src/color.c

   1 /* Color setup
   2    Copyright (C) 1994 Miguel de Icaza.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #include <config.h>
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include "global.h"
  22 #include "tty.h"
  23 #include "setup.h"              /* For the externs */
  24 #include "color.h"
  25
  26 /* Set to force black and white display at program startup */
  27 int   disable_colors = 0;
  28
  29 /* Set if we are actually using colors */
  30 int use_colors = 0;
  31
  32 /* Color styles for normal and error dialogs */
  33 int dialog_colors [4];
  34 int alarm_colors [4];
  35
  36 #define ELEMENTS(arr) ( sizeof(arr) / sizeof((arr)[0]) )
  37
  38 #ifdef HAVE_SLANG
  39 #   define color_map_fg(n) color_map[n].fg
  40 #   define color_map_bg(n) color_map[n].bg
  41 #else
  42 #   define color_map_fg(n) (color_map[n].fg & COLOR_WHITE)
  43 #   define color_map_bg(n) (color_map[n].bg & COLOR_WHITE)
  44 #endif
  45
  46 struct colorpair {
  47     const char *name;           /* Name of the entry */
  48     CTYPE fg;                   /* foreground color */
  49     CTYPE bg;                   /* background color */
  50 };
  51
  52 static struct colorpair color_map [] = {
  53     { "normal=",     0, 0 },    /* normal */               /*  1 */
  54     { "selected=",   0, 0 },    /* selected */
  55     { "marked=",     0, 0 },    /* marked */
  56     { "markselect=", 0, 0 },    /* marked/selected */
  57     { "errors=",     0, 0 },    /* errors */
  58     { "menu=",       0, 0 },    /* menu entry */
  59     { "reverse=",    0, 0 },    /* reverse */
  60
  61     /* Dialog colors */
  62     { "dnormal=",    0, 0 },    /* Dialog normal */        /*  8 */
  63     { "dfocus=",     0, 0 },    /* Dialog focused */
  64     { "dhotnormal=", 0, 0 },    /* Dialog normal/hot */
  65     { "dhotfocus=",  0, 0 },    /* Dialog focused/hot */
  66
  67     { "viewunderline=", 0, 0 }, /* _\b? sequence in view, underline in editor */
  68     { "menusel=",    0, 0 },    /* Menu selected color */  /* 13 */
  69     { "menuhot=",    0, 0 },    /* Color for menu hotkeys */
  70     { "menuhotsel=", 0, 0 },    /* Menu hotkeys/selected entry */
  71
  72     { "helpnormal=", 0, 0 },    /* Help normal */          /* 16 */
  73     { "helpitalic=", 0, 0 },    /* Italic in help */
  74     { "helpbold=",   0, 0 },    /* Bold in help */
  75     { "helplink=",   0, 0 },    /* Not selected hyperlink */
  76     { "helpslink=",  0, 0 },    /* Selected hyperlink */
  77
  78     { "gauge=",      0, 0 },    /* Color of the progress bar (percentage) *//* 21 */
  79     { "input=",      0, 0 },
  80
  81     /* Per file types colors */
  82     { "directory=",  0, 0 },                               /*  23 */
  83     { "executable=", 0, 0 },
  84     { "link=",       0, 0 },  /* symbolic link (neither stale nor link to directory) */
  85     { "stalelink=",  0, 0 },  /* stale symbolic link */
  86     { "device=",     0, 0 },
  87     { "special=",    0, 0 }, /* sockets, fifo */
  88     { "core=",       0, 0 }, /* core files */              /* 29 */
  89
  90     { 0,             0, 0 }, /* not usable (DEFAULT_COLOR_INDEX) *//* 30 */
  91     { 0,             0, 0 }, /* unused */
  92     { 0,             0, 0 }, /* not usable (A_REVERSE) */
  93     { 0,             0, 0 }, /* not usable (A_REVERSE_BOLD) */
  94
  95 /* editor colors start at 34 */
  96     { "editnormal=",     0, 0 },        /* normal */       /* 34 */
  97     { "editbold=",       0, 0 },        /* search->found */
  98     { "editmarked=",     0, 0 },        /* marked/selected */
  99
 100 /* error dialog colors start at 37 */
 101     { "errdhotnormal=",  0, 0 }, /* Error dialog normal/hot */ /* 37 */
