git/color.c at master · sqlcode/git · GitHub

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#include "cache.h"

#include "config.h"

#include "color.h"

static int git_use_color_default = GIT_COLOR_AUTO;

int color_stdout_is_tty = -1;

* The list of available column colors.

const char *column_colors_ansi[] = {

GIT_COLOR_RED,

GIT_COLOR_GREEN,

GIT_COLOR_YELLOW,

GIT_COLOR_BLUE,

GIT_COLOR_MAGENTA,

GIT_COLOR_CYAN,

GIT_COLOR_BOLD_RED,

GIT_COLOR_BOLD_GREEN,

GIT_COLOR_BOLD_YELLOW,

GIT_COLOR_BOLD_BLUE,

GIT_COLOR_BOLD_MAGENTA,

GIT_COLOR_BOLD_CYAN,

GIT_COLOR_RESET,

};

/* Ignore the RESET at the end when giving the size */

const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;

/* An individual foreground or background color. */

struct color {

enum {

COLOR_UNSPECIFIED = 0,

COLOR_NORMAL,

COLOR_ANSI, /* basic 0-7 ANSI colors */

COLOR_256,

COLOR_RGB

} type;

/* The numeric value for ANSI and 256-color modes */

unsigned char value;

/* 24-bit RGB color values */

unsigned char red, green, blue;

};

* "word" is a buffer of length "len"; does it match the NUL-terminated

* "match" exactly?

static int match_word(const char *word, int len, const char *match)

{

return !strncasecmp(word, match, len) && !match[len];

}

static int get_hex_color(const char *in, unsigned char *out)

{

unsigned int val;

val = (hexval(in[0]) << 4) | hexval(in[1]);

if (val & ~0xff)

return -1;

*out = val;

return 0;

}

static int parse_color(struct color *out, const char *name, int len)

{

/* Positions in array must match ANSI color codes */

static const char * const color_names[] = {

"black", "red", "green", "yellow",

"blue", "magenta", "cyan", "white"

};

char *end;

int i;

long val;

/* First try the special word "normal"... */

if (match_word(name, len, "normal")) {

out->type = COLOR_NORMAL;

return 0;

}

/* Try a 24-bit RGB value */

if (len == 7 && name[0] == '#') {

if (!get_hex_color(name + 1, &out->red) &&

!get_hex_color(name + 3, &out->green) &&

!get_hex_color(name + 5, &out->blue)) {

out->type = COLOR_RGB;

return 0;

}

/* Then pick from our human-readable color names... */

for (i = 0; i < ARRAY_SIZE(color_names); i++) {

if (match_word(name, len, color_names[i])) {

out->type = COLOR_ANSI;

out->value = i;

return 0;

}

/* And finally try a literal 256-color-mode number */

val = strtol(name, &end, 10);

if (end - name == len) {

* Allow "-1" as an alias for "normal", but other negative

* numbers are bogus.

if (val < -1)

; /* fall through to error */

else if (val < 0) {

out->type = COLOR_NORMAL;

return 0;

/* Rewrite low numbers as more-portable standard colors. */

} else if (val < 8) {

out->type = COLOR_ANSI;

out->value = val;

return 0;

} else if (val < 256) {

out->type = COLOR_256;

out->value = val;

return 0;

}

return -1;

}

static int parse_attr(const char *name, size_t len)

{

static const struct {

const char *name;

size_t len;

int val, neg;

} attrs[] = {

#define ATTR(x, val, neg) { (x), sizeof(x)-1, (val), (neg) }

ATTR("bold", 1, 22),

ATTR("dim", 2, 22),

ATTR("italic", 3, 23),

ATTR("ul", 4, 24),

ATTR("blink", 5, 25),

ATTR("reverse", 7, 27),

ATTR("strike", 9, 29)

#undef ATTR

};

int negate = 0;

int i;

if (skip_prefix_mem(name, len, "no", &name, &len)) {

skip_prefix_mem(name, len, "-", &name, &len);

negate = 1;

}

for (i = 0; i < ARRAY_SIZE(attrs); i++) {

if (attrs[i].len == len && !memcmp(attrs[i].name, name, len))

return negate ? attrs[i].neg : attrs[i].val;

}

return -1;

}

int color_parse(const char *value, char *dst)

{

return color_parse_mem(value, strlen(value), dst);

}

* Write the ANSI color codes for "c" to "out"; the string should

* already have the ANSI escape code in it. "out" should have enough

* space in it to fit any color.

static char *color_output(char *out, int len, const struct color *c, char type)

{

switch (c->type) {

case COLOR_UNSPECIFIED:

case COLOR_NORMAL:

break;

case COLOR_ANSI:

if (len < 2)

BUG("color parsing ran out of space");

*out++ = type;

*out++ = '0' + c->value;

break;

case COLOR_256:

out += xsnprintf(out, len, "%c8;5;%d", type, c->value);

break;

case COLOR_RGB:

out += xsnprintf(out, len, "%c8;2;%d;%d;%d", type,

c->red, c->green, c->blue);

break;

