1 /* readline.c -- a general facility for reading lines of input
2 with emacs style editing and completion. */
4 /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
6 This file is part of the GNU Readline Library, a library for
7 reading lines of text with interactive input and history editing.
9 The GNU Readline Library is free software; you can redistribute it
10 and/or modify it under the terms of the GNU General Public License
11 as published by the Free Software Foundation; either version 2, or
12 (at your option) any later version.
14 The GNU Readline Library is distributed in the hope that it will be
15 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
16 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 The GNU General Public License is often shipped with GNU software, and
20 is generally kept in a file called COPYING or LICENSE. If you do not
21 have a copy of the license, write to the Free Software Foundation,
22 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
23 #define READLINE_LIBRARY
25 #if defined (HAVE_CONFIG_H)
29 #include <sys/types.h>
31 #if defined (HAVE_UNISTD_H)
32 # include <unistd.h> /* for _POSIX_VERSION */
33 #endif /* HAVE_UNISTD_H */
35 #if defined (HAVE_STDLIB_H)
38 # include "ansi_stdlib.h"
39 #endif /* HAVE_STDLIB_H */
43 /* System-specific feature definitions and include files. */
46 /* Some standard library routines. */
50 #include "rlprivate.h"
53 /* Non-zero tells rl_delete_text and rl_insert_text to not add to
55 int _rl_doing_an_undo
= 0;
57 /* How many unclosed undo groups we currently have. */
58 int _rl_undo_group_level
= 0;
60 /* The current undo list for THE_LINE. */
61 UNDO_LIST
*rl_undo_list
= (UNDO_LIST
*)NULL
;
63 /* **************************************************************** */
65 /* Undo, and Undoing */
67 /* **************************************************************** */
69 /* Remember how to undo something. Concatenate some undos if that
72 rl_add_undo (what
, start
, end
, text
)
77 UNDO_LIST
*temp
= (UNDO_LIST
*)xmalloc (sizeof (UNDO_LIST
));
82 temp
->next
= rl_undo_list
;
86 /* Free the existing undo list. */
92 UNDO_LIST
*release
= rl_undo_list
;
93 rl_undo_list
= rl_undo_list
->next
;
95 if (release
->what
== UNDO_DELETE
)
100 rl_undo_list
= (UNDO_LIST
*)NULL
;
103 /* Undo the next thing in the list. Return 0 if there
104 is nothing to undo, or non-zero if there was. */
109 int waiting_for_begin
, start
, end
;
111 #define TRANS(i) ((i) == -1 ? rl_point : ((i) == -2 ? rl_end : (i)))
113 start
= end
= waiting_for_begin
= 0;
119 _rl_doing_an_undo
= 1;
120 RL_SETSTATE(RL_STATE_UNDOING
);
122 /* To better support vi-mode, a start or end value of -1 means
123 rl_point, and a value of -2 means rl_end. */
124 if (rl_undo_list
->what
== UNDO_DELETE
|| rl_undo_list
->what
== UNDO_INSERT
)
126 start
= TRANS (rl_undo_list
->start
);
127 end
= TRANS (rl_undo_list
->end
);
130 switch (rl_undo_list
->what
)
132 /* Undoing deletes means inserting some text. */
135 rl_insert_text (rl_undo_list
->text
);
136 free (rl_undo_list
->text
);
139 /* Undoing inserts means deleting some text. */
141 rl_delete_text (start
, end
);
145 /* Undoing an END means undoing everything 'til we get to a BEGIN. */
150 /* Undoing a BEGIN means that we are done with this group. */
152 if (waiting_for_begin
)
159 _rl_doing_an_undo
= 0;
160 RL_UNSETSTATE(RL_STATE_UNDOING
);
162 release
= rl_undo_list
;
163 rl_undo_list
= rl_undo_list
->next
;
166 while (waiting_for_begin
);
173 _rl_fix_last_undo_of_type (type
, start
, end
)
174 int type
, start
, end
;
178 for (rl
= rl_undo_list
; rl
; rl
= rl
->next
)
180 if (rl
->what
== type
)
190 /* Begin a group. Subsequent undos are undone as an atomic operation. */
192 rl_begin_undo_group ()
194 rl_add_undo (UNDO_BEGIN
, 0, 0, 0);
195 _rl_undo_group_level
++;
199 /* End an undo group started with rl_begin_undo_group (). */
203 rl_add_undo (UNDO_END
, 0, 0, 0);
204 _rl_undo_group_level
--;
208 /* Save an undo entry for the text from START to END. */
210 rl_modifying (start
, end
)
220 char *temp
= rl_copy_text (start
, end
);
221 rl_begin_undo_group ();
222 rl_add_undo (UNDO_DELETE
, start
, end
, temp
);
223 rl_add_undo (UNDO_INSERT
, start
, end
, (char *)NULL
);
224 rl_end_undo_group ();
229 /* Revert the current line to its previous state. */
231 rl_revert_line (count
, key
)
240 #if defined (VI_MODE)
241 if (rl_editing_mode
== vi_mode
)
242 rl_point
= rl_mark
= 0; /* rl_end should be set correctly */
249 /* Do some undoing of things that were done. */
251 rl_undo_command (count
, key
)
255 return 0; /* Nothing to do. */
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