/* vi_mode.c -- A vi emulation mode for Bash.

  Derived from code written by Jeff Sparkes (jeff1@????).
*/


/* **************************************************************** */
/*                                                                  */
/*                      VI Emulation Mode                           */
/*                                                                  */
/* **************************************************************** */

/* Last string searched for from `/' or `?'. */
static char *vi_last_search = (char *)NULL;
static int vi_histpos;

/* Non-zero means enter insertion mode. */
int vi_doing_insert = 0;

/* *** UNCLEAN *** */
/* Command keys which do movement for xxx_to commands. */
static char *vi_motion = " hl^$0ftFt;,%wbeWBE|";

/* Keymap used for vi replace characters.  Created dynamically since
  rarely used. */
static Keymap vi_replace_map = (Keymap)NULL;

/* The number of characters inserted in the last replace operation. */
static vi_replace_count = 0;

/* Yank the nth arg from the previous line into this line at point. */
rl_vi_yank_arg (count)
    int count;
{
 rl_yank_nth_arg (count, 0);
}

/* Search again for the last thing searched for. */
rl_vi_search_again (ignore, key)
    int ignore, key;
{
 switch (key)
   {
   case 'n':
     rl_vi_dosearch (vi_last_search, -1);
     break;

   case 'N':
     rl_vi_dosearch (vi_last_search, 1);
     break;
   }
}

/* Do a vi style search. */
rl_vi_search (count, key)
    int count, key;
{
 int dir, c, save_pos;
 char *p;

 switch (key)
   {
   case '?':
     dir = 1;
     break;

   case '/':
     dir = -1;
     break;

   default:
     ding ();
     return;
   }

 vi_histpos = where_history ();
 maybe_save_line ();
 save_pos = rl_point;

 /* Reuse the line input buffer to read the search string. */
 the_line[0] = 0;
 rl_end = rl_point = 0;
 p = (char *)alloca (2 + (rl_prompt ? strlen (rl_prompt) : 0));

 sprintf (p, "%s%c", rl_prompt ? rl_prompt : "", key);

 rl_message (p, 0, 0);

 while (c = rl_read_key ())
   {
     switch (c)
       {
       case CTRL('H'):
       case RUBOUT:
         if (rl_point == 0)
           {
             maybe_unsave_line ();
             rl_clear_message ();
             rl_point = save_pos;
             return;
           }

       case CTRL('W'):
       case CTRL('U'):
         rl_dispatch (c, keymap);
         break;

       case ESC:
       case RETURN:
       case NEWLINE:
         goto dosearch;
         break;

       case CTRL('C'):
         maybe_unsave_line ();
         rl_clear_message ();
         rl_point = 0;
         ding ();
         return;

       default:
         rl_insert (1, c);
         break;
       }
     rl_redisplay ();
   }
dosearch:
 if (vi_last_search)
   free (vi_last_search);

 vi_last_search = savestring (the_line);
 rl_vi_dosearch (the_line, dir);
}

rl_vi_dosearch (string, dir)
    char *string;
    int dir;
{
 int old, save = vi_histpos;
 HIST_ENTRY *h;

 if (string == 0 || *string == 0 || vi_histpos < 0)
   {
     ding ();
     return;
   }

 if ((save = history_search_pos (string, dir, vi_histpos + dir)) == -1)
   {
     maybe_unsave_line ();
     rl_clear_message ();
     rl_point = 0;
     ding ();
     return;
   }

 vi_histpos = save;

 old = where_history ();
 history_set_pos (vi_histpos);
 h = current_history ();
 history_set_pos (old);

 strcpy (the_line, h->line);
 rl_undo_list = (UNDO_LIST *)h->data;
 rl_end = strlen (the_line);
 rl_point = 0;
 rl_clear_message ();
}

