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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
parent5cdb6bd2db0b465fa616a9fd36760b14844d5c48 (diff)
downloadguix-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')
-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))))