52 lines
2.0 KiB
Scheme
52 lines
2.0 KiB
Scheme
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix import utils)
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#:use-module (ice-9 match)
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#:use-module (ice-9 regex)
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#:use-module (srfi srfi-1)
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#:export (factorize-uri))
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(define (factorize-uri uri version)
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"Factorize URI, a package tarball URI as a string, such that any occurrences
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of the string VERSION is replaced by the symbol 'version."
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(let ((version-rx (make-regexp (regexp-quote version))))
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(match (regexp-exec version-rx uri)
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(#f
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uri)
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(_
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(let ((indices (fold-matches version-rx uri
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'((0))
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(lambda (m result)
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(match result
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(((start) rest ...)
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`((,(match:end m))
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(,start . ,(match:start m))
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,@rest)))))))
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(fold (lambda (index result)
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(match index
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((start)
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(cons (substring uri start)
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result))
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((start . end)
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(cons* (substring uri start end)
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'version
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result))))
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'()
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indices))))))
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