* guix/import/pypi.scm (compute-inputs, guess-requirements): New functions.
---
guix/import/pypi.scm | 146 ++++++++++++++++++++++++++++++++++++++++-----------
1 file changed, 115 insertions(+), 31 deletions(-)
diff --git a/guix/import/pypi.scm b/guix/import/pypi.scm
index 8567cad..9ac3342 100644
--- a/guix/import/pypi.scm
+++ b/guix/import/pypi.scm
@@ -21,6 +21,7 @@
#:use-module (ice-9 match)
#:use-module (ice-9 pretty-print)
#:use-module (ice-9 regex)
+ #:use-module ((ice-9 rdelim) #:select (read-line))
#:use-module (srfi srfi-1)
#:use-module (rnrs bytevectors)
#:use-module (json)
@@ -77,42 +78,125 @@ or #f on failure."
with dashes."
(string-join (string-split (string-downcase str) #\_) "-"))
-(define (guix-hash-url url)
- "Download the resource at URL and return the hash in nix-base32 format."
- (call-with-temporary-output-file
- (lambda (temp port)
- (and (url-fetch url temp)
- (bytevector->nix-base32-string
- (call-with-input-file temp port-sha256))))))
+(define (guix-hash-url filename)
+ "Return the hash of FILENAME in nix-base32 format."
+ (bytevector->nix-base32-string
+ (call-with-input-file filename port-sha256)))
+
+(define (guix-name name)
+ (if (string-prefix? "python-" name)
+ (snake-case name)
+ (string-append "python-" (snake-case name))))
+
+(define (maybe-inputs guix-name inputs)
+ (match inputs
+ (()
+ '())
+ ((inputs ...)
+ (list (list guix-name
+ (list 'quasiquote inputs))))))
+
+(define (guess-requirements source-url tarball)
+ "Given SOURCE-URL and a TARBALL of the package, return a list of the required
+packages specified in the requirements.txt file."
+
+ (define (tarball-directory url)
+ "Given the URL of the package's tarball, return the name of the directory
+that will be created upon decompressing it."
+ ;; TODO: Support more archive formats.
+ (let ((basename (substring url (+ 1 (string-rindex url #\/)))))
+ (cond
+ ((string-suffix? ".tar.gz" basename)
+ (string-drop-right basename 7))
+ ((string-suffix? ".tar.bz2" basename)
+ (string-drop-right basename 8))
+ (else #f))))
+
+ (define (read-requirements requirements-file)
+ "Given REQUIREMENTS-FILE, a Python requirements.txt file, return a list of
+name/variable pairs describing the requirements."
+ (call-with-input-file requirements-file
+ (lambda (port)
+ (let loop ((result '()))
+ (let ((line (read-line port)))
+ (if (eof-object? line)
+ result
+ (loop (if (or (string-null? line)
+ (eq? (string-ref line 0) #\#))
+ result
+ (let ((input (guix-name (clean-requirement line))))
+ ;; Argparse has been part of Python since 2.7.
+ (if (string=? input "python-argparse")
+ result
+ (cons input result)))))))))))
+
+ (define (clean-requirement s)
+ "Given a requirement LINE, as can be found in a Python requirements.txt
+file, remove everything other than the actual name of the required package, and
+return it."
+ (string-take s
+ (or (string-index s (lambda (c)
+ (member c '(#\< #\> #\= #\#))))
+ (string-length s))))
+
+ (let* ((dirname (tarball-directory source-url))
+ (req-file (if (string? dirname)
+ (string-append dirname "/requirements.txt")
+ #f)))
+ (if (and (string? req-file)
+ ;; TODO: support more formats.
+ (zero? (system* "tar" "xf" tarball req-file)))
+ (dynamic-wind
+ (const #t)
+ (lambda ()
+ (read-requirements req-file))
+ (lambda ()
+ (delete-file req-file)
+ (rmdir dirname)))
+ '())))
+
+(define (compute-inputs source-url tarball)
+ "Given the SOURCE-URL of an already downloaded TARBALL, return a list of
+name/variable pairs describing the required inputs of this package."
+ (sort
+ (map (lambda (input)
+ (list input (list 'unquote (string->symbol input))))
+ (append '("python-setuptools")
+ (guess-requirements source-url tarball)))
+ (lambda args
+ (match args
+ (((a _ ...) (b _ ...))
+ (string-ci<? a b))))))
(define (make-pypi-sexp name version source-url home-page synopsis
description license)
"Return the `package' s-expression for a python package with the given NAME,
VERSION, SOURCE-URL, HOME-PAGE, SYNOPSIS, DESCRIPTION, and LICENSE."
- `(package
- (name ,(if (string-prefix? "python-" name)
- (snake-case name)
- (string-append "python-" (snake-case name))))
- (version ,version)
- (source (origin
- (method url-fetch)
- (uri (string-append ,@(factorize-uri source-url version)))
- (sha256
- (base32
- ,(guix-hash-url source-url)))))
- (build-system python-build-system)
- (inputs
- `(("python-setuptools" ,python-setuptools)))
- (home-page ,home-page)
- (synopsis ,synopsis)
- (description ,description)
- (license ,(assoc-ref `((,lgpl2.0 . lgpl2.0)
- (,gpl3 . gpl3)
- (,bsd-3 . bsd-3)
- (,expat . expat)
- (,public-domain . public-domain)
- (,asl2.0 . asl2.0))
- license))))
+ (call-with-temporary-output-file
+ (lambda (temp port)
+ (and (url-fetch source-url temp)
+ `(package
+ (name ,(guix-name name))
+ (version ,version)
+ (source (origin
+ (method url-fetch)
+ (uri (string-append ,@(factorize-uri source-url
version)))
+ (sha256
+ (base32
+ ,(guix-hash-url temp)))))
+ (build-system python-build-system)
+ ,@(maybe-inputs 'inputs
+ (compute-inputs source-url temp))
+ (home-page ,home-page)
+ (synopsis ,synopsis)
+ (description ,description)
+ (license ,(assoc-ref `((,lgpl2.0 . lgpl2.0)
+ (,gpl3 . gpl3)
+ (,bsd-3 . bsd-3)
+ (,expat . expat)
+ (,public-domain . public-domain)
+ (,asl2.0 . asl2.0))
+ license)))))))
(define (pypi->guix-package package-name)
"Fetch the metadata for PACKAGE-NAME from pypi.python.org, and return the
--
1.8.4.rc3
