331 lines
7 KiB
C
331 lines
7 KiB
C
/* readline.c -- a general facility for reading lines of input
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with emacs style editing and completion. */
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/* Copyright (C) 1987-2009 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library (Readline), a library
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for reading lines of text with interactive input and history editing.
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Readline 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 3 of the License, or
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(at your option) any later version.
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Readline 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 Readline. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#include <sys/types.h>
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h> /* for _POSIX_VERSION */
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#endif /* HAVE_UNISTD_H */
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#if defined (HAVE_STDLIB_H)
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# include <stdlib.h>
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#else
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# include "ansi_stdlib.h"
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#endif /* HAVE_STDLIB_H */
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#include <stdio.h>
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/* System-specific feature definitions and include files. */
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#include "rldefs.h"
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/* Some standard library routines. */
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#include "readline.h"
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#include "history.h"
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#include "rlprivate.h"
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#include "xmalloc.h"
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extern void replace_history_data PARAMS((int, histdata_t *, histdata_t *));
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/* Non-zero tells rl_delete_text and rl_insert_text to not add to
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the undo list. */
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int _rl_doing_an_undo = 0;
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/* How many unclosed undo groups we currently have. */
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int _rl_undo_group_level = 0;
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/* The current undo list for THE_LINE. */
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UNDO_LIST *rl_undo_list = (UNDO_LIST *)NULL;
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/* **************************************************************** */
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/* */
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/* Undo, and Undoing */
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/* */
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/* **************************************************************** */
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static UNDO_LIST *
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alloc_undo_entry (what, start, end, text)
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enum undo_code what;
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int start, end;
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char *text;
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{
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UNDO_LIST *temp;
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temp = (UNDO_LIST *)xmalloc (sizeof (UNDO_LIST));
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temp->what = what;
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temp->start = start;
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temp->end = end;
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temp->text = text;
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temp->next = (UNDO_LIST *)NULL;
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return temp;
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}
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/* Remember how to undo something. Concatenate some undos if that
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seems right. */
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void
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rl_add_undo (what, start, end, text)
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enum undo_code what;
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int start, end;
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char *text;
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{
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UNDO_LIST *temp;
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temp = alloc_undo_entry (what, start, end, text);
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temp->next = rl_undo_list;
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rl_undo_list = temp;
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}
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/* Free the existing undo list. */
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void
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rl_free_undo_list ()
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{
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UNDO_LIST *release, *orig_list;
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orig_list = rl_undo_list;
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while (rl_undo_list)
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{
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release = rl_undo_list;
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rl_undo_list = rl_undo_list->next;
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if (release->what == UNDO_DELETE)
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xfree (release->text);
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xfree (release);
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}
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rl_undo_list = (UNDO_LIST *)NULL;
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replace_history_data (-1, (histdata_t *)orig_list, (histdata_t *)NULL);
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}
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UNDO_LIST *
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_rl_copy_undo_entry (entry)
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UNDO_LIST *entry;
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{
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UNDO_LIST *new;
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new = alloc_undo_entry (entry->what, entry->start, entry->end, (char *)NULL);
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new->text = entry->text ? savestring (entry->text) : 0;
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return new;
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}
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UNDO_LIST *
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_rl_copy_undo_list (head)
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UNDO_LIST *head;
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{
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UNDO_LIST *list, *new, *roving, *c;
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if (head == 0)
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return head;
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list = head;
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new = 0;
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while (list)
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{
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c = _rl_copy_undo_entry (list);
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if (new == 0)
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roving = new = c;
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else
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{
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roving->next = c;
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roving = roving->next;
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}
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list = list->next;
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}
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roving->next = 0;
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return new;
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}
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/* Undo the next thing in the list. Return 0 if there
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is nothing to undo, or non-zero if there was. */
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int
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rl_do_undo ()
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{
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UNDO_LIST *release;
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int waiting_for_begin, start, end;
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#define TRANS(i) ((i) == -1 ? rl_point : ((i) == -2 ? rl_end : (i)))
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start = end = waiting_for_begin = 0;
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do
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{
