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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 utils)
#:use-module (rnrs io ports)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (ice-9 filesystem)
#:use-module (ice-9 popen)
#:export (string-blank?
string-contains?
string-remove-prefix
string-remove-suffix
human-date-string
call-with-current-directory
call-with-temporary-directory
call-with-output-pipe
get-line-dos-or-unix
memoize-thunk))
(define (string-blank? str)
"Return #t if STR contains only whitespace. Else, return #f."
(string-every char-set:whitespace str))
(define (string-contains? str1 str2)
"Return #t if STR1 contains STR2. Else, return #f. This is different
from string-contains in that it does not return the index in STR1
where STR2 occurs as a substring."
(and (string-contains str1 str2)
#t))
(define (string-remove-prefix prefix str)
"Remove PREFIX from STR."
(substring str (string-length prefix)))
(define (string-remove-suffix suffix str)
"Remove SUFFIX from STR."
(substring str 0 (- (string-length str)
(string-length suffix))))
(define (human-date-string date)
"Return a human readable rendering of DATE."
(let ((elapsed-time
(time-second
(time-difference (date->time-monotonic (current-date))
(date->time-monotonic date)))))
(cond
((< elapsed-time (* 2 60))
(format #f "~a seconds ago" elapsed-time))
((< elapsed-time (* 2 60 60))
(format #f "~a minutes ago" (round (/ elapsed-time 60))))
((< elapsed-time (* 2 24 60 60))
(format #f "~a hours ago" (round (/ elapsed-time 60 60))))
((< elapsed-time (* 2 7 24 60 60))
(format #f "~a days ago" (round (/ elapsed-time 60 60 24))))
((< elapsed-time (* 2 30 24 60 60))
(format #f "~a weeks ago" (round (/ elapsed-time 60 60 24 7))))
(else
(format #f "on ~a" (date->string date "~b ~d ~Y"))))))
(define (call-with-current-directory curdir thunk)
"Call THUNK with current directory set to CURDIR. Restore current
directory after THUNK returns."
(let ((original-current-directory (getcwd)))
(dynamic-wind (cut chdir curdir)
thunk
(cut chdir original-current-directory))))
(define* (call-with-temporary-directory proc #:optional (parent-directory (getcwd)))
"Call PROC with a new temporary directory in PARENT-DIRECTORY, and
delete it when PROC returns or exits non-locally."
(let ((temporary-directory (mkdtemp (string-append parent-directory "/XXXXXX"))))
(dynamic-wind (const #t)
(cut proc temporary-directory)
(lambda ()
(when (file-exists? temporary-directory)
(delete-file-recursively temporary-directory))))))
(define (call-with-output-pipe proc program . args)
"Execute PROGRAM ARGS ... in a subprocess with a pipe to it. Call PROC
with an output port to that pipe. Close the pipe once PROC exits, even
if it exits non-locally. Return the value returned by PROC."
(let ((port #f))
(dynamic-wind
(cut set! port (apply open-pipe* OPEN_WRITE program args))
(cut proc port)
(lambda ()
(let ((return-value (status:exit-val (close-pipe port))))
(unless (and return-value
(zero? return-value))
(error "Invocation of program failed" (cons program args))))))))
(define (get-line-dos-or-unix port)
"Read line from PORT. This differs from `get-line' in (rnrs io
ports) in that it also supports DOS line endings."
(let ((line (get-line port)))
(if (eof-object? line)
line
(string-trim-right line #\return))))
(define (memoize-thunk thunk)
"Return a function memoizing THUNK."
(let ((result #f))
(lambda ()
(unless result
(set! result (thunk)))
result)))
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