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368332c471
* jk/squelch-false-warning-from-gcc-o3: color_parse_mem: initialize "struct color" temporary error_errno: use constant return similar to error()
411 lines
8.4 KiB
C
411 lines
8.4 KiB
C
#include "cache.h"
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#include "color.h"
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static int git_use_color_default = GIT_COLOR_AUTO;
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int color_stdout_is_tty = -1;
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/*
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* The list of available column colors.
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*/
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const char *column_colors_ansi[] = {
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GIT_COLOR_RED,
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GIT_COLOR_GREEN,
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GIT_COLOR_YELLOW,
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GIT_COLOR_BLUE,
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GIT_COLOR_MAGENTA,
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GIT_COLOR_CYAN,
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GIT_COLOR_BOLD_RED,
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GIT_COLOR_BOLD_GREEN,
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GIT_COLOR_BOLD_YELLOW,
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GIT_COLOR_BOLD_BLUE,
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GIT_COLOR_BOLD_MAGENTA,
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GIT_COLOR_BOLD_CYAN,
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GIT_COLOR_RESET,
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};
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/* Ignore the RESET at the end when giving the size */
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const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;
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/* An individual foreground or background color. */
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struct color {
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enum {
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COLOR_UNSPECIFIED = 0,
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COLOR_NORMAL,
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COLOR_ANSI, /* basic 0-7 ANSI colors */
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COLOR_256,
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COLOR_RGB
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} type;
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/* The numeric value for ANSI and 256-color modes */
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unsigned char value;
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/* 24-bit RGB color values */
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unsigned char red, green, blue;
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};
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/*
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* "word" is a buffer of length "len"; does it match the NUL-terminated
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* "match" exactly?
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*/
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static int match_word(const char *word, int len, const char *match)
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{
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return !strncasecmp(word, match, len) && !match[len];
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}
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static int get_hex_color(const char *in, unsigned char *out)
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{
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unsigned int val;
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val = (hexval(in[0]) << 4) | hexval(in[1]);
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if (val & ~0xff)
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return -1;
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*out = val;
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return 0;
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}
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static int parse_color(struct color *out, const char *name, int len)
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{
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/* Positions in array must match ANSI color codes */
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static const char * const color_names[] = {
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"black", "red", "green", "yellow",
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"blue", "magenta", "cyan", "white"
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};
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char *end;
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int i;
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long val;
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/* First try the special word "normal"... */
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if (match_word(name, len, "normal")) {
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out->type = COLOR_NORMAL;
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return 0;
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}
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/* Try a 24-bit RGB value */
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if (len == 7 && name[0] == '#') {
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if (!get_hex_color(name + 1, &out->red) &&
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!get_hex_color(name + 3, &out->green) &&
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!get_hex_color(name + 5, &out->blue)) {
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out->type = COLOR_RGB;
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return 0;
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}
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}
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/* Then pick from our human-readable color names... */
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for (i = 0; i < ARRAY_SIZE(color_names); i++) {
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if (match_word(name, len, color_names[i])) {
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out->type = COLOR_ANSI;
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out->value = i;
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return 0;
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}
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}
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/* And finally try a literal 256-color-mode number */
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val = strtol(name, &end, 10);
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if (end - name == len) {
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/*
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* Allow "-1" as an alias for "normal", but other negative
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* numbers are bogus.
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*/
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if (val < -1)
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; /* fall through to error */
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else if (val < 0) {
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out->type = COLOR_NORMAL;
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return 0;
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/* Rewrite low numbers as more-portable standard colors. */
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} else if (val < 8) {
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out->type = COLOR_ANSI;
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out->value = val;
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return 0;
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} else if (val < 256) {
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out->type = COLOR_256;
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out->value = val;
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return 0;
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}
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}
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return -1;
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}
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static int parse_attr(const char *name, size_t len)
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{
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static const struct {
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const char *name;
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size_t len;
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int val, neg;
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} attrs[] = {
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#define ATTR(x, val, neg) { (x), sizeof(x)-1, (val), (neg) }
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ATTR("bold", 1, 22),
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ATTR("dim", 2, 22),
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ATTR("italic", 3, 23),
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ATTR("ul", 4, 24),
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ATTR("blink", 5, 25),
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ATTR("reverse", 7, 27),
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ATTR("strike", 9, 29)
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#undef ATTR
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};
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int negate = 0;
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int i;
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if (skip_prefix_mem(name, len, "no", &name, &len)) {
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skip_prefix_mem(name, len, "-", &name, &len);
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negate = 1;
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}
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for (i = 0; i < ARRAY_SIZE(attrs); i++) {
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if (attrs[i].len == len && !memcmp(attrs[i].name, name, len))
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return negate ? attrs[i].neg : attrs[i].val;
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}
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return -1;
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}
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int color_parse(const char *value, char *dst)
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{
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return color_parse_mem(value, strlen(value), dst);
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}
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void color_set(char *dst, const char *color_bytes)
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{
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xsnprintf(dst, COLOR_MAXLEN, "%s", color_bytes);
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}
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/*
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* Write the ANSI color codes for "c" to "out"; the string should
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* already have the ANSI escape code in it. "out" should have enough
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* space in it to fit any color.
