mirror of
https://git.in.rschanz.org/ryan77627/guix.git
synced 2024-12-25 22:08:16 -05:00
3ad8f7757c
* gnu/installer/utils.scm (nearest-exact-integer): New exported procedure, (read-percentage): ditto, (run-shell-command): ditto.
63 lines
2.2 KiB
Scheme
63 lines
2.2 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
|
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
|
|
;;;
|
|
;;; This file is part of GNU Guix.
|
|
;;;
|
|
;;; GNU Guix 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.
|
|
;;;
|
|
;;; GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
(define-module (gnu installer utils)
|
|
#:use-module (guix utils)
|
|
#:use-module (guix build utils)
|
|
#:use-module (ice-9 rdelim)
|
|
#:use-module (ice-9 regex)
|
|
#:use-module (ice-9 textual-ports)
|
|
#:export (read-lines
|
|
read-all
|
|
nearest-exact-integer
|
|
read-percentage
|
|
run-shell-command))
|
|
|
|
(define* (read-lines #:optional (port (current-input-port)))
|
|
"Read lines from PORT and return them as a list."
|
|
(let loop ((line (read-line port))
|
|
(lines '()))
|
|
(if (eof-object? line)
|
|
(reverse lines)
|
|
(loop (read-line port)
|
|
(cons line lines)))))
|
|
|
|
(define (read-all file)
|
|
"Return the content of the given FILE as a string."
|
|
(call-with-input-file file
|
|
get-string-all))
|
|
|
|
(define (nearest-exact-integer x)
|
|
"Given a real number X, return the nearest exact integer, with ties going to
|
|
the nearest exact even integer."
|
|
(inexact->exact (round x)))
|
|
|
|
(define (read-percentage percentage)
|
|
"Read PERCENTAGE string and return the corresponding percentage as a
|
|
number. If no percentage is found, return #f"
|
|
(let ((result (string-match "^([0-9]+)%$" percentage)))
|
|
(and result
|
|
(string->number (match:substring result 1)))))
|
|
|
|
(define (run-shell-command command)
|
|
(call-with-temporary-output-file
|
|
(lambda (file port)
|
|
(format port "~a~%" command)
|
|
;; (format port "exit~%")
|
|
(close port)
|
|
(invoke "bash" "--init-file" file))))
|