3a09e1d2e8
Fixes <http://bugs.gnu.org/17468>. * guix/ui.scm (fill-paragraph): Two spaces after period and no spaces before newline. * tests/ui.scm: New test case. Signed-off-by: Ludovic Courtès <ludo@gnu.org>
695 lines
25 KiB
Scheme
695 lines
25 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2013 Mark H Weaver <mhw@netris.org>
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;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.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 ui)
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#:use-module (guix utils)
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#:use-module (guix store)
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#:use-module (guix config)
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#:use-module (guix packages)
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#:use-module (guix build-system)
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#:use-module (guix derivations)
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#:use-module ((guix licenses) #:select (license? license-name))
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-19)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:use-module (srfi srfi-37)
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#:autoload (ice-9 ftw) (scandir)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:use-module (ice-9 regex)
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#:export (_
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N_
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P_
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leave
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show-version-and-exit
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show-bug-report-information
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string->number*
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size->number
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show-what-to-build
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call-with-error-handling
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with-error-handling
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read/eval
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read/eval-package-expression
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location->string
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switch-symlinks
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config-directory
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fill-paragraph
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string->recutils
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package->recutils
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package-specification->name+version+output
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string->generations
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string->duration
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args-fold*
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run-guix-command
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program-name
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guix-warning-port
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warning
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guix-main))
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;;; Commentary:
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;;;
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;;; User interface facilities for command-line tools.
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;;;
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;;; Code:
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(define %gettext-domain
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;; Text domain for strings used in the tools.
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"guix")
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(define %package-text-domain
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;; Text domain for package synopses and descriptions.
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"guix-packages")
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(define _ (cut gettext <> %gettext-domain))
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(define N_ (cut ngettext <> <> <> %gettext-domain))
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(define P_ (cut gettext <> %package-text-domain))
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(define-syntax-rule (define-diagnostic name prefix)
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"Create a diagnostic macro (i.e., NAME), which will prepend PREFIX to all
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messages."
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(define-syntax name
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(lambda (x)
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(define (augmented-format-string fmt)
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(string-append "~:[~*~;guix ~a: ~]~a" (syntax->datum fmt)))
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(syntax-case x ()
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((name (underscore fmt) args (... ...))
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(and (string? (syntax->datum #'fmt))
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(free-identifier=? #'underscore #'_))
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(with-syntax ((fmt* (augmented-format-string #'fmt))
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(prefix (datum->syntax x prefix)))
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#'(format (guix-warning-port) (gettext fmt*)
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(program-name) (program-name) prefix
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args (... ...))))
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((name (N-underscore singular plural n) args (... ...))
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(and (string? (syntax->datum #'singular))
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(string? (syntax->datum #'plural))
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(free-identifier=? #'N-underscore #'N_))
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(with-syntax ((s (augmented-format-string #'singular))
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(p (augmented-format-string #'plural))
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(prefix (datum->syntax x prefix)))
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#'(format (guix-warning-port)
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(ngettext s p n %gettext-domain)
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(program-name) (program-name) prefix
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args (... ...))))))))
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(define-diagnostic warning "warning: ") ; emit a warning
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(define-diagnostic report-error "error: ")
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(define-syntax-rule (leave args ...)
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"Emit an error message and exit."
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(begin
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(report-error args ...)
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(exit 1)))
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(define (install-locale)
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"Install the current locale settings."
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(catch 'system-error
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(lambda _
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(setlocale LC_ALL ""))
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(lambda args
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(warning (_ "failed to install locale: ~a~%")
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(strerror (system-error-errno args))))))
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(define (initialize-guix)
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"Perform the usual initialization for stand-alone Guix commands."
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(install-locale)
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(textdomain %gettext-domain)
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;; Ignore SIGPIPE. If the daemon closes the connection, we prefer to be
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;; notified via an EPIPE later.
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(sigaction SIGPIPE SIG_IGN)
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(setvbuf (current-output-port) _IOLBF)
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(setvbuf (current-error-port) _IOLBF))
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(define* (show-version-and-exit #:optional (command (car (command-line))))
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"Display version information for COMMAND and `(exit 0)'."
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(simple-format #t "~a (~a) ~a~%"
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command %guix-package-name %guix-version)
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(display (_ "Copyright (C) 2014 the Guix authors
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law.
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"))
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(exit 0))
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(define (show-bug-report-information)
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(format #t (_ "
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Report bugs to: ~a.") %guix-bug-report-address)
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(format #t (_ "
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~a home page: <~a>") %guix-package-name %guix-home-page-url)
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(display (_ "
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General help using GNU software: <http://www.gnu.org/gethelp/>"))
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(newline))
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(define (string->number* str)
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"Like `string->number', but error out with an error message on failure."
