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;;; Guile-Git --- GNU Guile bindings of libgit2
;;; Copyright © 2025 Nicolas Graves <ngraves@ngraves.fr>
;;;
;;; 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 revwalker)
#:use-module (system foreign)
#:use-module (git bindings)
#:use-module (git oid)
#:use-module (git structs)
#:use-module (git types)
#:export (revwalk-hide!
revwalk-new
revwalk-next!
revwalk-push!
revwalk-push-range!
revwalk-reset!))
;;; Revision Walker https://libgit2.github.com/libgit2/#HEAD/group/revwalk
(define %revwalk-free (libgit2->pointer "git_revwalk_free"))
(define revwalk-new
(let ((proc (libgit2->procedure* "git_revwalk_new" `(* *))))
(lambda (repository)
"Create a new revision walker for REPOSITORY and return it."
(let ((out (make-double-pointer)))
(proc out (repository->pointer repository))
(set-pointer-finalizer! (dereference-pointer out) %revwalk-free)
(pointer->revwalk (dereference-pointer out))))))
(define revwalk-hide!
(let ((proc (libgit2->procedure int "git_revwalk_hide" `(* *))))
(lambda (walker oid)
"Hide OID from the revision WALKER."
(proc (revwalk->pointer walker) (oid->pointer oid)))))
(define revwalk-push!
(let ((proc (libgit2->procedure int "git_revwalk_push" `(* *))))
(lambda (walker oid)
"Push OID to the revision WALKER."
(proc (revwalk->pointer walker) (oid->pointer oid)))))
(define revwalk-push-range!
(let ((proc (libgit2->procedure int "git_revwalk_push_range" `(* *))))
(lambda (walker range)
"Push and hide the respective endpoints of the given RANGE."
(proc (revwalk->pointer walker) (string->pointer range)))))
(define revwalk-next!
(let ((proc (libgit2->procedure int "git_revwalk_next" `(* *))))
(lambda (walker)
"Retrieve the next OID in the revision WALKER. Returns #f if there are no more commits."
(let ((oid (make-oid-pointer)))
(if (zero? (proc oid (revwalk->pointer walker)))
(pointer->oid oid)
#f)))))
(define revwalk-reset!
(let ((proc (libgit2->procedure int "git_revwalk_reset" `(*))))
(lambda (walker)
"Reset the revision WALKER to the initial state."
(proc (revwalk->pointer walker)))))
;; FIXME: https://libgit2.github.com/libgit2/#HEAD/group/revwalk/git_revwalk_sorting
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