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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 conditions)
#:use-module (rnrs hashtables)
#:use-module (rnrs io ports)
#:use-module (srfi srfi-1)
#: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)
#:use-module ((system foreign) #:select (%null-pointer
dereference-pointer
pointer->string
string->pointer))
#:use-module (bytestructures guile)
#:use-module (tissue utils)
#:export (reference-set-target!
reference-symbolic-target
condition-git-error
git-top-level
%current-git-repository
current-git-repository
commit-author-date
git-tracked-files
call-with-file-in-git
file-modification-table
clone-options))
;; We bind additional functions from libgit2 that are not already
;; bound in guile-git. TODO: Contribute them to guile-git.
(define diff-find-similar!
(let ((proc (libgit2->procedure* "git_diff_find_similar" '(* *))))
(lambda (diff)
(proc (diff->pointer diff) %null-pointer)
diff)))
(define reference-set-target!
(let ((proc (libgit2->procedure* "git_reference_set_target" '(* * * *))))
(lambda* (reference oid #:optional log-message)
(let ((out (make-double-pointer)))
(proc out
(reference->pointer reference)
(oid->pointer oid)
(if log-message
(string->pointer log-message)
%null-pointer))
(pointer->reference (dereference-pointer out))))))
(define reference-symbolic-target
(let ((proc (libgit2->procedure '* "git_reference_symbolic_target" '(*))))
(lambda (reference)
(pointer->string
(proc (reference->pointer reference))))))
(define (condition-git-error condition)
"Return <git-error> object from CONDITION. If none, return #f."
(and (irritants-condition? condition)
(find git-error? (condition-irritants condition))))
(define %current-git-repository
(make-parameter #f))
(define (current-git-repository)
"Return the current git repository, either the repository specified by
the %current-git-repository parameter or the repository at the current
directory."
(or (%current-git-repository)
(repository-open-ext (getcwd) (list))))
(define (git-top-level)
"Return the top-level directory of the current git repository."
(dirname (repository-directory (current-git-repository))))
(define (head-tree repository)
"Return tree of HEAD in REPOSITORY."
(commit-tree
(commit-lookup repository
(reference-name->oid repository "HEAD"))))
(define (commit-author-date commit)
"Return the author date of COMMIT as an SRFI-19 date object."
(let ((time (signature-when (commit-author commit))))
(time-monotonic->date
(make-time time-monotonic
0
(time-time time))
(* 60 (time-offset time)))))
(define* (git-tracked-files #:optional (repository (current-git-repository)))
"Return a list of all files and directories tracked in REPOSITORY. The
returned paths are relative to the top-level directory of REPOSITORY
and do not have a leading slash."
(tree-list (head-tree repository)))
(define (call-with-file-in-git repository path proc)
"Call PROC on an input port reading contents of PATH in REPOSITORY."
(let* ((path-tree-entry (tree-entry-bypath (head-tree repository)
path))
(path-object (tree-entry->object repository path-tree-entry))
(blob (blob-lookup repository (object-id path-object))))
(call-with-port (open-bytevector-input-port (blob-content blob))
proc)))
(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))
(define* (clone-options #:key bare?)
(let ((clone-options (make-clone-options)))
(bytestructure-set!
(clone-options-bytestructure clone-options)
'bare
(if bare? 1 0))
clone-options))
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