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     char *name;                 /* Name of the entry */
  48     CTYPE fg;                   /* foreground color */
  49     CTYPE bg;                   /* background color */
  50 };
  51
  52 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
 101 struct color_table_s {
 102     char *name;
 103     int  value;
 104 };
 105
 106
 107 static struct color_table_s const color_table [] = {
 108     { "black",         COLOR_BLACK   },
 109     { "gray",          COLOR_BLACK   | A_BOLD },
 110     { "red",           COLOR_RED     },
 111     { "brightred",     COLOR_RED     | A_BOLD },
 112     { "green",         COLOR_GREEN   },
 113     { "brightgreen",   COLOR_GREEN   | A_BOLD },
 114     { "brown",         COLOR_YELLOW  },
 115     { "yellow",        COLOR_YELLOW  | A_BOLD },
 116     { "blue",          COLOR_BLUE    },
 117     { "brightblue",    COLOR_BLUE    | A_BOLD },
 118     { "magenta",       COLOR_MAGENTA },
 119     { "brightmagenta", COLOR_MAGENTA | A_BOLD },
 120     { "cyan",          COLOR_CYAN    },
 121     { "brightcyan",    COLOR_CYAN    | A_BOLD },
 122     { "lightgray",     COLOR_WHITE },
 123     { "white",         COLOR_WHITE   | A_BOLD },
 124     { "default",       0 } /* hack for transparent background */
 125 };
 126
 127 #ifdef HAVE_SLANG
 128 #   define color_value(i) color_table [i].name
 129 #   define color_name(i)  color_table [i].name
 130 #else
 131 #   define color_value(i) color_table [i].value
 132 #   define color_name(i)  color_table [i].name
 133 #endif
 134
 135 static void get_color (char *cpp, CTYPE *colp)
 136 {
 137     int i;
 138
 139     for (i = 0; i < ELEMENTS(color_table); i++){
 140         if (strcmp (cpp, color_name (i)) == 0){
 141             *colp = color_value (i);
 142             return;
 143         }
 144     }
 145 }
 146
 147 static void get_two_colors (char **cpp, struct colorpair *colorpairp)
 148 {
 149     char *p = *cpp;
 150     int state;
 151
 152     state = 0;
 153
 154     for (; *p; p++){
 155         if (*p == ':'){
 156             *p = 0;
 157             get_color (*cpp, state ? &colorpairp->bg : &colorpairp->fg);
 158             *p = ':';
 159             *cpp = p + 1;
 160             return;
 161         }
 162
 163         if (*p == ','){
 164             state = 1;
 165             *p = 0;
 166             get_color (*cpp, &colorpairp->fg);
 167             *p = ',';
 168             *cpp = p + 1;
 169         }
 170     }
 171     get_color (*cpp, state ? &colorpairp->bg : &colorpairp->fg);
 172 }
 173
 174 static void configure_colors_string (char *the_color_string)
 175 {
 176     char *color_string, *p;
 177     int  i, found;
 178
 179     if (!the_color_string)
 180         return;
 181
 182     p = color_string = g_strdup (the_color_string);
 183     while (color_string && *color_string){
 184         while (*color_string == ' ' || *color_string == '\t')
 185             color_string++;
 186
 187         found = 0;
 188         for (i = 0; i < ELEMENTS(color_map); i++){
 189             int klen;
 190
 191             if (!color_map [i].name)
 192                 continue;
 193             klen = strlen (color_map [i].name);
 194
 195             if (strncmp (color_string, color_map [i].name, klen) == 0){