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(or (string->number str)
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(leave (_ "~a: invalid number~%") str)))
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(define (size->number str)
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"Convert STR, a storage measurement representation such as \"1024\" or
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\"1MiB\", to a number of bytes. Raise an error if STR could not be
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interpreted."
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(define unit-pos
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(string-rindex str char-set:digit))
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(define unit
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(and unit-pos (substring str (+ 1 unit-pos))))
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(let* ((numstr (if unit-pos
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(substring str 0 (+ 1 unit-pos))
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str))
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(num (string->number numstr)))
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(unless num
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(leave (_ "invalid number: ~a~%") numstr))
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((compose inexact->exact round)
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(* num
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(match unit
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("KiB" (expt 2 10))
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("MiB" (expt 2 20))
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("GiB" (expt 2 30))
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("TiB" (expt 2 40))
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("KB" (expt 10 3))
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("MB" (expt 10 6))
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("GB" (expt 10 9))
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("TB" (expt 10 12))
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("" 1)
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(_
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(leave (_ "unknown unit: ~a~%") unit)))))))
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(define (call-with-error-handling thunk)
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"Call THUNK within a user-friendly error handler."
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(guard (c ((package-input-error? c)
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(let* ((package (package-error-package c))
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(input (package-error-invalid-input c))
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(location (package-location package))
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(file (location-file location))
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(line (location-line location))
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(column (location-column location)))
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(leave (_ "~a:~a:~a: package `~a' has an invalid input: ~s~%")
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file line column
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(package-full-name package) input)))
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((package-cross-build-system-error? c)
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(let* ((package (package-error-package c))
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(loc (package-location package))
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(system (package-build-system package)))
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(leave (_ "~a: ~a: build system `~a' does not support cross builds~%")
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(location->string loc)
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(package-full-name package)
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(build-system-name system))))
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((nix-connection-error? c)
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(leave (_ "failed to connect to `~a': ~a~%")
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(nix-connection-error-file c)
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(strerror (nix-connection-error-code c))))
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((nix-protocol-error? c)
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;; FIXME: Server-provided error messages aren't i18n'd.
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(leave (_ "build failed: ~a~%")
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(nix-protocol-error-message c)))
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((message-condition? c)
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;; Normally '&message' error conditions have an i18n'd message.
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(leave (_ "~a~%") (gettext (condition-message c)))))
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;; Catch EPIPE and the likes.
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(catch 'system-error
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thunk
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(lambda (key proc format-string format-args . rest)
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(leave (_ "~a: ~a~%") proc
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(apply format #f format-string format-args))))))
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(define %guix-user-module
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;; Module in which user expressions are evaluated.
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;; Compute lazily to avoid circularity with (guix gexp).
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(delay
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(let ((module (make-module)))
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(beautify-user-module! module)
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;; Use (guix gexp) so that one can use #~ & co.
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(module-use! module (resolve-interface '(guix gexp)))
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module)))
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(define (read/eval str)
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"Read and evaluate STR, raising an error if something goes wrong."
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(let ((exp (catch #t
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(lambda ()
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(call-with-input-string str read))
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(lambda args
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(leave (_ "failed to read expression ~s: ~s~%")
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str args)))))
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(catch #t
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(lambda ()
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(eval exp (force %guix-user-module)))
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(lambda args
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(leave (_ "failed to evaluate expression `~a': ~s~%")
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exp args)))))
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(define (read/eval-package-expression str)
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"Read and evaluate STR and return the package it refers to, or exit an
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error."
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(match (read/eval str)
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((? package? p) p)
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(_
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(leave (_ "expression ~s does not evaluate to a package~%")
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str))))
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(define* (show-what-to-build store drv
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#:key dry-run? (use-substitutes? #t))
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"Show what will or would (depending on DRY-RUN?) be built in realizing the
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derivations listed in DRV. Return #t if there's something to build, #f
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otherwise. When USE-SUBSTITUTES?, check and report what is prerequisites are
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available for download."
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(define (built-or-substitutable? drv)
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(let ((out (derivation->output-path drv)))
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;; If DRV has zero outputs, OUT is #f.
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(or (not out)
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(or (valid-path? store out)
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(and use-substitutes?
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(has-substitutes? store out))))))
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(let*-values (((build download)
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(fold2 (lambda (drv build download)
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(let-values (((b d)
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(derivation-prerequisites-to-build
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store drv
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#:use-substitutes?
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use-substitutes?)))
