1525 lines
44 KiB
C
1525 lines
44 KiB
C
/* echo-area.c -- how to read a line in the echo area.
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$Id: echo-area.c,v 1.7 2004/12/14 00:15:36 karl Exp $
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Copyright (C) 1993, 1997, 1998, 1999, 2001, 2004 Free Software
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Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Written by Brian Fox (bfox@ai.mit.edu). */
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#include "info.h"
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#if defined (FD_SET)
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# if defined (hpux)
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# define fd_set_cast(x) (int *)(x)
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# else
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# define fd_set_cast(x) (fd_set *)(x)
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# endif /* !hpux */
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#endif /* FD_SET */
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/* Non-zero means that C-g was used to quit reading input. */
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int info_aborted_echo_area = 0;
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/* Non-zero means that the echo area is being used to read input. */
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int echo_area_is_active = 0;
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/* The address of the last command executed in the echo area. */
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VFunction *ea_last_executed_command = (VFunction *)NULL;
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/* Non-zero means that the last command executed while reading input
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killed some text. */
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int echo_area_last_command_was_kill = 0;
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/* Variables which hold on to the current state of the input line. */
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static char input_line[1 + EA_MAX_INPUT];
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static char *input_line_prompt;
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static int input_line_point;
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static int input_line_beg;
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static int input_line_end;
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static NODE input_line_node = {
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(char *)NULL, (char *)NULL, (char *)NULL, input_line,
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EA_MAX_INPUT, 0, N_IsInternal
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};
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static void echo_area_initialize_node (void);
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static void push_echo_area (void), pop_echo_area (void);
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static int echo_area_stack_contains_completions_p (void);
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static void ea_kill_text (int from, int to);
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/* Non-zero means we force the user to complete. */
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static int echo_area_must_complete_p = 0;
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static int completions_window_p (WINDOW *window);
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/* If non-null, this is a window which was specifically created to display
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possible completions output. We remember it so we can delete it when
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appropriate. */
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static WINDOW *echo_area_completions_window = (WINDOW *)NULL;
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/* Variables which keep track of the window which was active prior to
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entering the echo area. */
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static WINDOW *calling_window = (WINDOW *)NULL;
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static NODE *calling_window_node = (NODE *)NULL;
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static long calling_window_point = 0;
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static long calling_window_pagetop = 0;
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/* Remember the node and pertinent variables of the calling window. */
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static void
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remember_calling_window (WINDOW *window)
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{
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/* Only do this if the calling window is not the completions window, or,
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if it is the completions window and there is no other window. */
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if (!completions_window_p (window) ||
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((window == windows) && !(window->next)))
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{
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calling_window = window;
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calling_window_node = window->node;
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calling_window_point = window->point;
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calling_window_pagetop = window->pagetop;
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}
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}
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/* Restore the caller's window so that it shows the node that it was showing
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on entry to info_read_xxx_echo_area (). */
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static void
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restore_calling_window (void)
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{
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register WINDOW *win, *compwin = (WINDOW *)NULL;
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/* If the calling window is still visible, and it is the window that
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we used for completions output, then restore the calling window. */
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for (win = windows; win; win = win->next)
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{
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if (completions_window_p (win))
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compwin = win;
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if (win == calling_window && win == compwin)
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{
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window_set_node_of_window (calling_window, calling_window_node);
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calling_window->point = calling_window_point;
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calling_window->pagetop = calling_window_pagetop;
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compwin = (WINDOW *)NULL;
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break;
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}
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}
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/* Delete the completions window if it is still present, it isn't the
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last window on the screen, and there aren't any prior echo area reads
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pending which created a completions window. */
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if (compwin)
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{
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if ((compwin != windows || windows->next) &&
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!echo_area_stack_contains_completions_p ())
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{
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WINDOW *next;
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int pagetop = 0;
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int start = 0;
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int end = 0;
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int amount = 0;
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next = compwin->next;
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if (next)
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{
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start = next->first_row;
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end = start + next->height;
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amount = - (compwin->height + 1);
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pagetop = next->pagetop;
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}
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info_delete_window_internal (compwin);
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/* This is not necessary because info_delete_window_internal ()
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calls echo_area_inform_of_deleted_window (), which does the
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right thing. */
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#if defined (UNNECESSARY)
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echo_area_completions_window = (WINDOW *)NULL;
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#endif /* UNNECESSARY */
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if (next)
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{
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display_scroll_display (start, end, amount);
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next->pagetop = pagetop;
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display_update_display (windows);
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}
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}
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}
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}
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/* Set up a new input line with PROMPT. */
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static void
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initialize_input_line (char *prompt)
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{
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input_line_prompt = prompt;
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if (prompt)
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strcpy (input_line, prompt);
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else
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input_line[0] = '\0';
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input_line_beg = input_line_end = input_line_point = strlen (prompt);
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}
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static char *
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echo_area_after_read (void)
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{
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char *return_value;
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if (info_aborted_echo_area)
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{
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info_aborted_echo_area = 0;
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return_value = (char *)NULL;
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}
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else
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{
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if (input_line_beg == input_line_end)
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return_value = xstrdup ("");
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else
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{
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int line_len = input_line_end - input_line_beg;
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return_value = (char *) xmalloc (1 + line_len);
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strncpy (return_value, &input_line[input_line_beg], line_len);
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return_value[line_len] = '\0';
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}
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}
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return (return_value);
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}
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/* Read a line of text in the echo area. Return a malloc ()'ed string,
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or NULL if the user aborted out of this read. WINDOW is the currently
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active window, so that we can restore it when we need to. PROMPT, if
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non-null, is a prompt to print before reading the line. */
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char *
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info_read_in_echo_area (WINDOW *window, char *prompt)
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{
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char *line;
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/* If the echo area is already active, remember the current state. */
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if (echo_area_is_active)
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push_echo_area ();
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/* Initialize our local variables. */
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initialize_input_line (prompt);
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/* Initialize the echo area for the first (but maybe not the last) time. */
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echo_area_initialize_node ();
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/* Save away the original node of this window, and the window itself,
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so echo area commands can temporarily use this window. */
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remember_calling_window (window);
