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 /* "$Id$" */
  27
  28 /* To avoid excessive calls to ncurses' has_colors () */
  29 int   hascolors = 0;
  30
  31 /* Set to force black and white display at program startup */
  32 int   disable_colors = 0;
  33
  34 /* Set if we are actually using colors */
  35 int use_colors = 0;
  36
  37 int dialog_colors [4];
  38
  39 #define ELEMENTS(arr) ( sizeof(arr) / sizeof((arr)[0]) )
  40
  41 #ifdef HAVE_SLANG
  42 #   define color_map_fg(n) color_map[n].fg
  43 #   define color_map_bg(n) color_map[n].bg
  44 #else
  45 #   define color_map_fg(n) (color_map[n].fg & COLOR_WHITE)
  46 #   define color_map_bg(n) (color_map[n].bg & COLOR_WHITE)
  47 #endif
  48
  49 struct colorpair {
  50     char *name;                 /* Name of the entry */
  51     CTYPE fg;                   /* foreground color */
  52     CTYPE bg;                   /* background color */
  53 };
  54
  55 struct colorpair color_map [] = {
  56     { "normal=",     0, 0 },    /* normal */               /*  1 */
  57     { "selected=",   0, 0 },    /* selected */
  58     { "marked=",     0, 0 },    /* marked */
  59     { "markselect=", 0, 0 },    /* marked/selected */
  60     { "errors=",     0, 0 },    /* errors */
  61     { "menu=",       0, 0 },    /* menu entry */
  62     { "reverse=",    0, 0 },    /* reverse */
  63
  64     /* Dialog colors */
  65     { "dnormal=",    0, 0 },    /* Dialog normal */        /*  8 */
  66     { "dfocus=",     0, 0 },    /* Dialog focused */
  67     { "dhotnormal=", 0, 0 },    /* Dialog normal/hot */
  68     { "dhotfocus=",  0, 0 },    /* Dialog focused/hot */
  69
  70     { "viewunderline=", 0, 0 }, /* _\b? sequence in view, underline in editor */
  71     { "menusel=",    0, 0 },    /* Menu selected color */  /* 13 */
  72     { "menuhot=",    0, 0 },    /* Color for menu hotkeys */
  73     { "menuhotsel=", 0, 0 },    /* Menu hotkeys/selected entry */
  74
  75     { "helpnormal=", 0, 0 },    /* Help normal */          /* 16 */
  76     { "helpitalic=", 0, 0 },    /* Italic in help */
  77     { "helpbold=",   0, 0 },    /* Bold in help */
  78     { "helplink=",   0, 0 },    /* Not selected hyperlink */
  79     { "helpslink=",  0, 0 },    /* Selected hyperlink */
  80
  81     { "gauge=",      0, 0 },    /* Color of the progress bar (percentage) *//* 21 */
  82     { "input=",      0, 0 },
  83
  84     /* Per file types colors */
  85     { "directory=",  0, 0 },                               /*  23 */
  86     { "executable=", 0, 0 },
  87     { "link=",       0, 0 },  /* symbolic link (neither stalled nor link to directory) */
  88     { "stalledlink=",0, 0 },  /* stalled symbolic link */
  89     { "device=",     0, 0 },
  90     { "special=",    0, 0 }, /* sockets, fifo */
  91     { "core=",       0, 0 }, /* core files */              /* 29 */
  92
  93     { 0,             0, 0 }, /* not usable (DEFAULT_COLOR_INDEX) *//* 30 */
  94     { 0,             0, 0 }, /* unused */
  95     { 0,             0, 0 }, /* not usable (A_REVERSE) */
  96     { 0,             0, 0 }, /* not usable (A_REVERSE_BOLD) */
  97
  98 /* editor colors start at 34 */
  99     { "editnormal=",     0, 0 },        /* normal */       /* 34 */
 100     { "editbold=",       0, 0 },        /* search->found */
 101     { "editmarked=",     0, 0 },        /* marked/selected */
 102 };
 103
 104 struct color_table_s {
 105     char *name;
 106     int  value;
 107 };
 108
 109
 110 static struct color_table_s const color_table [] = {
 111     { "black",         COLOR_BLACK   },
 112     { "gray",          COLOR_BLACK   | A_BOLD },
 113     { "red",           COLOR_RED     },
 114     { "brightred",     COLOR_RED     | A_BOLD },
 115     { "green",         COLOR_GREEN   },
 116     { "brightgreen",   COLOR_GREEN   | A_BOLD },
 117     { "brown",         COLOR_YELLOW  },
 118     { "yellow",        COLOR_YELLOW  | A_BOLD },
 119     { "blue",          COLOR_BLUE    },
 120     { "brightblue",    COLOR_BLUE    | A_BOLD },
 121     { "magenta",       COLOR_MAGENTA },
 122     { "brightmagenta", COLOR_MAGENTA | A_BOLD },
 123     { "cyan",          COLOR_CYAN    },
 124     { "brightcyan",    COLOR_CYAN    | A_BOLD },
 125     { "lightgray",     COLOR_WHITE },
 126     { "white",         COLOR_WHITE   | A_BOLD },
