color.h

   1 #ifndef COLOR_H
   2 #define COLOR_H
   3
   4 struct strbuf;
   5
   6 /*
   7  * The maximum length of ANSI color sequence we would generate:
   8  * - leading ESC '['            2
   9  * - attr + ';'                 2 * num_attr (e.g. "1;")
  10  * - no-attr + ';'              3 * num_attr (e.g. "22;")
  11  * - fg color + ';'             17 (e.g. "38;2;255;255;255;")
  12  * - bg color + ';'             17 (e.g. "48;2;255;255;255;")
  13  * - terminating 'm' NUL        2
  14  *
  15  * The above overcounts by one semicolon but it is close enough.
  16  *
  17  * The space for attributes is also slightly overallocated, as
  18  * the negation for some attributes is the same (e.g., nobold and nodim).
  19  *
  20  * We allocate space for 7 attributes.
  21  */
  22 #define COLOR_MAXLEN 75
  23
  24 #define GIT_COLOR_NORMAL        ""
  25 #define GIT_COLOR_RESET         "\033[m"
  26 #define GIT_COLOR_BOLD          "\033[1m"
  27 #define GIT_COLOR_RED           "\033[31m"
  28 #define GIT_COLOR_GREEN         "\033[32m"
  29 #define GIT_COLOR_YELLOW        "\033[33m"
  30 #define GIT_COLOR_BLUE          "\033[34m"
  31 #define GIT_COLOR_MAGENTA       "\033[35m"
  32 #define GIT_COLOR_CYAN          "\033[36m"
  33 #define GIT_COLOR_BOLD_RED      "\033[1;31m"
  34 #define GIT_COLOR_BOLD_GREEN    "\033[1;32m"
  35 #define GIT_COLOR_BOLD_YELLOW   "\033[1;33m"
  36 #define GIT_COLOR_BOLD_BLUE     "\033[1;34m"
  37 #define GIT_COLOR_BOLD_MAGENTA  "\033[1;35m"
  38 #define GIT_COLOR_BOLD_CYAN     "\033[1;36m"
  39 #define GIT_COLOR_BG_RED        "\033[41m"
  40 #define GIT_COLOR_BG_GREEN      "\033[42m"
  41 #define GIT_COLOR_BG_YELLOW     "\033[43m"
  42 #define GIT_COLOR_BG_BLUE       "\033[44m"
  43 #define GIT_COLOR_BG_MAGENTA    "\033[45m"
  44 #define GIT_COLOR_BG_CYAN       "\033[46m"
  45 #define GIT_COLOR_FAINT         "\033[2m"
  46 #define GIT_COLOR_FAINT_ITALIC  "\033[2;3m"
  47
  48 /* A special value meaning "no color selected" */
  49 #define GIT_COLOR_NIL "NIL"
  50
  51 /*
  52  * The first three are chosen to match common usage in the code, and what is
  53  * returned from git_config_colorbool. The "auto" value can be returned from
  54  * config_colorbool, and will be converted by want_color() into either 0 or 1.
  55  */
  56 #define GIT_COLOR_UNKNOWN -1
  57 #define GIT_COLOR_NEVER  0
  58 #define GIT_COLOR_ALWAYS 1
  59 #define GIT_COLOR_AUTO   2
  60
  61 /* A default list of colors to use for commit graphs and show-branch output */
  62 extern const char *column_colors_ansi[];
  63 extern const int column_colors_ansi_max;
  64
  65 /*
  66  * Generally the color code will lazily figure this out itself, but
  67  * this provides a mechanism for callers to override autodetection.
  68  */
  69 extern int color_stdout_is_tty;
  70
  71 /*
  72  * Use the first one if you need only color config; the second is a convenience
  73  * if you are just going to change to git_default_config, too.
  74  */
  75 int git_color_config(const char *var, const char *value, void *cb);
  76 int git_color_default_config(const char *var, const char *value, void *cb);
  77
  78 /*
  79  * Parse a config option, which can be a boolean or one of
  80  * "never", "auto", "always". Return a constant of
  81  * GIT_COLOR_NEVER for "never" or negative boolean,
  82  * GIT_COLOR_ALWAYS for "always" or a positive boolean,
  83  * and GIT_COLOR_AUTO for "auto".
  84  */
  85 int git_config_colorbool(const char *var, const char *value);
  86
  87 /*
  88  * Return a boolean whether to use color, where the argument 'var' is
  89  * one of GIT_COLOR_UNKNOWN, GIT_COLOR_NEVER, GIT_COLOR_ALWAYS, GIT_COLOR_AUTO.
  90  */
  91 int want_color_fd(int fd, int var);
  92 #define want_color(colorbool) want_color_fd(1, (colorbool))
  93 #define want_color_stderr(colorbool) want_color_fd(2, (colorbool))
  94
  95 /*
  96  * Translate a Git color from 'value' into a string that the terminal can
  97  * interpret and store it into 'dst'. The Git color values are of the form
  98  * "foreground [background] [attr]" where fore- and background can be a color
  99  * name ("red"), a RGB code (#0xFF0000) or a 256-color-mode from the terminal.
 100  */
 101 int color_parse(const char *value, char *dst);
 102 int color_parse_mem(const char *value, int len, char *dst);
 103
 104 /*
 105  * Output the formatted string in the specified color (and then reset to normal
 106  * color so subsequent output is uncolored). Omits the color encapsulation if
 107  * `color` is NULL. The `color_fprintf_ln` prints a new line after resetting
 108  * the color.  The `color_print_strbuf` prints the contents of the given
 109  * strbuf (BUG: but only up to its first NUL character).
 110  */
 111 __attribute__((format (printf, 3, 4)))
 112 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...);
 113 __attribute__((format (printf, 3, 4)))
 114 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...);
 115 void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb);
 116
 117 /*
 118  * Check if the given color is GIT_COLOR_NIL that means "no color selected".
 119  * The caller needs to replace the color with the actual desired color.
 120  */
 121 int color_is_nil(const char *color);
 122
 123 #endif /* COLOR_H */