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/* Let the rest of Info know that the echo area is active. */
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echo_area_is_active++;
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active_window = the_echo_area;
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/* Read characters in the echo area. */
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info_read_and_dispatch ();
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echo_area_is_active--;
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/* Restore the original active window and show point in it. */
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active_window = calling_window;
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restore_calling_window ();
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display_cursor_at_point (active_window);
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fflush (stdout);
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/* Get the value of the line. */
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line = echo_area_after_read ();
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/* If there is a previous loop waiting for us, restore it now. */
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if (echo_area_is_active)
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pop_echo_area ();
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/* Return the results to the caller. */
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return (line);
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}
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/* (re) Initialize the echo area node. */
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static void
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echo_area_initialize_node (void)
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{
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register int i;
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for (i = input_line_end; (unsigned int) i < sizeof (input_line); i++)
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input_line[i] = ' ';
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input_line[i - 1] = '\n';
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window_set_node_of_window (the_echo_area, &input_line_node);
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input_line[input_line_end] = '\n';
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}
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/* Prepare to read characters in the echo area. This can initialize the
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echo area node, but its primary purpose is to side effect the input
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line buffer contents. */
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void
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echo_area_prep_read (void)
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{
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if (the_echo_area->node != &input_line_node)
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echo_area_initialize_node ();
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the_echo_area->point = input_line_point;
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input_line[input_line_end] = '\n';
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display_update_one_window (the_echo_area);
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display_cursor_at_point (active_window);
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}
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/* **************************************************************** */
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/* */
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/* Echo Area Movement Commands */
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/* */
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/* **************************************************************** */
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DECLARE_INFO_COMMAND (ea_forward, _("Move forward a character"))
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{
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if (count < 0)
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ea_backward (window, -count, key);
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else
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{
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input_line_point += count;
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if (input_line_point > input_line_end)
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input_line_point = input_line_end;
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}
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}
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DECLARE_INFO_COMMAND (ea_backward, _("Move backward a character"))
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{
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if (count < 0)
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ea_forward (window, -count, key);
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else
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{
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input_line_point -= count;
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if (input_line_point < input_line_beg)
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input_line_point = input_line_beg;
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}
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}
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DECLARE_INFO_COMMAND (ea_beg_of_line, _("Move to the start of this line"))
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{
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input_line_point = input_line_beg;
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}
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DECLARE_INFO_COMMAND (ea_end_of_line, _("Move to the end of this line"))
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{
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input_line_point = input_line_end;
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}
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#define alphabetic(c) (islower (c) || isupper (c) || isdigit (c))
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/* Move forward a word in the input line. */
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DECLARE_INFO_COMMAND (ea_forward_word, _("Move forward a word"))
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{
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int c;
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if (count < 0)
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ea_backward_word (window, -count, key);
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else
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{
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while (count--)
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{
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if (input_line_point == input_line_end)
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return;
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/* If we are not in a word, move forward until we are in one.
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Then, move forward until we hit a non-alphabetic character. */
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c = input_line[input_line_point];
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if (!alphabetic (c))
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{
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while (++input_line_point < input_line_end)
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{
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c = input_line[input_line_point];
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if (alphabetic (c))
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break;
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}
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}
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if (input_line_point == input_line_end)
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return;
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while (++input_line_point < input_line_end)
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{
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c = input_line[input_line_point];
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if (!alphabetic (c))
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break;
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}
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}
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}
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}
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DECLARE_INFO_COMMAND (ea_backward_word, _("Move backward a word"))
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{
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int c;
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if (count < 0)
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ea_forward_word (window, -count, key);
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else
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{
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while (count--)
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{
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if (input_line_point == input_line_beg)
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return;
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/* Like ea_forward_word (), except that we look at the
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characters just before point. */
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c = input_line[input_line_point - 1];
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if (!alphabetic (c))
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{
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while ((--input_line_point) != input_line_beg)
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{
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c = input_line[input_line_point - 1];
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if (alphabetic (c))
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break;
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}
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}
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while (input_line_point != input_line_beg)
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{
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c = input_line[input_line_point - 1];
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if (!alphabetic (c))
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break;
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else
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--input_line_point;
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}
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}
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}
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}
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DECLARE_INFO_COMMAND (ea_delete, _("Delete the character under the cursor"))
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{
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register int i;
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if (count < 0)
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ea_rubout (window, -count, key);
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else
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{
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if (input_line_point == input_line_end)
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return;
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if (info_explicit_arg || count > 1)
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{
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int orig_point;
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orig_point = input_line_point;
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ea_forward (window, count, key);
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ea_kill_text (orig_point, input_line_point);
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input_line_point = orig_point;
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}
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else
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{
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for (i = input_line_point; i < input_line_end; i++)
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input_line[i] = input_line[i + 1];
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input_line_end--;
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}
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}
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}
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DECLARE_INFO_COMMAND (ea_rubout, _("Delete the character behind the cursor"))
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{
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if (count < 0)
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ea_delete (window, -count, key);
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else
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{
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int start;
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if (input_line_point == input_line_beg)
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return;
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start = input_line_point;
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ea_backward (window, count, key);
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if (info_explicit_arg || count > 1)
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ea_kill_text (start, input_line_point);
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else
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ea_delete (window, count, key);
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}
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}
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DECLARE_INFO_COMMAND (ea_abort, _("Cancel or quit operation"))
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{
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/* If any text, just discard it, and restore the calling window's node.
