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import: github: Improve readability.

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* guix/import/github.scm (latest-released-version): Use any and cond instead
of a recursive loop and an if-else ladder respectively.
This commit is contained in:
Arun Isaac 2019-01-21 01:43:09 +05:30
parent 6b7ea49bed
commit cb5fe915d2
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1 changed files with 26 additions and 29 deletions
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55
guix/import/github.scm
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@ -183,35 +183,32 @@ (define (pre-release? x)
API. This may be fixed by using an access token and setting the environment
variable GUIX_GITHUB_TOKEN, for instance one procured from
https://github.com/settings/tokens"))
(let loop ((releases
(match (remove pre-release? json)
(() json) ; keep everything
(releases releases))))
(match releases
(() ;empty release list
#f)
((release . rest) ;one or more releases
(let ((tag (or (hash-ref release "tag_name") ;a "release"
(hash-ref release "name"))) ;a tag
(name-length (string-length package-name)))
;; some tags include the name of the package e.g. "fdupes-1.51"
;; so remove these
(if (and (< name-length (string-length tag))
(string=? (string-append package-name "-")
(substring tag 0 (+ name-length 1))))
(substring tag (+ name-length 1))
;; some tags start with a "v" e.g. "v0.25.0"
;; where some are just the version number
(if (string-prefix? "v" tag)
(substring tag 1)
;; Finally, reject tags that don't start with a digit:
;; they may not represent a release.
(if (and (not (string-null? tag))
(char-set-contains? char-set:digit
(string-ref tag 0)))
tag
(loop rest)))))))))))
(any
(lambda (release)
(let ((tag (or (hash-ref release "tag_name") ;a "release"
(hash-ref release "name"))) ;a tag
(name-length (string-length package-name)))
(cond
;; some tags include the name of the package e.g. "fdupes-1.51"
;; so remove these
((and (< name-length (string-length tag))
(string=? (string-append package-name "-")
(substring tag 0 (+ name-length 1))))
(substring tag (+ name-length 1)))
;; some tags start with a "v" e.g. "v0.25.0"
;; where some are just the version number
((string-prefix? "v" tag)
(substring tag 1))
;; Finally, reject tags that don't start with a digit:
;; they may not represent a release.
((and (not (string-null? tag))
(char-set-contains? char-set:digit
(string-ref tag 0)))
tag)
(else #f))))
(match (remove pre-release? json)
(() json) ; keep everything
(releases releases))))))
(define (latest-release pkg)
"Return an <upstream-source> for the latest release of PKG."