152 lines
5.5 KiB
Scheme
152 lines
5.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix import utils)
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#:use-module (guix base32)
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#:use-module ((guix build download) #:prefix build:)
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#:use-module (guix hash)
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#:use-module ((guix licenses) #:prefix license:)
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#:use-module (guix utils)
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#:use-module (ice-9 match)
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#:use-module (ice-9 regex)
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#:use-module (json)
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#:use-module (srfi srfi-1)
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#:export (factorize-uri
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hash-table->alist
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flatten
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assoc-ref*
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url-fetch
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guix-hash-url
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string->license
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license->symbol
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snake-case
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beautify-description))
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(define (factorize-uri uri version)
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"Factorize URI, a package tarball URI as a string, such that any occurrences
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of the string VERSION is replaced by the symbol 'version."
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(let ((version-rx (make-regexp (regexp-quote version))))
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(match (regexp-exec version-rx uri)
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(#f
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uri)
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(_
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(let ((indices (fold-matches version-rx uri
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'((0))
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(lambda (m result)
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(match result
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(((start) rest ...)
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`((,(match:end m))
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(,start . ,(match:start m))
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,@rest)))))))
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(fold (lambda (index result)
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(match index
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((start)
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(cons (substring uri start)
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result))
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((start . end)
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(cons* (substring uri start end)
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'version
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result))))
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'()
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indices))))))
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(define (hash-table->alist table)
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"Return an alist represenation of TABLE."
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(map (match-lambda
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((key . (lst ...))
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(cons key
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(map (lambda (x)
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(if (hash-table? x)
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(hash-table->alist x)
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x))
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lst)))
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((key . (? hash-table? table))
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(cons key (hash-table->alist table)))
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(pair pair))
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(hash-map->list cons table)))
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(define (flatten lst)
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"Return a list that recursively concatenates all sub-lists of LST."
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(fold-right
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(match-lambda*
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(((sub-list ...) memo)
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(append (flatten sub-list) memo))
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((elem memo)
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(cons elem memo)))
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'() lst))
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(define (assoc-ref* alist key . rest)
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"Return the value for KEY from ALIST. For each additional key specified,
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recursively apply the procedure to the sub-list."
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(if (null? rest)
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(assoc-ref alist key)
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(apply assoc-ref* (assoc-ref alist key) rest)))
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(define (url-fetch url file-name)
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"Save the contents of URL to FILE-NAME. Return #f on failure."
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(parameterize ((current-output-port (current-error-port)))
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(build:url-fetch url file-name)))
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(define (guix-hash-url filename)
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"Return the hash of FILENAME in nix-base32 format."
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(bytevector->nix-base32-string (file-sha256 filename)))
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(define (string->license str)
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"Convert the string STR into a license object."
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(match str
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("GNU LGPL" license:lgpl2.0)
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("GPL" license:gpl3)
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((or "BSD" "BSD License") license:bsd-3)
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((or "MIT" "MIT license" "Expat license") license:expat)
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("Public domain" license:public-domain)
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((or "Apache License, Version 2.0" "Apache 2.0") license:asl2.0)
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(_ #f)))
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(define (license->symbol license)
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"Convert license to a symbol representing the variable the object is bound
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to in the (guix licenses) module, or #f if there is no such known license."
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;; TODO: Traverse list public variables in (guix licenses) instead so we
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;; don't have to maintain a list manualy.
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(assoc-ref `((,license:lgpl2.0 . license:lgpl2.0)
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(,license:gpl3 . license:gpl3)
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(,license:bsd-3 . license:bsd-3)
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(,license:expat . license:expat)
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(,license:public-domain . license:public-domain)
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(,license:asl2.0 . license:asl2.0))
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license))
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(define (snake-case str)
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"Return a downcased version of the string STR where underscores are replaced
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with dashes."
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(string-join (string-split (string-downcase str) #\_) "-"))
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(define (beautify-description description)
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"Improve the package DESCRIPTION by turning a beginning sentence fragment
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into a proper sentence and by using two spaces between sentences."
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(let ((cleaned (if (string-prefix? "A " description)
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(string-append "This package provides a"
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(substring description 1))
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description)))
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;; Use double spacing between sentences
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(regexp-substitute/global #f "\\. \\b"
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cleaned 'pre ". " 'post)))
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