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if (rl_undo_list == 0)
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return (0);
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_rl_doing_an_undo = 1;
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RL_SETSTATE(RL_STATE_UNDOING);
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/* To better support vi-mode, a start or end value of -1 means
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rl_point, and a value of -2 means rl_end. */
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if (rl_undo_list->what == UNDO_DELETE || rl_undo_list->what == UNDO_INSERT)
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{
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start = TRANS (rl_undo_list->start);
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end = TRANS (rl_undo_list->end);
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}
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switch (rl_undo_list->what)
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{
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/* Undoing deletes means inserting some text. */
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case UNDO_DELETE:
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rl_point = start;
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rl_insert_text (rl_undo_list->text);
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xfree (rl_undo_list->text);
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break;
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/* Undoing inserts means deleting some text. */
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case UNDO_INSERT:
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rl_delete_text (start, end);
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rl_point = start;
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break;
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/* Undoing an END means undoing everything 'til we get to a BEGIN. */
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case UNDO_END:
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waiting_for_begin++;
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break;
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/* Undoing a BEGIN means that we are done with this group. */
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case UNDO_BEGIN:
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if (waiting_for_begin)
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waiting_for_begin--;
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else
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rl_ding ();
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break;
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}
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_rl_doing_an_undo = 0;
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RL_UNSETSTATE(RL_STATE_UNDOING);
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release = rl_undo_list;
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rl_undo_list = rl_undo_list->next;
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replace_history_data (-1, (histdata_t *)release, (histdata_t *)rl_undo_list);
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xfree (release);
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}
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while (waiting_for_begin);
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return (1);
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}
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#undef TRANS
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int
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_rl_fix_last_undo_of_type (type, start, end)
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int type, start, end;
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{
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UNDO_LIST *rl;
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for (rl = rl_undo_list; rl; rl = rl->next)
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{
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if (rl->what == type)
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{
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rl->start = start;
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rl->end = end;
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return 0;
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}
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}
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return 1;
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}
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/* Begin a group. Subsequent undos are undone as an atomic operation. */
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int
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rl_begin_undo_group ()
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{
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rl_add_undo (UNDO_BEGIN, 0, 0, 0);
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_rl_undo_group_level++;
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return 0;
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}
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/* End an undo group started with rl_begin_undo_group (). */
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int
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rl_end_undo_group ()
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{
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rl_add_undo (UNDO_END, 0, 0, 0);
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_rl_undo_group_level--;
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return 0;
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}
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/* Save an undo entry for the text from START to END. */
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int
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rl_modifying (start, end)
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int start, end;
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{
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if (start > end)
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{
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SWAP (start, end);
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}
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if (start != end)
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{
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char *temp = rl_copy_text (start, end);
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rl_begin_undo_group ();
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rl_add_undo (UNDO_DELETE, start, end, temp);
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rl_add_undo (UNDO_INSERT, start, end, (char *)NULL);
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rl_end_undo_group ();
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}
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return 0;
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}
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/* Revert the current line to its previous state. */
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int
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rl_revert_line (count, key)
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int count, key;
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{
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if (rl_undo_list == 0)
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rl_ding ();
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else
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{
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while (rl_undo_list)
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rl_do_undo ();
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#if defined (VI_MODE)
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if (rl_editing_mode == vi_mode)
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rl_point = rl_mark = 0; /* rl_end should be set correctly */
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#endif
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}
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return 0;
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}
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/* Do some undoing of things that were done. */
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int
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rl_undo_command (count, key)
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int count, key;
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{
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if (count < 0)
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return 0; /* Nothing to do. */
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while (count)
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{
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if (rl_do_undo ())
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count--;
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else
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{
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rl_ding ();
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break;
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}
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}
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return 0;
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}
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