;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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 Guix 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 Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (test-git)
  #:use-module (git)
  #:use-module (guix git)
  #:use-module (guix tests git)
  #:use-module (guix build utils)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-64))

;; Test the (guix git) tools.

(test-begin "git")

;; 'with-temporary-git-repository' relies on the 'git' command.
(unless (which (git-command)) (test-skip 1))
(test-assert "commit-difference, linear history"
  (with-temporary-git-repository directory
      '((add "a.txt" "A")
        (commit "first commit")
        (add "b.txt" "B")
        (commit "second commit")
        (add "c.txt" "C")
        (commit "third commit")
        (add "d.txt" "D")
        (commit "fourth commit"))
    (with-repository directory repository
      (let ((commit1 (find-commit repository "first"))
            (commit2 (find-commit repository "second"))
            (commit3 (find-commit repository "third"))
            (commit4 (find-commit repository "fourth")))
        (and (lset= eq? (commit-difference commit4 commit1)
                    (list commit2 commit3 commit4))
             (lset= eq? (commit-difference commit4 commit2)
                    (list commit3 commit4))
             (equal? (commit-difference commit3 commit2)
                     (list commit3))

             ;; COMMIT4 is not an ancestor of COMMIT1 so we should get the
             ;; empty list.
             (null? (commit-difference commit1 commit4)))))))

(unless (which (git-command)) (test-skip 1))
(test-assert "commit-difference, fork"
  (with-temporary-git-repository directory
      '((add "a.txt" "A")
        (commit "first commit")
        (branch "devel")
        (checkout "devel")
        (add "devel/1.txt" "1")
        (commit "first devel commit")
        (add "devel/2.txt" "2")
        (commit "second devel commit")
        (checkout "master")
        (add "b.txt" "B")
        (commit "second commit")
        (add "c.txt" "C")
        (commit "third commit")
        (merge "devel" "merge")
        (add "d.txt" "D")
        (commit "fourth commit"))
    (with-repository directory repository
      (let ((master1 (find-commit repository "first commit"))
            (master2 (find-commit repository "second commit"))
            (master3 (find-commit repository "third commit"))
            (master4 (find-commit repository "fourth commit"))
            (devel1  (find-commit repository "first devel"))
            (devel2  (find-commit repository "second devel"))
            (merge   (find-commit repository "merge")))
        (and (equal? (commit-difference master4 merge)
                     (list master4))
             (lset= eq? (commit-difference master3 master1)
                    (list master3 master2))
             (lset= eq? (commit-difference devel2 master1)
                    (list devel2 devel1))

             ;; The merge occurred between MASTER2 and MASTER4 so here we
             ;; expect to see all the commits from the "devel" branch in
             ;; addition to those on "master".
             (lset= eq? (commit-difference master4 master2)
                    (list master4 merge master3 devel1 devel2)))))))

(test-end "git")