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+;;; 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))))