-vars) (goto-char (point-max)) (forward-comment -1) (skip-chars-forward " \t\n") (cond ((not (bolp)) (insert "\n\n")) ((not (eq ?\n (char-before (1- (point))))) (insert "\n"))) (let ((beg (point)) (idfile (and buffer-file-name (expand-file-name (concat ".arch-ids/" (file-name-nondirectory buffer-file-name) ".id") (file-name-directory buffer-file-name))))) (insert "arch-tag: ") (if (and idfile (file-exists-p idfile)) ;; If the file is unreadable, we do want to get an error here. (progn (insert-file-contents idfile) (forward-line 1) (delete-file idfile)) (condition-case nil (call-process "uuidgen" nil t) (file-error (insert (format "%s <%s> %s" (current-time-string) user-mail-address (+ (% (car (time-convert nil 1000000)) 1000000) (buffer-size))))))) (comment-region beg (point)))) (defconst vc-arch-tagline-re "^\\W*arch-tag:[ \t]*\\(.*[^ \t\n]\\)") (defmacro vc-with-current-file-buffer (file &rest body) (declare (indent 2) (debug t)) `(let ((-kill-buf- nil) (-file- ,file)) (with-current-buffer (or (find-buffer-visiting -file-) (setq -kill-buf- (generate-new-buffer " temp"))) ;; Avoid find-file-literally since it can do many undesirable extra ;; things (among which, call us back into an infinite loop). (if -kill-buf- (insert-file-contents -file-)) (unwind-protect (progn ,@body) (if (buffer-live-p -kill-buf-) (kill-buffer -kill-buf-)))))) (defun vc-arch-file-source-p (file) "Can return nil, `maybe' or a non-nil value. Only the value `maybe' can be trusted :-(." ;; FIXME: Check the tag and name of parent dirs. (unless (string-match "\\`[,+]" (file-name-nondirectory file)) (or (string-match "\\`{arch}/" (file-relative-name file (vc-arch-root file))) (file-exists-p ;; Check the presence of an ID file. (expand-file-name (concat ".arch-ids/" (file-name-nondirectory file) ".id") (file-name-directory file))) ;; Check the presence of a tagline. (vc-with-current-file-buffer file (save-excursion (goto-char (point-max)) (or (re-search-backward vc-arch-tagline-re (- (point) 1000) t) (progn (goto-char (point-min)) (re-search-forward vc-arch-tagline-re (+ (point) 1000) t))))) ;; FIXME: check =tagging-method to see whether untagged files might ;; be source or not. (with-current-buffer (find-file-noselect (expand-file-name "{arch}/=tagging-method" (vc-arch-root file))) (let ((untagged-source t)) ;Default is `names'. (save-excursion (goto-char (point-min)) (if (re-search-forward "^[ \t]*\\(\\(tagline\\|implicit\\|names\\)\\|explicit\\)" nil t) (setq untagged-source (match-end 2))) (if (re-search-forward "^[ \t]*untagged-source[ \t]+\\(\\(source\\)\\|precious\\|backup\\|junk\\|unrecognized\\)" nil t) (setq untagged-source (match-end 2)))) (if untagged-source 'maybe)))))) (defun vc-arch-file-id (file) ;; Don't include the kind of ID this is because it seems to be too messy. (let ((idfile (expand-file-name (concat ".arch-ids/" (file-name-nondirectory file) ".id") (file-name-directory file)))) (if (file-exists-p idfile) (with-temp-buffer (insert-file-contents idfile) (looking-at ".*[^ \n\t]") (match-string 0)) (with-current-buffer (find-file-noselect file) (save-excursion (goto-char (point-max)) (if (or (re-search-backward vc-arch-tagline-re (- (point) 1000) t) (progn (goto-char (point-min)) (re-search-forward vc-arch-tagline-re (+ (point) 1000) t))) (match-string 1) (concat "./" (file-relative-name file (vc-arch-root file))))))))) (defun vc-arch-tagging-method (file) (with-current-buffer (find-file-noselect (expand-file-name "{arch}/=tagging-method" (vc-arch-root file))) (save-excursion (goto-char (point-min)) (if (re-search-forward "^[ \t]*\\(tagline\\|implicit\\|names\\|explicit\\)" nil t) (intern (match-string 