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git: Add 'commit-relation'. 

* guix/git.scm (commit-relation): New procedure.
* tests/git.scm ("commit-relation"): New test.
This commit is contained in:
Ludovic Courtès 2020-05-20 13:01:26 +02:00
parent 86ac14b2f3
commit c098c11be8
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2 changed files with 57 additions and 1 deletions
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16
guix/git.scm
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@ -43,6 +43,7 @@
url+commit->name
latest-repository-commit
commit-difference
commit-relation
git-checkout
git-checkout?
@ -405,6 +406,21 @@ that of OLD."
(cons head result)
(set-insert head visited)))))))
(define (commit-relation old new)
"Return a symbol denoting the relation between OLD and NEW, two commit
objects: 'ancestor (meaning that OLD is an ancestor of NEW), 'descendant, or
'unrelated, or 'self (OLD and NEW are the same commit)."
(if (eq? old new)
'self
(let ((newest (commit-closure new)))
(if (set-contains? newest old)
'ancestor
(let* ((seen (list->setq (commit-parents new)))
(oldest (commit-closure old seen)))
(if (set-contains? oldest new)
'descendant
'unrelated))))))
;;;
;;; Checkouts.

42
tests/git.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -122,4 +122,44 @@
(lset= eq? (commit-difference commit4 commit1 (list commit5))
(list commit2 commit3 commit4)))))))
(unless (which (git-command)) (test-skip 1))
(test-equal "commit-relation"
'(self ;master3 master3
ancestor ;master1 master3
descendant ;master3 master1
unrelated ;master2 branch1
unrelated ;branch1 master2
ancestor ;branch1 merge
descendant ;merge branch1
ancestor ;master1 merge
descendant) ;merge master1
(with-temporary-git-repository directory
'((add "a.txt" "A")
(commit "first commit")
(branch "hack")
(checkout "hack")
(add "1.txt" "1")
(commit "branch commit")
(checkout "master")
(add "b.txt" "B")
(commit "second commit")
(add "c.txt" "C")
(commit "third commit")
(merge "hack" "merge"))
(with-repository directory repository
(let ((master1 (find-commit repository "first"))
(master2 (find-commit repository "second"))
(master3 (find-commit repository "third"))
(branch1 (find-commit repository "branch"))
(merge (find-commit repository "merge")))
(list (commit-relation master3 master3)
(commit-relation master1 master3)
(commit-relation master3 master1)
(commit-relation master2 branch1)
(commit-relation branch1 master2)
(commit-relation branch1 merge)
(commit-relation merge branch1)
(commit-relation master1 merge)
(commit-relation merge master1))))))
(test-end "git")