249 lines
8 KiB
Scheme
249 lines
8 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014 Free Software Foundation, Inc.
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;;; Copyright © 2018 Sahithi Yarlagadda <sahi@swecha.net>
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;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
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;;; Copyright © 2017, 2018, 2019, 2022 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 colors)
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#:use-module (guix memoization)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-9 gnu)
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#:use-module (ice-9 match)
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#:use-module (ice-9 regex)
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#:autoload (web uri) (encode-and-join-uri-path)
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#:export (color
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color?
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coloring-procedure
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colorize-string
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highlight
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highlight/warn
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dim
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colorize-full-matches
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color-rules
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color-output?
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isatty?*
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supports-hyperlinks?
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file-hyperlink
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hyperlink))
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;;; Commentary:
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;;;
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;;; This module provides tools to produce colored output using ANSI escapes.
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;;;
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;;; Code:
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;; Record type for "colors", which are actually lists of color attributes.
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(define-record-type <color>
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(make-color symbols ansi)
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color?
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(symbols color-symbols)
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(ansi color-ansi))
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(define (print-color color port)
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(format port "#<color ~a>"
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(string-join (map symbol->string
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(color-symbols color)))))
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(set-record-type-printer! <color> print-color)
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(define-syntax define-color-table
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(syntax-rules ()
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"Define NAME as a macro that builds a list of color attributes."
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((_ name (color escape) ...)
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(begin
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(define-syntax color-codes
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(syntax-rules (color ...)
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((_)
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'())
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((_ color rest (... ...))
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`(escape ,@(color-codes rest (... ...))))
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...))
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(define-syntax-rule (name colors (... ...))
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"Return a list of color attributes that can be passed to
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'colorize-string'."
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(make-color '(colors (... ...))
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(color-codes->ansi (color-codes colors (... ...)))))))))
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(define-color-table color
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(CLEAR "0")
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(RESET "0")
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(BOLD "1")
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(DARK "2")
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(UNDERLINE "4")
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(UNDERSCORE "4")
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(BLINK "5")
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(REVERSE "6")
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(CONCEALED "8")
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(BLACK "30")
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(RED "31")
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(GREEN "32")
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(YELLOW "33")
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(BLUE "34")
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(MAGENTA "35")
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(CYAN "36")
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(WHITE "37")
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(ON-BLACK "40")
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(ON-RED "41")
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(ON-GREEN "42")
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(ON-YELLOW "43")
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(ON-BLUE "44")
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(ON-MAGENTA "45")
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(ON-CYAN "46")
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(ON-WHITE "47"))
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(define (color-codes->ansi codes)
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"Convert CODES, a list of color attribute codes, to a ANSI escape string."
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(match codes
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(()
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"")
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(_
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(string-append (string #\esc #\[)
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(string-join codes ";" 'infix)
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"m"))))
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(define %reset
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(color RESET))
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(define (colorize-string str color)
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"Return a copy of STR colorized using ANSI escape sequences according to
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COLOR. At the end of the returned string, the color attributes are reset such
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that subsequent output will not have any colors in effect."
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(string-append (color-ansi color)
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str
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(color-ansi %reset)))
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(define isatty?*
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(mlambdaq (port)
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"Return true if PORT is a tty. Memoize the result."
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(isatty? port)))
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(define (color-output? port)
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"Return true if we should write colored output to PORT."
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(and (not (getenv "NO_COLOR"))
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(isatty?* port)))
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(define (coloring-procedure color)
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"Return a procedure that applies COLOR to the given string."
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(lambda* (str #:optional (port (current-output-port)))
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"Return STR with extra ANSI color attributes if PORT supports it."
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(if (color-output? port)
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(colorize-string str color)
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str)))
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(define highlight (coloring-procedure (color BOLD)))
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(define highlight/warn (coloring-procedure (color BOLD MAGENTA)))
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(define dim (coloring-procedure (color DARK)))
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(define (colorize-full-matches rules)
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"Return a procedure that, given a string, colorizes according to RULES.
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RULES must be a list of regexp/color pairs; the whole match of a regexp is
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colorized with the corresponding color."
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(define proc
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(lambda (str)
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(if (string-index str #\nul)
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str
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(let loop ((rules rules))
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(match rules
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(()
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str)
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(((regexp . color) . rest)
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(match (regexp-exec regexp str)
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(#f (loop rest))
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(m (string-append (proc (match:prefix m))
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(colorize-string (match:substring m)
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color)
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(proc (match:suffix m)))))))))))
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proc)
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(define (colorize-matches rules)
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"Return a procedure that, when passed a string, returns that string
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colorized according to RULES. RULES must be a list of tuples like:
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(REGEXP COLOR1 COLOR2 ...)
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where COLOR1 specifies how to colorize the first submatch of REGEXP, and so
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on."
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(lambda (str)
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(if (string-index str #\nul)
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str
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(let loop ((rules rules))
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(match rules
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(()
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str)
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(((regexp . colors) . rest)
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(match (regexp-exec regexp str)
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(#f (loop rest))
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(m (let loop ((n 1)
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(colors colors)
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(result (list (match:prefix m))))
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(match colors
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(()
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(string-concatenate-reverse
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(cons (match:suffix m) result)))
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((first . tail)
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(loop (+ n 1)
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tail
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(cons (colorize-string (match:substring m n)
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first)
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result)))))))))))))
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(define-syntax color-rules
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(syntax-rules ()
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"Return a procedure that colorizes the string it is passed according to
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the given rules. Each rule has the form:
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(REGEXP COLOR1 COLOR2 ...)
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where COLOR1 specifies how to colorize the first submatch of REGEXP, and so
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on."
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((_ (regexp colors ...) ...)
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(colorize-matches `((,(make-regexp regexp) ,(color colors) ...)
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...)))))
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;;;
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;;; Hyperlinks.
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;;;
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(define (hyperlink uri text)
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"Return a string that denotes a hyperlink using an OSC escape sequence as
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documented at
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<https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda>."
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(string-append "\x1b]8;;" uri "\x1b\\"
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text "\x1b]8;;\x1b\\"))
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(define* (supports-hyperlinks? #:optional (port (current-output-port)))
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"Return true if PORT is a terminal that supports hyperlink escapes."
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;; Note that terminals are supposed to ignore OSC escapes they don't
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;; understand (this is the case of xterm as of version 349, for instance.)
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;; However, Emacs comint as of 26.3 does not ignore it and instead lets it
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;; through, hence the 'INSIDE_EMACS' special case below.
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(and (isatty?* port)
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(not (getenv "INSIDE_EMACS"))))
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(define* (file-hyperlink file #:optional (text file))
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"Return TEXT with escapes for a hyperlink to FILE."
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(hyperlink (string-append "file://" (gethostname)
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(encode-and-join-uri-path
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(string-split file #\/)))
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text))
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