 102     { "errdhotfocus=",   0, 0 }, /* Error dialog focused/hot */
 103 };
 104
 105 struct color_table_s {
 106     const char *name;
 107     int  value;
 108 };
 109
 110
 111 static struct color_table_s const color_table [] = {
 112     { "black",         COLOR_BLACK   },
 113     { "gray",          COLOR_BLACK   | A_BOLD },
 114     { "red",           COLOR_RED     },
 115     { "brightred",     COLOR_RED     | A_BOLD },
 116     { "green",         COLOR_GREEN   },
 117     { "brightgreen",   COLOR_GREEN   | A_BOLD },
 118     { "brown",         COLOR_YELLOW  },
 119     { "yellow",        COLOR_YELLOW  | A_BOLD },
 120     { "blue",          COLOR_BLUE    },
 121     { "brightblue",    COLOR_BLUE    | A_BOLD },
 122     { "magenta",       COLOR_MAGENTA },
 123     { "brightmagenta", COLOR_MAGENTA | A_BOLD },
 124     { "cyan",          COLOR_CYAN    },
 125     { "brightcyan",    COLOR_CYAN    | A_BOLD },
 126     { "lightgray",     COLOR_WHITE },
 127     { "white",         COLOR_WHITE   | A_BOLD },
 128     { "default",       0 } /* default color of the terminal */
 129 };
 130
 131 static const char *default_colors =
 132 "normal=lightgray,blue:"
 133 "selected=black,cyan:"
 134 "marked=yellow,blue:"
 135 "markselect=yellow,cyan:"
 136 "errors=white,red:"
 137 "menu=white,cyan:"
 138 "reverse=black,lightgray:"
 139 "dnormal=black,lightgray:"
 140 "dfocus=black,cyan:"
 141 "dhotnormal=blue,lightgray:"
 142 "dhotfocus=blue,cyan:"
 143 "viewunderline=brightred,blue:"
 144 "menuhot=yellow,cyan:"
 145 "menusel=white,black:"
 146 "menuhotsel=yellow,black:"
 147 "helpnormal=black,lightgray:"
 148 "helpitalic=red,lightgray:"
 149 "helpbold=blue,lightgray:"
 150 "helplink=black,cyan:"
 151 "helpslink=yellow,blue:"
 152 "gauge=white,black:"
 153 "input=black,cyan:"
 154 "directory=white,blue:"
 155 "executable=brightgreen,blue:"
 156 "link=lightgray,blue:"
 157 "stalelink=brightred,blue:"
 158 "device=brightmagenta,blue:"
 159 "core=red,blue:"
 160 "special=black,blue:"
 161 "editnormal=lightgray,blue:"
 162 "editbold=yellow,blue:"
 163 "editmarked=black,cyan:"
 164 "errdhotnormal=yellow,red:"
 165 "errdhotfocus=yellow,lightgray";
 166
 167 #ifdef HAVE_SLANG
 168 #   define color_value(i) color_table [i].name
 169 #   define color_name(i)  color_table [i].name
 170 #else
 171 #   define color_value(i) color_table [i].value
 172 #   define color_name(i)  color_table [i].name
 173 #endif
 174
 175 static void get_color (const char *cpp, CTYPE *colp)
 176 {
 177     size_t i;
 178
 179     for (i = 0; i < ELEMENTS(color_table); i++){
 180         if (strcmp (cpp, color_name (i)) == 0){
 181             *colp = color_value (i);
 182             return;
 183         }
 184     }
 185 }
 186
 187 static void get_two_colors (char **cpp, struct colorpair *colorpairp)
 188 {
 189     char *p = *cpp;
 190     int state;
 191
 192     state = 0;
 193
 194     for (; *p; p++){
 195         if (*p == ':'){
 196             *p = 0;
 197             get_color (*cpp, state ? &colorpairp->bg : &colorpairp->fg);
 198             *p = ':';
 199             *cpp = p + 1;
 200             return;
 201         }
 202
 203         if (*p == ','){
 204             state = 1;
 205             *p = 0;
 206             get_color (*cpp, &colorpairp->fg);
 207             *p = ',';
 208             *cpp = p + 1;
 209         }
 210     }
 211     get_color (*cpp, state ? &colorpairp->bg : &colorpairp->fg);
 212 }
 213
 214 static void configure_colors_string (const char *the_color_string)
 215 {
 216     char *color_string, *p;
 217     size_t i;
 218     int found;
 219
 220     if (!the_color_string)
 221         return;
 222