 196                 color_string += klen;
 197                 get_two_colors (&color_string, &color_map [i]);
 198                 found = 1;
 199             }
 200         }
 201         if (!found){
 202                 while (*color_string && *color_string != ':')
 203                         color_string++;
 204                 if (*color_string)
 205                         color_string++;
 206         }
 207     }
 208    g_free (p);
 209 }
 210
 211 static void configure_colors (void)
 212 {
 213     extern char *command_line_colors;
 214     extern char *default_edition_colors;
 215
 216     configure_colors_string (default_edition_colors);
 217     configure_colors_string (setup_color_string);
 218     configure_colors_string (term_color_string);
 219     configure_colors_string (getenv ("MC_COLOR_TABLE"));
 220     configure_colors_string (command_line_colors);
 221 }
 222
 223 #ifndef HAVE_SLANG
 224 #define MAX_PAIRS 64
 225 int attr_pairs [MAX_PAIRS];
 226 #endif
 227
 228 static void
 229 load_dialog_colors (void)
 230 {
 231     dialog_colors [0] = COLOR_NORMAL;
 232     dialog_colors [1] = COLOR_FOCUS;
 233     dialog_colors [2] = COLOR_HOT_NORMAL;
 234     dialog_colors [3] = COLOR_HOT_FOCUS;
 235
 236     alarm_colors [0] = ERROR_COLOR;
 237     alarm_colors [1] = REVERSE_COLOR;
 238     alarm_colors [2] = ERROR_COLOR;
 239     alarm_colors [3] = COLOR_HOT_NORMAL;
 240 }
 241
 242 void init_colors (void)
 243 {
 244     int i;
 245
 246     int hascolors;
 247
 248     /* FIXME: if S-Lang is used, this function must be called regardless
 249        of whether we are interested in its result */
 250     hascolors = has_colors ();
 251
 252     if (!disable_colors && hascolors){
 253         use_colors = 1;
 254     }
 255
 256     if (use_colors){
 257         start_color ();
 258         configure_colors ();
 259
 260 #ifndef HAVE_SLANG
 261         if (ELEMENTS (color_map) > MAX_PAIRS){
 262             /* This message should only be seen by the developers */
 263             fprintf (stderr,
 264                      "Too many defined colors, resize MAX_PAIRS on color.c");
 265             exit (1);
 266         }
 267 #endif /* !HAVE_SLANG */
 268
 269         if (use_colors) {
 270 #ifdef HAVE_SLANG
 271             /*
 272              * We are relying on undocumented feature of
 273              * S-Lang to make COLOR_PAIR(DEFAULT_COLOR_INDEX)
 274              * the default fg/bg of the terminal.
 275              * Hopefully, future versions of S-Lang will
 276              * document this feature.
 277              */
 278             SLtt_set_color (DEFAULT_COLOR_INDEX, NULL, "default", "default");
 279 #else
 280             /* Always white on black */
 281             mc_init_pair(DEFAULT_COLOR_INDEX, COLOR_WHITE, COLOR_BLACK);
 282 #endif /* !HAVE_SLANG */
 283         }
 284
 285         for (i = 0; i < ELEMENTS (color_map); i++){
 286             if (!color_map [i].name)
 287                 continue;
 288
 289             mc_init_pair (i+1, color_map_fg(i), color_map_bg(i));
 290
 291 #ifndef HAVE_SLANG
 292             /*
 293              * ncurses doesn't remember bold attribute in the color pairs,
 294              * so we should keep track of it in a separate array.