}

return out;

}

static int color_empty(const struct color *c)

{

return c->type <= COLOR_NORMAL;

}

int color_parse_mem(const char *value, int value_len, char *dst)

{

const char *ptr = value;

int len = value_len;

char *end = dst + COLOR_MAXLEN;

unsigned int attr = 0;

struct color fg = { COLOR_UNSPECIFIED };

struct color bg = { COLOR_UNSPECIFIED };

while (len > 0 && isspace(*ptr)) {

ptr++;

len--;

}

if (!len) {

dst[0] = '\0';

return 0;

}

if (!strncasecmp(ptr, "reset", len)) {

xsnprintf(dst, end - dst, GIT_COLOR_RESET);

return 0;

}

/* [fg [bg]] [attr]... */

while (len > 0) {

const char *word = ptr;

struct color c = { COLOR_UNSPECIFIED };

int val, wordlen = 0;

while (len > 0 && !isspace(word[wordlen])) {

wordlen++;

len--;

}

ptr = word + wordlen;

while (len > 0 && isspace(*ptr)) {

ptr++;

len--;

}

if (!parse_color(&c, word, wordlen)) {

if (fg.type == COLOR_UNSPECIFIED) {

fg = c;

continue;

}

if (bg.type == COLOR_UNSPECIFIED) {

bg = c;

continue;

}

goto bad;

}

val = parse_attr(word, wordlen);

if (0 <= val)

attr |= (1 << val);

else

goto bad;

}

#undef OUT

#define OUT(x) do { \

if (dst == end) \

BUG("color parsing ran out of space"); \

*dst++ = (x); \

} while(0)

if (attr || !color_empty(&fg) || !color_empty(&bg)) {

int sep = 0;

int i;

OUT('\033');

OUT('[');

for (i = 0; attr; i++) {

unsigned bit = (1 << i);

if (!(attr & bit))

continue;

attr &= ~bit;

if (sep++)

OUT(';');

dst += xsnprintf(dst, end - dst, "%d", i);

}

if (!color_empty(&fg)) {

if (sep++)

OUT(';');

/* foreground colors are all in the 3x range */

dst = color_output(dst, end - dst, &fg, '3');

}

if (!color_empty(&bg)) {

if (sep++)

OUT(';');

/* background colors are all in the 4x range */

dst = color_output(dst, end - dst, &bg, '4');

}

OUT('m');

}

OUT(0);

return 0;

bad:

return error(_("invalid color value: %.*s"), value_len, value);

#undef OUT

}

int git_config_colorbool(const char *var, const char *value)

{

if (value) {

if (!strcasecmp(value, "never"))

return 0;

if (!strcasecmp(value, "always"))

return 1;

if (!strcasecmp(value, "auto"))

return GIT_COLOR_AUTO;

}

if (!var)

return -1;

/* Missing or explicit false to turn off colorization */

if (!git_config_bool(var, value))

return 0;

/* any normal truth value defaults to 'auto' */

return GIT_COLOR_AUTO;

}

static int check_auto_color(int fd)

{

static int color_stderr_is_tty = -1;

int *is_tty_p = fd == 1 ? &color_stdout_is_tty : &color_stderr_is_tty;

if (*is_tty_p < 0)

*is_tty_p = isatty(fd);

if (*is_tty_p || (fd == 1 && pager_in_use() && pager_use_color)) {

if (!is_terminal_dumb())

return 1;

}

return 0;

}

int want_color_fd(int fd, int var)

{

* NEEDSWORK: This function is sometimes used from multiple threads, and

* we end up using want_auto racily. That "should not matter" since

* we always write the same value, but it's still wrong. This function

* is listed in .tsan-suppressions for the time being.

static int want_auto[3] = { -1, -1, -1 };

if (fd < 1 || fd >= ARRAY_SIZE(want_auto))

BUG("file descriptor out of range: %d", fd);

if (var < 0)

var = git_use_color_default;

if (var == GIT_COLOR_AUTO) {

if (want_auto[fd] < 0)

want_auto[fd] = check_auto_color(fd);

return want_auto[fd];

}

return var;

}

int git_color_config(const char *var, const char *value, void *cb)

{

if (!strcmp(var, "color.ui")) {

git_use_color_default = git_config_colorbool(var, value);

return 0;

}

return 0;

}

int git_color_default_config(const char *var, const char *value, void *cb)

{

if (git_color_config(var, value, cb) < 0)

return -1;

return git_default_config(var, value, cb);

}

void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)

{

if (*color)

fprintf(fp, "%s", color);

fprintf(fp, "%s", sb->buf);

if (*color)

fprintf(fp, "%s", GIT_COLOR_RESET);

}

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;

}

int color_is_nil(const char *c)

{

return !strcmp(c, "NIL");

}

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