/* Completion, from vi's point of view. */
rl_vi_complete (ignore, key)
    int ignore, key;
{
 if ((rl_point < rl_end) && (!whitespace (the_line[rl_point])))
   {
     if (!whitespace (the_line[rl_point + 1]))
       rl_vi_end_word (1, 'E');
     rl_point++;
   }

 if (key == '*')
   rl_complete_internal ('*');
 else
   rl_complete (0, key);

 rl_vi_insertion_mode ();
}

/* Previous word in vi mode. */
rl_vi_prev_word (count, key)
    int count, key;
{
 if (count < 0)
   {
     rl_vi_next_word (-count, key);
     return;
   }

 if (uppercase_p (key))
   rl_vi_bWord (count);
 else
   rl_vi_bword (count);
}

/* Next word in vi mode. */
rl_vi_next_word (count, key)
    int count;
{
 if (count < 0)
   {
     rl_vi_prev_word (-count, key);
     return;
   }

 if (uppercase_p (key))
   rl_vi_fWord (count);
 else
   rl_vi_fword (count);
}

/* Move to the end of the ?next? word. */
rl_vi_end_word (count, key)
    int count, key;
{
 if (count < 0)
   {
     ding ();
     return;
   }

 if (uppercase_p (key))
   rl_vi_eWord (count);
 else
   rl_vi_eword (count);
}

/* Move forward a word the way that 'W' does. */
/* Move forward a word the way that 'W' does. */
rl_vi_fWord (count)
    int count;
{
 while (count-- && rl_point < (rl_end - 1))
   {
     /* Skip until whitespace. */
     while (!whitespace (the_line[rl_point]) && rl_point < rl_end)
       rl_point++;

     /* Now skip whitespace. */
     while (whitespace (the_line[rl_point]) && rl_point < rl_end)
       rl_point++;
   }
}

rl_vi_bWord (count)
    int count;
{
 while (count-- && rl_point > 0)
   {
     /* If we are at the start of a word, move back to whitespace so
        we will go back to the start of the previous word. */
     if (!whitespace (the_line[rl_point]) &&
         whitespace (the_line[rl_point - 1]))
       rl_point--;

     while (rl_point > 0 && whitespace (the_line[rl_point]))
       rl_point--;

     if (rl_point > 0)
       {
         while (--rl_point >= 0 && !whitespace (the_line[rl_point]));
         rl_point++;
       }
   }
}

rl_vi_eWord (count)
    int count;
{
 while (count-- && rl_point < (rl_end - 1))
   {
     /* Move to white space. */
     while (++rl_point < rl_end && whitespace (the_line[rl_point]))
       ;

     if (rl_point && rl_point < rl_end)
       {
         /* Skip whitespace. */
         while (rl_point < rl_end && whitespace (the_line[rl_point]))
           rl_point++;

         /* Skip until whitespace. */
         while (rl_point < rl_end && !whitespace (the_line[rl_point]))
           rl_point++;

         /* Move back to the last character of the word. */
         rl_point--;
       }
   }
}

rl_vi_fword (count)
    int count;
{
 while (count-- && rl_point < (rl_end - 1))
   {
     /* Move to white space (really non-identifer). */
     if (isident (the_line[rl_point]))
       {
         while (isident (the_line[rl_point]) && rl_point < rl_end)
           rl_point++;
       }
     else /* if (!whitespace (the_line[rl_point])) */
       {
         while (!isident (the_line[rl_point]) &&
                !whitespace (the_line[rl_point]) && rl_point < rl_end)
           rl_point++;
       }

     /* Move past whitespace. */
     while (whitespace (the_line[rl_point]) && rl_point < rl_end)
       rl_point++;
   }
}

rl_vi_bword (count)
    int count;
{
 while (count-- && rl_point > 0)
   {
     int last_is_ident;

     /* If we are at the start of a word, move back to a non-identifier
        so we will go back to the start of the previous word. */
     if (isident (the_line[rl_point]) && !isident (the_line[rl_point - 1]))
       rl_point--;

     /* If this character and the previous character are `opposite', move
        back so we don't get messed up by the rl_point++ down there in
        the while loop.  Without this code, words like `l;' screw up the
        function. */
     last_is_ident = isident (the_line[rl_point - 1]);
     if ((isident (the_line[rl_point]) && !last_is_ident) ||
         (!isident (the_line[rl_point]) && last_is_ident))
       rl_point--;

     while (rl_point > 0 && whitespace (the_line[rl_point]))
       rl_point--;

     if (rl_point > 0)
       {
         if (isident (the_line[rl_point]))
           while (--rl_point >= 0 && isident (the_line[rl_point]));
         else
           while (--rl_point >= 0 && !isident (the_line[rl_point]) &&
                  !whitespace (the_line[rl_point]));
         rl_point++;
       }
   }
}

