;;; 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))))
d-aux?id=7f73f962ef632dd8b3715324c6bfef5f4ec4da6d'>build-aux</a>/<a href='/guix/log/build-aux/cuirass?id=7f73f962ef632dd8b3715324c6bfef5f4ec4da6d'>cuirass</a>/<a href='/guix/log/build-aux/cuirass/gnu-system.scm?id=7f73f962ef632dd8b3715324c6bfef5f4ec4da6d'>gnu-system.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/build-aux/cuirass/gnu-system.scm?id=7f73f962ef632dd8b3715324c6bfef5f4ec4da6d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-04-08 17:48:33 +0200'>2018-04-08</span></td><td><a href='/guix/commit/build-aux/cuirass/gnu-system.scm?id=a1ec7540be9b30593f5e83e36a0e83b1bcf337f1'>cuirass: Factorize hydra-to-cuirass CI job translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/cuirass/gnu-system.scm: Move code to...
* build-aux/cuirass/hydra-to-cuirass.scm: ... here, and include it.
* Makefile.am (EXTRA_DIST): Add 'build-aux/cuirass/hydra-to-cuirass.scm'
and 'build-aux/cuirass/gnu-system.scm'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-01-15 15:18:03 +0100'>2018-01-15</span></td><td><a href='/guix/commit/build-aux/cuirass/gnu-system.scm?id=403f2dccfcf992573ceeeae7c76c71b4884d3cd4'>cuirass: Properly convert list of &lt;license&gt; objects.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes a bug whereby we would 'write' raw &lt;license&gt; objects when they
were in a list.

* build-aux/cuirass/gnu-system.scm (entry-&gt;sexp-entry): Add recursive
case when O is a list.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-09-27 22:19:28 +0200'>2017-09-27</span></td><td><a href='/guix/commit/build-aux/cuirass/gnu-system.scm?id=66bc1d2aaf74fc7eb4ef9b3519c69bd37142ffb3'>cuirass: Add gnu-system build spec.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/hydra/gnu-system.scm (hydra-jobs): Support subset "hello".
* build-aux/cuirass/gnu-system.scm: New file.
* doc/guix.texi (Continuous Integration): Update example spec.
</span></span></td><td>Jan Nieuwenhuizen</td></tr>