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Member "tin-2.4.4/src/color.c" (20 Nov 2019, 8781 Bytes) of package /linux/misc/tin-2.4.4.tar.xz:


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    1 /*
    2  *  Project   : tin - a Usenet reader
    3  *  Module    : color.c
    4  *  Original  : Olaf Kaluza <olaf@criseis.ruhr.de>
    5  *  Author    : Roland Rosenfeld <roland@spinnaker.rhein.de>
    6  *              Giuseppe De Marco <gdm@rebel.net> (light-colors)
    7  *              Julien Oster <fuzzy@cu8.cum.de> (word highlighting)
    8  *              T.Dickey <dickey@invisible-island.net> (curses support)
    9  *  Created   : 1995-06-02
   10  *  Updated   : 2015-10-09
   11  *  Notes     : This are the basic function for ansi-color
   12  *              and word highlighting
   13  *
   14  * Copyright (c) 1995-2020 Roland Rosenfeld <roland@spinnaker.rhein.de>
   15  * All rights reserved.
   16  *
   17  * Redistribution and use in source and binary forms, with or without
   18  * modification, are permitted provided that the following conditions
   19  * are met:
   20  *
   21  * 1. Redistributions of source code must retain the above copyright notice,
   22  *    this list of conditions and the following disclaimer.
   23  *
   24  * 2. Redistributions in binary form must reproduce the above copyright
   25  *    notice, this list of conditions and the following disclaimer in the
   26  *    documentation and/or other materials provided with the distribution.
   27  *
   28  * 3. Neither the name of the copyright holder nor the names of its
   29  *    contributors may be used to endorse or promote products derived from
   30  *    this software without specific prior written permission.
   31  *
   32  * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   33  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   34  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   35  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   36  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   37  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   38  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   39  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   40  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   41  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   42  * POSSIBILITY OF SUCH DAMAGE.
   43  */
   44 
   45 #ifndef TIN_H
   46 #   include "tin.h"
   47 #endif /* !TIN_H */
   48 #ifndef TCURSES_H
   49 #   include "tcurses.h"
   50 #endif /* !TCURSES_H */
   51 #ifndef included_trace_h
   52 #   include "trace.h"
   53 #endif /* !included_trace_h */
   54 
   55 #ifdef HAVE_COLOR
   56 
   57 #   define MIN_COLOR -1 /* -1 is default, otherwise 0-7 or 0-15 */
   58 
   59 int default_fcol = 7;
   60 int default_bcol = 0;
   61 
   62 #   ifdef USE_CURSES
   63     static int current_fcol = 7;
   64     static struct LIST {
   65         struct LIST *link;
   66         int pair;
   67         int fg;
   68         int bg;
   69     } *list;
   70 #   endif /* USE_CURSES */
   71 static int current_bcol = 0;
   72 
   73 
   74 /*
   75  * local prototypes
   76  */
   77 #   ifdef USE_CURSES
   78     static void set_colors(int fcolor, int bcolor);
   79 #   endif /* USE_CURSES */
   80 
   81 
   82 #   ifdef USE_CURSES
   83 static void
   84 set_colors(
   85     int fcolor,
   86     int bcolor)
   87 {
   88     static int nextpair;
   89 
   90 #       ifndef HAVE_USE_DEFAULT_COLORS
   91     if (fcolor < 0)
   92         fcolor = default_fcol;
   93     if (bcolor < 0)
   94         bcolor = default_bcol;
   95 #       endif /* !HAVE_USE_DEFAULT_COLORS */
   96     if (cmd_line || !use_color || !has_colors()) {
   97         current_fcol = default_fcol;
   98         current_bcol = default_bcol;
   99     } else if (COLORS > 1 && COLOR_PAIRS > 1) {
  100         chtype attribute = A_NORMAL;
  101         int pair = 0;
  102 
  103         TRACE(("set_colors(%d, %d)", fcolor, bcolor));
  104 
  105         /*
  106          * fcolor/bcolor may be negative, if we're using ncurses
  107          * function use_default_colors().