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(values (append b build)
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(append d download))))
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'() '()
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drv))
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((build) ; add the DRV themselves
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(delete-duplicates
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(append (map derivation-file-name
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(remove built-or-substitutable? drv))
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(map derivation-input-path build))))
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((download) ; add the references of DOWNLOAD
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(if use-substitutes?
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(delete-duplicates
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(append download
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(remove (cut valid-path? store <>)
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(append-map
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substitutable-references
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(substitutable-path-info store
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download)))))
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download)))
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;; TODO: Show the installed size of DOWNLOAD.
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(if dry-run?
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(begin
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(format (current-error-port)
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(N_ "~:[The following derivation would be built:~%~{ ~a~%~}~;~]"
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"~:[The following derivations would be built:~%~{ ~a~%~}~;~]"
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(length build))
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(null? build) build)
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(format (current-error-port)
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(N_ "~:[The following file would be downloaded:~%~{ ~a~%~}~;~]"
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"~:[The following files would be downloaded:~%~{ ~a~%~}~;~]"
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(length download))
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(null? download) download))
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(begin
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(format (current-error-port)
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(N_ "~:[The following derivation will be built:~%~{ ~a~%~}~;~]"
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"~:[The following derivations will be built:~%~{ ~a~%~}~;~]"
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(length build))
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(null? build) build)
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(format (current-error-port)
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(N_ "~:[The following file will be downloaded:~%~{ ~a~%~}~;~]"
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"~:[The following files will be downloaded:~%~{ ~a~%~}~;~]"
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(length download))
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(null? download) download)))
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(pair? build)))
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(define-syntax with-error-handling
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(syntax-rules ()
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"Run BODY within a user-friendly error condition handler."
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((_ body ...)
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(call-with-error-handling
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(lambda ()
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body ...)))))
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(define (location->string loc)
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"Return a human-friendly, GNU-standard representation of LOC."
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(match loc
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(#f (_ "<unknown location>"))
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(($ <location> file line column)
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(format #f "~a:~a:~a" file line column))))
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(define (switch-symlinks link target)
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"Atomically switch LINK, a symbolic link, to point to TARGET. Works
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both when LINK already exists and when it does not."
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(let ((pivot (string-append link ".new")))
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(symlink target pivot)
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(rename-file pivot link)))
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(define (config-directory)
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"Return the name of the configuration directory, after making sure that it
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exists. Honor the XDG specs,
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<http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html>."
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(let ((dir (and=> (or (getenv "XDG_CONFIG_HOME")
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(and=> (getenv "HOME")
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(cut string-append <> "/.config")))
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(cut string-append <> "/guix"))))
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(catch 'system-error
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(lambda ()
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(mkdir dir)
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dir)
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(lambda args
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(match (system-error-errno args)
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((or EEXIST 0)
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dir)
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(err
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(leave (_ "failed to create configuration directory `~a': ~a~%")
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dir (strerror err))))))))
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(define* (fill-paragraph str width #:optional (column 0))
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"Fill STR such that each line contains at most WIDTH characters, assuming
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that the first character is at COLUMN.
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When STR contains a single line break surrounded by other characters, it is
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converted to a space; sequences of more than one line break are preserved."
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(define (maybe-break chr result)
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(match result
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((column newlines chars)
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(case chr
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((#\newline)
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`(,column ,(+ 1 newlines) ,chars))
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(else
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(let* ((spaces (if (and (pair? chars) (eqv? (car chars) #\.)) 2 1))
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(chars (case newlines
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((0) chars)
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((1)
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(append (make-list spaces #\space) chars))
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(else
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(append (make-list newlines #\newline) chars))))
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(column (case newlines
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((0) column)
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((1) (+ spaces column))
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(else 0))))
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(let ((chars (cons chr chars))
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(column (+ 1 column)))
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(if (> column width)
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(let*-values (((before after)
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(break (cut eqv? #\space <>) chars))
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((len)
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(length before)))
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(if (<= len width)
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`(,len
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0
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,(if (null? after)
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before
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(append before
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(cons #\newline
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(drop-while (cut eqv? #\space <>)
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after)))))
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`(,column 0 ,chars))) ; unbreakable
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`(,column 0 ,chars)))))))))
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(match (string-fold maybe-break
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`(,column 0 ())
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str)
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((_ _ chars)
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(list->string (reverse chars)))))
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;;;
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;;; Packages.
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;;;
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(define (string->recutils str)
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"Return a version of STR where newlines have been replaced by newlines
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followed by \"+ \", which makes for a valid multi-line field value in the
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`recutils' syntax."
