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;;; tissue --- Text based issue tracker
;;; Copyright © 2022 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of tissue.
;;;
;;; tissue 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.
;;;
;;; tissue 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 tissue. If not, see <https://www.gnu.org/licenses/>.
(define-module (tissue git)
#:use-module (rnrs arithmetic bitwise)
#:use-module (rnrs hashtables)
#:use-module (rnrs io ports)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-171)
#:use-module (ice-9 match)
#:use-module (git)
#:use-module (git types)
;; There are many name conflicts between (system foreign). So, we
;; carefully select a few and prefix the rest.
#:use-module ((system foreign) #:select (%null-pointer
null-pointer?
pointer->string
make-pointer
dereference-pointer))
#:use-module ((system foreign) #:prefix foreign:)
#:use-module ((bytestructures guile) #:select (bs:pointer
bs:struct
bs:vector
bytestructure-ref))
#:use-module ((bytestructures guile) #:prefix bs:)
#:use-module (tissue utils)
#:export (git-top-level
current-git-repository
commit-date
git-tracked-files
file-modification-table))
;; We bind additional functions from libgit2 that are not already
;; bound in guile-git. TODO: Contribute them to guile-git.
(define pointer->bytestructure
(@@ (git structs) pointer->bytestructure))
(define bytestructure->pointer
(@@ (git structs) bytestructure->pointer))
(define %oid
(bs:vector 20 bs:uint8))
(define %index-time
(bs:struct `((seconds ,bs:int32)
(nanoseconds ,bs:uint32))))
(define %index-entry
(bs:struct `((ctime ,%index-time)
(mtime ,%index-time)
(dev ,bs:uint32)
(ino ,bs:uint32)
(mode ,bs:uint32)
(uid ,bs:uint32)
(gid ,bs:uint32)
(file-size ,bs:uint32)
(id ,%oid)
(flags ,bs:uint16)
(flags-extended ,bs:uint16)
(path ,(bs:pointer bs:uint8)))))
(define-record-type <index-time>
(%make-index-time seconds nanoseconds)
index-time?
(seconds index-time-seconds)
(nanoseconds index-time-nanoseconds))
(define (pointer->index-time pointer)
(if (null-pointer? pointer)
#f
(let ((bs (pointer->bytestructure pointer %index-time)))
(%make-index-time
(bytestructure-ref bs 'seconds)
(bytestructure-ref bs 'nanoseconds)))))
(define-record-type <index-entry>
(%make-index-entry ctime mtime dev ino mode uid gid file-size id flags path)
index-entry?
(ctime index-entry-ctime)
(mtime index-entry-mtime)
(dev index-entry-dev)
(ino index-entry-ino)
(mode index-entry-mode)
(uid index-entry-uid)
(gid index-entry-gid)
(file-size index-entry-file-size)
(id index-entry-id)
(flags index-entry-flags)
(path index-entry-path))
(define (pointer->index-entry pointer)
(if (null-pointer? pointer)
#f
(let* ((bs (pointer->bytestructure pointer %index-entry))
(flags (bytestructure-ref bs 'flags)))
(%make-index-entry
(pointer->index-time
(bytestructure->pointer (bytestructure-ref bs 'ctime)))
(pointer->index-time
(bytestructure->pointer (bytestructure-ref bs 'mtime)))
(bytestructure-ref bs 'dev)
(bytestructure-ref bs 'ino)
(bytestructure-ref bs 'mode)
(bytestructure-ref bs 'uid)
(bytestructure-ref bs 'gid)
(bytestructure-ref bs 'file-size)
(pointer->oid
(bytestructure->pointer (bytestructure-ref bs 'id)))
(if (zero? (logand flags
(bitwise-arithmetic-shift 1 15)))
(list)
(list 'assume-valid))
(pointer->string
(make-pointer (bytestructure-ref bs 'path))
(bitwise-and flags (bitwise-not (bitwise-arithmetic-shift 1 13))))))))
;; The repository-index function in guile-git has a bug. See
;; https://gitlab.com/guile-git/guile-git/-/merge_requests/34 . To
;; work around this, we redefine it here.
(define repository-index
(let ((proc (libgit2->procedure* "git_repository_index" (list '* '*))))
(lambda (repository)
(let ((out (make-double-pointer)))
(proc out (repository->pointer repository))
(pointer->index (dereference-pointer out))))))
(define index-version
(let ((proc (libgit2->procedure foreign:unsigned-int "git_index_version" (list '*))))
(lambda (index)
(proc (index->pointer index)))))
(define index-entry-count
(compose (libgit2->procedure foreign:size_t "git_index_entrycount" (list '*))
index->pointer))
(define index-entry
(let ((proc (libgit2->procedure '* "git_index_get_byindex" (list '* foreign:size_t))))
(lambda (index n)
(unless (= (index-version index) 2)
(error "Unsupported git index version:" (index-version index)))
(pointer->index-entry (proc (index->pointer index) n)))))
(define (index-entries index)
"Return the list of all entries in INDEX, a <git-index> object. The
return value is a list of <index-entry> objects."
(map (lambda (i)
(index-entry index i))
(iota (index-entry-count index))))
(define diff-find-similar!
(let ((proc (libgit2->procedure* "git_diff_find_similar" '(* *))))
(lambda (diff)
(proc (diff->pointer diff) %null-pointer)
diff)))
(define (git-top-level)
"Return the top-level directory of the current git
repository."
(let loop ((curdir (getcwd)))
(cond
((file-exists? (string-append curdir "/.git"))
curdir)
((string=? curdir "/")
(error "No git top level found"))
(else
(loop (dirname curdir))))))
(define (current-git-repository)
"Return the current git repository."
(repository-open (git-top-level)))
(define (commit-date commit)
(time-monotonic->date
(make-time time-monotonic
0
(commit-time commit))
(* 60 (commit-time-offset commit))))
(define (git-tracked-files repository)
"Return a list of all files tracked in REPOSITORY. The returned
filenames are relative to the top-level directory of REPOSITORY and do
not have a leading slash."
(map index-entry-path
(index-entries (repository-index repository))))
(define (commit-deltas repository commit)
"Return the list of <diff-delta> objects created by COMMIT with
respect to its first parent in REPOSITORY."
(match (commit-parents commit)
((parent _ ...)
(let ((diff (diff-tree-to-tree repository
(commit-tree parent)
(commit-tree commit))))
(diff-find-similar! diff)
(diff-fold (lambda (delta progress result)
(cons delta result))
(lambda (delta binary result)
result)
(lambda (delta hunk result)
result)
(lambda (delta hunk line result)
result)
(list)
diff)))
(() (list))))
(define (file-modification-table repository)
"Return a hashtable mapping files to the list of commits in REPOSITORY
that modified them."
(let ((result (make-hashtable string-hash string=?))
(renames (make-hashtable string-hash string=?)))
(fold-commits
(lambda (commit _)
(map (lambda (delta)
;; Map old filename to current filename if they are
;; different. Note that this manner of following renames
;; requires a linear git history and will not work with
;; branch merges.
(unless (string=? (diff-file-path (diff-delta-old-file delta))
(diff-file-path (diff-delta-new-file delta)))
(hashtable-set! renames
(diff-file-path (diff-delta-old-file delta))
(diff-file-path (diff-delta-new-file delta))))
(hashtable-update! result
;; If necessary, translate old
;; filename to current filename.
(hashtable-ref renames
(diff-file-path (diff-delta-old-file delta))
(diff-file-path (diff-delta-old-file delta)))
(cut cons commit <>)
(list)))
(commit-deltas repository commit)))
#f
repository)
result))
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