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| author | Ludovic Courtès <ludo@gnu.org> | 2013-11-12 22:56:13 +0100 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2013-11-13 00:29:05 +0100 |
| commit | 56b943de6e61f41d6ebd2dfa65ff886cdfd83759 (patch) | |
| tree | 3669027822242116653430944897e0a27ca58f55 /guix/utils.scm | |
| parent | be0f611208b4e6d730991267f69f9effe703e32f (diff) | |
| download | guix-56b943de6e61f41d6ebd2dfa65ff886cdfd83759.tar guix-56b943de6e61f41d6ebd2dfa65ff886cdfd83759.tar.gz | |
utils: Add 'string-replace-substring'.
* guix/utils.scm (string-replace-substring): New procedure. Based on
code by Mark H. Weaver.
* tests/utils.scm ("string-replace-substring"): New test.
Diffstat (limited to 'guix/utils.scm')
| -rw-r--r-- | guix/utils.scm | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/guix/utils.scm b/guix/utils.scm index 1f3c0c8ad6..b730340eda 100644 --- a/guix/utils.scm +++ b/guix/utils.scm @@ -1,5 +1,6 @@ ;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2013 Mark H Weaver <mhw@netris.org> ;;; ;;; This file is part of GNU Guix. ;;; @@ -62,6 +63,7 @@ guile-version>? package-name->name+version string-tokenize* + string-replace-substring file-extension file-sans-extension call-with-temporary-output-file @@ -387,6 +389,28 @@ like `string-tokenize', but SEPARATOR is a string." (else (reverse (cons string result)))))) +(define* (string-replace-substring str substr replacement + #:optional + (start 0) + (end (string-length str))) + "Replace all occurrences of SUBSTR in the START--END range of STR by +REPLACEMENT." + (match (string-length substr) + (0 + (error "string-replace-substring: empty substring")) + (substr-length + (let loop ((start start) + (pieces (list (substring str 0 start)))) + (match (string-contains str substr start end) + (#f + (string-concatenate-reverse + (cons (substring str start) pieces))) + (index + (loop (+ index substr-length) + (cons* replacement + (substring str start index) + pieces)))))))) + (define (call-with-temporary-output-file proc) "Call PROC with a name of a temporary file and open output port to that file; close the file and delete it when leaving the dynamic extent of this |