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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix scripts describe)
#:use-module ((guix ui) #:hide (display-profile-content))
#:use-module (guix scripts)
#:use-module (guix describe)
#:use-module (guix profiles)
#:use-module ((guix scripts pull) #:select (display-profile-content))
#:use-module (git)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-37)
#:use-module (ice-9 match)
#:autoload (ice-9 pretty-print) (pretty-print)
#:export (guix-describe))
;;;
;;; Command-line options.
;;;
(define %options
;; Specifications of the command-line options.
(list (option '(#\f "format") #t #f
(lambda (opt name arg result)
(unless (member arg '("human" "channels"))
(leave (G_ "~a: unsupported output format~%") arg))
(alist-cons 'format (string->symbol arg) result)))
(option '(#\p "profile") #t #f
(lambda (opt name arg result)
(alist-cons 'profile (canonicalize-profile arg)
result)))
(option '(#\h "help") #f #f
(lambda args
(show-help)
(exit 0)))
(option '(#\V "version") #f #f
(lambda args
(show-version-and-exit "guix describe")))))
(define %default-options
;; Alist of default option values.
'((format . human)))
(define (show-help)
(display (G_ "Usage: guix describe [OPTION]...
Display information about the channels currently in use.\n"))
(display (G_ "
-f, --format=FORMAT display information in the given FORMAT"))
(display (G_ "
-p, --profile=PROFILE display information about PROFILE"))
(newline)
(display (G_ "
-h, --help display this help and exit"))
(display (G_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
(define (display-package-search-path fmt)
"Display GUIX_PACKAGE_PATH, if it is set, according to FMT."
(match (getenv "GUIX_PACKAGE_PATH")
(#f #t)
(string
(match fmt
('human
(format #t "~%GUIX_PACKAGE_PATH=\"~a\"~%" string))
('channels
(format #t (G_ "~%;; warning: GUIX_PACKAGE_PATH=\"~a\"~%")
string))))))
(define* (display-checkout-info fmt #:optional directory)
"Display information about the current checkout according to FMT, a symbol
denoting the requested format. Exit if the current directory does not lie
within a Git checkout."
(let* ((program (or directory (car (command-line))))
(directory (catch 'git-error
(lambda ()
(repository-discover (dirname program)))
(lambda (key err)
(leave (G_ "failed to determine origin~%")))))
(repository (repository-open directory))
(head (repository-head repository))
(commit (oid->string (reference-target head))))
(match fmt
('human
(format #t (G_ "Git checkout:~%"))
(format #t (G_ " repository: ~a~%") (dirname directory))
(format #t (G_ " branch: ~a~%") (reference-shorthand head))
(format #t (G_ " commit: ~a~%") commit))
('channels
(pretty-print `(list (channel
(name 'guix)
(url ,(dirname directory))
(commit ,commit))))))
(display-package-search-path fmt)))
(define (display-profile-info profile fmt)
"Display information about PROFILE, a profile as created by (guix channels),
in the format specified by FMT."
(define number
(generation-number profile))
(match fmt
('human
(display-profile-content profile number))
('channels
(pretty-print
`(list ,@(map (lambda (entry)
(match (assq 'source (manifest-entry-properties entry))
(('source ('repository ('version 0)
('url url)
('branch branch)
('commit commit)
_ ...))
`(channel (name ',(string->symbol
(manifest-entry-name entry)))
(url ,url)
(commit ,commit)))
;; Pre-0.15.0 Guix does not provide that information,
;; so there's not much we can do in that case.
(_ '???)))
;; Show most recently installed packages last.
(reverse
(manifest-entries
(profile-manifest
(if (zero? number)
profile
(generation-file-name profile number))))))))))
(display-package-search-path fmt))
;;;
;;; Entry point.
;;;
(define (guix-describe . args)
(let* ((opts (args-fold* args %options
(lambda (opt name arg result)
(leave (G_ "~A: unrecognized option~%")
name))
cons
%default-options))
(format (assq-ref opts 'format))
(profile (or (assq-ref opts 'profile) (current-profile))))
(with-error-handling
(match profile
(#f
(display-checkout-info format))
(profile
(display-profile-info (canonicalize-profile profile) format))))))
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