rl_vi_eword (count)
    int count;
{
 while (count-- && rl_point < rl_end - 1)
   {
     while (++rl_point < rl_end && whitespace (the_line[rl_point]))
       ;

     if (rl_point < rl_end)
       {
         if (isident (the_line[rl_point]))
           while (++rl_point < rl_end && isident (the_line[rl_point]));
         else
           while (++rl_point < rl_end && !isident (the_line[rl_point])
                  && !whitespace (the_line[rl_point]));
         rl_point--;
       }
   }
}

rl_vi_insert_beg ()
{
 rl_beg_of_line ();
 rl_vi_insertion_mode ();
 return 0;
}

rl_vi_append_mode ()
{
 if (rl_point < rl_end)
   rl_point += 1;
 rl_vi_insertion_mode ();
 return 0;
}

rl_vi_append_eol ()
{
 rl_end_of_line ();
 rl_vi_append_mode ();
 return 0;
}

/* What to do in the case of C-d. */
rl_vi_eof_maybe (count, c)
    int count, c;
{
 rl_newline (1, '\n');
}

/* Insertion mode stuff. */

/* Switching from one mode to the other really just involves
  switching keymaps. */
rl_vi_insertion_mode ()
{
 keymap = vi_insertion_keymap;
}

rl_vi_movement_mode ()
{
 if (rl_point > 0)
   rl_backward (1);

 keymap = vi_movement_keymap;
 vi_done_inserting ();
}

vi_done_inserting ()
{
 if (vi_doing_insert)
   {
     rl_end_undo_group ();
     vi_doing_insert = 0;
   }
}

rl_vi_arg_digit (count, c)
    int count, c;
{
 if (c == '0' && rl_numeric_arg == 1 && !rl_explicit_arg)
   rl_beg_of_line ();
 else
   rl_digit_argument (count, c);
}

/* Doesn't take an arg count in vi */
rl_vi_change_case (ignore1, ignore2)
    int ignore1, ignore2;
{
 char c = 0;

 /* Don't try this on an empty line. */
 if (rl_point >= rl_end - 1)
   return;

 if (uppercase_p (the_line[rl_point]))
   c = to_lower (the_line[rl_point]);
 else if (lowercase_p (the_line[rl_point]))
   c = to_upper (the_line[rl_point]);

 /* Vi is kind of strange here. */
 if (c)
   {
     rl_begin_undo_group ();
     rl_delete (1, c);
     rl_insert (1, c);
     rl_end_undo_group ();
     rl_vi_check ();
   }
 else
   rl_forward (1);
}

rl_vi_put (count, key)
    int count, key;
{
 if (!uppercase_p (key) && (rl_point + 1 <= rl_end))
   rl_forward (1);

 rl_yank ();
 rl_backward (1);
}

rl_vi_check ()
{
 if (rl_point && rl_point == rl_end)
   rl_point--;
}

rl_vi_column (count)
{
 if (count > rl_end)
   rl_end_of_line ();
 else
   rl_point = count - 1;
}

int
rl_vi_domove (key, nextkey)
    int key, *nextkey;
{
 int c, save;

 rl_mark = rl_point;
 c = rl_read_key ();
 *nextkey = c;

 if (!member (c, vi_motion))
   {
     if (digit (c))
       {
         save = rl_numeric_arg;
         rl_digit_loop1 ();
         rl_numeric_arg *= save;
       }
     else if ((key == 'd' && c == 'd') ||
              (key == 'c' && c == 'c'))
       {
         rl_mark = rl_end;
         rl_beg_of_line ();
         return (0);
       }
     else
       return (-1);
   }

 rl_dispatch (c, keymap);

