@@ -1,4 +1,5 @@
/* SPDX-License-Identifier: GPL-2.0 */
+#include <stdbool.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
@@ -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);
@@ -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.
Implement fine-grained control over color codes for iproute, very similar to the GCC_COLORS environment variable. Signed-off-by: Jan Engelhardt <jengelh@inai.de> --- lib/color.c | 127 ++++++++++++++++++++++++-------------------------- man/man8/ip.8 | 25 ++++++++-- 2 files changed, 81 insertions(+), 71 deletions(-)