| /* readline.c -- a general facility for reading lines of input |
| with emacs style editing and completion. */ |
| |
| /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. |
| |
| This file is part of the GNU Readline Library, a library for |
| reading lines of text with interactive input and history editing. |
| |
| The GNU Readline Library is free software; you can redistribute it |
| and/or modify it under the terms of the GNU General Public License |
| as published by the Free Software Foundation; either version 2, or |
| (at your option) any later version. |
| |
| The GNU Readline Library is distributed in the hope that it will be |
| useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
| of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| The GNU General Public License is often shipped with GNU software, and |
| is generally kept in a file called COPYING or LICENSE. If you do not |
| have a copy of the license, write to the Free Software Foundation, |
| 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
| #define READLINE_LIBRARY |
| |
| #if defined (HAVE_CONFIG_H) |
| # include <config.h> |
| #endif |
| |
| #include <sys/types.h> |
| |
| #if defined (HAVE_UNISTD_H) |
| # include <unistd.h> /* for _POSIX_VERSION */ |
| #endif /* HAVE_UNISTD_H */ |
| |
| #if defined (HAVE_STDLIB_H) |
| # include <stdlib.h> |
| #else |
| # include "ansi_stdlib.h" |
| #endif /* HAVE_STDLIB_H */ |
| |
| #include <stdio.h> |
| |
| /* System-specific feature definitions and include files. */ |
| #include "rldefs.h" |
| |
| /* Some standard library routines. */ |
| #include "readline.h" |
| #include "history.h" |
| |
| #include "rlprivate.h" |
| #include "xmalloc.h" |
| |
| /* Non-zero tells rl_delete_text and rl_insert_text to not add to |
| the undo list. */ |
| int _rl_doing_an_undo = 0; |
| |
| /* How many unclosed undo groups we currently have. */ |
| int _rl_undo_group_level = 0; |
| |
| /* The current undo list for THE_LINE. */ |
| UNDO_LIST *rl_undo_list = (UNDO_LIST *)NULL; |
| |
| /* **************************************************************** */ |
| /* */ |
| /* Undo, and Undoing */ |
| /* */ |
| /* **************************************************************** */ |
| |
| /* Remember how to undo something. Concatenate some undos if that |
| seems right. */ |
| void |
| rl_add_undo (what, start, end, text) |
| enum undo_code what; |
| int start, end; |
| char *text; |
| { |
| UNDO_LIST *temp = (UNDO_LIST *)xmalloc (sizeof (UNDO_LIST)); |
| temp->what = what; |
| temp->start = start; |
| temp->end = end; |
| temp->text = text; |
| temp->next = rl_undo_list; |
| rl_undo_list = temp; |
| } |
| |
| /* Free the existing undo list. */ |
| void |
| rl_free_undo_list () |
| { |
| while (rl_undo_list) |
| { |
| UNDO_LIST *release = rl_undo_list; |
| rl_undo_list = rl_undo_list->next; |
| |
| if (release->what == UNDO_DELETE) |
| free (release->text); |
| |
| free (release); |
| } |
| rl_undo_list = (UNDO_LIST *)NULL; |
| } |
| |
| /* Undo the next thing in the list. Return 0 if there |
| is nothing to undo, or non-zero if there was. */ |
| int |
| rl_do_undo () |
| { |
| UNDO_LIST *release; |
| int waiting_for_begin, start, end; |
| |
| #define TRANS(i) ((i) == -1 ? rl_point : ((i) == -2 ? rl_end : (i))) |
| |
| start = end = waiting_for_begin = 0; |
| do |
| { |
| if (!rl_undo_list) |
| return (0); |
| |
| _rl_doing_an_undo = 1; |
| RL_SETSTATE(RL_STATE_UNDOING); |
| |
| /* To better support vi-mode, a start or end value of -1 means |
| rl_point, and a value of -2 means rl_end. */ |
| if (rl_undo_list->what == UNDO_DELETE || rl_undo_list->what == UNDO_INSERT) |
| { |
| start = TRANS (rl_undo_list->start); |
| end = TRANS (rl_undo_list->end); |
| } |
| |
| switch (rl_undo_list->what) |
| { |
| /* Undoing deletes means inserting some text. */ |
| case UNDO_DELETE: |
| rl_point = start; |
| rl_insert_text (rl_undo_list->text); |
| free (rl_undo_list->text); |
| break; |
| |
| /* Undoing inserts means deleting some text. */ |
| case UNDO_INSERT: |
| rl_delete_text (start, end); |
| rl_point = start; |
| break; |
| |
| /* Undoing an END means undoing everything 'til we get to a BEGIN. */ |
| case UNDO_END: |
| waiting_for_begin++; |
| break; |
| |
| /* Undoing a BEGIN means that we are done with this group. */ |
| case UNDO_BEGIN: |
| if (waiting_for_begin) |
| waiting_for_begin--; |
| else |
| rl_ding (); |
| break; |
| } |
| |
| _rl_doing_an_undo = 0; |
| RL_UNSETSTATE(RL_STATE_UNDOING); |
| |
| release = rl_undo_list; |
| rl_undo_list = rl_undo_list->next; |
| free (release); |
| } |
| while (waiting_for_begin); |
| |
| return (1); |
| } |
| #undef TRANS |
| |
| int |
| _rl_fix_last_undo_of_type (type, start, end) |
| int type, start, end; |
| { |
| UNDO_LIST *rl; |
| |
| for (rl = rl_undo_list; rl; rl = rl->next) |
| { |
| if (rl->what == type) |
| { |
| rl->start = start; |
| rl->end = end; |
| return 0; |
| } |
| } |
| return 1; |
| } |
| |
| /* Begin a group. Subsequent undos are undone as an atomic operation. */ |
| int |
| rl_begin_undo_group () |
| { |
| rl_add_undo (UNDO_BEGIN, 0, 0, 0); |
| _rl_undo_group_level++; |
| return 0; |
| } |
| |
| /* End an undo group started with rl_begin_undo_group (). */ |
| int |
| rl_end_undo_group () |
| { |
| rl_add_undo (UNDO_END, 0, 0, 0); |
| _rl_undo_group_level--; |
| return 0; |
| } |
| |
| /* Save an undo entry for the text from START to END. */ |
| int |
| rl_modifying (start, end) |
| int start, end; |
| { |
| if (start > end) |
| { |
| SWAP (start, end); |
| } |
| |
| if (start != end) |
| { |
| char *temp = rl_copy_text (start, end); |
| rl_begin_undo_group (); |
| rl_add_undo (UNDO_DELETE, start, end, temp); |
| rl_add_undo (UNDO_INSERT, start, end, (char *)NULL); |
| rl_end_undo_group (); |
| } |
| return 0; |
| } |
| |
| /* Revert the current line to its previous state. */ |
| int |
| rl_revert_line (count, key) |
| int count, key; |
| { |
| if (!rl_undo_list) |
| rl_ding (); |
| else |
| { |
| while (rl_undo_list) |
| rl_do_undo (); |
| #if defined (VI_MODE) |
| if (rl_editing_mode == vi_mode) |
| rl_point = rl_mark = 0; /* rl_end should be set correctly */ |
| #endif |
| } |
| |
| return 0; |
| } |
| |
| /* Do some undoing of things that were done. */ |
| int |
| rl_undo_command (count, key) |
| int count, key; |
| { |
| if (count < 0) |
| return 0; /* Nothing to do. */ |
| |
| while (count) |
| { |
| if (rl_do_undo ()) |
| count--; |
| else |
| { |
| rl_ding (); |
| break; |
| } |
| } |
| return 0; |
| } |