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hg-download: Add helpers for defining packages. 

Hg followup to commit ee17a9e06e.

* guix/hg-download.scm (hg-version, hg-file-name): New procedures.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
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Xinglu Chen 2021-06-05 21:18:26 +02:00 committed by Ludovic Courtès
parent 2ac5e07a89
commit aaafd19bd1
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1 changed files with 23 additions and 1 deletions
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@ -1,6 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz>
;;;
;;; This file is part of GNU Guix.
;;;
@ -25,6 +26,8 @@
#:use-module (guix modules)
#:use-module (guix packages)
#:autoload (guix build-system gnu) (standard-packages)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (ice-9 match)
#:use-module (ice-9 popen)
#:use-module (ice-9 rdelim)
@ -34,7 +37,9 @@
hg-reference-changeset
hg-reference-recursive?
hg-predicate
hg-fetch))
hg-fetch
hg-version
hg-file-name))
;;; Commentary:
;;;
@ -102,6 +107,23 @@ HASH-ALGO (a symbol). Use NAME as the file name, or a generic name if #f."
#:recursive? #t
#:guile-for-build guile)))
(define (hg-version version revision changeset)
"Return the version string for packages using hg-download."
;; hg-version is almost exclusively executed while modules are being loaded.
;; This makes any errors hide their backtrace. Avoid the mysterious error
;; "Value out of range 0 to N: 7" when the commit ID is too short, which
;; can happen, for example, when the user swapped the revision and commit
;; arguments by mistake.
(when (< (string-length changeset) 7)
(raise
(condition
(&message (message "hg-version: changeset ID unexpectedly short")))))
(string-append version "-" revision "." (string-take changeset 7)))
(define (hg-file-name name version)
"Return the file-name for packages using hg-download."
(string-append name "-" version "-checkout"))
(define (hg-file-list directory)
"Evaluates to a list of files contained in the repository at path
@var{directory}"