65 lines
2.5 KiB
Scheme
65 lines
2.5 KiB
Scheme
;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
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;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of Guix.
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;;;
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;;; 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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;;; 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 Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix build utils)
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#:use-module (srfi srfi-1)
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#:export (directory-exists?
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set-path-environment-variable))
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(define (directory-exists? dir)
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"Return #t if DIR exists and is a directory."
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(let ((s (stat dir #f)))
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(and s
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(eq? 'directory (stat:type s)))))
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(define (search-path-as-list sub-directories input-dirs)
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"Return the list of directories among SUB-DIRECTORIES that exist in
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INPUT-DIRS. Example:
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(search-path-as-list '(\"share/emacs/site-lisp\" \"share/emacs/24.1\")
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(list \"/package1\" \"/package2\" \"/package3\"))
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=> (\"/package1/share/emacs/site-lisp\"
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\"/package3/share/emacs/site-lisp\")
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"
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(append-map (lambda (input)
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(filter-map (lambda (dir)
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(let ((dir (string-append input "/"
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dir)))
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(and (directory-exists? dir)
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dir)))
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sub-directories))
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input-dirs))
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(define (list->search-path-as-string lst separator)
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(string-join lst separator))
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(define* (set-path-environment-variable env-var sub-directories input-dirs
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#:key (separator ":"))
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"Look for each of SUB-DIRECTORIES in INPUT-DIRS. Set ENV-VAR to a
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SEPARATOR-separated path accordingly. Example:
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(set-path-environment-variable \"PKG_CONFIG\"
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'(\"lib/pkgconfig\")
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(list package1 package2))
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"
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(setenv env-var
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(list->search-path-as-string (search-path-as-list sub-directories
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input-dirs)
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separator)))
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