diff options
Diffstat (limited to 'guix/utils.scm')
| -rw-r--r-- | guix/utils.scm | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/guix/utils.scm b/guix/utils.scm index 92e45de616..e9efea5866 100644 --- a/guix/utils.scm +++ b/guix/utils.scm @@ -1,5 +1,5 @@ ;;; GNU Guix --- Functional package management for GNU -;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org> ;;; Copyright © 2013, 2014, 2015 Mark H Weaver <mhw@netris.org> ;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org> ;;; Copyright © 2014 Ian Denhardt <ian@zenhack.net> @@ -84,6 +84,7 @@ version-major+minor version-major guile-version>? + version-prefix? string-replace-substring arguments-from-environment-variable file-extension @@ -521,6 +522,27 @@ minor version numbers from version-string." (micro-version)) str)) +(define version-prefix? + (let ((not-dot (char-set-complement (char-set #\.)))) + (lambda (v1 v2) + "Return true if V1 is a version prefix of V2: + + (version-prefix? \"4.1\" \"4.16.2\") => #f + (version-prefix? \"4.1\" \"4.1.2\") => #t +" + (define (list-prefix? lst1 lst2) + (match lst1 + (() #t) + ((head1 tail1 ...) + (match lst2 + (() #f) + ((head2 tail2 ...) + (and (equal? head1 head2) + (list-prefix? tail1 tail2))))))) + + (list-prefix? (string-tokenize v1 not-dot) + (string-tokenize v2 not-dot))))) + (define (file-extension file) "Return the extension of FILE or #f if there is none." (let ((dot (string-rindex file #\.))) |