1)) 'names)))) (defun vc-arch-root (file) "Return the root directory of an Arch project, if any." (or (vc-file-getprop file 'arch-root) ;; Check the =tagging-method, in case someone naively manually ;; creates a {arch} directory somewhere. (let ((root (vc-find-root file "{arch}/=tagging-method"))) (when root (vc-file-setprop file 'arch-root root))))) (defun vc-arch-find-admin-dir (file) "Return the administrative directory of FILE." (expand-file-name "{arch}" (vc-arch-root file))) (defun vc-arch-register (files &optional _comment) (dolist (file files) (let ((tagmet (vc-arch-tagging-method file))) (if (and (memq tagmet '(tagline implicit)) comment-start) (with-current-buffer (find-file-noselect file) (if (buffer-modified-p) (error "Save %s first" (buffer-name))) (vc-arch-add-tagline) (save-buffer))))) (vc-arch-command nil 0 files "add")) (defun vc-arch-registered (file) ;; Don't seriously check whether it's source or not. Checking would ;; require running TLA, so it's better to not do it, so it also works if ;; TLA is not installed. (and (vc-arch-root file) (vc-arch-file-source-p file))) (defun vc-arch-default-version (file) (or (vc-file-getprop (vc-arch-root file) 'arch-default-version) (let* ((root (vc-arch-root file)) (f (expand-file-name "{arch}/++default-version" root))) (if (file-readable-p f) (vc-file-setprop root 'arch-default-version (with-temp-buffer (insert-file-contents f) ;; Strip the terminating newline. (buffer-substring (point-min) (1- (point-max))))))))) (defun vc-arch-state (file) ;; There's no checkout operation and merging is not done from VC ;; so the only operation that's state dependent that VC supports is commit ;; which is only activated if the file is `edited'. (let* ((root (vc-arch-root file)) (ver (vc-arch-default-version file)) (pat (concat "\\`" (subst-char-in-string ?/ ?% ver))) (dir (expand-file-name ",,inode-sigs/" (expand-file-name "{arch}" root))) (sigfile nil)) (dolist (f (if (file-directory-p dir) (directory-files dir t pat))) (if (or (not sigfile) (file-newer-than-file-p f sigfile)) (setq sigfile f))) (if (not sigfile) 'edited ;We know nothing. (let ((id (vc-arch-file-id file))) (setq id (replace-regexp-in-string "[ \t]" "_" id)) (with-current-buffer (find-file-noselect sigfile) (goto-char (point-min)) (while (and (search-forward id nil 'move) (save-excursion (goto-char (- (match-beginning 0) 2)) ;; For `names', the lines start with `?./foo/bar'. ;; For others there's 2 chars before the ./foo/bar. (or (not (or (bolp) (looking-at "\n?"))) ;; Ignore E_ entries used for foo.id files. (looking-at "E_"))))) (if (eobp) ;; ID not found. (if (equal (file-name-nondirectory sigfile) (subst-char-in-string ?/ ?% (vc-arch-working-revision file))) 'added ;; Might be `added' or `up-to-date' as well. ;; FIXME: Check in the patch logs to find out. 'edited) ;; Found the ID, let's check the inode. (if (not (re-search-forward "\t.*mtime=\\([0-9]+\\):size=\\([0-9]+\\)" (line-end-position) t)) ;; Buh? Unexpected format. 'edited (let ((ats (file-attributes file))) (if (and (eq (file-attribute-size ats) (string-to-number (match-string 2))) (equal (format-time-string "%s" (file-attribute-modification-time ats)) (match-string 1))) 'up-to-date 'edited))))))))) ;; dir-status-files called from vc-dir, which loads vc, ;; which loads vc-dispatcher. (declare-function vc-exec-after "vc-dispatcher" (code)) (defun vc-arch-dir-status-files (dir _files callback) "Run `tla inventory' for DIR and pass results to CALLBACK. CALLBACK expects (ENTRIES &optional MORE-TO-COME); see `vc-dir-refresh'." (let ((default-directory dir)) (vc-arch-command t 'async nil "changes")) ;; The updating could be done asynchronously. (vc-run-delayed (vc-arch-after-dir-status callback))) (defun vc-arch-after-dir-status (callback) (let* ((state-map '(("M " . edited) ("Mb" . edited) ;binary ("D " . removed) ("D/" . removed) ;directory ("A " . added) ("A/" . added) ;directory ("=>" . renamed) ("/>" . renamed) ;directory ("lf" . symlink-to-file) ("fl" . file-to-symlink) ("--" . permissions-changed) ("-/" . permissions-changed) ;directory )) (state-map-regexp (regexp-opt (mapcar #'car state-map) t)) (entry-regexp (concat "^" state-map-regexp " \\(.