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| author | Ricardo Wurmus <rekado@elephly.net> | 2019-02-06 13:03:26 +0100 |
|---|---|---|
| committer | Ricardo Wurmus <rekado@elephly.net> | 2019-02-06 13:03:26 +0100 |
| commit | ba88eea2b3a8a33ecd7fc0ec64e3917c6c2fe21d (patch) | |
| tree | 75c68e44d3d76440f416552711b1a47ec83e411e /gnu/installer/utils.scm | |
| parent | f380f9d55e6757c242acf6c71c4a3ccfcdb066b2 (diff) | |
| parent | 4aeb7f34c948f32363f2ae29c6942c6328df758c (diff) | |
Merge branch 'master' into core-updates
Diffstat (limited to 'gnu/installer/utils.scm')
| -rw-r--r-- | gnu/installer/utils.scm | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/gnu/installer/utils.scm b/gnu/installer/utils.scm new file mode 100644 index 0000000000..e91f90a84d --- /dev/null +++ b/gnu/installer/utils.scm @@ -0,0 +1,63 @@ +;;; 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)))) |