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;;; Guile-Git --- GNU Guile bindings of libgit2
;;; Copyright © 2016 Amirouche Boubekki <amirouche@hypermove.net>
;;; Copyright © 2016, 2017 Erik Edrosa <erik.edrosa@gmail.com>
;;; Copyright © 2019 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 blob)
#:use-module (system foreign)
#:use-module (git bindings)
#:use-module (git structs)
#:use-module (git types)
#:re-export (blob?)
#:export (blob-id
blob-size
blob-content
blob-lookup
blob-lookup-prefix))
;;; blob https://libgit2.github.com/libgit2/#HEAD/group/blob
(define blob-id
(let ((proc (libgit2->procedure '* "git_blob_id" '(*))))
(lambda (blob)
(pointer->oid (proc (blob->pointer blob))))))
(define %blob-free (libgit2->pointer "git_blob_free"))
(define (pointer->blob! pointer)
(set-pointer-finalizer! pointer %blob-free)
(pointer->blob pointer))
(define blob-lookup
(let ((proc (libgit2->procedure* "git_blob_lookup" `(* * *))))
(lambda (repository oid)
(let ((out (make-double-pointer)))
(proc out (repository->pointer repository) (oid->pointer oid))
(pointer->blob! (dereference-pointer out))))))
(define blob-lookup-prefix
(let ((proc (libgit2->procedure* "git_blob_lookup_prefix" `(* * * ,size_t))))
(lambda (repository id len)
(let ((out (make-double-pointer)))
(proc out (repository->pointer repository) (oid->pointer id) len)
(pointer->blob! (dereference-pointer out))))))
(define blob-size
(let ((proc (libgit2->procedure size_t "git_blob_rawsize" '(*))))
(lambda (blob)
"Return the size in bytes of the contents of BLOB."
(proc (blob->pointer blob)))))
(define %blob-contents
;; Map a bytevector (blob content) to the blob it belongs to.
(make-weak-value-hash-table))
(define blob-content
(let ((proc (libgit2->procedure '* "git_blob_rawcontent" '(*))))
(lambda (blob)
"Return the content of BLOB as a bytevector."
(let* ((ptr (proc (blob->pointer blob)))
(bv (pointer->bytevector ptr (blob-size blob))))
;; Since PTR belongs to BLOB, ensure BLOB is live as long as BV is.
(hashq-set! %blob-contents bv blob)
bv))))
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