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;; Tekuti
;; Copyright (C) 2008 Andy Wingo <wingo at pobox dot com>
;; 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 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 this program; if not, contact:
;;
;; Free Software Foundation Voice: +1-617-542-5942
;; 59 Temple Place - Suite 330 Fax: +1-617-542-2652
;; Boston, MA 02111-1307, USA gnu@gnu.org
;;; Commentary:
;;
;; This is the main script that will launch tekuti.
;;
;;; Code:
(define-module (tekuti git)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 popen)
#:use-module (tekuti util)
#:use-module (tekuti config)
#:use-module (scheme kwargs)
#:use-module (match-bind)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:export (&git-condition git-condition? git-condition-argv
git-condition-output git-condition-status false-if-git-error
git git* ensure-git-repo git-ls-tree git-ls-subdirs
parse-metadata parse-commit commit-utc-timestamp
commit-parents make-tree git-rev-parse make-tree-full
create-blob git-update-ref
write-indices read-indices))
(define-condition-type &git-condition &condition git-condition?
(argv git-condition-argv)
(output git-condition-output)
(status git-condition-status))
(define-macro (false-if-git-error . body)
`(,guard (c ((,git-condition? c) #f))
,@body))
(define (shell:quote str)
(with-output-to-string
(lambda ()
(display #\')
(for-each (lambda (ch)
(if (eqv? ch #\')
(begin (display #\\) (display #\'))
(display ch)))
(string->list str))
(display #\'))))
(define *debug* #f)
(define (trc . args)
(if *debug*
(apply pk args)
(car (last-pair args))))
(define (run-git env input-file args)
(define (prepend-env args)
(if (null? env)
args
(cons "/usr/bin/env" (append env args))))
(define (prepend-git args)
(cons* *git* "--bare" args))
(define (redirect-input args)
(if input-file
(list "/bin/sh" "-c"
(string-append (string-join (map shell:quote args) " ")
"<" input-file))
args))
(let* ((real-args (trc (redirect-input (prepend-env (prepend-git args)))))
(pipe (apply open-pipe* OPEN_READ real-args))
(output (read-delimited "" pipe))
(ret (close-pipe pipe)))
(case (status:exit-val ret)
((0) (if (eof-object? output) "" output))
(else (trc 'git-error output ret real-args)
(raise (condition (&git-condition
(argv real-args)
(output output)
(status ret))))))))
(define (call-with-temp-file contents proc)
(let* ((template (string-copy "/tmp/tekutiXXXXXX"))
(tmp (mkstemp! template)))
(display contents tmp)
(close tmp)
(unwind-protect
(proc template)
(delete-file template))))
(define/kwargs (git* args (input #f) (env '()))
;; foolishness regarding env
(if input
(call-with-temp-file
input
(lambda (tempname)
(trc input)
(run-git env tempname args)))
(run-git env #f args)))
(define (git . args)
(git* args))
(define (is-dir? path)
(catch 'system-error
(lambda () (eq? (stat:type (stat path)) 'directory))
(lambda args #f)))
(define (ensure-git-repo)
(let ((d (expanduser *git-dir*)))
(if (not (is-dir? d))
(begin
(mkdir d)
(chdir d)
(git "init"))
(chdir d))))
(define (git-ls-tree treeish path)
(or (false-if-git-error
(match-lines (git "ls-tree" treeish (or path "."))
"^(.+) (.+) (.+)\t(.+)$" (_ mode type object name)
;; reversed for assoc
(list name object type mode)))
'()))
(define (git-ls-subdirs treeish path)
(or (false-if-git-error
(match-lines (git "ls-tree" treeish (or path "."))
"^(.+) tree (.+)\t(.+)$" (_ mode object name)
(cons name object)))
'()))
(define (parse-metadata treeish specs)
(filter
identity
(match-lines (git "show" treeish)
"^([^: ]+): +(.*)$" (_ k v)
(let* ((k (string->symbol k))
(parse (assq-ref specs k)))
(if parse
(catch 'parse-error
(lambda ()
(cons k (parse v)))
(lambda args #f))
(cons k v))))))
(define (parse-commit commit)
(let ((text (git "cat-file" "commit" commit)))
(match-bind
"\n\n(.*)$" text (_ message)
(acons
'message message
(match-lines (substring text 0 (- (string-length text) (string-length _)))
"^([^ ]+) (.*)$" (_ k v)
(cons (string->symbol k) v))))))
(define (commit-utc-timestamp commit)
(match-bind
"^(.*) ([0-9]+) ([+-][0-9]+)" (assq-ref (parse-commit commit) 'committer)
(_ who ts tz)
(let ((ts (string->number ts)) (tz (string->number tz)))
(- ts (* (+ (* (quotient tz 100) 60) (remainder tz 100)) 60)))))
;; fixme: do to commits what i already did to posts
(define (commit-parents commit)
(map cdr
(filter
(lambda (x) (eq? (car x) 'parent))
(parse-commit commit))))
(define (make-tree alist)
(string-trim-both
(git* '("mktree")
#:input (string-join
(map (lambda (pair)
(let ((name (car pair)) (sha (cdr pair)))
(format #f "040000 tree ~a\t~a" sha name)))
alist)
"\n" 'suffix))))
(define (git-rev-parse rev)
(string-trim-both (git "rev-parse" rev)))
(define (create-blob contents)
(string-trim-both
(git* '("hash-object" "-w" "--stdin") #:input contents)))
;; order: name object type mode
(define (make-tree-full alist)
(string-trim-both
(git* '("mktree")
#:input (string-join
(map (lambda (l)
(apply format #f "~a ~a ~a\t~a"
(reverse l)))
alist)
"\n" 'suffix))))
(define (git-update-ref refname proc count)
(let* ((ref (git-rev-parse refname))
(commit (proc ref)))
(cond
((zero? count)
(error "my god, we looped 5 times" commit))
((false-if-git-error
(git "update-ref" refname commit ref))
commit)
(else
(pk "failed to update the ref, trying again..." refname)
(git-update-ref (git-rev-parse refname) (1- count))))))
;; fixme: map-pairs
(define (assoc-list-ref alist key n default)
(let ((l (assoc key alist)))
(if l (list-ref l n) default)))
(define (write-indices indices oldref specs)
(let* ((master (assq-ref indices 'master))
(ts (commit-utc-timestamp master))
(env (list "GIT_COMMMITTER=tekuti"
(format #f "GIT_COMMITTER_DATE=~a +0100" ts)
(format #f "GIT_AUTHOR_DATE=~a +0100" ts)))
(tree (make-tree-full
(map (lambda (pair)
(list (symbol->string (car pair))
(create-blob
(with-output-to-string
(lambda ()
((assoc-list-ref specs (car pair) 2 write)
(cdr pair)))))
"blob" "100644"))
indices))))
(let ((new (string-trim-both
(git* (cons* "commit-tree" tree
(if oldref (list "-p" oldref) '()))
#:input "reindex\n" #:env env))))
(or (false-if-git-error
(git "update-ref" "refs/heads/index" new (or oldref "")))
(warn "could not update indexes ref"))
new)))
(define (read-indices specs)
(and=> (false-if-git-error (git-rev-parse "refs/heads/index"))
(lambda (ref)
(cons ref
(map (lambda (dent)
(cons (string->symbol (car dent))
(with-input-from-string
(git "show" (cadr dent))
(assoc-list-ref specs (string->symbol (car dent)) 3 read))))
(git-ls-tree (assq-ref (parse-commit ref) 'tree)
#f))))))
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