abook_rl.c

   1 /*
   2  * $Id$
   3  *
   4  * by JH <jheinonen@users.sourceforge.net>
   5  *
   6  * Copyright (C) Jaakko Heinonen
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <sys/types.h>
  12 #include "abook.h"
  13 #include "abook_rl.h"
  14
  15 #ifdef HAVE_CONFIG_H
  16 #       include "config.h"
  17 #endif
  18
  19 #if defined(HAVE_READLINE_READLINE_H)
  20 #       include <readline/readline.h>
  21 #elif defined(HAVE_READLINE_H)
  22 #       include <readline.h>
  23 #else
  24 #       error "You don't seem to have readline.h"
  25 #       error "No HAVE_READLINE_READLINE_H or HAVE_READLINE_H defined"
  26 #endif
  27
  28 #if defined(HAVE_READLINE_HISTORY_H)
  29 #       include <readline/history.h>
  30 #elif defined(HAVE_HISTORY_H)
  31 #       include <history.h>
  32 #else
  33 #       error "You don't seem to have history.h"
  34 #       error "No HAVE_READLINE_HISTORY_H or HAVE_HISTORY_H defined"
  35 #endif
  36
  37 #ifdef HANDLE_MULTIBYTE
  38 #       include <mbswidth.h>
  39 #endif
  40
  41 #define RL_READLINE_NAME        "Abook"
  42
  43 static int rl_x, rl_y;
  44 static WINDOW *rl_win;
  45
  46 static bool rl_cancelled;
  47
  48 static void
  49 rl_refresh()
  50 {
  51         /* refresh(); */
  52         wrefresh(rl_win);
  53 }
  54
  55 #ifdef HANDLE_MULTIBYTE
  56 static int
  57 rline_calc_point()
  58 {
  59         return (int)mbsnwidth(rl_line_buffer, rl_point, 0);
  60 }
  61 #endif
  62
  63 static void
  64 rline_update()
  65 {
  66 #ifdef HANDLE_MULTIBYTE
  67         int real_point = rline_calc_point() + rl_x;
  68 #else
  69         int real_point = rl_point + rl_x;
  70 #endif
  71
  72         if(real_point > (COLS - 1))
  73                 mvwaddnstr(rl_win, rl_y, rl_x,
  74                         rl_line_buffer + (1 + real_point - COLS),
  75                         COLS - rl_x - 1);
  76         else
  77                 mvwaddnstr(rl_win, rl_y, rl_x, rl_line_buffer, rl_end);
  78
  79         wclrtoeol(rl_win);
  80         wmove(rl_win, rl_y, min(real_point, COLS - 1));
  81
  82         rl_refresh();
  83 }
  84
  85 static void
  86 rline_compdisp(char **matches, int n, int max_len)
  87 {
  88         /* dummy */
  89 }
  90
  91 static void
  92 rline_prep_terminal(int dummy)
  93 {
  94 #if (RL_VERSION_MAJOR == 4 && RL_VERSION_MINOR > 2) || (RL_VERSION_MAJOR > 4)
  95         /* nothing */
  96 #else
  97         /*
  98          * #warning is an extension. Not all compilers support it.
  99          */
 100 #       ifdef __GNUC__
 101 #               warning "You seem to have rather old readline version or \
 102 non-GNU version of it. If you have problems please use \
 103 GNU readline 4.3 or newer. \
 104 GNU readline versions 4.0, 4.1 and 4.2 should be OK despite \
 105 of this warning."
 106 #       endif
 107         /*
 108          * this kludge avoids older readline libraries to print a newline
 109          */
 110         extern int readline_echoing_p;
 111         readline_echoing_p = 0;
 112 #endif
 113         raw();
 114         keypad(rl_win, FALSE);
 115 }
 116
 117 static void
 118 rline_deprep_terminal(void)
 119 {
 120         cbreak();
 121         keypad(rl_win, TRUE);
 122 }
 123
 124 static int
 125 rl_cancel(int dummy1, int dummy2)
 126 {
 127         rl_cancelled = TRUE;
 128
 129         rl_done = 1;
 130
 131         return 0;
 132 }
 133
 134 static void
 135 abook_rl_init(bool use_completion)
 136 {
 137         rl_readline_name = RL_READLINE_NAME;
 138
 139 #if RL_VERSION_MAJOR >= 4
 140         rl_already_prompted = 1;
 141 #endif
 142         rl_catch_sigwinch = 0;
 143         rl_erase_empty_line = 0;
 144
 145         rl_redisplay_function = rline_update;
 146         rl_completion_display_matches_hook = rline_compdisp;
 147         rl_prep_term_function = rline_prep_terminal;
 148         rl_deprep_term_function = rline_deprep_terminal;
 149
 150         rl_unbind_function_in_map(rl_clear_screen, rl_get_keymap());
 151         rl_unbind_function_in_map(rl_reverse_search_history, rl_get_keymap());
 152         rl_unbind_function_in_map(rl_re_read_init_file, rl_get_keymap());
 153
 154         if(use_completion) {
 155                 rl_bind_key('\t', rl_menu_complete);
 156         } else {
 157                 rl_unbind_function_in_map(rl_complete, rl_get_keymap());
 158                 rl_unbind_function_in_map(rl_menu_complete, rl_get_keymap());
 159         }
 160
 161         rl_bind_key('g' & 31, rl_cancel); /* C-g */
 162
 163         clear_history();
 164
 165         rl_cancelled = FALSE;
 166 }
 167
 168 char *
 169 abook_readline(WINDOW *w, int y, int x, char *s, bool use_completion)
 170 {
 171         char *ret;
 172
 173         abook_rl_init(use_completion);
 174
 175         wmove(rl_win = w, rl_y = y, rl_x = x);
 176         rl_refresh();
 177
 178         if(s && *s)
 179                 add_history(s);
 180
 181         ret = readline(NULL);
 182
 183         if(rl_cancelled && ret) {
 184                 free(ret);
 185                 ret = NULL;
 186         }
 187
 188         return ret;
 189 }
 190