*\\)$")) result) (goto-char (point-min)) ;;(message "Got %s" (buffer-string)) (while (re-search-forward entry-regexp nil t) (let* ((state-string (match-string 1)) (state (cdr (assoc state-string state-map))) (filename (match-string 2))) (push (list filename state) result))) (funcall callback result nil))) (defun vc-arch-working-revision (file) (let* ((root (expand-file-name "{arch}" (vc-arch-root file))) (defbranch (vc-arch-default-version file))) (when (and defbranch (string-match "\\`\\(.+@[^/\n]+\\)/\\(\\(\\(.*?\\)\\(?:--.*\\)?\\)--.*\\)\\'" defbranch)) (let* ((archive (match-string 1 defbranch)) (category (match-string 4 defbranch)) (branch (match-string 3 defbranch)) (version (match-string 2 defbranch)) (sealed nil) (rev-nb 0) (rev nil) logdir tmp) (setq logdir (expand-file-name category root)) (setq logdir (expand-file-name branch logdir)) (setq logdir (expand-file-name version logdir)) (setq logdir (expand-file-name archive logdir)) (setq logdir (expand-file-name "patch-log" logdir)) (dolist (file (if (file-directory-p logdir) (directory-files logdir))) ;; Revision names go: base-0, patch-N, version-0, versionfix-M. (when (and (eq (aref file 0) ?v) (not sealed)) (setq sealed t rev-nb 0)) (if (and (string-match "-\\([0-9]+\\)\\'" file) (setq tmp (string-to-number (match-string 1 file))) (or (not sealed) (eq (aref file 0) ?v)) (>= tmp rev-nb)) (setq rev-nb tmp rev file))) ;; Use "none-000" if the tree hasn't yet been committed on the ;; default branch. We'll then get "Arch:000[branch]" on the mode-line. (concat defbranch "--" (or rev "none-000")))))) (defcustom vc-arch-mode-line-rewrite '(("\\`.*--\\(.*--.*\\)--\\(v?\\).*-\\([0-9]+\\)\\'" . "\\2\\3[\\1]")) "Rewrite rules to shorten Arch's revision names on the mode-line." :type '(repeat (cons regexp string))) (defun vc-arch-mode-line-string (file) "Return a string for `vc-mode-line' to put in the mode line for FILE." (let ((rev (vc-working-revision file))) (dolist (rule vc-arch-mode-line-rewrite) (if (string-match (car rule) rev) (setq rev (replace-match (cdr rule) t nil rev)))) (format "Arch%c%s" (pcase (vc-state file) ((or 'up-to-date 'needs-update) ?-) ('added ?@) (_ ?:)) rev))) (defun vc-arch-diff3-rej-p (rej) (let ((attrs (file-attributes rej))) (and attrs (< (file-attribute-size attrs) 60) (with-temp-buffer (insert-file-contents rej) (goto-char (point-min)) (looking-at "Conflicts occurred, diff3 conflict markers left in file\\."))))) (defun vc-arch-delete-rej-if-obsolete () "For use in `after-save-hook'." (save-excursion (let ((rej (concat buffer-file-name ".rej"))) (when (and buffer-file-name (vc-arch-diff3-rej-p rej)) (unless (re-search-forward "^<<<<<<< " nil t) ;; The .rej file is obsolete. (condition-case nil (delete-file rej) (error nil)) ;; Remove the hook so that it is not called multiple times. (remove-hook 'after-save-hook #'vc-arch-delete-rej-if-obsolete t)))))) (defun vc-arch-find-file-hook () (let ((rej (concat buffer-file-name ".rej"))) (when (and buffer-file-name (file-exists-p rej)) (if (vc-arch-diff3-rej-p rej) (save-excursion (goto-char (point-min)) (if (not (re-search-forward "^<<<<<<< " nil t)) ;; The .rej file is obsolete. (condition-case nil (delete-file rej) (error nil)) (smerge-mode 1) (add-hook 'after-save-hook #'vc-arch-delete-rej-if-obsolete nil t) (message "There are unresolved conflicts in this file"))) (message "There are unresolved conflicts in %s" (file-name-nondirectory rej)))))) (autoload 'vc-switches "vc") (defun vc-arch-checkin (files comment) ;; FIXME: This implementation probably only works for singleton filesets (let ((summary (file-relative-name (car files) (vc-arch-root (car files))))) ;; Extract a summary from the comment. (when (or (string-match "\\`Summary:[ \t]*\\(.*[^ \t\n]\\)\\([ \t]*\n\\)*" comment) (string-match "\\`[ \t]*\\(.*[^ \t\n]\\)[ \t]*\\(\n?\\'\\|\n\\([ \t]*\n\\)+\\)" comment)) (setq summary (match-string 1 comment)) (setq comment (substring comment (match-end 0)))) (vc-arch-command nil 0 files "commit" "-s" summary "-L" comment "--" (vc-switches 'Arch 'checkin)))) (defun vc-arch-diff (files &optional oldvers newvers buffer async) "Get a difference report using Arch between two versions of FILES." ;; FIXME: This implementation only works for singleton filesets. To make ;; it work for more cases, we have to either call `file-diffs' manually on ;; each and every `file' in the fileset, or use `changes --diffs' (and ;; variants) and maybe filter the output with `filterdiff' to only include ;; the files in which we're interested. (let ((file (car files))) (if (and newvers (vc-up-to-date-p file) (equal newvers (vc-working-revision file))) ;; Newvers is the base revision and the current file is unchanged, ;; so we can diff with the current file. (setq newvers nil)) (if newvers (error "Diffing specific revisions not implemented") (let* (process-file-side-effects ;; Run the command from the root dir. (default-directory (vc-arch-root file)) (status (vc-arch-command (or buffer "*vc-diff*") (if async 'async 1) nil "file-diffs" (vc-switches 'Arch 'diff) (file-relative-name file) (if (equal oldvers (vc-working-revision file)) nil oldvers)))) (if async 1 status))))) ; async diff, pessimistic assumption. (defun vc-arch-delete-file (file) (vc-arch-command nil 0 file "rm")) (defun vc-arch-rename-file (old new) (vc-arch-command nil 0 new "mv" (file-relative-name old))) (defalias 'vc-arch-responsible-p #'vc-arch-root) (defun vc-arch-command (buffer okstatus file &rest flags) "A wrapper around `vc-do-command' for use in vc-arch.el." (apply #'vc-do-command (or buffer "*vc*") okstatus vc-arch-program file flags)) ;;; Completion of versions and revisions. (defun vc-arch--version-completion-table (root string) (delq nil (mapcar (lambda (d) (when (string-match "/\\([^/]+\\)/\\([^/]+\\)\\'" d) (concat (match-string 2 d) "/" (match-string 1 d)))) (let ((default-directory root)) (file-expand-wildcards (concat "*/*/" (if (string-match "/" string) (concat (substring string (match-end 0)) "*/" (substring string 0 (match-beginning 0))) (concat "*/" string)) "*")))))) (defun vc-arch-revision-completion-table (files) (lambda (string pred action) ;; FIXME: complete revision patches as well. (let* ((root (expand-file-name "{arch}" (vc-arch-root (car files)))) (table (vc-arch--version-completion-table root string))) (complete-with-action action table string pred)))) ;;; Trimming revision libraries. ;; This code is not directly related to VC and there are many variants of ;; this functionality available as scripts, but I like this version better, ;; so maybe others will like it too. (defun vc-arch-trim-find-least-useful-rev (revs) (let* ((first (pop revs)) (second (pop revs)) (third (pop revs)) ;; We try to give more importance to recent revisions. The idea is ;; that