From patchwork Mon Oct 12 14:50:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Engelhardt X-Patchwork-Id: 11833073 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 538F7C433E7 for ; Mon, 12 Oct 2020 14:50:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0D6F620838 for ; Mon, 12 Oct 2020 14:50:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389162AbgJLOuY (ORCPT ); Mon, 12 Oct 2020 10:50:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41920 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388863AbgJLOuY (ORCPT ); Mon, 12 Oct 2020 10:50:24 -0400 Received: from a3.inai.de (a3.inai.de [IPv6:2a01:4f8:10b:45d8::f5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4CE3EC0613D0 for ; Mon, 12 Oct 2020 07:50:24 -0700 (PDT) Received: by a3.inai.de (Postfix, from userid 65534) id BBC14586342E1; Mon, 12 Oct 2020 16:50:22 +0200 (CEST) Received: from a4.inai.de (a4.inai.de [IPv6:2a01:4f8:10b:45d8::f8]) by a3.inai.de (Postfix) with ESMTP id 816CB5872C948; Mon, 12 Oct 2020 16:50:21 +0200 (CEST) From: Jan Engelhardt To: stephen@networkplumber.org Cc: jengelh@inai.de, netdev@vger.kernel.org Subject: [iproute PATCH] lib/color: introduce freely configurable color strings Date: Mon, 12 Oct 2020 16:50:21 +0200 Message-Id: <20201012145021.10539-1-jengelh@inai.de> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Implement fine-grained control over color codes for iproute, very similar to the GCC_COLORS environment variable. Signed-off-by: Jan Engelhardt --- lib/color.c | 127 ++++++++++++++++++++++++-------------------------- man/man8/ip.8 | 25 ++++++++-- 2 files changed, 81 insertions(+), 71 deletions(-) diff --git a/lib/color.c b/lib/color.c index 59976847..a11129f4 100644 --- a/lib/color.c +++ b/lib/color.c @@ -1,4 +1,5 @@ /* SPDX-License-Identifier: GPL-2.0 */ +#include #include #include #include @@ -13,71 +14,37 @@ static void set_color_palette(void); -enum color { - C_RED, - C_GREEN, - C_YELLOW, - C_BLUE, - C_MAGENTA, - C_CYAN, - C_WHITE, - C_BOLD_RED, - C_BOLD_GREEN, - C_BOLD_YELLOW, - C_BOLD_BLUE, - C_BOLD_MAGENTA, - C_BOLD_CYAN, - C_BOLD_WHITE, - C_CLEAR -}; - -static const char * const color_codes[] = { - "\e[31m", - "\e[32m", - "\e[33m", - "\e[34m", - "\e[35m", - "\e[36m", - "\e[37m", - "\e[1;31m", - "\e[1;32m", - "\e[1;33m", - "\e[1;34m", - "\e[1;35m", - "\e[1;36m", - "\e[1;37m", - "\e[0m", - NULL, -}; - -/* light background */ -static enum color attr_colors_light[] = { - C_CYAN, - C_YELLOW, - C_MAGENTA, - C_BLUE, - C_GREEN, - C_RED, +enum { + C_IFACE, + C_LLADDR, + C_V4ADDR, + C_V6ADDR, + C_OPERUP, + C_OPERDN, C_CLEAR, + C_MAX, }; -/* dark background */ -static enum color attr_colors_dark[] = { - C_BOLD_CYAN, - C_BOLD_YELLOW, - C_BOLD_MAGENTA, - C_BOLD_BLUE, - C_BOLD_GREEN, - C_BOLD_RED, - C_CLEAR +static const char default_colors_for_black[] = + "iface=36:lladdr=33:v4addr=35:v6addr=34:operup=32:operdn=31:clear=0"; +static const char default_colors_for_white[] = + "iface=1;36:lladdr=1;33:v4addr=1;35:v6addr=1;34:operup=1;32:operdn=1;31:clear=0"; +static struct color_code { + const char match[8], *code; + int len; +} color_codes[C_MAX] = { + {"iface="}, {"lladdr="}, {"v4addr="}, {"v6addr="}, {"operup="}, + {"operdn="}, {"clear=", "0", 1}, }; -static int is_dark_bg; static int color_is_enabled; static void enable_color(void) { - color_is_enabled = 1; + /* Without $TERM analysis by terminfo, the next best option is...: */ + const char *s = getenv("COLORTERM"), *s2 = getenv("COLORFGBG"); + color_is_enabled = (s != NULL && strtoul(s, NULL, 0) != 0) || + (s2 != NULL && *s2 != '\0'); set_color_palette(); } @@ -121,17 +88,43 @@ bool matches_color(const char *arg, int *val) static void set_color_palette(void) { - char *p = getenv("COLORFGBG"); + const char *initstr = default_colors_for_black; + const char *p = getenv("COLORFGBG"); /* * COLORFGBG environment variable usually contains either two or three * values separated by semicolons; we want the last value in either case. - * If this value is 0-6 or 8, background is dark. + * If this value is 7, background is bright. */ - if (p && (p = strrchr(p, ';')) != NULL - && ((p[1] >= '0' && p[1] <= '6') || p[1] == '8') - && p[2] == '\0') - is_dark_bg = 1; + if (p && (p = strrchr(p, ';')) != NULL && (p[1] == '7' && p[2] == '\0')) + initstr = default_colors_for_white; + p = getenv("IPROUTE_COLORS"); + if (p != NULL) + initstr = p; + + for (p = initstr; *p != '\0'; ) { + unsigned int key = C_MAX; + const char *code = NULL; + for (size_t j = 0; j < ARRAY_SIZE(color_codes); ++j) { + if (strncmp(p, color_codes[j].match, + strlen(color_codes[j].match)) != 0) + continue; + key = j; + code = p + strlen(color_codes[j].match); + break; + } + + const char *next = strchr(p, ':'); + if (next == NULL) + next = p + strlen(p); + if (key != C_MAX) { + color_codes[key].code = code; + color_codes[key].len = next - code; + } + p = next; + if (*next != '\0') + ++p; + } } __attribute__((format(printf, 3, 4))) @@ -147,11 +140,13 @@ int color_fprintf(FILE *fp, enum color_attr attr, const char *fmt, ...) goto end; } - ret += fprintf(fp, "%s", color_codes[is_dark_bg ? - attr_colors_dark[attr] : attr_colors_light[attr]]); - + const struct color_code *k = &color_codes[attr]; + if (k->code != NULL && *k->code != '\0') + ret += fprintf(fp, "\e[%.*sm", k->len, k->code); ret += vfprintf(fp, fmt, args); - ret += fprintf(fp, "%s", color_codes[C_CLEAR]); + k = &color_codes[C_CLEAR]; + if (k->code != NULL && *k->code != '\0') + ret += fprintf(fp, "\e[%.*sm", k->len, k->code); end: va_end(args); diff --git a/man/man8/ip.8 b/man/man8/ip.8 index c9f7671e..90efeadf 100644 --- a/man/man8/ip.8 +++ b/man/man8/ip.8 @@ -199,8 +199,7 @@ precedence. This flag is ignored if .B \-json is also given. -Used color palette can be influenced by -.BR COLORFGBG +The used color palette can be influenced by the \fBIPROUTE_COLORS\fP environment variable (see .BR ENVIRONMENT ). @@ -359,15 +358,31 @@ or, if the objects of this class cannot be listed, .SH ENVIRONMENT .TP .B COLORFGBG -If set, it's value is used for detection whether background is dark or -light and use contrast colors for it. +If set, its value is used to detect whether the background is dark or +light and to select a different palette for IPROUTE_COLORS. -COLORFGBG environment variable usually contains either two or three +The COLORFGBG environment variable usually contains either two or three values separated by semicolons; we want the last value in either case. If this value is 0-6 or 8, chose colors suitable for dark background: COLORFGBG=";0" ip -c a +.TP +\fBCOLORTERM\fP +If set, its value is used to determine whether to enable color when +--color=auto is in effect. iproute does not otherwise make use of terminfo and +as such does not evaluate the TERM environment variable. +.TP +\fBIPROUTE_COLORS\fP +Its value is a colon-separated list of capabilities and Select Graphic +Rendition (SGR) substrings. SGR commands are interpreted by the terminal or +terminal emulator. (See the section in the documentation of your text terminal +for permitted values and their meanings as character attributes. The +console_codes(4) manpage gives an overview of ECMA codes.) These substring +values are integers in decimal representation and can be concatenated with +semicolons. +Default: +\fIiface=36:lladdr=33:v4addr=35:v6addr=34:operup=32:operdn=31:clear=0\fP .SH EXIT STATUS Exit status is 0 if command was successful, and 1 if there is a syntax error. If an error was reported by the kernel exit status is 2.