Browse Source

store: Optimize 'store-path-package-name' and 'store-path-hash-part'.

* guix/store.scm (store-regexp*): New procedure.
  (store-path-package-name, store-path-hash-part): Use it.
wip-grafts
Ludovic Courtès 8 years ago
parent
commit
5c0f184536
  1. 22
      guix/store.scm

22
guix/store.scm

@ -653,21 +653,25 @@ valid inputs."
"Return #t if PATH is a derivation path."
(and (store-path? path) (string-suffix? ".drv" path)))
(define store-regexp*
;; The substituter makes repeated calls to 'store-path-hash-part', hence
;; this optimization.
(memoize
(lambda (store)
"Return a regexp matching a file in STORE."
(make-regexp (string-append "^" (regexp-quote store)
"/([0-9a-df-np-sv-z]{32})-([^/]+)$")))))
(define (store-path-package-name path)
"Return the package name part of PATH, a file name in the store."
(define store-path-rx
(make-regexp (string-append "^.*" (regexp-quote (%store-prefix))
"/[^-]+-(.+)$")))
(and=> (regexp-exec store-path-rx path)
(cut match:substring <> 1)))
(let ((path-rx (store-regexp* (%store-prefix))))
(and=> (regexp-exec path-rx path)
(cut match:substring <> 2))))
(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 (make-regexp
(string-append"^" (regexp-quote (%store-prefix))
"/([0-9a-df-np-sv-z]{32})-[^/]+$"))))
(let ((path-rx (store-regexp* (%store-prefix))))
(and=> (regexp-exec path-rx path)
(cut match:substring <> 1))))

Loading…
Cancel
Save