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*/
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static char *color_output(char *out, int len, const struct color *c, char type)
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{
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switch (c->type) {
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case COLOR_UNSPECIFIED:
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case COLOR_NORMAL:
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break;
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case COLOR_ANSI:
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if (len < 2)
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die("BUG: color parsing ran out of space");
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*out++ = type;
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*out++ = '0' + c->value;
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break;
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case COLOR_256:
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out += xsnprintf(out, len, "%c8;5;%d", type, c->value);
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break;
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case COLOR_RGB:
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out += xsnprintf(out, len, "%c8;2;%d;%d;%d", type,
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c->red, c->green, c->blue);
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break;
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}
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return out;
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}
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static int color_empty(const struct color *c)
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{
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return c->type <= COLOR_NORMAL;
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}
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int color_parse_mem(const char *value, int value_len, char *dst)
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{
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const char *ptr = value;
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int len = value_len;
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char *end = dst + COLOR_MAXLEN;
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unsigned int attr = 0;
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struct color fg = { COLOR_UNSPECIFIED };
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struct color bg = { COLOR_UNSPECIFIED };
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if (!strncasecmp(value, "reset", len)) {
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xsnprintf(dst, end - dst, GIT_COLOR_RESET);
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return 0;
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}
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/* [fg [bg]] [attr]... */
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while (len > 0) {
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const char *word = ptr;
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struct color c = { COLOR_UNSPECIFIED };
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int val, wordlen = 0;
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while (len > 0 && !isspace(word[wordlen])) {
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wordlen++;
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len--;
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}
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ptr = word + wordlen;
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while (len > 0 && isspace(*ptr)) {
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ptr++;
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len--;
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}
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if (!parse_color(&c, word, wordlen)) {
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if (fg.type == COLOR_UNSPECIFIED) {
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fg = c;
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continue;
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}
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if (bg.type == COLOR_UNSPECIFIED) {
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bg = c;
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continue;
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}
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goto bad;
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}
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val = parse_attr(word, wordlen);
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if (0 <= val)
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attr |= (1 << val);
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else
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goto bad;
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}
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#undef OUT
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#define OUT(x) do { \
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if (dst == end) \
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die("BUG: color parsing ran out of space"); \
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*dst++ = (x); \
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} while(0)
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if (attr || !color_empty(&fg) || !color_empty(&bg)) {
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int sep = 0;
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int i;
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OUT('\033');
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OUT('[');
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for (i = 0; attr; i++) {
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unsigned bit = (1 << i);
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if (!(attr & bit))
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continue;
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attr &= ~bit;
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if (sep++)
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OUT(';');
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dst += xsnprintf(dst, end - dst, "%d", i);
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}
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if (!color_empty(&fg)) {
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if (sep++)
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OUT(';');
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/* foreground colors are all in the 3x range */
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dst = color_output(dst, end - dst, &fg, '3');
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}
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if (!color_empty(&bg)) {
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if (sep++)
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OUT(';');
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/* background colors are all in the 4x range */
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dst = color_output(dst, end - dst, &bg, '4');
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}
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OUT('m');
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}
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OUT(0);
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return 0;
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bad:
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return error(_("invalid color value: %.*s"), value_len, value);
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#undef OUT
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}
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int git_config_colorbool(const char *var, const char *value)
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{
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if (value) {
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if (!strcasecmp(value, "never"))
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return 0;
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if (!strcasecmp(value, "always"))
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return 1;
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if (!strcasecmp(value, "auto"))
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return GIT_COLOR_AUTO;
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}
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if (!var)
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return -1;
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/* Missing or explicit false to turn off colorization */
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if (!git_config_bool(var, value))
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return 0;
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/* any normal truth value defaults to 'auto' */
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return GIT_COLOR_AUTO;
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}
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static int check_auto_color(void)
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{
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if (color_stdout_is_tty < 0)
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color_stdout_is_tty = isatty(1);
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if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
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char *term = getenv("TERM");
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if (term && strcmp(term, "dumb"))
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return 1;
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}
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return 0;
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}
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int want_color(int var)
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{
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static int want_auto = -1;
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if (var < 0)
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var = git_use_color_default;
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if (var == GIT_COLOR_AUTO) {
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if (want_auto < 0)
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want_auto = check_auto_color();
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return want_auto;
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}
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return var;
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}
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int git_color_config(const char *var, const char *value, void *cb)
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{
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if (!strcmp(var, "color.ui")) {
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git_use_color_default = git_config_colorbool(var, value);
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return 0;
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}
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return 0;
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}
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int git_color_default_config(const char *var, const char *value, void *cb)
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{
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if (git_color_config(var, value, cb) < 0)
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return -1;
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return git_default_config(var, value, cb);
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}
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void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
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{
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if (*color)
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fprintf(fp, "%s", color);
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fprintf(fp, "%s", sb->buf);
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if (*color)
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fprintf(fp, "%s", GIT_COLOR_RESET);
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}
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static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
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va_list args, const char *trail)
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{
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int r = 0;
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if (*color)
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r += fprintf(fp, "%s", color);
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r += vfprintf(fp, fmt, args);
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if (*color)
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r += fprintf(fp, "%s", GIT_COLOR_RESET);
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if (trail)
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r += fprintf(fp, "%s", trail);
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return r;
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}
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int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
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{
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va_list args;
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int r;
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va_start(args, fmt);
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r = color_vfprintf(fp, color, fmt, args, NULL);
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va_end(args);
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return r;
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}
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int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
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{
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va_list args;
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int r;
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va_start(args, fmt);
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r = color_vfprintf(fp, color, fmt, args, "\n");
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va_end(args);
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return r;
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}
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int color_is_nil(const char *c)
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{
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return !strcmp(c, "NIL");
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}
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