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(list->string
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(string-fold-right (lambda (chr result)
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(if (eqv? chr #\newline)
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(cons* chr #\+ #\space result)
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(cons chr result)))
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'()
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str)))
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(define* (package->recutils p port
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#:optional (width (or (and=> (getenv "WIDTH")
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string->number)
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80)))
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"Write to PORT a `recutils' record of package P, arranging to fit within
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WIDTH columns."
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(define (description->recutils str)
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(let ((str (P_ str)))
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(string->recutils
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(fill-paragraph str width
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(string-length "description: ")))))
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(define (dependencies->recutils packages)
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(let ((list (string-join (map package-full-name
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(sort packages package<?)) " ")))
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(string->recutils
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(fill-paragraph list width
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(string-length "dependencies: ")))))
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(define (package<? p1 p2)
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(string<? (package-full-name p1) (package-full-name p2)))
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;; Note: Don't i18n field names so that people can post-process it.
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(format port "name: ~a~%" (package-name p))
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(format port "version: ~a~%" (package-version p))
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(format port "dependencies: ~a~%"
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(match (package-direct-inputs p)
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(((labels inputs . _) ...)
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(dependencies->recutils (filter package? inputs)))))
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(format port "location: ~a~%"
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(or (and=> (package-location p) location->string)
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(_ "unknown")))
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;; Note: Starting from version 1.6 or recutils, hyphens are not allowed in
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;; field identifiers.
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(format port "homepage: ~a~%" (package-home-page p))
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(format port "license: ~a~%"
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(match (package-license p)
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(((? license? licenses) ...)
|
||
(string-join (map license-name licenses)
|
||
", "))
|
||
((? license? license)
|
||
(license-name license))
|
||
(x
|
||
(_ "unknown"))))
|
||
(format port "synopsis: ~a~%"
|
||
(string-map (match-lambda
|
||
(#\newline #\space)
|
||
(chr chr))
|
||
(or (and=> (package-synopsis p) P_)
|
||
"")))
|
||
(format port "description: ~a~%"
|
||
(and=> (package-description p) description->recutils))
|
||
(newline port))
|
||
|
||
(define (string->generations str)
|
||
"Return the list of generations matching a pattern in STR. This function
|
||
accepts the following patterns: \"1\", \"1,2,3\", \"1..9\", \"1..\", \"..9\"."
|
||
(define (maybe-integer)
|
||
(let ((x (string->number str)))
|
||
(and (integer? x)
|
||
x)))
|
||
|
||
(define (maybe-comma-separated-integers)
|
||
(let ((lst (delete-duplicates
|
||
(map string->number
|
||
(string-split str #\,)))))
|
||
(and (every integer? lst)
|
||
lst)))
|
||
|
||
(cond ((maybe-integer)
|
||
=>
|
||
list)
|
||
((maybe-comma-separated-integers)
|
||
=>
|
||
identity)
|
||
((string-match "^([0-9]+)\\.\\.([0-9]+)$" str)
|
||
=>
|
||
(lambda (match)
|
||
(let ((s (string->number (match:substring match 1)))
|
||
(e (string->number (match:substring match 2))))
|
||
(and (every integer? (list s e))
|
||
(<= s e)
|
||
(iota (1+ (- e s)) s)))))
|
||
((string-match "^([0-9]+)\\.\\.$" str)
|
||
=>
|
||
(lambda (match)
|
||
(let ((s (string->number (match:substring match 1))))
|
||
(and (integer? s)
|
||
`(>= ,s)))))
|
||
((string-match "^\\.\\.([0-9]+)$" str)
|
||
=>
|
||
(lambda (match)
|
||
(let ((e (string->number (match:substring match 1))))
|
||
(and (integer? e)
|
||
`(<= ,e)))))
|
||
(else #f)))
|
||
|
||
(define (string->duration str)
|
||
"Return the duration matching a pattern in STR. This function accepts the
|
||
following patterns: \"1d\", \"1w\", \"1m\"."
|
||
(define (hours->duration hours match)
|
||
(make-time time-duration 0
|
||
(* 3600 hours (string->number (match:substring match 1)))))
|
||
|
||
(cond ((string-match "^([0-9]+)d$" str)
|
||
=>
|
||
(lambda (match)
|
||
(hours->duration 24 match)))
|
||
((string-match "^([0-9]+)w$" str)
|
||
=>
|
||
(lambda (match)
|
||
(hours->duration (* 24 7) match)))
|
||
((string-match "^([0-9]+)m$" str)
|
||
=>
|
||
(lambda (match)
|
||
(hours->duration (* 24 30) match)))
|
||
(else #f)))
|
||
|
||
(define* (package-specification->name+version+output spec
|
||
#:optional (output "out"))
|
||
"Parse package specification SPEC and return three value: the specified
|
||
package name, version number (or #f), and output name (or OUTPUT). SPEC may
|
||
optionally contain a version number and an output name, as in these examples:
|
||
|
||
guile
|
||
guile-2.0.9
|
||
guile:debug
|
||
guile-2.0.9:debug
|
||
"
|
||
(let*-values (((name sub-drv)
|
||
(match (string-rindex spec #\:)
|
||
(#f (values spec output))
|
||
(colon (values (substring spec 0 colon)
|
||
(substring spec (+ 1 colon))))))
|
||
((name version)
|
||
(package-name->name+version name)))
|
||
(values name version sub-drv)))
|
||
|
||
|
||
;;;
|
||
;;; Command-line option processing.
