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authorMathieu Othacehe <m.othacehe@gmail.com>2018-12-05 14:24:04 +0900
committerLudovic Courtès <ludo@gnu.org>2019-01-17 14:04:22 +0100
commit3ad8f7757c840de290a6035747578a18ff7279da (patch)
tree297270f20f55ef118fb4414a530f5ecb70179412 /gnu/installer
parent5cdb6bd2db0b465fa616a9fd36760b14844d5c48 (diff)
downloadguix-3ad8f7757c840de290a6035747578a18ff7279da.tar
guix-3ad8f7757c840de290a6035747578a18ff7279da.tar.gz
installer: Add new utils.
* gnu/installer/utils.scm (nearest-exact-integer): New exported procedure, (read-percentage): ditto, (run-shell-command): ditto.
Diffstat (limited to 'gnu/installer')
-rw-r--r--gnu/installer/utils.scm28
1 files changed, 27 insertions, 1 deletions
diff --git a/gnu/installer/utils.scm b/gnu/installer/utils.scm
index 5087683715..e91f90a84d 100644
--- a/gnu/installer/utils.scm
+++ b/gnu/installer/utils.scm
@@ -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 @@
"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))))