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;;; tissue --- Text based issue tracker
;;; Copyright © 2023 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/>.
(import (srfi srfi-26)
(srfi srfi-64)
(ice-9 match))
(define (with-variable variable value thunk)
"Set VARIABLE to VALUE, run THUNK and restore the old value of
VARIABLE. Return the value returned by THUNK."
(let ((old-value (variable-ref variable)))
(dynamic-wind
(cut variable-set! variable value)
thunk
(cut variable-set! variable old-value))))
(define (with-variables variable-bindings thunk)
"Set VARIABLE-BINDINGS, run THUNK and restore the old values of the
variables. Return the value returned by THUNK. VARIABLE-BINDINGS is a
list of pairs mapping variables to their values."
(match variable-bindings
(((variable . value) tail ...)
(with-variable variable value
(cut with-variables tail thunk)))
(() (thunk))))
(define-syntax-rule (var@@ module-name variable-name)
(module-variable (resolve-module 'module-name)
'variable-name))
(test-begin "git")
(test-equal "Infer changes by root commit"
'(("foo" . "foo")
("bar" . "bar"))
(with-variables (list (cons (var@@ (git) commit-parents)
(const (list)))
(cons (var@@ (git) commit-tree)
(const #t))
(cons (var@@ (git) tree-list)
(const (list "foo" "bar"))))
(cut (@@ (tissue git) commit-file-changes)
#f #f)))
(test-end "git")
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