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emacs/lisp/vc/vc-arch.el

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;;; vc-arch.el --- VC backend for the Arch version-control system -*- lexical-binding: t -*-
;; Copyright (C) 2004-2014 Free Software Foundation, Inc.
;; Author: FSF (see vc.el for full credits)
;; Maintainer: Stefan Monnier <monnier@gnu.org>
;; Package: vc
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;; The home page of the Arch version control system is at
;;
;; http://www.gnuarch.org/
;;
;; 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"
:group 'vc-arch)
(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
:group 'vc-arch)
;; 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
(+ (nth 2 (current-time))
(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 rev _comment)
(if rev (error "Explicit initial revision not supported for Arch"))
(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-workfile-unchanged-p (_file)
"Stub: arch workfiles are always considered to be in a changed state,"
nil)
(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 (nth 7 ats) (string-to-number (match-string 2)))
(equal (format-time-string "%s" (nth 5 ats))
(match-string 1)))
'up-to-date
'edited)))))))))
;; -dir-status called from vc-dir, which loads vc, which loads vc-dispatcher.
(declare-function vc-exec-after "vc-dispatcher" (code))
(defun vc-arch-dir-status (dir 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))
:group 'vc-arch)
(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 ?@)
(t ?:))
rev)))
(defun vc-arch-diff3-rej-p (rej)
(let ((attrs (file-attributes rej)))
(and attrs (< (nth 7 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 rev comment)
(if rev (error "Committing to a specific revision is unsupported"))
;; 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)
"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
(async (not vc-disable-async-diff))
;; 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))
(defun vc-arch-init-revision () nil)
;;; 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 "[^.]\\|..."))
(categories
(apply 'append
(mapcar (lambda (dir)
(when (file-directory-p dir)
(directory-files dir 'full "[^.]\\|...")))
archives)))
(branches
(apply 'append
(mapcar (lambda (dir)
(when (file-directory-p dir)
(directory-files dir 'full "[^.]\\|...")))
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
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