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If no text, quit. */
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if (input_line_end != input_line_beg)
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{
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terminal_ring_bell ();
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input_line_end = input_line_point = input_line_beg;
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if (calling_window->node != calling_window_node)
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restore_calling_window ();
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}
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else
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info_aborted_echo_area = 1;
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}
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||
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DECLARE_INFO_COMMAND (ea_newline, _("Accept (or force completion of) this line"))
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{
|
||
/* Stub does nothing. Simply here to see if it has been executed. */
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||
}
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||
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DECLARE_INFO_COMMAND (ea_quoted_insert, _("Insert next character verbatim"))
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||
{
|
||
unsigned char character;
|
||
|
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character = info_get_another_input_char ();
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ea_insert (window, count, character);
|
||
}
|
||
|
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DECLARE_INFO_COMMAND (ea_insert, _("Insert this character"))
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{
|
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register int i;
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||
|
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if ((input_line_end + 1) == EA_MAX_INPUT)
|
||
{
|
||
terminal_ring_bell ();
|
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return;
|
||
}
|
||
|
||
for (i = input_line_end + 1; i != input_line_point; i--)
|
||
input_line[i] = input_line[i - 1];
|
||
|
||
input_line[input_line_point] = key;
|
||
input_line_point++;
|
||
input_line_end++;
|
||
}
|
||
|
||
DECLARE_INFO_COMMAND (ea_tab_insert, _("Insert a TAB character"))
|
||
{
|
||
ea_insert (window, count, '\t');
|
||
}
|
||
|
||
/* Transpose the characters at point. If point is at the end of the line,
|
||
then transpose the characters before point. */
|
||
DECLARE_INFO_COMMAND (ea_transpose_chars, _("Transpose characters at point"))
|
||
{
|
||
/* Handle conditions that would make it impossible to transpose
|
||
characters. */
|
||
if (!count || !input_line_point || (input_line_end - input_line_beg) < 2)
|
||
return;
|
||
|
||
while (count)
|
||
{
|
||
int t;
|
||
if (input_line_point == input_line_end)
|
||
{
|
||
t = input_line[input_line_point - 1];
|
||
|
||
input_line[input_line_point - 1] = input_line[input_line_point - 2];
|
||
input_line[input_line_point - 2] = t;
|
||
}
|
||
else
|
||
{
|
||
t = input_line[input_line_point];
|
||
|
||
input_line[input_line_point] = input_line[input_line_point - 1];
|
||
input_line[input_line_point - 1] = t;
|
||
|
||
if (count < 0 && input_line_point != input_line_beg)
|
||
input_line_point--;
|
||
else
|
||
input_line_point++;
|
||
}
|
||
|
||
if (count < 0)
|
||
count++;
|
||
else
|
||
count--;
|
||
}
|
||
}
|
||
|
||
/* **************************************************************** */
|
||
/* */
|
||
/* Echo Area Killing and Yanking */
|
||
/* */
|
||
/* **************************************************************** */
|
||
|
||
static char **kill_ring = (char **)NULL;
|
||
static int kill_ring_index = 0; /* Number of kills appearing in KILL_RING. */
|
||
static int kill_ring_slots = 0; /* Number of slots allocated to KILL_RING. */
|
||
static int kill_ring_loc = 0; /* Location of current yank pointer. */
|
||
|
||
/* The largest number of kills that we remember at one time. */
|
||
static int max_retained_kills = 15;
|
||
|
||
DECLARE_INFO_COMMAND (ea_yank, _("Yank back the contents of the last kill"))
|
||
{
|
||
register int i;
|
||
register char *text;
|
||
|
||
if (!kill_ring_index)
|
||
{
|
||
inform_in_echo_area ((char *) _("Kill ring is empty"));
|
||
return;
|
||
}
|
||
|
||
text = kill_ring[kill_ring_loc];
|
||
|
||
for (i = 0; text[i]; i++)
|
||
ea_insert (window, 1, text[i]);
|
||
}
|
||
|
||
/* If the last command was yank, or yank_pop, and the text just before
|
||
point is identical to the current kill item, then delete that text
|
||
from the line, rotate the index down, and yank back some other text. */
|
||
DECLARE_INFO_COMMAND (ea_yank_pop, _("Yank back a previous kill"))
|
||
{
|
||
register int len;
|
||
|
||
if (((ea_last_executed_command != (VFunction *) ea_yank) &&
|
||
(ea_last_executed_command != (VFunction *) ea_yank_pop)) ||
|
||
(kill_ring_index == 0))
|
||
return;
|
||
|
||
len = strlen (kill_ring[kill_ring_loc]);
|
||
|
||
/* Delete the last yanked item from the line. */
|
||
{
|
||
register int i, counter;
|
||
|
||
counter = input_line_end - input_line_point;
|
||
|
||
for (i = input_line_point - len; counter; i++, counter--)
|
||
input_line[i] = input_line[i + len];
|
||
|
||
input_line_end -= len;
|
||
input_line_point -= len;
|
||
}
|
||
|
||
/* Get a previous kill, and yank that. */
|
||
kill_ring_loc--;
|
||
if (kill_ring_loc < 0)
|
||
kill_ring_loc = kill_ring_index - 1;
|
||
|
||
ea_yank (window, count, key);
|
||
}
|
||
|
||
/* Delete the text from point to end of line. */
|
||
DECLARE_INFO_COMMAND (ea_kill_line, _("Kill to the end of the line"))
|
||
{
|
||
if (count < 0)
|
||
{
|
||