 /* No change in position means the command failed. */
 if (rl_mark == rl_point)
   return (-1);

 if ((c == 'w' || c == 'W') && rl_point < rl_end)
   rl_point--;

 if (rl_mark < rl_point)
   exchange (rl_point, rl_mark);

 return (0);
}

/* A simplified loop for vi. Don't dispatch key at end.
  Don't recognize minus sign? */
rl_digit_loop1 ()
{
 int key, c;

 while (1)
   {
     rl_message ("(arg: %d) ", arg_sign * rl_numeric_arg, 0);
     key = c = rl_read_key ();

     if (keymap[c].type == ISFUNC &&
         keymap[c].function == rl_universal_argument)
       {
         rl_numeric_arg *= 4;
         continue;
       }

     c = UNMETA (c);
     if (numeric (c))
       {
         if (rl_explicit_arg)
           rl_numeric_arg = (rl_numeric_arg * 10) + (c - '0');
         else
           rl_numeric_arg = (c - '0');
         rl_explicit_arg = 1;
       }
     else
       {
         rl_clear_message ();
         rl_stuff_char (key);
         break;
       }
   }
}

rl_vi_delete_to (count, key)
    int count, key;
{
 int c;

 if (uppercase_p (key))
   rl_stuff_char ('$');

 if (rl_vi_domove (key, &c))
   {
     ding ();
     return;
   }

 if ((c != '|') && (c != 'h') && rl_mark < rl_end)
   rl_mark++;

 rl_kill_text (rl_point, rl_mark);
}

rl_vi_change_to (count, key)
    int count, key;
{
 int c;

 if (uppercase_p (key))
   rl_stuff_char ('$');

 if (rl_vi_domove (key, &c))
   {
     ding ();
     return;
   }

 if ((c != '|') && (c != 'h') && rl_mark < rl_end)
   rl_mark++;

 rl_begin_undo_group ();
 vi_doing_insert = 1;
 rl_kill_text (rl_point, rl_mark);
 rl_vi_insertion_mode ();
}

rl_vi_yank_to (count, key)
    int count, key;
{
 int c, save = rl_point;

 if (uppercase_p (key))
   rl_stuff_char ('$');

 if (rl_vi_domove (key, &c))
   {
     ding ();
     return;
   }

 rl_begin_undo_group ();
 rl_kill_text (rl_point, rl_mark);
 rl_end_undo_group ();
 rl_do_undo ();
 rl_point = save;
}

rl_vi_delete (count)
{
 int end;

 if (rl_end == 0)
   {
     ding ();
     return;
   }

 end = rl_point + count;

 if (end >= rl_end)
   end = rl_end;

 rl_kill_text (rl_point, end);

 if (rl_point > 0 && rl_point == rl_end)
   rl_backward (1);
}

/* Turn the current line into a comment in shell history.
  A K*rn shell style function. */
rl_vi_comment ()
{
 rl_beg_of_line ();
 rl_insert_text (": ");        /* `#' doesn't work in interactive mode */
 rl_redisplay ();
 rl_newline (1, '\010');
}

rl_vi_first_print ()
{
 rl_back_to_indent ();
}

rl_back_to_indent (ignore1, ignore2)
    int ignore1, ignore2;
{
 rl_beg_of_line ();
 while (rl_point < rl_end && whitespace (the_line[rl_point]))
   rl_point++;
}

/* NOTE: it is necessary that opposite directions are inverses */
#define FTO      1              /* forward to */
#define BTO     -1              /* backward to */
#define FFIND    2              /* forward find */
#define BFIND   -2              /* backward find */

rl_vi_char_search (count, key)
    int count, key;
{
 static char target;
 static int orig_dir, dir;
 int pos;

 if (key == ';' || key == ',')
   dir = (key == ';' ? orig_dir : -orig_dir);
 else
   {
     target = rl_getc (in_stream);

     switch (key)
       {
       case 't':
         orig_dir = dir = FTO;
         break;

       case 'T':
         orig_dir = dir = BTO;
         break;

       case 'f':
         orig_dir = dir = FFIND;
         break;

       case 'F':
         orig_dir = dir = BFIND;
         break;
       }
   }

 pos = rl_point;

 if (dir < 0)
   {
     pos--;
     do
       {
         if (the_line[pos] == target)
           {
             if (dir == BTO)
               rl_point = pos + 1;
             else
               rl_point = pos;
             return;
           }
       }
     while (pos--);

     if (pos < 0)
       {
         ding ();
         return;
       }
   }
 else
   {                   /* dir > 0 */
     pos++;
     do
       {
         if (the_line[pos] == target)
           {
             if (dir == FTO)
               rl_point = pos - 1;
             else
               rl_point = pos;
             return;
           }
       }
     while (++pos < rl_end);

