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Support simple 8 bit ansi escape sequences

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See https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit
Support standard and high intensity colors. The default
ncurses colors ARE the high intensity colors - represented
via an 8 bit ansi escape sequence here.
This commit is contained in:
Nipunn Koorapati 2020-07-02 06:05:24 +00:00 committed by Craig Small
parent e2470edc8c
commit 486a3e30e1
1 changed files with 51 additions and 10 deletions
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61
watch.c
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@ -137,7 +137,31 @@ static void init_ansi_colors(void)
}
static int set_ansi_attribute(const int attrib)
static int color_escape_sequence(char* escape_sequence) {
int num;
if (escape_sequence[0] != ';')
return 0; /* not understood */
if (escape_sequence[1] == '5') {
// 8 bit!
if (escape_sequence[2] != ';')
return 0; /* not understood */
num = strtol(escape_sequence + 3, NULL, 10);
if (num >= 0 && num <= 7) {
// Low intensity colors. Show them as high intensity for
// simplicity of implementation.
return num + 1;
} else if (num >= 8 && num <= 15) {
return num - 8 + 1;
}
}
return 0; /* not understood */
}
static int set_ansi_attribute(const int attrib, char* escape_sequence)
{
switch (attrib) {
case -1: /* restore last settings */
@ -185,12 +209,27 @@ static int set_ansi_attribute(const int attrib)
case 27: /* unset inversed */
attributes &= ~A_REVERSE;
break;
case 38:
fg_col = color_escape_sequence(escape_sequence);
if (fg_col == 0) {
return 0; /* not understood */
}
break;
case 39:
fg_col = 0;
break;
case 48:
bg_col = color_escape_sequence(escape_sequence);
if (bg_col == 0) {
return 0; /* not understood */
}
break;
case 49:
bg_col = 0;
break;
case 49:
bg_col = 0;
break;
default:
if (attrib >= 30 && attrib <= 37) { /* set foreground color */
fg_col = attrib - 30 + 1;
@ -207,6 +246,7 @@ static int set_ansi_attribute(const int attrib)
static void process_ansi(FILE * fp)
{
int i, c;
int ansi_attribute;
char buf[MAX_ANSIBUF];
char *numstart, *endptr;
@ -235,14 +275,15 @@ static void process_ansi(FILE * fp)
* attributes to apply, but typically there are between 1 and 3.
*/
/* Special case of <ESC>[m */
if (buf[0] == '\0')
set_ansi_attribute(0);
/* Special case of <ESC>[m */
if (buf[0] == '\0')
set_ansi_attribute(0, NULL);
for (endptr = numstart = buf; *endptr != '\0'; numstart = endptr + 1) {
if (!set_ansi_attribute(strtol(numstart, &endptr, 10)))
break;
}
for (endptr = numstart = buf; *endptr != '\0'; numstart = endptr + 1) {
ansi_attribute = strtol(numstart, &endptr, 10);
if (!set_ansi_attribute(ansi_attribute, endptr))
break;
}
}
static void __attribute__ ((__noreturn__)) do_exit(int status)
@ -522,7 +563,7 @@ static int run_command(char *restrict command, char **restrict command_argv)
for (y = show_title; y < height; y++) {
int eolseen = 0, tabpending = 0, tabwaspending = 0;
if (flags & WATCH_COLOR)
set_ansi_attribute(-1);
set_ansi_attribute(-1, NULL);
#ifdef WITH_WATCH8BIT
wint_t carry = WEOF;
#endif
@ -535,7 +576,7 @@ static int run_command(char *restrict command, char **restrict command_argv)
int attr = 0;
if (tabwaspending && (flags & WATCH_COLOR))
set_ansi_attribute(-1);
set_ansi_attribute(-1, NULL);
tabwaspending = 0;
if (!eolseen) {