ea_kill_text (input_line_point, input_line_beg);
|
||
input_line_point = input_line_beg;
|
||
}
|
||
else
|
||
ea_kill_text (input_line_point, input_line_end);
|
||
}
|
||
|
||
/* Delete the text from point to beg of line. */
|
||
DECLARE_INFO_COMMAND (ea_backward_kill_line,
|
||
_("Kill to the beginning of the line"))
|
||
{
|
||
if (count < 0)
|
||
ea_kill_text (input_line_point, input_line_end);
|
||
else
|
||
{
|
||
ea_kill_text (input_line_point, input_line_beg);
|
||
input_line_point = input_line_beg;
|
||
}
|
||
}
|
||
|
||
/* Delete from point to the end of the current word. */
|
||
DECLARE_INFO_COMMAND (ea_kill_word, _("Kill the word following the cursor"))
|
||
{
|
||
int orig_point = input_line_point;
|
||
|
||
if (count < 0)
|
||
ea_backward_kill_word (window, -count, key);
|
||
else
|
||
{
|
||
ea_forward_word (window, count, key);
|
||
|
||
if (input_line_point != orig_point)
|
||
ea_kill_text (orig_point, input_line_point);
|
||
|
||
input_line_point = orig_point;
|
||
}
|
||
}
|
||
|
||
/* Delete from point to the start of the current word. */
|
||
DECLARE_INFO_COMMAND (ea_backward_kill_word,
|
||
_("Kill the word preceding the cursor"))
|
||
{
|
||
int orig_point = input_line_point;
|
||
|
||
if (count < 0)
|
||
ea_kill_word (window, -count, key);
|
||
else
|
||
{
|
||
ea_backward_word (window, count, key);
|
||
|
||
if (input_line_point != orig_point)
|
||
ea_kill_text (orig_point, input_line_point);
|
||
}
|
||
}
|
||
|
||
/* The way to kill something. This appends or prepends to the last
|
||
kill, if the last command was a kill command. If FROM is less
|
||
than TO, then the killed text is appended to the most recent kill,
|
||
otherwise it is prepended. If the last command was not a kill command,
|
||
then a new slot is made for this kill. */
|
||
static void
|
||
ea_kill_text (int from, int to)
|
||
{
|
||
register int i, counter, distance;
|
||
int killing_backwards, slot;
|
||
char *killed_text;
|
||
|
||
killing_backwards = (from > to);
|
||
|
||
/* If killing backwards, reverse the values of FROM and TO. */
|
||
if (killing_backwards)
|
||
{
|
||
int temp = from;
|
||
from = to;
|
||
to = temp;
|
||
}
|
||
|
||
/* Remember the text that we are about to delete. */
|
||
distance = to - from;
|
||
killed_text = (char *)xmalloc (1 + distance);
|
||
strncpy (killed_text, &input_line[from], distance);
|
||
killed_text[distance] = '\0';
|
||
|
||
/* Actually delete the text from the line. */
|
||
counter = input_line_end - to;
|
||
|
||
for (i = from; counter; i++, counter--)
|
||
input_line[i] = input_line[i + distance];
|
||
|
||
input_line_end -= distance;
|
||
|
||
/* If the last command was a kill, append or prepend the killed text to
|
||
the last command's killed text. */
|
||
if (echo_area_last_command_was_kill)
|
||
{
|
||
char *old, *new;
|
||
|
||
slot = kill_ring_loc;
|
||
old = kill_ring[slot];
|
||
new = (char *)xmalloc (1 + strlen (old) + strlen (killed_text));
|
||
|
||
if (killing_backwards)
|
||
{
|
||
/* Prepend TEXT to current kill. */
|
||
strcpy (new, killed_text);
|
||
strcat (new, old);
|
||
}
|
||
else
|
||
{
|
||
/* Append TEXT to current kill. */
|
||
strcpy (new, old);
|
||
strcat (new, killed_text);
|
||
}
|
||
|
||
free (old);
|
||
free (killed_text);
|
||
kill_ring[slot] = new;
|
||
}
|
||
else
|
||
{
|
||
/* Try to store the kill in a new slot, unless that would cause there
|
||
to be too many remembered kills. */
|
||
slot = kill_ring_index;
|
||
|
||
if (slot == max_retained_kills)
|
||
slot = 0;
|
||
|
||
if (slot + 1 > kill_ring_slots)
|
||
kill_ring = (char **) xrealloc
|
||
(kill_ring,
|
||
(kill_ring_slots += max_retained_kills) * sizeof (char *));
|
||
|
||
if (slot != kill_ring_index)
|
||
free (kill_ring[slot]);
|
||
else
|
||
kill_ring_index++;
|
||
|
||
kill_ring[slot] = killed_text;
|
||
|
||
kill_ring_loc = slot;
|
||
}
|
||
|
||
/* Notice that the last command was a kill. */
|
||
echo_area_last_command_was_kill++;
|
||
}
|
||
|
||
/* **************************************************************** */
|
||
/* */
|
||
/* Echo Area Completion */
|
||
/* */
|
||
/* **************************************************************** */
|
||
|
||
/* Pointer to an array of REFERENCE to complete over. */
|
||
static REFERENCE **echo_area_completion_items = (REFERENCE **)NULL;
|
||
|
||
/* Sorted array of REFERENCE * which is the possible completions found in
|
||
the variable echo_area_completion_items. If there is only one element,
|
||
it is the only possible completion. */
|
||
static REFERENCE **completions_found = (REFERENCE **)NULL;
|
||
static int completions_found_index = 0;
|
||
static int completions_found_slots = 0;
|
||
|
||
/* The lowest common denominator found while completing. */
|
||
static REFERENCE *LCD_completion;
|
||
|
||
/* Internal functions used by the user calls. */
|
||
static void build_completions (void), completions_must_be_rebuilt (void);
|
||
|
||
/* Variable which holds the output of completions. */
|
||
static NODE *possible_completions_output_node = (NODE *)NULL;
|
||
|
||
static char *compwin_name = "*Completions*";
|
||
|
||
/* Return non-zero if WINDOW is a window used for completions output. */
|
||
static int
|
||
completions_window_p (WINDOW *window)
|
||
{
|
||
int result = 0;
|
||
|
||
if (internal_info_node_p (window->node) &&
|
||
(strcmp (window->node->nodename, compwin_name) == 0))
|
||
result = 1;
|
||
|
||
return (result);
|
||
}
|
||
|
||
/* Workhorse for completion readers. If FORCE is non-zero, the user cannot
|
||
exit unless the line read completes, or is empty. */
|
||
char *
|
||
info_read_completing_internal (WINDOW *window, char *prompt,
|
||
REFERENCE **completions, int force)
|
||
{
|
||
char *line;
|
||
|
||
/* If the echo area is already active, remember the current state. */
|
||
if (echo_area_is_active)
|
||
push_echo_area ();
|
||
|
||
echo_area_must_complete_p = force;