 223     p = color_string = g_strdup (the_color_string);
 224     while (color_string && *color_string){
 225         while (*color_string == ' ' || *color_string == '\t')
 226             color_string++;
 227
 228         found = 0;
 229         for (i = 0; i < ELEMENTS(color_map); i++){
 230             int klen;
 231
 232             if (!color_map [i].name)
 233                 continue;
 234             klen = strlen (color_map [i].name);
 235
 236             if (strncmp (color_string, color_map [i].name, klen) == 0){
 237                 color_string += klen;
 238                 get_two_colors (&color_string, &color_map [i]);
 239                 found = 1;
 240             }
 241         }
 242         if (!found){
 243                 while (*color_string && *color_string != ':')
 244                         color_string++;
 245                 if (*color_string)
 246                         color_string++;
 247         }
 248     }
 249    g_free (p);
 250 }
 251
 252 static void configure_colors (void)
 253 {
 254     extern char *command_line_colors;
 255
 256     configure_colors_string (default_colors);
 257     configure_colors_string (setup_color_string);
 258     configure_colors_string (term_color_string);
 259     configure_colors_string (getenv ("MC_COLOR_TABLE"));
 260     configure_colors_string (command_line_colors);
 261 }
 262
 263 #ifndef HAVE_SLANG
 264 #define MAX_PAIRS 64
 265 int attr_pairs [MAX_PAIRS];
 266 #endif
 267
 268 static void
 269 load_dialog_colors (void)
 270 {
 271     dialog_colors [0] = COLOR_NORMAL;
 272     dialog_colors [1] = COLOR_FOCUS;
 273     dialog_colors [2] = COLOR_HOT_NORMAL;
 274     dialog_colors [3] = COLOR_HOT_FOCUS;
 275
 276     alarm_colors [0] = ERROR_COLOR;
 277     alarm_colors [1] = REVERSE_COLOR;
 278     alarm_colors [2] = ERROR_HOT_NORMAL;
 279     alarm_colors [3] = ERROR_HOT_FOCUS;
 280 }
 281
 282 void init_colors (void)
 283 {
 284     size_t i;
 285
 286     int hascolors;
 287
 288     /* FIXME: if S-Lang is used, this function must be called regardless
 289        of whether we are interested in its result */
 290     hascolors = has_colors ();
 291
 292     if (!disable_colors && hascolors){
 293         use_colors = 1;
 294     }
 295
 296     if (use_colors){
 297         start_color ();
 298         configure_colors ();
 299
 300 #ifndef HAVE_SLANG
 301         if (ELEMENTS (color_map) > MAX_PAIRS){
 302             /* This message should only be seen by the developers */
 303             fprintf (stderr,
 304                      "Too many defined colors, resize MAX_PAIRS on color.c");
 305             exit (1);
 306         }
 307 #endif /* !HAVE_SLANG */
 308
 309         if (use_colors) {
 310 #ifdef HAVE_SLANG
 311             /*
 312              * We are relying on undocumented feature of
 313              * S-Lang to make COLOR_PAIR(DEFAULT_COLOR_INDEX)
 314              * the default fg/bg of the terminal.
 315              * Hopefully, future versions of S-Lang will
 316              * document this feature.
 317              */
 318             SLtt_set_color (DEFAULT_COLOR_INDEX, NULL, "default", "default");
 319 #else
 320             /* Always white on black */
 321             mc_init_pair(DEFAULT_COLOR_INDEX, COLOR_WHITE, COLOR_BLACK);
 322 #endif /* !HAVE_SLANG */
 323         }
 324
 325         for (i = 0; i < ELEMENTS (color_map); i++){
 326             if (!color_map [i].name)
 327                 continue;
 328
 329             mc_init_pair (i+1, color_map_fg(i), color_map_bg(i));
 330
 331 #ifndef HAVE_SLANG
 332             /*
 333              * ncurses doesn't remember bold attribute in the color pairs,
 334              * so we should keep track of it in a separate array.
