civodul pushed a commit to branch master
in repository guix.
commit f14c933df16ee0faee6bff8004da4e5d3e1caf07
Author: Ludovic Courtès <l...@gnu.org>
Date: Fri Feb 16 18:31:46 2018 +0100
Add (guix glob).
* guix/glob.scm, tests/glob.scm: New files.
* Makefile.am (MODULES): Add guix/glob.scm.
(SCM_TESTS): Add tests/glob.scm.
---
Makefile.am | 4 ++-
guix/glob.scm | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tests/glob.scm | 58 +++++++++++++++++++++++++++++++++++
3 files changed, 158 insertions(+), 1 deletion(-)
diff --git a/Makefile.am b/Makefile.am
index e2c940c..6556799 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,5 +1,5 @@
# GNU Guix --- Functional package management for GNU
-# Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <l...@gnu.org>
+# Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès
<l...@gnu.org>
# Copyright © 2013 Andreas Enge <andr...@enge.fr>
# Copyright © 2015, 2017 Alex Kost <alez...@gmail.com>
# Copyright © 2016, 2018 Mathieu Lirzin <m...@gnu.org>
@@ -83,6 +83,7 @@ MODULES = \
guix/gnu-maintenance.scm \
guix/upstream.scm \
guix/licenses.scm \
+ guix/glob.scm \
guix/git.scm \
guix/graph.scm \
guix/cache.scm \
@@ -314,6 +315,7 @@ SCM_TESTS = \
tests/substitute.scm \
tests/builders.scm \
tests/derivations.scm \
+ tests/glob.scm \
tests/grafts.scm \
tests/ui.scm \
tests/records.scm \
diff --git a/guix/glob.scm b/guix/glob.scm
new file mode 100644
index 0000000..4fc5173
--- /dev/null
+++ b/guix/glob.scm
@@ -0,0 +1,97 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Ludovic Courtès <l...@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU 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.
+;;;
+;;; GNU 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix glob)
+ #:use-module (ice-9 match)
+ #:export (compile-glob-pattern
+ glob-match?))
+
+;;; Commentary:
+;;;
+;;; This is a minimal implementation of "glob patterns" (info "(libc)
+;;; Globbbing"). It is currently limited to simple patterns and does not
+;;; support braces and square brackets, for instance.
+;;;
+;;; Code:
+
+(define (wildcard-indices str)
+ "Return the list of indices in STR where wildcards can be found."
+ (let loop ((index 0)
+ (result '()))
+ (if (= index (string-length str))
+ (reverse result)
+ (loop (+ 1 index)
+ (case (string-ref str index)
+ ((#\? #\*) (cons index result))
+ (else result))))))
+
+(define (compile-glob-pattern str)
+ "Return an sexp that represents the compiled form of STR, a glob pattern
+such as \"foo*\" or \"foo??bar\"."
+ (define flatten
+ (match-lambda
+ (((? string? str)) str)
+ (x x)))
+
+ (let loop ((index 0)
+ (indices (wildcard-indices str))
+ (result '()))
+ (match indices
+ (()
+ (flatten (cond ((zero? index)
+ (list str))
+ ((= index (string-length str))
+ (reverse result))
+ (else
+ (reverse (cons (string-drop str index)
+ result))))))
+ ((wildcard-index . rest)
+ (let ((wildcard (match (string-ref str wildcard-index)
+ (#\? '?)
+ (#\* '*))))
+ (match (substring str index wildcard-index)
+ ("" (loop (+ 1 wildcard-index)
+ rest
+ (cons wildcard result)))
+ (str (loop (+ 1 wildcard-index)
+ rest
+ (cons* wildcard str result)))))))))
+
+(define (glob-match? pattern str)
+ "Return true if STR matches PATTERN, a compiled glob pattern as returned by
+'compile-glob-pattern'."
+ (let loop ((pattern pattern)
+ (str str))
+ (match pattern
+ ((? string? literal) (string=? literal str))
+ (((? string? one)) (string=? one str))
+ (('*) #t)
+ (('?) (= 1 (string-length str)))
+ (() #t)
+ (('* suffix . rest)
+ (match (string-contains str suffix)
+ (#f #f)
+ (index (loop rest
+ (string-drop str
+ (+ index (string-length suffix)))))))
+ (('? . rest)
+ (and (>= (string-length str) 1)
+ (loop rest (string-drop str 1))))
+ ((prefix . rest)
+ (and (string-prefix? prefix str)
+ (loop rest (string-drop str (string-length prefix))))))))
diff --git a/tests/glob.scm b/tests/glob.scm
new file mode 100644
index 0000000..033eeb1
--- /dev/null
+++ b/tests/glob.scm
@@ -0,0 +1,58 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Ludovic Courtès <l...@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU 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.
+;;;
+;;; GNU 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (test-glob)
+ #:use-module (guix glob)
+ #:use-module (srfi srfi-64))
+
+
+(test-begin "glob")
+
+(test-equal "compile-glob-pattern, no wildcards"
+ "foo"
+ (compile-glob-pattern "foo"))
+
+(test-equal "compile-glob-pattern, Kleene star"
+ '("foo" * "bar")
+ (compile-glob-pattern "foo*bar"))
+
+(test-equal "compile-glob-pattern, question mark"
+ '(? "foo" *)
+ (compile-glob-pattern "?foo*"))
+
+(test-assert "literal match"
+ (let ((pattern (compile-glob-pattern "foo")))
+ (and (glob-match? pattern "foo")
+ (not (glob-match? pattern "foobar"))
+ (not (glob-match? pattern "barfoo")))))
+
+(test-assert "trailing star"
+ (let ((pattern (compile-glob-pattern "foo*")))
+ (and (glob-match? pattern "foo")
+ (glob-match? pattern "foobar")
+ (not (glob-match? pattern "xfoo")))))
+
+(test-assert "question marks"
+ (let ((pattern (compile-glob-pattern "foo??bar")))
+ (and (glob-match? pattern "fooxxbar")
+ (glob-match? pattern "fooZZbar")
+ (not (glob-match? pattern "foobar"))
+ (not (glob-match? pattern "fooxxxbar"))
+ (not (glob-match? pattern "fooxxbarzz")))))
+
+(test-end "glob")
