From 6b1891b0a174f0fcbf26d4f404d3c2b4c63eb3e2 Mon Sep 17 00:00:00 2001 From: Ludovic Courtès Date: Sat, 30 Jun 2012 16:37:19 +0200 Subject: Add (distro) with a package searching facility. * Makefile.am (MODULES): Add `distro.scm'. * distro.scm: New file. * po/POTFILES.in: Add it. * tests/packages.scm ("find-packages-by-name", "find-packages-by-name with version"): New tests. --- distro.scm | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 distro.scm (limited to 'distro.scm') diff --git a/distro.scm b/distro.scm new file mode 100644 index 0000000000..784e537deb --- /dev/null +++ b/distro.scm @@ -0,0 +1,94 @@ +;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*- +;;; Copyright (C) 2012 Ludovic Courtès +;;; +;;; 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 . + +(define-module (distro) + #:use-module (guix packages) + #:use-module (ice-9 ftw) + #:use-module (srfi srfi-1) + #:use-module (srfi srfi-26) + #:export (find-packages-by-name)) + +;;; Commentary: +;;; +;;; General utilities for the software distribution---i.e., the modules under +;;; (distro ...). +;;; +;;; Code: + +(define _ (cut gettext <> "guix")) + +(define %distro-module-directory + ;; Absolute path of the (distro ...) module root. + (string-append (dirname (search-path %load-path "distro.scm")) + "/distro")) + +(define (package-files) + "Return the list of files that implement distro modules." + (define prefix-len + (string-length (dirname %distro-module-directory))) + + (file-system-fold (const #t) ; enter? + (lambda (path stat result) ; leaf + (if (string-suffix? ".scm" path) + (cons (substring path prefix-len) result) + result)) + (lambda (path stat result) ; down + result) + (lambda (path stat result) ; up + result) + (const #f) ; skip + (lambda (path stat errno result) + (format (current-error-port) + (_ "warning: cannot access `~a': ~a") + path (strerror errno)) + result) + '() + %distro-module-directory + stat)) + +(define (package-modules) + "Return the list of modules that provide packages for the distribution." + (define not-slash + (char-set-complement (char-set #\/))) + + (filter-map (lambda (path) + (let ((name (map string->symbol + (string-tokenize (string-drop-right path 4) + not-slash)))) + (false-if-exception (resolve-interface name)))) + (package-files))) + +(define* (find-packages-by-name name #:optional version) + "Return the list of packages with the given NAME. If VERSION is not #f, +then only return packages whose version is equal to VERSION." + (define right-package? + (if version + (lambda (p) + (and (package? p) + (string=? (package-name p) name) + (string=? (package-version p) version))) + (lambda (p) + (and (package? p) + (string=? (package-name p) name))))) + + (append-map (lambda (module) + (filter right-package? + (module-map (lambda (sym var) + (variable-ref var)) + module))) + (package-modules))) -- cgit v1.2.3