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store: Rewrite 'store-path-hash-part' to not use regexps. 

* guix/store.scm (store-path-hash-part): Rewrite without using a
regexp.  This speeds up 'guix substitute'.
This commit is contained in:
Ludovic Courtès 2017-07-21 14:50:16 +02:00 committed by Ludovic Courtès
parent 33463986ba
commit 35eb77b09d
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1 changed files with 6 additions and 3 deletions
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9
guix/store.scm
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@ -1549,9 +1549,12 @@ valid inputs."
(define (store-path-hash-part path)
"Return the hash part of PATH as a base32 string, or #f if PATH is not a
syntactically valid store path."
(let ((path-rx (store-regexp* (%store-prefix))))
(and=> (regexp-exec path-rx path)
(cut match:substring <> 1))))
(and (string-prefix? (%store-prefix) path)
(let ((base (string-drop path (+ 1 (string-length (%store-prefix))))))
(and (> (string-length base) 33)
(let ((hash (string-take base 32)))
(and (string-every %nix-base32-charset hash)
hash))))))
(define (log-file store file)
"Return the build log file for FILE, or #f if none could be found. FILE