 127     { "default",       0 } /* hack for transparent background */
 128 };
 129
 130 #ifdef HAVE_SLANG
 131 #   define color_value(i) color_table [i].name
 132 #   define color_name(i)  color_table [i].name
 133 #else
 134 #   define color_value(i) color_table [i].value
 135 #   define color_name(i)  color_table [i].name
 136 #endif
 137
 138 static void get_color (char *cpp, CTYPE *colp)
 139 {
 140     int i;
 141
 142     for (i = 0; i < ELEMENTS(color_table); i++){
 143         if (strcmp (cpp, color_name (i)) == 0){
 144             *colp = color_value (i);
 145             return;
 146         }
 147     }
 148 }
 149
 150 static void get_two_colors (char **cpp, struct colorpair *colorpairp)
 151 {
 152     char *p = *cpp;
 153     int state;
 154
 155     state = 0;
 156
 157     for (; *p; p++){
 158         if (*p == ':'){
 159             *p = 0;
 160             get_color (*cpp, state ? &colorpairp->bg : &colorpairp->fg);
 161             *p = ':';
 162             *cpp = p + 1;
 163             return;
 164         }
 165
 166         if (*p == ','){
 167             state = 1;
 168             *p = 0;
 169             get_color (*cpp, &colorpairp->fg);
 170             *p = ',';
 171             *cpp = p + 1;
 172         }
 173     }
 174     get_color (*cpp, state ? &colorpairp->bg : &colorpairp->fg);
 175 }
 176
 177 static void configure_colors_string (char *the_color_string)
 178 {
 179     char *color_string, *p;
 180     int  i, found;
 181
 182     if (!the_color_string)
 183         return;
 184
 185     p = color_string = g_strdup (the_color_string);
 186     while (color_string && *color_string){
 187         while (*color_string == ' ' || *color_string == '\t')
 188             color_string++;
 189
 190         found = 0;
 191         for (i = 0; i < ELEMENTS(color_map); i++){
 192             int klen;
 193
 194             if (!color_map [i].name)
 195                 continue;
 196             klen = strlen (color_map [i].name);
 197
 198             if (strncmp (color_string, color_map [i].name, klen) == 0){
 199                 color_string += klen;
 200                 get_two_colors (&color_string, &color_map [i]);
 201                 found = 1;
 202             }
 203         }
 204         if (!found){
 205                 while (*color_string && *color_string != ':')
 206                         color_string++;
 207                 if (*color_string)
 208                         color_string++;
 209         }
 210     }
 211    g_free (p);
 212 }
 213
 214 static void configure_colors (void)
 215 {
 216     extern char *command_line_colors;
 217     extern char *default_edition_colors;
 218
 219     configure_colors_string (default_edition_colors);
 220     configure_colors_string (setup_color_string);
 221     configure_colors_string (term_color_string);
 222     configure_colors_string (getenv ("MC_COLOR_TABLE"));
 223     configure_colors_string (command_line_colors);
 224 }
 225
 226 #ifndef HAVE_SLANG
 227 #define MAX_PAIRS 64
 228 int attr_pairs [MAX_PAIRS];
 229 #endif
 230
 231 static void
 232 load_dialog_colors (void)
 233 {
 234     dialog_colors [0] = COLOR_NORMAL;
 235     dialog_colors [1] = COLOR_FOCUS;
 236     dialog_colors [2] = COLOR_HOT_NORMAL;
 237     dialog_colors [3] = COLOR_HOT_FOCUS;
 238 }
 239
 240 void init_colors (void)
 241 {
 242     int i;
 243
 244     hascolors = has_colors ();
 245
 246     if (!disable_colors && hascolors){
 247         use_colors = 1;
 248     }
 249
 250     if (use_colors){
 251         start_color ();
 252         configure_colors ();
 253
 254 #ifndef HAVE_SLANG
 255         if (ELEMENTS (color_map) > MAX_PAIRS){
 256             /* This message should only be seen by the developers */
 257             fprintf (stderr,
 258                      "Too many defined colors, resize MAX_PAIRS on color.c");
 259             exit (1);
 260         }
 261 #endif /* !HAVE_SLANG */
 262
 263         if (use_colors) {
 264 #ifdef HAVE_SLANG
 265             /*
 266              * We are relying on undocumented feature of
 267              * S-Lang to make COLOR_PAIR(DEFAULT_COLOR_INDEX)
 268              * the default fg/bg of the terminal.
 269              * Hopefully, future versions of S-Lang will
 270              * document this feature.
