/* 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 (); } 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; }