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installer: Add new utils.

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* gnu/installer/utils.scm (nearest-exact-integer): New exported procedure,
(read-percentage): ditto,
(run-shell-command): ditto.
This commit is contained in:
Mathieu Othacehe 2018-12-05 14:24:04 +09:00 committed by Ludovic Courtès
parent 5cdb6bd2db
commit 3ad8f7757c
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GPG key ID: 090B11993D9AEBB5
1 changed files with 27 additions and 1 deletions
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28
gnu/installer/utils.scm
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@ -17,10 +17,16 @@
;;; 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))
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."
@ -35,3 +41,23 @@ (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))))