 295              */
 296              attr_pairs [i+1] = color_map [i].fg & A_BOLD;
 297 #endif /* !HAVE_SLANG */
 298         }
 299     }
 300     load_dialog_colors ();
 301 }
 302
 303 /* Functions necessary to implement syntax highlighting  */
 304
 305 static int max_index = 0;
 306
 307 static int
 308 alloc_color_pair (CTYPE foreground, CTYPE background)
 309 {
 310     mc_init_pair (++max_index, foreground, background);
 311     return max_index;
 312 }
 313
 314 static struct colors_avail {
 315     struct colors_avail *next;
 316     char *fg, *bg;
 317     int index;
 318 } c = { 0, 0, 0, 0 };
 319
 320 #ifdef HAVE_SLANG
 321 void
 322 mc_init_pair (int index, CTYPE foreground, CTYPE background)
 323 {
 324     /* hack for transparent background for Eterm, rxvt or else */
 325     if (background && !strcmp (background, "default"))
 326        background = NULL;
 327     /* if foreground is default, I guess we should use normal fore-color. */
 328
 329     SLtt_set_color (index, "", foreground, background);
 330     if (index > max_index)
 331         max_index = index;
 332 }
 333
 334 int
 335 try_alloc_color_pair (char *fg, char *bg)
 336 {
 337     struct colors_avail *p = &c;
 338
 339     c.index = EDITOR_NORMAL_COLOR_INDEX;
 340     for (;;) {
 341         if (((fg && p->fg) ? !strcmp (fg, p->fg) : fg == p->fg) != 0
 342             && ((bg && p->bg) ? !strcmp (bg, p->bg) : bg == p->bg) != 0)
 343             return p->index;
 344         if (!p->next)
 345             break;
 346         p = p->next;
 347     }
 348     p->next = g_new (struct colors_avail, 1);
 349     p = p->next;
 350     p->next = 0;
 351     p->fg = fg ? g_strdup (fg) : 0;
 352     p->bg = bg ? g_strdup (bg) : 0;
 353     if (!fg)
 354         /* Index in color_map array = COLOR_INDEX - 1 */
 355         fg = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].fg;
 356     if (!bg)
 357         bg = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].bg;
 358     p->index = alloc_color_pair (fg, bg);
 359     return p->index;
 360 }
 361
 362 #else /* !HAVE_SLANG */
 363 void
 364 mc_init_pair (int index, CTYPE foreground, CTYPE background)
 365 {
 366     init_pair (index, foreground, background);
 367     if (index > max_index)
 368         max_index = index;
 369 }
 370
 371 int
 372 try_alloc_color_pair (char *fg, char *bg)
 373 {
 374     int fg_index, bg_index;
 375     int bold_attr;
 376     struct colors_avail *p = &c;
 377
 378     c.index = EDITOR_NORMAL_COLOR_INDEX;
 379     for (;;) {
 380         if (((fg && p->fg) ? !strcmp (fg, p->fg) : fg == p->fg) != 0
 381             && ((bg && p->bg) ? !strcmp (bg, p->bg) : bg == p->bg) != 0)
 382             return p->index;
 383         if (!p->next)
 384             break;
 385         p = p->next;
 386     }
 387     p->next = g_new (struct colors_avail, 1);
 388     p = p->next;
 389     p->next = 0;
 390     p->fg = fg ? g_strdup (fg) : 0;
 391     p->bg = bg ? g_strdup (bg) : 0;
 392     if (!fg)
 393         /* Index in color_map array = COLOR_INDEX - 1 */
 394         fg_index = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].fg;
 395     else
 396         get_color (fg, &fg_index);
 397
 398     if (!bg)
 399         bg_index = color_map[EDITOR_NORMAL_COLOR_INDEX - 1].bg;
 400     else
 401         get_color (bg, &bg_index);
 402
 403     bold_attr = fg_index & A_BOLD;
 404     fg_index = fg_index & COLOR_WHITE;
 405     bg_index = bg_index & COLOR_WHITE;
 406
 407     p->index = alloc_color_pair (fg_index, bg_index);
 408     attr_pairs [p->index] = bold_attr;
 409     return p->index;
 410 }
 411 #endif /* !HAVE_SLANG */
 412
 413 void
 414 dealloc_color_pairs (void)
 415 {
 416     struct colors_avail *p, *next;
 417
 418     for (p = c.next; p; p = next) {
 419         next = p->next;
 420         if (p->fg)
 421             g_free (p->fg);
 422         if (p->bg)
 423             g_free (p->bg);
 424         g_free (p);
 425     }
 426     c.next = NULL;
 427 }
 428