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;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of Guix.
;;;
;;; Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix build utils)
#:use-module (srfi srfi-1)
#:export (directory-exists?
set-path-environment-variable))
(define (directory-exists? dir)
"Return #t if DIR exists and is a directory."
(pk 'dir-exists? dir
(let ((s (pk 'stat dir (stat dir #f))))
(and s
(eq? 'directory (stat:type s))))))
(define (search-path-as-list sub-directories input-dirs)
"Return the list of directories among SUB-DIRECTORIES that exist in
INPUT-DIRS. Example:
(search-path-as-list '(\"share/emacs/site-lisp\" \"share/emacs/24.1\")
(list \"/package1\" \"/package2\" \"/package3\"))
=> (\"/package1/share/emacs/site-lisp\"
\"/package3/share/emacs/site-lisp\")
"
(append-map (lambda (input)
(filter-map (lambda (dir)
(let ((dir (string-append input "/"
dir)))
(and (directory-exists? dir)
dir)))
sub-directories))
input-dirs))
(define (list->search-path-as-string lst separator)
(string-join lst separator))
(define* (set-path-environment-variable env-var sub-directories input-dirs
#:key (separator ":"))
"Look for each of SUB-DIRECTORIES in INPUT-DIRS. Set ENV-VAR to a
SEPARATOR-separated path accordingly. Example:
(set-path-environment-variable \"PKG_CONFIG\"
'(\"lib/pkgconfig\")
(list package1 package2))
"
(setenv env-var
(list->search-path-as-string (search-path-as-list sub-directories
input-dirs)
separator)))
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