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;;; Guile-Git --- GNU Guile bindings of libgit2
;;; Copyright © 2025 45mg <45mg.writes@gmail.com>
;;; Copyright © 2025 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of Guile-Git.
;;;
;;; Guile-Git 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.
;;;
;;; Guile-Git 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 Guile-Git. If not, see <http://www.gnu.org/licenses/>.
(define-module (git graph)
#:use-module (git bindings)
#:use-module (git errors)
#:use-module (git oid)
#:use-module (git structs)
#:use-module (git types)
#:use-module (system foreign)
#:export (graph-ahead-behind
graph-descendant?))
(define graph-ahead-behind
(let ((proc (libgit2->procedure* "git_graph_ahead_behind" '(* * * * *))))
(lambda (repository local upstream)
"Return two values: the number of unique commits \"ahead\" in UPSTREAM,
and the number of unique commits \"behind\" in LOCAL, where UPSTREAM and
LOCAL are OIDs."
(let ((ahead (make-size_t-pointer))
(behind (make-size_t-pointer)))
(proc ahead behind
(repository->pointer repository)
(oid->pointer local)
(oid->pointer upstream))
(values (pointer->size_t ahead) (pointer->size_t behind))))))
(define graph-descendant?
(let ((proc (libgit2->procedure int "git_graph_descendant_of" '(* * *))))
(lambda (repository commit ancestor)
"Return whether COMMIT is a descendant of ANCESTOR (both OIDs) in
REPOSITORY. (Note that a commit is not considered a descendant of itself.)"
(let ((ret (proc (repository->pointer repository)
(oid->pointer commit)
(oid->pointer ancestor))))
(cond ((= ret 1) #t)
((= ret 0) #f)
(else (raise-git-error ret)))))))
;; TODO: git_graph_reachable_from_any
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