|
||
|
||
/* Initialize our local variables. */
|
||
initialize_input_line (prompt);
|
||
|
||
/* Initialize the echo area for the first (but maybe not the last) time. */
|
||
echo_area_initialize_node ();
|
||
|
||
/* Save away the original node of this window, and the window itself,
|
||
so echo area commands can temporarily use this window. */
|
||
remember_calling_window (window);
|
||
|
||
/* Save away the list of items to complete over. */
|
||
echo_area_completion_items = completions;
|
||
completions_must_be_rebuilt ();
|
||
|
||
active_window = the_echo_area;
|
||
echo_area_is_active++;
|
||
|
||
/* Read characters in the echo area. */
|
||
while (1)
|
||
{
|
||
info_read_and_dispatch ();
|
||
|
||
line = echo_area_after_read ();
|
||
|
||
/* Force the completion to take place if the user hasn't accepted
|
||
a default or aborted, and if FORCE is active. */
|
||
if (force && line && *line && completions)
|
||
{
|
||
register int i;
|
||
|
||
build_completions ();
|
||
|
||
/* If there is only one completion, then make the line be that
|
||
completion. */
|
||
if (completions_found_index == 1)
|
||
{
|
||
free (line);
|
||
line = xstrdup (completions_found[0]->label);
|
||
break;
|
||
}
|
||
|
||
/* If one of the completions matches exactly, then that is okay, so
|
||
return the current line. */
|
||
for (i = 0; i < completions_found_index; i++)
|
||
if (strcasecmp (completions_found[i]->label, line) == 0)
|
||
{
|
||
free (line);
|
||
line = xstrdup (completions_found[i]->label);
|
||
break;
|
||
}
|
||
|
||
/* If no match, go back and try again. */
|
||
if (i == completions_found_index)
|
||
{
|
||
if (!completions_found_index)
|
||
inform_in_echo_area ((char *) _("No completions"));
|
||
else
|
||
inform_in_echo_area ((char *) _("Not complete"));
|
||
continue;
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
echo_area_is_active--;
|
||
|
||
/* Restore the original active window and show point in it. */
|
||
active_window = calling_window;
|
||
restore_calling_window ();
|
||
display_cursor_at_point (active_window);
|
||
fflush (stdout);
|
||
|
||
echo_area_completion_items = (REFERENCE **)NULL;
|
||
completions_must_be_rebuilt ();
|
||
|
||
/* If there is a previous loop waiting for us, restore it now. */
|
||
if (echo_area_is_active)
|
||
pop_echo_area ();
|
||
|
||
return (line);
|
||
}
|
||
|
||
/* Read a line in the echo area with completion over COMPLETIONS. */
|
||
char *
|
||
info_read_completing_in_echo_area (WINDOW *window,
|
||
char *prompt, REFERENCE **completions)
|
||
{
|
||
return (info_read_completing_internal (window, prompt, completions, 1));
|
||
}
|
||
|
||
/* Read a line in the echo area allowing completion over COMPLETIONS, but
|
||
not requiring it. */
|
||
char *
|
||
info_read_maybe_completing (WINDOW *window,
|
||
char *prompt, REFERENCE **completions)
|
||
{
|
||
return (info_read_completing_internal (window, prompt, completions, 0));
|
||
}
|
||
|
||
DECLARE_INFO_COMMAND (ea_possible_completions, _("List possible completions"))
|
||
{
|
||
if (!echo_area_completion_items)
|
||
{
|
||
ea_insert (window, count, key);
|
||
return;
|
||
}
|
||
|
||
build_completions ();
|
||
|
||
if (!completions_found_index)
|
||
{
|
||
terminal_ring_bell ();
|
||
inform_in_echo_area ((char *) _("No completions"));
|
||
}
|
||
else if ((completions_found_index == 1) && (key != '?'))
|
||
{
|
||
inform_in_echo_area ((char *) _("Sole completion"));
|
||
}
|
||
else
|
||
{
|
||
register int i, l;
|
||
int limit, iterations, max_label = 0;
|
||
|
||
initialize_message_buffer ();
|
||
printf_to_message_buffer (completions_found_index == 1
|
||
? (char *) _("One completion:\n")
|
||
: (char *) _("%d completions:\n"),
|
||
(void *) (long) completions_found_index,
|
||
NULL, NULL);
|
||
|
||
/* Find the maximum length of a label. */
|
||
for (i = 0; i < completions_found_index; i++)
|
||
{
|
||
int len = strlen (completions_found[i]->label);
|
||
if (len > max_label)
|
||
max_label = len;
|
||
}
|
||
|
||
max_label += 4;
|
||
|
||
/* Find out how many columns we should print in. */
|
||
limit = calling_window->width / max_label;
|
||
if (limit != 1 && (limit * max_label == calling_window->width))
|
||
limit--;
|
||
|
||
/* Avoid a possible floating exception. If max_label > width then
|
||
the limit will be 0 and a divide-by-zero fault will result. */
|
||
if (limit == 0)
|
||
limit = 1;
|
||
|
||
/* How many iterations of the printing loop? */
|
||
iterations = (completions_found_index + (limit - 1)) / limit;
|
||
|
||
/* Watch out for special case. If the number of completions is less
|
||
than LIMIT, then just do the inner printing loop. */
|
||
if (completions_found_index < limit)
|
||
iterations = 1;
|
||
|
||
/* Print the sorted items, up-and-down alphabetically. */
|
||
for (i = 0; i < iterations; i++)
|
||
{
|
||
register int j;
|
||
|
||
for (j = 0, l = i; j < limit; j++)
|
||
{
|
||
if (l >= completions_found_index)
|
||
break;
|
||
else
|
||
{
|
||
char *label;
|
||
int printed_length, k;
|
||
|
||
label = completions_found[l]->label;
|
||
printed_length = strlen (label);
|
||
printf_to_message_buffer ("%s", label, NULL, NULL);
|
||
|
||
if (j + 1 < limit)
|
||
{
|
||
for (k = 0; k < max_label - printed_length; k++)
|
||
printf_to_message_buffer (" ", NULL, NULL, NULL);
|
||
}
|
||
}
|
||
l += iterations;
|
||
}
|
||
printf_to_message_buffer ("\n", NULL, NULL, NULL);
|
||
}
|
||
|
||
/* Make a new node to hold onto possible completions. Don't destroy
|
||
dangling pointers. */
|
||
{
|
||
NODE *temp;
|
||
|
||
temp = message_buffer_to_node ();
|
||
add_gcable_pointer (temp->contents);
|
||
name_internal_node (temp, compwin_name);
|
||
possible_completions_output_node = temp;
|
||
}
|
||
|
||
/* Find a suitable window for displaying the completions output.
|
||
First choice is an existing window showing completions output.
