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"
52 #define SWAP(s, e) do { int t; t = s; s = e; e = t; } while (0)
54 /* Non-zero tells rl_delete_text and rl_insert_text to not add to
56 int _rl_doing_an_undo
= 0;
58 /* How many unclosed undo groups we currently have. */
59 int _rl_undo_group_level
= 0;
61 /* The current undo list for THE_LINE. */
62 UNDO_LIST
*rl_undo_list
= (UNDO_LIST
*)NULL
;
64 /* **************************************************************** */
66 /* Undo, and Undoing */
68 /* **************************************************************** */
70 /* Remember how to undo something. Concatenate some undos if that
73 rl_add_undo (what
, start
, end
, text
)
78 UNDO_LIST
*temp
= (UNDO_LIST
*)xmalloc (sizeof (UNDO_LIST
));
83 temp
->next
= rl_undo_list
;
87 /* Free the existing undo list. */
93 UNDO_LIST
*release
= rl_undo_list
;
94 rl_undo_list
= rl_undo_list
->next
;
96 if (release
->what
== UNDO_DELETE
)
101 rl_undo_list
= (UNDO_LIST
*)NULL
;
104 /* Undo the next thing in the list. Return 0 if there
105 is nothing to undo, or non-zero if there was. */
110 int waiting_for_begin
= 0;
113 #define TRANS(i) ((i) == -1 ? rl_point : ((i) == -2 ? rl_end : (i)))
120 _rl_doing_an_undo
= 1;
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;
161 release
= rl_undo_list
;
162 rl_undo_list
= rl_undo_list
->next
;
165 while (waiting_for_begin
);
172 _rl_fix_last_undo_of_type (type
, start
, end
)
173 int type
, start
, end
;
177 for (rl
= rl_undo_list
; rl
; rl
= rl
->next
)
179 if (rl
->what
== type
)
189 /* Begin a group. Subsequent undos are undone as an atomic operation. */
191 rl_begin_undo_group ()
193 rl_add_undo (UNDO_BEGIN
, 0, 0, 0);
194 _rl_undo_group_level
++;
198 /* End an undo group started with rl_begin_undo_group (). */
202 rl_add_undo (UNDO_END
, 0, 0, 0);
203 _rl_undo_group_level
--;
207 /* Save an undo entry for the text from START to END. */
209 rl_modifying (start
, end
)
219 char *temp
= rl_copy_text (start
, end
);
220 rl_begin_undo_group ();
221 rl_add_undo (UNDO_DELETE
, start
, end
, temp
);
222 rl_add_undo (UNDO_INSERT
, start
, end
, (char *)NULL
);
223 rl_end_undo_group ();
228 /* Revert the current line to its previous state. */
230 rl_revert_line (count
, key
)
243 /* Do some undoing of things that were done. */
245 rl_undo_command (count
, key
)
249 return 0; /* Nothing to do. */
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