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| author | Sahithi Yarlagadda <sahi@swecha.net> | 2018-09-04 17:32:26 +0200 |
|---|---|---|
| committer | Ricardo Wurmus <rekado@elephly.net> | 2018-09-09 22:26:54 +0200 |
| commit | 80ec1b73d2ca9745ea3b056bbfcecf3c33a4de5f (patch) | |
| tree | ee9a9943e0b64bee645371cebe9c0736f4b55053 | |
| parent | 45350539aa2c977ae04bfda0483834a2bd638fb3 (diff) | |
| download | guix-80ec1b73d2ca9745ea3b056bbfcecf3c33a4de5f.tar guix-80ec1b73d2ca9745ea3b056bbfcecf3c33a4de5f.tar.gz | |
ui: Add support for colorization.
* guix/ui.scm (ansi-color-tables): New variable.
(color, colorize-string): New procedures.
Signed-off-by: Ricardo Wurmus <rekado@elephly.net>
| -rw-r--r-- | guix/ui.scm | 55 |
1 files changed, 54 insertions, 1 deletions
diff --git a/guix/ui.scm b/guix/ui.scm index 29c0b2b9ce..f8f2cad69f 100644 --- a/guix/ui.scm +++ b/guix/ui.scm @@ -10,6 +10,8 @@ ;;; Copyright © 2016 Roel Janssen <roel@gnu.org> ;;; Copyright © 2016 Benz Schenk <benz.schenk@uzh.ch> ;;; Copyright © 2018 Kyle Meyer <kyle@kyleam.com> +;;; Copyright © 2013, 2014 Free Software Foundation, Inc. +;;; Copyright © 2018 Sahithi Yarlagadda <sahi@swecha.net> ;;; ;;; This file is part of GNU Guix. ;;; @@ -115,7 +117,8 @@ guix-warning-port warning info - guix-main)) + guix-main + colorize-string)) ;;; Commentary: ;;; @@ -1622,4 +1625,54 @@ and signal handling has already been set up." (initialize-guix) (apply run-guix args)) +(define color-table + `((CLEAR . "0") + (RESET . "0") + (BOLD . "1") + (DARK . "2") + (UNDERLINE . "4") + (UNDERSCORE . "4") + (BLINK . "5") + (REVERSE . "6") + (CONCEALED . "8") + (BLACK . "30") + (RED . "31") + (GREEN . "32") + (YELLOW . "33") + (BLUE . "34") + (MAGENTA . "35") + (CYAN . "36") + (WHITE . "37") + (ON-BLACK . "40") + (ON-RED . "41") + (ON-GREEN . "42") + (ON-YELLOW . "43") + (ON-BLUE . "44") + (ON-MAGENTA . "45") + (ON-CYAN . "46") + (ON-WHITE . "47"))) + +(define (color . lst) + "Return a string containing the ANSI escape sequence for producing the +requested set of attributes in LST. Unknown attributes are ignored." + (let ((color-list + (remove not + (map (lambda (color) (assq-ref color-table color)) + lst)))) + (if (null? color-list) + "" + (string-append + (string #\esc #\[) + (string-join color-list ";" 'infix) + "m")))) + +(define (colorize-string str . color-list) + "Return a copy of STR colorized using ANSI escape sequences according to the +attributes STR. At the end of the returned string, the color attributes will +be reset such that subsequent output will not have any colors in effect." + (string-append + (apply color color-list) + str + (color 'RESET))) + ;;; ui.scm ends here |