     if (pos >= (rl_end - 1))
       ding ();
   }
}

/* Match brackets */
rl_vi_match ()
{
 int count = 1, brack, pos;

 pos = rl_point;
 if ((brack = rl_vi_bracktype (the_line[rl_point])) == 0)
   {
     while ((brack = rl_vi_bracktype (the_line[rl_point])) == 0 &&
            rl_point < rl_end - 1)
       rl_forward (1);

     if (brack <= 0)
       {
         rl_point = pos;
         ding ();
         return;
       }
   }

 pos = rl_point;

 if (brack < 0)
   {
     while (count)
       {
         if (--pos >= 0)
           {
             int b = rl_vi_bracktype (the_line[pos]);
             if (b == -brack)
               count--;
             else if (b == brack)
               count++;
           }
         else
           {
             ding ();
             return;
           }
       }
   }
 else
   {                   /* brack > 0 */
     while (count)
       {
         if (++pos < rl_end)
           {
             int b = rl_vi_bracktype (the_line[pos]);
             if (b == -brack)
               count--;
             else if (b == brack)
               count++;
           }
         else
           {
             ding ();
             return;
           }
       }
   }
 rl_point = pos;
}

int
rl_vi_bracktype (c)
    int c;
{
 switch (c)
   {
   case '(': return  1;
   case ')': return -1;
   case '[': return  2;
   case ']': return -2;
   case '{': return  3;
   case '}': return -3;
   default:  return  0;
   }
}

rl_vi_change_char ()
{
 int c;

 c = rl_getc (in_stream);

 switch (c)
   {
   case '\033':
   case CTRL('C'):
     return;

   default:
     rl_begin_undo_group ();
     rl_delete (1, c);
     rl_insert (1, c);
     rl_end_undo_group ();
     break;
   }
}

rl_vi_subst (count, key)
    int count, key;
{
 rl_begin_undo_group ();
 vi_doing_insert = 1;

 if (uppercase_p (key))
   {
     rl_beg_of_line ();
     rl_kill_line (1);
   }
 else
   rl_delete (count, key);

 rl_vi_insertion_mode ();
}

rl_vi_overstrike (count, key)
    int count, key;
{
 int i;

 if (vi_doing_insert == 0)
   {
     vi_doing_insert = 1;
     rl_begin_undo_group ();
   }

 for (i = 0; i < count; i++)
   {
     vi_replace_count++;
     rl_begin_undo_group ();

     if (rl_point < rl_end)
       {
         rl_delete (1, key);
         rl_insert (1, key);
       }
     else
       rl_insert (1, key);

     rl_end_undo_group ();
   }
}

rl_vi_overstrike_delete (count)
    int count;
{
 int i, s;

 for (i = 0; i < count; i++)
   {
     if (vi_replace_count == 0)
       {
         ding ();
         break;
       }
     s = rl_point;

     if (rl_do_undo ())
       vi_replace_count--;

     if (rl_point == s)
       rl_backward (1);
   }

 if (vi_replace_count == 0 && vi_doing_insert)
   {
     rl_end_undo_group ();
     rl_do_undo ();
     vi_doing_insert = 0;
   }
}

rl_vi_replace ()
{
 int i;

 vi_replace_count = 0;

 vi_replace_map = rl_make_bare_keymap ();

 for (i = ' '; i < 127; i++)
   vi_replace_map[i].function = rl_vi_overstrike;

 vi_replace_map[RUBOUT].function = rl_vi_overstrike_delete;
 vi_replace_map[ESC].function = rl_vi_movement_mode;
 vi_replace_map[RETURN].function = rl_newline;
 vi_replace_map[NEWLINE].function = rl_newline;
 keymap = vi_replace_map;
}

/*
* Try to complete the word we are standing on or the word that ends with
* the previous character. A space matches everything.
* Word delimiters are space and ;.
*/
rl_vi_possible_completions()
{
 int save_pos = rl_point;

 if (!index (" ;", the_line[rl_point]))
   {
     while (!index(" ;", the_line[++rl_point]))
       ;
   }
 else if (the_line[rl_point-1] == ';')
   {
     ding ();
     return (0);
   }

 rl_possible_completions ();
 rl_point = save_pos;

 return (0);
}

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.