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tag: v1.7.0.2
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#include "cache.h"
#include "color.h"

int git_use_color_default = 0;

static int parse_color(const char *name, int len)
{
static const char * const color_names[] = {
"normal", "black", "red", "green", "yellow",
"blue", "magenta", "cyan", "white"
};
char *end;
int i;
for (i = 0; i < ARRAY_SIZE(color_names); i++) {
const char *str = color_names[i];
if (!strncasecmp(name, str, len) && !str[len])
return i - 1;
}
i = strtol(name, &end, 10);
if (end - name == len && i >= -1 && i <= 255)
return i;
return -2;
}

static int parse_attr(const char *name, int len)
{
static const int attr_values[] = { 1, 2, 4, 5, 7 };
static const char * const attr_names[] = {
"bold", "dim", "ul", "blink", "reverse"
};
int i;
for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
const char *str = attr_names[i];
if (!strncasecmp(name, str, len) && !str[len])
return attr_values[i];
}
return -1;
}

void color_parse(const char *value, const char *var, char *dst)
{
color_parse_mem(value, strlen(value), var, dst);
}

void color_parse_mem(const char *value, int value_len, const char *var,
char *dst)
{
const char *ptr = value;
int len = value_len;
int attr = -1;
int fg = -2;
int bg = -2;

if (!strncasecmp(value, "reset", len)) {
strcpy(dst, GIT_COLOR_RESET);
return;
}

/* [fg [bg]] [attr] */
while (len > 0) {
const char *word = ptr;
int val, wordlen = 0;

while (len > 0 && !isspace(word[wordlen])) {
wordlen++;
len--;
}

ptr = word + wordlen;
while (len > 0 && isspace(*ptr)) {
ptr++;
len--;
}

val = parse_color(word, wordlen);
if (val >= -1) {
if (fg == -2) {
fg = val;
continue;
}
if (bg == -2) {
bg = val;
continue;
}
goto bad;
}
val = parse_attr(word, wordlen);
if (val < 0 || attr != -1)
goto bad;
attr = val;
}

if (attr >= 0 || fg >= 0 || bg >= 0) {
int sep = 0;

*dst++ = '\033';
*dst++ = '[';
if (attr >= 0) {
*dst++ = '0' + attr;
sep++;
}
if (fg >= 0) {
if (sep++)
*dst++ = ';';
if (fg < 8) {
*dst++ = '3';
*dst++ = '0' + fg;
} else {
dst += sprintf(dst, "38;5;%d", fg);
}
}
if (bg >= 0) {
if (sep++)
*dst++ = ';';
if (bg < 8) {
*dst++ = '4';
*dst++ = '0' + bg;
} else {
dst += sprintf(dst, "48;5;%d", bg);
}
}
*dst++ = 'm';
}
*dst = 0;
return;
bad:
die("bad color value '%.*s' for variable '%s'", value_len, value, var);
}

int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
{
if (value) {
if (!strcasecmp(value, "never"))
return 0;
if (!strcasecmp(value, "always"))
return 1;
if (!strcasecmp(value, "auto"))
goto auto_color;
}

/* Missing or explicit false to turn off colorization */
if (!git_config_bool(var, value))
return 0;

/* any normal truth value defaults to 'auto' */
 auto_color:
if (stdout_is_tty < 0)
stdout_is_tty = isatty(1);
if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
char *term = getenv("TERM");
if (term && strcmp(term, "dumb"))
return 1;
}
return 0;
}

int git_color_default_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "color.ui")) {
git_use_color_default = git_config_colorbool(var, value, -1);
return 0;
}

return git_default_config(var, value, cb);
}

static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
va_list args, const char *trail)
{
int r = 0;

if (*color)
r += fprintf(fp, "%s", color);
r += vfprintf(fp, fmt, args);
if (*color)
r += fprintf(fp, "%s", GIT_COLOR_RESET);
if (trail)
r += fprintf(fp, "%s", trail);
return r;
}



int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
{
va_list args;
int r;
va_start(args, fmt);
r = color_vfprintf(fp, color, fmt, args, NULL);
va_end(args);
return r;
}

int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
{
va_list args;
int r;
va_start(args, fmt);
r = color_vfprintf(fp, color, fmt, args, "\n");
va_end(args);
return r;
}

/*
* This function splits the buffer by newlines and colors the lines individually.
*
* Returns 0 on success.
*/
int color_fwrite_lines(FILE *fp, const char *color,
size_t count, const char *buf)
{
if (!*color)
return fwrite(buf, count, 1, fp) != 1;
while (count) {
char *p = memchr(buf, '\n', count);
if (p != buf && (fputs(color, fp) < 0 ||
fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
fputs(GIT_COLOR_RESET, fp) < 0))
return -1;
if (!p)
return 0;
if (fputc('\n', fp) < 0)
return -1;
count -= p + 1 - buf;
buf = p + 1;
}
return 0;
}
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