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authorLudovic Courtès <ludo@gnu.org>2017-06-26 17:48:28 +0200
committerLudovic Courtès <ludo@gnu.org>2018-12-19 23:52:25 +0100
commit87b711d200ad13eaef284bdd1ab77f85618b0498 (patch)
treeda4d5c6a0261e64ae1858a048c2e64d2930b180e /guix/utils.scm
parent0b1be8fd57233c11e3b8ad71bd20af9349539cbd (diff)
utils: Memoize 'absolute-dirname'.
* guix/utils.scm (absolute-dirname): Wrap in 'mlambda'.
Diffstat (limited to 'guix/utils.scm')
-rw-r--r--guix/utils.scm22
1 files changed, 12 insertions, 10 deletions
diff --git a/guix/utils.scm b/guix/utils.scm
index 9bad06d52f..ed1a418cca 100644
--- a/guix/utils.scm
+++ b/guix/utils.scm
@@ -731,17 +731,19 @@ environment variable name like \"XDG_CONFIG_HOME\"; SUFFIX is a suffix like
;;; Source location.
;;;
-(define (absolute-dirname file)
- "Return the absolute name of the directory containing FILE, or #f upon
+(define absolute-dirname
+ ;; Memoize to avoid repeated 'stat' storms from 'search-path'.
+ (mlambda (file)
+ "Return the absolute name of the directory containing FILE, or #f upon
failure."
- (match (search-path %load-path file)
- (#f #f)
- ((? string? file)
- ;; If there are relative names in %LOAD-PATH, FILE can be relative and
- ;; needs to be canonicalized.
- (if (string-prefix? "/" file)
- (dirname file)
- (canonicalize-path (dirname file))))))
+ (match (search-path %load-path file)
+ (#f #f)
+ ((? string? file)
+ ;; If there are relative names in %LOAD-PATH, FILE can be relative and
+ ;; needs to be canonicalized.
+ (if (string-prefix? "/" file)
+ (dirname file)
+ (canonicalize-path (dirname file)))))))
(define-syntax current-source-directory
(lambda (s)