it's OK if checking out a revision 1000-patch-old is ten ;; times slower than checking out a revision 100-patch-old. But at ;; the same time a 2-patch-old rev isn't really ten times more ;; important than a 20-patch-old, so we use an arbitrary constant ;; "100" to reduce this effect for recent revisions. Making this ;; constant a float has the side effect of causing the subsequent ;; computations to be done as floats as well. (max (+ 100.0 (car (or (car (last revs)) third)))) (cost (lambda () (/ (- (car third) (car first)) (- max (car second))))) (minrev second) (mincost (funcall cost))) (while revs (setq first second) (setq second third) (setq third (pop revs)) (when (< (funcall cost) mincost) (setq minrev second) (setq mincost (funcall cost)))) minrev)) (defun vc-arch-trim-make-sentinel (revs) (if (null revs) (lambda (_proc _msg) (message "VC-Arch trimming ... done")) (lambda (_proc _msg) (message "VC-Arch trimming %s..." (file-name-nondirectory (car revs))) (rename-file (car revs) (concat (car revs) "*rm*")) (let ((proc (start-process "vc-arch-trim" nil "rm" "-rf" (concat (car revs) "*rm*")))) (set-process-sentinel proc (vc-arch-trim-make-sentinel (cdr revs))))))) (defun vc-arch-trim-one-revlib (dir) "Delete half of the revisions in the revision library." (interactive "Ddirectory: ") (let ((garbage (directory-files dir 'full "\\`,," 'nosort))) (when garbage (funcall (vc-arch-trim-make-sentinel garbage) nil nil))) (let ((revs (sort (delq nil (mapcar (lambda (f) (when (string-match "-\\([0-9]+\\)\\'" f) (cons (string-to-number (match-string 1 f)) f))) (directory-files dir nil nil 'nosort))) #'car-less-than-car)) (subdirs nil)) (when (cddr revs) (dotimes (_i (/ (length revs) 2)) (let ((minrev (vc-arch-trim-find-least-useful-rev revs))) (setq revs (delq minrev revs)) (push minrev subdirs))) (funcall (vc-arch-trim-make-sentinel (mapcar (lambda (x) (expand-file-name (cdr x) dir)) subdirs)) nil nil)))) (defun vc-arch-trim-revlib () "Delete half of the revisions in the revision library." (interactive) (let ((rl-dir (with-output-to-string (call-process vc-arch-program nil standard-output nil "my-revision-library")))) (while (string-match "\\(.*\\)\n" rl-dir) (let ((dir (match-string 1 rl-dir))) (setq rl-dir (if (and (file-directory-p dir) (file-writable-p dir)) dir (substring rl-dir (match-end 0)))))) (unless (file-writable-p rl-dir) (error "No writable revlib directory found")) (message "Revlib at %s" rl-dir) (let* ((archives (directory-files rl-dir 'full directory-files-no-dot-files-regexp)) (categories (apply #'append (mapcar (lambda (dir) (when (file-directory-p dir) (directory-files dir 'full directory-files-no-dot-files-regexp))) archives))) (branches (apply #'append (mapcar (lambda (dir) (when (file-directory-p dir) (directory-files dir 'full directory-files-no-dot-files-regexp))) categories))) (versions (apply #'append (mapcar (lambda (dir) (when (file-directory-p dir) (directory-files dir 'full "--.*--"))) branches)))) (mapc #'vc-arch-trim-one-revlib versions)) )) (defvar vc-arch-extra-menu-map (let ((map (make-sparse-keymap))) (define-key map [add-tagline] '(menu-item "Add tagline" vc-arch-add-tagline)) map)) (defun vc-arch-extra-menu () vc-arch-extra-menu-map) ;;; Less obvious implementations. (defun vc-arch-find-revision (file rev buffer) (let ((out (make-temp-file "vc-out"))) (unwind-protect (progn (with-temp-buffer (vc-arch-command (current-buffer) 1 nil "file-diffs" file rev) (call-process-region (point-min) (point-max) "patch" nil nil nil "-R" "-o" out file)) (with-current-buffer buffer (insert-file-contents out))) (delete-file out)))) (provide 'vc-arch) ;;; vc-arch.el ends here