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Supporting bright colors with ncurses

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This commit is contained in:
Nipunn Koorapati 2020-07-13 02:08:26 +00:00 committed by Craig Small
parent 7c64daa095
commit 418631d7f3
1 changed files with 60 additions and 29 deletions
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89
watch.c
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@ -113,6 +113,7 @@ static int nr_of_colors;
static int attributes;
static int fg_col;
static int bg_col;
static int more_colors;
static void reset_ansi(void)
@ -124,51 +125,77 @@ static void reset_ansi(void)
static void init_ansi_colors(void)
{
int color;
short ncurses_colors[] = {
-1, COLOR_BLACK, COLOR_RED, COLOR_GREEN, COLOR_YELLOW,
COLOR_BLUE, COLOR_MAGENTA, COLOR_CYAN, COLOR_WHITE
};
nr_of_colors = sizeof(ncurses_colors) / sizeof(short);
more_colors = (COLORS >= 16) && (COLOR_PAIRS >= 16 * 16);
// Initialize ncurses colors. -1 is terminal default
// 0-7 are auto created standard colors initialized by ncurses
if (more_colors) {
// Initialize using ANSI SGR 8-bit specified colors
// 8-15 are bright colors
init_color(8, 333, 333, 333); // Bright black
init_color(9, 1000, 333, 333); // Bright red
init_color(10, 333, 1000, 333); // Bright green
init_color(11, 1000, 1000, 333); // Bright yellow
init_color(12, 333, 333, 1000); // Bright blue
init_color(13, 1000, 333, 1000); // Bright magenta
init_color(14, 333, 1000, 1000); // Bright cyan
// Often ncurses is built with only 256 colors, so lets
// stop here - so we can support the -1 terminal default
//init_color(15, 1000, 1000, 1000); // Bright white
nr_of_colors += 7;
}
// Initialize all color pairs with ncurses
for (bg_col = 0; bg_col < nr_of_colors; bg_col++)
for (fg_col = 0; fg_col < nr_of_colors; fg_col++)
init_pair(bg_col * nr_of_colors + fg_col + 1, ncurses_colors[fg_col], ncurses_colors[bg_col]);
init_pair(bg_col * nr_of_colors + fg_col + 1, fg_col - 1, bg_col - 1);
reset_ansi();
}
static int process_ansi_color_escape_sequence(char** escape_sequence) {
// process SGR ANSI color escape sequence
// Eg 8-bit
// 38;5;⟨n⟩ (set fg color to n)
// 48;5;⟨n⟩ (set bg color to n)
//
// Eg 24-bit (not yet implemented)
// ESC[ 38;2;⟨r⟩;⟨g⟩;⟨b⟩ m Select RGB foreground color
// ESC[ 48;2;⟨r⟩;⟨g⟩;⟨b⟩ m Select RGB background color
int num;
// process SGR ANSI color escape sequence
// Eg 8-bit
// 38;5;⟨n⟩ (set fg color to n)
// 48;5;⟨n⟩ (set bg color to n)
//
// Eg 24-bit (not yet implemented)
// ESC[ 38;2;⟨r⟩;⟨g⟩;⟨b⟩ m Select RGB foreground color
// ESC[ 48;2;⟨r⟩;⟨g⟩;⟨b⟩ m Select RGB background color
int num;
if ((*escape_sequence)[0] != ';')
return 0; /* not understood */
if ((*escape_sequence)[0] != ';')
return 0; /* not understood */
if ((*escape_sequence)[1] == '5') {
// 8 bit! ANSI specifies a predefined set of 256 colors here.
if ((*escape_sequence)[2] != ';')
return 0; /* not understood */
num = strtol((*escape_sequence) + 3, escape_sequence, 10);
if (num >= 0 && num <= 7) {
// 0-7 are standard colors same as SGR 30-37
return num + 1;
}
if ((*escape_sequence)[1] == '5') {
// 8 bit! ANSI specifies a predefined set of 256 colors here.
if ((*escape_sequence)[2] != ';')
return 0; /* not understood */
num = strtol((*escape_sequence) + 3, escape_sequence, 10);
if (num >= 0 && num <= 7) {
// 0-7 are standard colors same as SGR 30-37
return num + 1;
}
if (num >= 8 && num <= 15) {
// 8-15 are standard colors same as SGR 90-97
return more_colors ? num + 1 : num - 8 + 1;
}
// Remainder aren't yet implemented
// 8- 15: high intensity colors (as in ESC [ 90–97 m)
// 16-231: 6 × 6 × 6 cube (216 colors): 16 + 36 × r + 6 × g + b (0 ≤ r, g, b ≤ 5)
// 232-255: grayscale from black to white in 24 steps
}
// Remainder aren't yet implemented
// 16-231: 6 × 6 × 6 cube (216 colors): 16 + 36 × r + 6 × g + b (0 ≤ r, g, b ≤ 5)
// 232-255: grayscale from black to white in 24 steps
}
return 0; /* not understood */
return 0; /* not understood */
}
@ -243,11 +270,15 @@ static int set_ansi_attribute(const int attrib, char** escape_sequence)
fg_col = attrib - 30 + 1;
} else if (attrib >= 40 && attrib <= 47) { /* set background color */
bg_col = attrib - 40 + 1;
} else if (attrib >= 90 && attrib <= 97) { /* set bright fg color */
fg_col = more_colors ? attrib - 90 + 9 : attrib - 90 + 1;
} else if (attrib >= 100 && attrib <= 107) { /* set bright bg color */
bg_col = more_colors ? attrib - 100 + 9 : attrib - 100 + 1;
} else {
return 0; /* Not understood */
}
}
attrset(attributes | COLOR_PAIR(bg_col * nr_of_colors + fg_col + 1));
attr_set(attributes, bg_col * nr_of_colors + fg_col + 1, NULL);
return 1;
}