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#include "cache.h"
#include "color.h"

#define COLOR_RESET "\033[m"

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 (*name && !*end && 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)
{
const char *ptr = value;
int attr = -1;
int fg = -2;
int bg = -2;

if (!strcasecmp(value, "reset")) {
strcpy(dst, "\033[m");
return;
}

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

while (word[len] && !isspace(word[len]))
len++;

ptr = word + len;
while (*ptr && isspace(*ptr))
ptr++;

val = parse_color(word, len);
if (val >= -1) {
if (fg == -2) {
fg = val;
continue;
}
if (bg == -2) {
bg = val;
continue;
}
goto bad;
}
val = parse_attr(word, len);
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 config value '%s' for variable '%s'", value, var);
}

int git_config_colorbool(const char *var, const char *value)
{
if (!value)
return 1;
if (!strcasecmp(value, "auto")) {
if (isatty(1) || (pager_in_use && pager_use_color)) {
char *term = getenv("TERM");
if (term && strcmp(term, "dumb"))
return 1;
}
return 0;
}
if (!strcasecmp(value, "never"))
return 0;
if (!strcasecmp(value, "always"))
return 1;
return git_config_bool(var, value);
}

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

if (*color)
r += printf("%s", color);
r += vprintf(fmt, args);
if (*color)
r += printf("%s", COLOR_RESET);
if (trail)
r += printf("%s", trail);
return r;
}



int color_printf(const char *color, const char *fmt, ...)
{
va_list args;
int r;
va_start(args, fmt);
r = color_vprintf(color, fmt, args, NULL);
va_end(args);
return r;
}

int color_printf_ln(const char *color, const char *fmt, ...)
{
va_list args;
int r;
va_start(args, fmt);
r = color_vprintf(color, fmt, args, "\n");
va_end(args);
return r;
}
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