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import: github: Improve readability.

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* guix/import/github.scm (latest-released-version)[release->version]: Separate
out release->version as a new function.
This commit is contained in:
Arun Isaac 2019-05-14 15:44:46 +05:30
parent 0f9bbd32c1
commit c558772b0f
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1 changed files with 27 additions and 26 deletions
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53
guix/import/github.scm
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@ -174,6 +174,29 @@ the package e.g. 'bedtools2'. Return #f if there is no releases"
(define (pre-release? x)
(hash-ref x "prerelease"))
(define (release->version 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))))
(let* ((json (fetch-releases-or-tags url)))
(if (eq? json #f)
(if (%github-token)
@ -183,32 +206,10 @@ API when using a GitHub token")
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"))
(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))))))
(any release->version
(match (remove pre-release? json)
(() json) ; keep everything
(releases releases))))))
(define (latest-release pkg)
"Return an <upstream-source> for the latest release of PKG."