|
||
;;;
|
||
|
||
(define (args-fold* options unrecognized-option-proc operand-proc . seeds)
|
||
"A wrapper on top of `args-fold' that does proper user-facing error
|
||
reporting."
|
||
(catch 'misc-error
|
||
(lambda ()
|
||
(apply args-fold options unrecognized-option-proc
|
||
operand-proc seeds))
|
||
(lambda (key proc msg args . rest)
|
||
;; XXX: MSG is not i18n'd.
|
||
(leave (_ "invalid argument: ~a~%")
|
||
(apply format #f msg args)))))
|
||
|
||
(define (show-guix-usage)
|
||
(format (current-error-port)
|
||
(_ "Try `guix --help' for more information.~%"))
|
||
(exit 1))
|
||
|
||
(define (command-files)
|
||
"Return the list of source files that define Guix sub-commands."
|
||
(define directory
|
||
(and=> (search-path %load-path "guix.scm")
|
||
(compose (cut string-append <> "/guix/scripts")
|
||
dirname)))
|
||
|
||
(define dot-scm?
|
||
(cut string-suffix? ".scm" <>))
|
||
|
||
;; In Guile 2.0.5 `scandir' would return "." and ".." regardless even though
|
||
;; they don't match `dot-scm?'. Work around it by doing additional
|
||
;; filtering.
|
||
(if directory
|
||
(filter dot-scm? (scandir directory dot-scm?))
|
||
'()))
|
||
|
||
(define (commands)
|
||
"Return the list of Guix command names."
|
||
(map (compose (cut string-drop-right <> 4)
|
||
basename)
|
||
(command-files)))
|
||
|
||
(define (show-guix-help)
|
||
(define (internal? command)
|
||
(member command '("substitute-binary" "authenticate" "offload")))
|
||
|
||
(format #t (_ "Usage: guix COMMAND ARGS...
|
||
Run COMMAND with ARGS.\n"))
|
||
(newline)
|
||
(format #t (_ "COMMAND must be one of the sub-commands listed below:\n"))
|
||
(newline)
|
||
;; TODO: Display a synopsis of each command.
|
||
(format #t "~{ ~a~%~}" (sort (remove internal? (commands))
|
||
string<?))
|
||
(show-bug-report-information))
|
||
|
||
(define program-name
|
||
;; Name of the command-line program currently executing, or #f.
|
||
(make-parameter #f))
|
||
|
||
(define (run-guix-command command . args)
|
||
"Run COMMAND with the given ARGS. Report an error when COMMAND is not
|
||
found."
|
||
(define module
|
||
(catch 'misc-error
|
||
(lambda ()
|
||
(resolve-interface `(guix scripts ,command)))
|
||
(lambda -
|
||
(format (current-error-port)
|
||
(_ "guix: ~a: command not found~%") command)
|
||
(show-guix-usage))))
|
||
|
||
(let ((command-main (module-ref module
|
||
(symbol-append 'guix- command))))
|
||
(parameterize ((program-name command))
|
||
(apply command-main args))))
|
||
|
||
(define guix-warning-port
|
||
(make-parameter (current-warning-port)))
|
||
|
||
(define (guix-main arg0 . args)
|
||
(initialize-guix)
|
||
(let ()
|
||
(define (option? str) (string-prefix? "-" str))
|
||
(match args
|
||
(()
|
||
(format (current-error-port)
|
||
(_ "guix: missing command name~%"))
|
||
(show-guix-usage))
|
||
((or ("-h") ("--help"))
|
||
(show-guix-help))
|
||
(("--version")
|
||
(show-version-and-exit "guix"))
|
||
(((? option? o) args ...)
|
||
(format (current-error-port)
|
||
(_ "guix: unrecognized option '~a'~%") o)
|
||
(show-guix-usage))
|
||
((command args ...)
|
||
(apply run-guix-command
|
||
(string->symbol command)
|
||
args)))))
|
||
|
||
;;; ui.scm ends here
|