 271              */
 272             SLtt_set_color (DEFAULT_COLOR_INDEX, NULL, "default", "default");
 273 #else
 274             /* Always white on black */
 275             mc_init_pair(DEFAULT_COLOR_INDEX, COLOR_WHITE, COLOR_BLACK);
 276 #endif /* !HAVE_SLANG */
 277         }
 278
 279         for (i = 0; i < ELEMENTS (color_map); i++){
 280             if (!color_map [i].name)
 281                 continue;
 282
 283             mc_init_pair (i+1, color_map_fg(i), color_map_bg(i));
 284
 285 #ifndef HAVE_SLANG
 286             /*
 287              * ncurses doesn't remember bold attribute in the color pairs,
 288              * so we should keep track of it in a separate array.
 289              */
 290              attr_pairs [i+1] = color_map [i].fg & A_BOLD;
 291 #endif /* !HAVE_SLANG */
 292         }
 293     }
 294     load_dialog_colors ();
 295 }
 296
 297 /* Functions necessary to implement syntax highlighting  */
 298
 299 static int max_index = 0;
 300
 301 static int
 302 alloc_color_pair (CTYPE foreground, CTYPE background)
 303 {
 304     mc_init_pair (++max_index, foreground, background);
 305     return max_index;
 306 }
 307
 308 static struct colors_avail {
 309     struct colors_avail *next;
 310     char *fg, *bg;
 311     int index;
 312 } c = { 0, 0, 0, 0 };
 313
 314 #ifdef HAVE_SLANG
 315 void
 316 mc_init_pair (int index, CTYPE foreground, CTYPE background)
 317 {
 318     /* hack for transparent background for Eterm, rxvt or else */
 319     if (background && !strcmp (background, "default"))
 320        background = NULL;
 321     /* if foreground is default, I guess we should use normal fore-color. */
 322
 323     SLtt_set_color (index, "", foreground, background);
 324     if (index > max_index)
 325         max_index = index;
 326 }
 327
 328 int
 329 try_alloc_color_pair (char *fg, char *bg)
 330 {
 331     struct colors_avail *p = &c;
 332
 333     c.index = EDITOR_NORMAL_COLOR_INDEX;
 334     for (;;) {
 335         if (((fg && p->fg) ? !strcmp (fg, p->fg) : fg == p->fg) != 0
 336             && ((bg && p->bg) ? !strcmp (bg, p->bg) : bg == p->bg) != 0)
 337             return p->index;
 338         if (!p->next)
 339             break;
 340         p = p->next;
 341     }
 342     p->next = g_new (struct colors_avail, 1);
 343     p = p->next;
 344     p->next = 0;
 345     p->fg = fg ? g_strdup (fg) : 0;
 346     p->bg = bg ? g_strdup (bg) : 0;
 347     if (!fg)
 348         /* Index in color_map array = COLOR_INDEX - 1 */
 349         fg = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].fg;
 350     if (!bg)
 351         bg = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].bg;
 352     p->index = alloc_color_pair (fg, bg);
 353     return p->index;
 354 }
 355
 356 #else /* !HAVE_SLANG */
 357 void
 358 mc_init_pair (int index, CTYPE foreground, CTYPE background)
 359 {
 360     init_pair (index, foreground, background);
 361     if (index > max_index)
 362         max_index = index;
 363 }
 364
 365 int
 366 try_alloc_color_pair (char *fg, char *bg)
 367 {
 368     int fg_index, bg_index;
 369     int bold_attr;
 370     struct colors_avail *p = &c;
 371
 372     c.index = EDITOR_NORMAL_COLOR_INDEX;
 373     for (;;) {
 374         if (((fg && p->fg) ? !strcmp (fg, p->fg) : fg == p->fg) != 0
 375             && ((bg && p->bg) ? !strcmp (bg, p->bg) : bg == p->bg) != 0)
 376             return p->index;
 377         if (!p->next)
 378             break;
 379         p = p->next;
 380     }
 381     p->next = g_new (struct colors_avail, 1);
 382     p = p->next;
 383     p->next = 0;
 384     p->fg = fg ? g_strdup (fg) : 0;
 385     p->bg = bg ? g_strdup (bg) : 0;
 386     if (!fg)
 387         /* Index in color_map array = COLOR_INDEX - 1 */
 388         fg_index = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].fg;
 389     else
 390         get_color (fg, &fg_index);
 391
 392     if (!bg)
 393         bg_index = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].bg;
 394     else
 395         get_color (bg, &bg_index);
 396
 397     bold_attr = fg_index & A_BOLD;
 398     fg_index = fg_index & COLOR_WHITE;
 399     bg_index = bg_index & COLOR_WHITE;
 400
 401     p->index = alloc_color_pair (fg_index, bg_index);
 402     attr_pairs [p->index] = bold_attr;
 403     return p->index;
 404 }
 405 #endif /* !HAVE_SLANG */
 406
 407 void
 408 dealloc_color_pairs (void)
 409 {
 410     struct colors_avail *p, *next;
 411
 412     for (p = c.next; p; p = next) {
 413         next = p->next;
 414         if (p->fg)
 415             g_free (p->fg);
 416         if (p->bg)
 417             g_free (p->bg);
 418         g_free (p);
 419     }
 420     c.next = NULL;
 421 }
 422