  108          */
  109         if (fcolor > COLORS - 1) {
  110             attribute |= A_BOLD;
  111             fcolor %= COLORS;
  112         }
  113         if (bcolor > 0)
  114             bcolor %= COLORS;
  115 
  116         if (fcolor != default_fcol || bcolor != default_bcol) {
  117             struct LIST *p;
  118             t_bool found = FALSE;
  119 
  120             for (p = list; p != NULL; p = p->link) {
  121                 if (p->fg == fcolor && p->bg == bcolor) {
  122                     found = TRUE;
  123                     break;
  124                 }
  125             }
  126             if (found) {
  127                 pair = p->pair;
  128             } else if (++nextpair < COLOR_PAIRS) {
  129                 p = my_malloc(sizeof(struct LIST));
  130                 p->fg = fcolor;
  131                 p->bg = bcolor;
  132                 p->pair = pair = nextpair;
  133                 p->link = list;
  134                 list = p;
  135                 init_pair(pair, fcolor, bcolor);
  136             } else {
  137                 pair = 0;
  138             }
  139         }
  140 
  141         bkgdset(attribute | COLOR_PAIR(pair) | ' ');
  142     }
  143 }
  144 
  145 
  146 void
  147 refresh_color(
  148     void)
  149 {
  150     set_colors(current_fcol, current_bcol);
  151 }
  152 
  153 
  154 void
  155 reset_color(
  156     void)
  157 {
  158     current_fcol = default_fcol;
  159     current_bcol = default_bcol;
  160     refresh_color();
  161 }
  162 
  163 
  164 void
  165 free_color_pair_arrays(
  166     void)
  167 {
  168     struct LIST *p, *q;
  169 
  170     for (p = list; p != NULL; p = q) {
  171         q = p->link;
  172         free(p);
  173     }
  174 }
  175 #   endif /* USE_CURSES */
  176 
  177 
  178 /* setting foreground-color */
  179 void
  180 fcol(
  181     int color)
  182 {
  183     if (color < MIN_COLOR || color > MAX_COLOR)
  184         color = default_fcol;
  185 
  186     TRACE(("fcol(%d) %s", color, txt_colors[color - MIN_COLOR]));
  187 
  188     if (use_color) {
  189 #   ifdef USE_CURSES
  190         set_colors(color, current_bcol);
  191         current_fcol = color;
  192 #   else
  193         int bold;
  194 
  195         if (cmd_line)
  196             return;
  197         if (color < 0)
  198             color = default_fcol;
  199         bold = (color >> 3); /* bitwise operation on signed value? ouch */
  200         my_printf("\033[%d;%dm", bold, ((color & 7) + 30));
  201         if (!bold)
  202             bcol(current_bcol);
  203 #   endif /* USE_CURSES */
  204     }
  205 #   ifdef USE_CURSES
  206     else
  207         set_colors(default_fcol, default_bcol);
  208 #   endif /* USE_CURSES */
  209 }
  210 
  211 
  212 /* setting background-color */
  213 void
  214 bcol(
  215     int color)
  216 {
  217     if (color < MIN_COLOR || color > MAX_COLOR)
  218         color = default_bcol;
  219 
  220     TRACE(("bcol(%d) %s", color, txt_colors[color - MIN_COLOR]));
  221 
  222     if (use_color) {
  223 #   ifdef USE_CURSES
  224         set_colors(current_fcol, color);
  225 #   else
  226         if (color < 0)
  227             color = default_bcol;
  228         my_printf("\033[%dm", (color + 40));
  229 #   endif /* USE_CURSES */
  230         current_bcol = color;
  231     }
  232 #   ifdef USE_CURSES
  233     else
  234         set_colors(default_fcol, default_bcol);
  235 #   endif /* USE_CURSES */
  236 }
  237 #endif /* HAVE_COLOR */
  238 
  239 
  240 /*
  241  * Output a line of text to the screen with colour if needed
  242  * word highlights, signatures etc will be highlighted
  243  */
  244 void
  245 draw_pager_line(
  246     const char *str,
  247     int flags,
  248     t_bool raw_data)
  249 {
  250 #ifdef HAVE_COLOR
  251     if (use_color) {
  252         if (flags & C_SIG) {
  253             fcol(tinrc.col_signature);
  254         } else if (flags & (C_HEADER | C_ATTACH | C_UUE)) {
  255             fcol(tinrc.col_newsheaders);
  256         } else { /* keep order in sync with cook.c:process_text_body_part() */
  257             if (flags & C_VERBATIM) {
