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;; -*- coding: utf-8; -*-
;; gitto -- Keep track of your git repositories
;; Copyright (C) 2012 Tom Willemse <tom at ryuslash dot org>
;; This file is part of gitto.
;; gitto 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.
;; gitto 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 gitto. If not, see <http://www.gnu.org/licenses/>.
(define-module (gitto git)
#:use-module (ice-9 format)
#:use-module (ice-9 popen)
#:use-module (ice-9 rdelim)
#:use-module (oop goops)
#:use-module (srfi srfi-1)
#:export (<branch>
<repository>
branch-name
branch-pullable
branch-pushable
branch-updated
git-dir?
print
repo-branches
repo-clean?
repo-location
repo-name
repository?
repository-location<?
repository-location-exists?
repository-name<?
same-repository?))
(define show-unchanged-branches? #f)
(define-generic print)
(define-generic same-repository?)
(define-class <branch> ()
(name #:getter branch-name)
(pushable #:getter branch-pushable)
(pullable #:getter branch-pullable)
(updated #:getter branch-updated))
(define-class <repository> ()
(name #:getter repo-name)
(location #:getter repo-location)
(clean? #:getter repo-clean?)
(branches #:getter repo-branches))
(define (repository? repo)
(is-a? repo <repository>))
(define (repository-location<? repo1 repo2)
"Compary REPO1 and REPO2 to see if REPO1 should be considered less."
(string<? (repo-location repo1) (repo-location repo2)))
(define (repository-location-exists? repo)
"Check to see if REPO's location exists."
(file-exists? (repo-location repo)))
(define (repository-name<? repo1 repo2)
"Compare REPO1 and REPO2 to see if REPO1 should be considered less."
(string<? (repo-name repo1) (repo-name repo2)))
(define-method (branch-pullable (branch <branch>))
(force (slot-ref branch 'pullable)))
(define-method (branch-pushable (branch <branch>))
(force (slot-ref branch 'pushable)))
(define-method (branch-updated (branch <branch>))
(force (slot-ref branch 'updated)))
(define (git-branches dir)
"Call git-branch and parse its output."
(let ((pipe (start-git dir "branch")))
(map
(lambda (b) (string-trim-both b (char-set #\* #\space)))
(string-split (string-trim-right (read-string pipe)) #\newline))))
(define (git-clean? dir)
"Check whether a repository is clean.
Clean means there are no changes to the tracked files. Untracked files
will not register."
(let* ((pipe (start-git dir "status -suno"))
(clean? (eof-object? (read-delimited "" pipe))))
(close-pipe pipe)
clean?))
(define (git-dir? dir)
"Check whether or not DIR is a git repository.
DIR will be considered a git repository if it has a `.git'
sub-directory."
(let ((dir (string-append dir "/.git")))
(if (file-exists? dir)
(let ((dirstat (stat dir)))
(eq? (stat:type dirstat) 'directory))
#f)))
(define (git-last-update dir branch)
"Check when the last update in DIR of upstream for BRANCH was."
(let* ((pipe (start-git
dir (format #f "log -1 --format=%ar ~a@{u}" branch)))
(relative-last-update (read-line pipe)))
(close-pipe pipe)
(if (eof-object? relative-last-update)
"never"
relative-last-update)))
(define (git-revs-to-pull dir branch)
"Check how many commits should be pulled/merged from upstream."
(let* ((pipe (start-git
dir (format #f "log --pretty=oneline ~a..~:*~a@{u}" branch)
"| wc -l"))
(num (string->number (read-line pipe))))
(close-pipe pipe)
num))
(define (git-revs-to-push dir branch)
"Check how many commits should be pushed upstream."
(let* ((pipe (start-git
dir (format #f "log --pretty=oneline ~a@{u}..~:*~a" branch)
"| wc -l"))
(num (string->number (read-line pipe))))
(close-pipe pipe)
num))
(define-method (initialize (branch <branch>) args)
(let ((name (car args))
(dir (cadr args)))
(slot-set! branch 'name name)
(slot-set! branch 'pushable (delay (git-revs-to-push dir name)))
(slot-set! branch 'pullable (delay (git-revs-to-pull dir name)))
(slot-set! branch 'updated (delay (git-last-update dir name)))))
(define-method (initialize (repo <repository>) args)
(let ((dir (car args)))
(slot-set! repo 'name (basename dir))
(slot-set! repo 'location dir)
(slot-set! repo 'clean? (delay (git-clean? dir)))
(slot-set! repo 'branches
(delay (map (lambda (b) (make <branch> b dir))
(git-branches dir))))))
(define-method (print (branch <branch>))
(let ((pushable (branch-pushable branch))
(pullable (branch-pullable branch)))
(if (or show-unchanged-branches?
(> (+ pushable pullable) 0))
(format #t " ~a:~15t~d to push and ~d to pull. Last update: ~a~%"
(branch-name branch) pushable pullable
(branch-updated branch))
#f)))
(define (repo-state-description repo)
"Return the state of REPO as either clean or dirty.
REPO should be of type `<repository>' and the result is a string."
(if (repo-clean? repo) "clean" "dirty"))
(define-method (print (repo <repository>))
(if (file-exists? (repo-location repo))
(begin
(format #t "~a: Worktree is ~a~%" (repo-name repo)
(repo-state-description repo))
(when (any identity (map-in-order print (repo-branches repo)))
(newline))
#t)
(format #t "~a:~15tnot found at ~s\n"
(repo-name repo) (repo-location repo))))
(define-method (repo-branches (repo <repository>))
(force (slot-ref repo 'branches)))
(define-method (repo-clean? (repo <repository>))
(force (slot-ref repo 'clean?)))
(define-method (same-repository? (x <repository>) (y <repository>))
(string= (repo-location x) (repo-location y)))
(define-method (same-repository? (x <repository>) (y <string>))
(string= (repo-location x) y))
(define-method (same-repository? (x <string>) (y <repository>))
(string= x (repo-location y)))
(define-method (same-repository? x y)
#f)
(define* (start-git dir args #:optional (extra ""))
(open-input-pipe
(format #f "git --work-tree=~s --git-dir=\"~a/.git\" ~a 2>/dev/null ~a"
dir dir args extra)))
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