|
||
If there is only one window, and it is large, make another
|
||
(smaller) window, and use that one. Otherwise, use the caller's
|
||
window. */
|
||
{
|
||
WINDOW *compwin;
|
||
|
||
compwin = get_internal_info_window (compwin_name);
|
||
|
||
if (!compwin)
|
||
{
|
||
/* If we can split the window to display most of the completion
|
||
items, then do so. */
|
||
if (calling_window->height > (iterations * 2)
|
||
&& calling_window->height / 2 >= WINDOW_MIN_SIZE)
|
||
{
|
||
int start, pagetop;
|
||
#ifdef SPLIT_BEFORE_ACTIVE
|
||
int end;
|
||
#endif
|
||
|
||
active_window = calling_window;
|
||
|
||
/* Perhaps we can scroll this window on redisplay. */
|
||
start = calling_window->first_row;
|
||
pagetop = calling_window->pagetop;
|
||
|
||
compwin =
|
||
window_make_window (possible_completions_output_node);
|
||
active_window = the_echo_area;
|
||
window_change_window_height
|
||
(compwin, -(compwin->height - (iterations + 2)));
|
||
|
||
window_adjust_pagetop (calling_window);
|
||
remember_calling_window (calling_window);
|
||
|
||
#if defined (SPLIT_BEFORE_ACTIVE)
|
||
/* If the pagetop hasn't changed, scrolling the calling
|
||
window is a reasonable thing to do. */
|
||
if (pagetop == calling_window->pagetop)
|
||
{
|
||
end = start + calling_window->height;
|
||
display_scroll_display
|
||
(start, end, calling_window->prev->height + 1);
|
||
}
|
||
#else /* !SPLIT_BEFORE_ACTIVE */
|
||
/* If the pagetop has changed, set the new pagetop here. */
|
||
if (pagetop != calling_window->pagetop)
|
||
{
|
||
int newtop = calling_window->pagetop;
|
||
calling_window->pagetop = pagetop;
|
||
set_window_pagetop (calling_window, newtop);
|
||
}
|
||
#endif /* !SPLIT_BEFORE_ACTIVE */
|
||
|
||
echo_area_completions_window = compwin;
|
||
remember_window_and_node (compwin, compwin->node);
|
||
}
|
||
else
|
||
compwin = calling_window;
|
||
}
|
||
|
||
if (compwin->node != possible_completions_output_node)
|
||
{
|
||
window_set_node_of_window
|
||
(compwin, possible_completions_output_node);
|
||
remember_window_and_node (compwin, compwin->node);
|
||
}
|
||
|
||
display_update_display (windows);
|
||
}
|
||
}
|
||
}
|
||
|
||
DECLARE_INFO_COMMAND (ea_complete, _("Insert completion"))
|
||
{
|
||
if (!echo_area_completion_items)
|
||
{
|
||
ea_insert (window, count, key);
|
||
return;
|
||
}
|
||
|
||
/* If KEY is SPC, and we are not forcing completion to take place, simply
|
||
insert the key. */
|
||
if (!echo_area_must_complete_p && key == SPC)
|
||
{
|
||
ea_insert (window, count, key);
|
||
return;
|
||
}
|
||
|
||
if (ea_last_executed_command == (VFunction *) ea_complete)
|
||
{
|
||
/* If the keypress is a SPC character, and we have already tried
|
||
completing once, and there are several completions, then check
|
||
the batch of completions to see if any continue with a space.
|
||
If there are some, insert the space character and continue. */
|
||
if (key == SPC && completions_found_index > 1)
|
||
{
|
||
register int i, offset;
|
||
|
||
offset = input_line_end - input_line_beg;
|
||
|
||
for (i = 0; i < completions_found_index; i++)
|
||
if (completions_found[i]->label[offset] == ' ')
|
||
break;
|
||
|
||
if (completions_found[i])
|
||
ea_insert (window, 1, ' ');
|
||
else
|
||
{
|
||
ea_possible_completions (window, count, key);
|
||
return;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
ea_possible_completions (window, count, key);
|
||
return;
|
||
}
|
||
}
|
||
|
||
input_line_point = input_line_end;
|
||
build_completions ();
|
||
|
||
if (!completions_found_index)
|
||
terminal_ring_bell ();
|
||
else if (LCD_completion->label[0] == '\0')
|
||
ea_possible_completions (window, count, key);
|
||
else
|
||
{
|
||
register int i;
|
||
input_line_point = input_line_end = input_line_beg;
|
||
for (i = 0; LCD_completion->label[i]; i++)
|
||
ea_insert (window, 1, LCD_completion->label[i]);
|
||
}
|
||
}
|
||
|
||
/* Utility REFERENCE used to store possible LCD. */
|
||
static REFERENCE LCD_reference = {
|
||
(char *)NULL, (char *)NULL, (char *)NULL, 0, 0, 0
|
||
};
|
||
|
||
static void remove_completion_duplicates (void);
|
||
|
||
/* Variables which remember the state of the most recent call
|
||
to build_completions (). */
|
||
static char *last_completion_request = (char *)NULL;
|
||
static REFERENCE **last_completion_items = (REFERENCE **)NULL;
|
||
|
||
/* How to tell the completion builder to reset internal state. */
|
||
static void
|
||
completions_must_be_rebuilt (void)
|
||
{
|
||
maybe_free (last_completion_request);
|
||
last_completion_request = (char *)NULL;
|
||
last_completion_items = (REFERENCE **)NULL;
|
||
}
|
||
|
||
/* Build a list of possible completions from echo_area_completion_items,
|
||
and the contents of input_line. */
|
||
static void
|
||
build_completions (void)
|
||
{
|
||
register int i, len;
|
||
register REFERENCE *entry;
|
||
char *request;
|
||
int informed_of_lengthy_job = 0;
|
||
|
||
/* If there are no items to complete over, exit immediately. */
|
||
if (!echo_area_completion_items)
|
||
{
|
||
completions_found_index = 0;
|
||
LCD_completion = (REFERENCE *)NULL;
|
||
return;
|
||
}
|
||
|
||
/* Check to see if this call to build completions is the same as the last