 335              */
 336              attr_pairs [i+1] = color_map [i].fg & A_BOLD;
 337 #endif /* !HAVE_SLANG */
 338         }
 339     }
 340     load_dialog_colors ();
 341 }
 342
 343 /* Functions necessary to implement syntax highlighting  */
 344
 345 static int max_index = 0;
 346
 347 static int
 348 alloc_color_pair (CTYPE foreground, CTYPE background)
 349 {
 350     mc_init_pair (++max_index, foreground, background);
 351     return max_index;
 352 }
 353
 354 static struct colors_avail {
 355     struct colors_avail *next;
 356     char *fg, *bg;
 357     int index;
 358 } c = { 0, 0, 0, 0 };
 359
 360 #ifdef HAVE_SLANG
 361 void
 362 mc_init_pair (int index, CTYPE foreground, CTYPE background)
 363 {
 364     if (!background)
 365         background = "default";
 366
 367     if (!foreground)
 368         foreground = "default";
 369
 370     SLtt_set_color (index, "", (char *) foreground, (char *) background);
 371     if (index > max_index)
 372         max_index = index;
 373 }
 374
 375 int
 376 try_alloc_color_pair (const char *fg, const char *bg)
 377 {
 378     struct colors_avail *p = &c;
 379
 380     c.index = EDITOR_NORMAL_COLOR_INDEX;
 381     for (;;) {
 382         if (((fg && p->fg) ? !strcmp (fg, p->fg) : fg == p->fg) != 0
 383             && ((bg && p->bg) ? !strcmp (bg, p->bg) : bg == p->bg) != 0)
 384             return p->index;
 385         if (!p->next)
 386             break;
 387         p = p->next;
 388     }
 389     p->next = g_new (struct colors_avail, 1);
 390     p = p->next;
 391     p->next = 0;
 392     p->fg = fg ? g_strdup (fg) : 0;
 393     p->bg = bg ? g_strdup (bg) : 0;
 394     if (!fg)
 395         /* Index in color_map array = COLOR_INDEX - 1 */
 396         fg = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].fg;
 397     if (!bg)
 398         bg = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].bg;
 399     p->index = alloc_color_pair (fg, bg);
 400     return p->index;
 401 }
 402
 403 #else /* !HAVE_SLANG */
 404 void
 405 mc_init_pair (int index, CTYPE foreground, CTYPE background)
 406 {
 407     init_pair (index, foreground, background);
 408     if (index > max_index)
 409         max_index = index;
 410 }
 411
 412 int
 413 try_alloc_color_pair (const char *fg, const char *bg)
 414 {
 415     int fg_index, bg_index;
 416     int bold_attr;
 417     struct colors_avail *p = &c;
 418
 419     c.index = EDITOR_NORMAL_COLOR_INDEX;
 420     for (;;) {
 421         if (((fg && p->fg) ? !strcmp (fg, p->fg) : fg == p->fg) != 0
 422             && ((bg && p->bg) ? !strcmp (bg, p->bg) : bg == p->bg) != 0)
 423             return p->index;
 424         if (!p->next)
 425             break;
 426         p = p->next;
 427     }
 428     p->next = g_new (struct colors_avail, 1);
 429     p = p->next;
 430     p->next = 0;
 431     p->fg = fg ? g_strdup (fg) : 0;
 432     p->bg = bg ? g_strdup (bg) : 0;
 433     if (!fg)
 434         /* Index in color_map array = COLOR_INDEX - 1 */
 435         fg_index = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].fg;
 436     else
 437         get_color (fg, &fg_index);
 438
 439     if (!bg)
 440         bg_index = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].bg;
 441     else
 442         get_color (bg, &bg_index);
 443
 444     bold_attr = fg_index & A_BOLD;
 445     fg_index = fg_index & COLOR_WHITE;
 446     bg_index = bg_index & COLOR_WHITE;
 447
 448     p->index = alloc_color_pair (fg_index, bg_index);
 449     attr_pairs [p->index] = bold_attr;
 450     return p->index;
 451 }
 452 #endif /* !HAVE_SLANG */
 453
 454 void
 455 done_colors (void)
 456 {
 457     struct colors_avail *p, *next;
 458
 459     for (p = c.next; p; p = next) {
 460         next = p->next;
 461         g_free (p->fg);
 462         g_free (p->bg);
 463         g_free (p);
 464     }
 465     c.next = NULL;
 466 }
 467