installer: Add new utils.
* gnu/installer/utils.scm (nearest-exact-integer): New exported procedure, (read-percentage): ditto, (run-shell-command): ditto.
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@ -17,10 +17,16 @@
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu installer utils)
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#:use-module (guix utils)
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#:use-module (guix build utils)
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 regex)
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#:use-module (ice-9 textual-ports)
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#:export (read-lines
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read-all))
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read-all
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nearest-exact-integer
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read-percentage
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run-shell-command))
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(define* (read-lines #:optional (port (current-input-port)))
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"Read lines from PORT and return them as a list."
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@ -35,3 +41,23 @@
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"Return the content of the given FILE as a string."
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(call-with-input-file file
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get-string-all))
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(define (nearest-exact-integer x)
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"Given a real number X, return the nearest exact integer, with ties going to
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the nearest exact even integer."
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(inexact->exact (round x)))
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(define (read-percentage percentage)
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"Read PERCENTAGE string and return the corresponding percentage as a
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number. If no percentage is found, return #f"
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(let ((result (string-match "^([0-9]+)%$" percentage)))
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(and result
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(string->number (match:substring result 1)))))
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(define (run-shell-command command)
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(call-with-temporary-output-file
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(lambda (file port)
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(format port "~a~%" command)
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;; (format port "exit~%")
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(close port)
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(invoke "bash" "--init-file" file))))
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