|
||
call to build completions. */
|
||
len = input_line_end - input_line_beg;
|
||
request = (char *)xmalloc (1 + len);
|
||
strncpy (request, &input_line[input_line_beg], len);
|
||
request[len] = '\0';
|
||
|
||
if (last_completion_request && last_completion_items &&
|
||
last_completion_items == echo_area_completion_items &&
|
||
(strcmp (last_completion_request, request) == 0))
|
||
{
|
||
free (request);
|
||
return;
|
||
}
|
||
|
||
maybe_free (last_completion_request);
|
||
last_completion_request = request;
|
||
last_completion_items = echo_area_completion_items;
|
||
|
||
/* Always start at the beginning of the list. */
|
||
completions_found_index = 0;
|
||
LCD_completion = (REFERENCE *)NULL;
|
||
|
||
for (i = 0; (entry = echo_area_completion_items[i]); i++)
|
||
{
|
||
if (strncasecmp (request, entry->label, len) == 0)
|
||
add_pointer_to_array (entry, completions_found_index,
|
||
completions_found, completions_found_slots,
|
||
20, REFERENCE *);
|
||
|
||
if (!informed_of_lengthy_job && completions_found_index > 100)
|
||
{
|
||
informed_of_lengthy_job = 1;
|
||
window_message_in_echo_area ((char *) _("Building completions..."),
|
||
NULL, NULL);
|
||
}
|
||
}
|
||
|
||
if (!completions_found_index)
|
||
return;
|
||
|
||
/* Sort and prune duplicate entries from the completions array. */
|
||
remove_completion_duplicates ();
|
||
|
||
/* If there is only one completion, just return that. */
|
||
if (completions_found_index == 1)
|
||
{
|
||
LCD_completion = completions_found[0];
|
||
return;
|
||
}
|
||
|
||
/* Find the least common denominator. */
|
||
{
|
||
long shortest = 100000;
|
||
|
||
for (i = 1; i < completions_found_index; i++)
|
||
{
|
||
register int j;
|
||
int c1, c2;
|
||
|
||
for (j = 0;
|
||
(c1 = info_tolower (completions_found[i - 1]->label[j])) &&
|
||
(c2 = info_tolower (completions_found[i]->label[j]));
|
||
j++)
|
||
if (c1 != c2)
|
||
break;
|
||
|
||
if (shortest > j)
|
||
shortest = j;
|
||
}
|
||
|
||
maybe_free (LCD_reference.label);
|
||
LCD_reference.label = (char *)xmalloc (1 + shortest);
|
||
/* Since both the sorting done inside remove_completion_duplicates
|
||
and all the comparisons above are case-insensitive, it's
|
||
possible that the completion we are going to return is
|
||
identical to what the user typed but for the letter-case. This
|
||
is confusing, since the user could type FOOBAR<TAB> and get her
|
||
string change letter-case for no good reason. So try to find a
|
||
possible completion whose letter-case is identical, and if so,
|
||
use that. */
|
||
if (completions_found_index > 1)
|
||
{
|
||
int req_len = strlen (request);
|
||
|
||
for (i = 0; i < completions_found_index; i++)
|
||
if (strncmp (request, completions_found[i]->label, req_len) == 0)
|
||
break;
|
||
/* If none of the candidates match exactly, use the first one. */
|
||
if (i >= completions_found_index)
|
||
i = 0;
|
||
}
|
||
strncpy (LCD_reference.label, completions_found[i]->label, shortest);
|
||
LCD_reference.label[shortest] = '\0';
|
||
LCD_completion = &LCD_reference;
|
||
}
|
||
|
||
if (informed_of_lengthy_job)
|
||
echo_area_initialize_node ();
|
||
}
|
||
|
||
/* Function called by qsort. */
|
||
static int
|
||
compare_references (const void *entry1, const void *entry2)
|
||
{
|
||
REFERENCE **e1 = (REFERENCE **) entry1;
|
||
REFERENCE **e2 = (REFERENCE **) entry2;
|
||
|
||
return (strcasecmp ((*e1)->label, (*e2)->label));
|
||
}
|
||
|
||
/* Prune duplicate entries from COMPLETIONS_FOUND. */
|
||
static void
|
||
remove_completion_duplicates (void)
|
||
{
|
||
register int i, j;
|
||
REFERENCE **temp;
|
||
int newlen;
|
||
|
||
if (!completions_found_index)
|
||
return;
|
||
|
||
/* Sort the items. */
|
||
qsort (completions_found, completions_found_index, sizeof (REFERENCE *),
|
||
compare_references);
|
||
|
||
for (i = 0, newlen = 1; i < completions_found_index - 1; i++)
|
||
{
|
||
if (strcmp (completions_found[i]->label,
|
||
completions_found[i + 1]->label) == 0)
|
||
completions_found[i] = (REFERENCE *)NULL;
|
||
else
|
||
newlen++;
|
||
}
|
||
|
||
/* We have marked all the dead slots. It is faster to copy the live slots
|
||
twice than to prune the dead slots one by one. */
|
||
temp = (REFERENCE **)xmalloc ((1 + newlen) * sizeof (REFERENCE *));
|
||
for (i = 0, j = 0; i < completions_found_index; i++)
|
||
if (completions_found[i])
|
||
temp[j++] = completions_found[i];
|
||
|
||
for (i = 0; i < newlen; i++)
|
||
completions_found[i] = temp[i];
|
||
|
||
completions_found[i] = (REFERENCE *)NULL;
|
||
completions_found_index = newlen;
|
||
free (temp);
|
||
}
|
||
|
||
/* Scroll the "other" window. If there is a window showing completions, scroll
|
||
that one, otherwise scroll the window which was active on entering the read
|
||
function. */
|
||
DECLARE_INFO_COMMAND (ea_scroll_completions_window, _("Scroll the completions window"))
|
||
{
|
||
WINDOW *compwin;
|
||
int old_pagetop;
|
||
|
||
compwin = get_internal_info_window (compwin_name);
|
||
|
||
if (!compwin)
|
||
compwin = calling_window;
|
||
|
||
old_pagetop = compwin->pagetop;
|
||
|
||
/* Let info_scroll_forward () do the work, and print any messages that
|
||
need to be displayed. */
|
||