  258                 fcol(tinrc.col_verbatim);
  259             } else if (flags & C_QUOTE3) {
  260                 fcol(tinrc.col_quote3);
  261             } else if (flags & C_QUOTE2) {
  262                 fcol(tinrc.col_quote2);
  263             } else if (flags & C_EXTQUOTE) {
  264                 fcol(tinrc.col_extquote);
  265             } else if (flags & C_QUOTE1) {
  266                 fcol(tinrc.col_quote);
  267             } else
  268                 fcol(tinrc.col_text);
  269         }
  270     }
  271 #endif /* HAVE_COLOR */
  272 
  273     if (!raw_data) {
  274 #if defined(HAVE_LIBICUUC) && defined(MULTIBYTE_ABLE) && defined(HAVE_UNICODE_UBIDI_H) && !defined(NO_LOCALE)
  275         /*
  276          * BiDi support
  277          */
  278         /* don't run it on empty lines and lines containing only one char (which must be an ASCII one) */
  279         if (tinrc.render_bidi && IS_LOCAL_CHARSET("UTF-8") && strlen(str) > 1) {
  280             char *line;
  281             t_bool is_rtl;
  282 
  283             if ((line = render_bidi(str, &is_rtl)) != NULL) {
  284                 if (is_rtl) { /* RTL */
  285                     /* determine visual length and pad out so that line is right-aligned */
  286                     wchar_t *wline;
  287 
  288                     if ((wline = char2wchar_t(line)) != NULL) {
  289                         int visual_len;
  290 
  291                         wconvert_to_printable(wline, FALSE);
  292                         visual_len = wcswidth(wline, wcslen(wline) + 1);
  293                         free(wline);
  294 
  295                         if (visual_len > 0) {
  296                             int i;
  297 
  298                             for (i = 0; i < cCOLS - visual_len - 1; i++)
  299                                 my_fputc(' ', stdout);
  300                         }
  301                         my_fputs(line, stdout);
  302                     } else /* fallback */
  303                         my_fputs(line, stdout);
  304 
  305                 } else  /* LTR */
  306                     my_fputs(line, stdout);
  307 
  308                 free(line);
  309             } else
  310                 my_fputs(str, stdout);
  311         } else
  312 #endif /* HAVE_LIBICUUC && MULTIBYTE_ABLE && HAVE_UNICODE_UBIDI_H && !NO_LOCALE */
  313             my_fputs(str, stdout);
  314     } else {
  315         /* in RAW-mode (show_all_headers) display non-printable chars as octals */
  316         const char *c;
  317         char octal[5];
  318 
  319         c = str;
  320         while (*c) {
  321 #if defined(MULTIBYTE_ABLE) && !defined(NO_LOCALE)
  322             int num_bytes;
  323             wchar_t wc;
  324 
  325             num_bytes = mbtowc(&wc, c, MB_CUR_MAX);
  326             if (num_bytes != -1 && iswprint(wc)) {
  327                 my_fputwc((wint_t) wc, stdout);
  328                 c += num_bytes;
  329             }
  330 #else
  331             if (my_isprint((unsigned char) *c)) {
  332                 my_fputc((int) *c, stdout);
  333                 c++;
  334             }
  335 #endif /* MULTIBYTE_ABLE && !NO_LOCALE */
  336             else if (IS_LOCAL_CHARSET("Big5") && (unsigned char) *c >= 0xa1 && (unsigned char) *c <= 0xfe && *(c + 1)) {
  337                 /*
  338                  * Big5: ASCII chars are handled by the normal code
  339                  * check only for 2-byte chars
  340                  * TODO: should we also check if the second byte is also valid?
  341                  */
  342                 my_fputc((int) *c, stdout);
  343                 c++;
  344                 my_fputc((int) *c, stdout);
  345                 c++;
  346             } else {
  347                 /*
  348                  * non-printable char
  349                  * print as an octal value
  350                  */
  351                 snprintf(octal, sizeof(octal), "\\%03o", (unsigned int) (*c & 0xff));
  352                 my_fputs(octal, stdout);
  353                 c++;
  354             }
  355         }
  356     }
  357 
  358 #ifndef USE_CURSES
  359     my_fputs(cCRLF, stdout);
  360 #endif /* !USE_CURSES */
  361 }