info_scroll_forward (compwin, count, key);
|
||
}
|
||
|
||
/* Function which gets called when an Info window is deleted while the
|
||
echo area is active. WINDOW is the window which has just been deleted. */
|
||
void
|
||
echo_area_inform_of_deleted_window (WINDOW *window)
|
||
{
|
||
/* If this is the calling_window, forget what we remembered about it. */
|
||
if (window == calling_window)
|
||
{
|
||
if (active_window != the_echo_area)
|
||
remember_calling_window (active_window);
|
||
else
|
||
remember_calling_window (windows);
|
||
}
|
||
|
||
/* If this window was the echo_area_completions_window, then notice that
|
||
the window has been deleted. */
|
||
if (window == echo_area_completions_window)
|
||
echo_area_completions_window = (WINDOW *)NULL;
|
||
}
|
||
|
||
/* **************************************************************** */
|
||
/* */
|
||
/* Pushing and Popping the Echo Area */
|
||
/* */
|
||
/* **************************************************************** */
|
||
|
||
/* Push and Pop the echo area. */
|
||
typedef struct {
|
||
char *line;
|
||
char *prompt;
|
||
REFERENCE **comp_items;
|
||
int point, beg, end;
|
||
int must_complete;
|
||
NODE node;
|
||
WINDOW *compwin;
|
||
} PUSHED_EA;
|
||
|
||
static PUSHED_EA **pushed_echo_areas = (PUSHED_EA **)NULL;
|
||
static int pushed_echo_areas_index = 0;
|
||
static int pushed_echo_areas_slots = 0;
|
||
|
||
/* Pushing the echo_area has a side effect of zeroing the completion_items. */
|
||
static void
|
||
push_echo_area (void)
|
||
{
|
||
PUSHED_EA *pushed;
|
||
|
||
pushed = (PUSHED_EA *)xmalloc (sizeof (PUSHED_EA));
|
||
pushed->line = xstrdup (input_line);
|
||
pushed->prompt = input_line_prompt;
|
||
pushed->point = input_line_point;
|
||
pushed->beg = input_line_beg;
|
||
pushed->end = input_line_end;
|
||
pushed->node = input_line_node;
|
||
pushed->comp_items = echo_area_completion_items;
|
||
pushed->must_complete = echo_area_must_complete_p;
|
||
pushed->compwin = echo_area_completions_window;
|
||
|
||
add_pointer_to_array (pushed, pushed_echo_areas_index, pushed_echo_areas,
|
||
pushed_echo_areas_slots, 4, PUSHED_EA *);
|
||
|
||
echo_area_completion_items = (REFERENCE **)NULL;
|
||
}
|
||
|
||
static void
|
||
pop_echo_area (void)
|
||
{
|
||
PUSHED_EA *popped;
|
||
|
||
popped = pushed_echo_areas[--pushed_echo_areas_index];
|
||
|
||
strcpy (input_line, popped->line);
|
||
free (popped->line);
|
||
input_line_prompt = popped->prompt;
|
||
input_line_point = popped->point;
|
||
input_line_beg = popped->beg;
|
||
input_line_end = popped->end;
|
||
input_line_node = popped->node;
|
||
echo_area_completion_items = popped->comp_items;
|
||
echo_area_must_complete_p = popped->must_complete;
|
||
echo_area_completions_window = popped->compwin;
|
||
completions_must_be_rebuilt ();
|
||
|
||
/* If the completion window no longer exists, forget about it. */
|
||
if (echo_area_completions_window)
|
||
{
|
||
register WINDOW *win;
|
||
|
||
for (win = windows; win; win = win->next)
|
||
if (echo_area_completions_window == win)
|
||
break;
|
||
|
||
/* If the window wasn't found, then it has already been deleted. */
|
||
if (!win)
|
||
echo_area_completions_window = (WINDOW *)NULL;
|
||
}
|
||
|
||
free (popped);
|
||
}
|
||
|
||
/* Returns non-zero if any of the prior stacked calls to read in the echo
|
||
area produced a completions window. */
|
||
static int
|
||
echo_area_stack_contains_completions_p (void)
|
||
{
|
||
register int i;
|
||
|
||
for (i = 0; i < pushed_echo_areas_index; i++)
|
||
if (pushed_echo_areas[i]->compwin)
|
||
return (1);
|
||
|
||
return (0);
|
||
}
|
||
|
||
/* **************************************************************** */
|
||
/* */
|
||
/* Error Messages While Reading in Echo Area */
|
||
/* */
|
||
/* **************************************************************** */
|
||
|
||
#if defined (HAVE_SYS_TIME_H)
|
||
# include <sys/time.h>
|
||
# define HAVE_STRUCT_TIMEVAL
|
||
#endif /* HAVE_SYS_TIME_H */
|
||
|
||
static void
|
||
pause_or_input (void)
|
||
{
|
||
#ifdef FD_SET
|
||
struct timeval timer;
|
||
fd_set readfds;
|
||
int ready;
|
||
|
||
FD_ZERO (&readfds);
|
||
FD_SET (fileno (stdin), &readfds);
|
||
timer.tv_sec = 2;
|
||
timer.tv_usec = 0;
|
||
ready = select (fileno (stdin) + 1, &readfds, (fd_set *) NULL,
|
||
(fd_set *) NULL, &timer);
|
||
#endif /* FD_SET */
|
||
}
|
||
|
||
/* Print MESSAGE right after the end of the current line, and wait
|
||
for input or a couple of seconds, whichever comes first. Then flush the
|
||
informational message that was printed. */
|
||
void
|
||
inform_in_echo_area (const char *message)
|
||
{
|
||
int i;
|
||
char *text;
|
||
int avail = EA_MAX_INPUT + 1 - input_line_end;
|
||
|
||
text = xstrdup (message);
|
||
for (i = 0; text[i] && text[i] != '\n' && i < avail; i++)
|
||
;
|
||
text[i] = 0;
|
||
|
||
echo_area_initialize_node ();
|
||
sprintf (&input_line[input_line_end], "%s[%s]\n",
|
||
echo_area_is_active ? " ": "", text);
|
||
free (text);
|
||
the_echo_area->point = input_line_point;
|
||
display_update_one_window (the_echo_area);
|
||
display_cursor_at_point (active_window);
|
||
fflush (stdout);
|
||
pause_or_input ();
|
||
echo_area_initialize_node ();
|
||
}
|