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nano/search.c

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/* $Id$ */
/**************************************************************************
* search.c *
* *
* Copyright (C) 2000-2002 Chris Allegretta *
* This program 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. *
* *
* This program 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. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software *
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
* *
**************************************************************************/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include "proto.h"
#include "nano.h"
#ifdef ENABLE_NLS
#include <libintl.h>
#define _(string) gettext(string)
#else
#define _(string) (string)
#endif
/* Regular expression helper functions */
#ifdef HAVE_REGEX_H
void regexp_init(const char *regexp)
{
regcomp(&search_regexp, regexp, ISSET(CASE_SENSITIVE) ? 0 : REG_ICASE);
SET(REGEXP_COMPILED);
}
void regexp_cleanup(void)
{
UNSET(REGEXP_COMPILED);
regfree(&search_regexp);
}
#endif
void search_init_globals(void)
{
if (last_search == NULL) {
last_search = charalloc(1);
last_search[0] = '\0';
}
if (last_replace == NULL) {
last_replace = charalloc(1);
last_replace[0] = '\0';
}
}
/* Set up the system variables for a search or replace. Returns -1 on
abort, 0 on success, and 1 on rerun calling program
Return -2 to run opposite program (search -> replace, replace -> search)
replacing = 1 if we call from do_replace, 0 if called from do_search func.
*/
int search_init(int replacing)
{
int i = 0;
char *buf;
static char *backupstring = NULL;
search_init_globals();
buf = charalloc(strlen(last_search) + 5);
buf[0] = '\0';
/* Clear the backupstring if we've changed from Pico mode to regular
mode */
if (ISSET(CLEAR_BACKUPSTRING)) {
free(backupstring);
backupstring = NULL;
UNSET(CLEAR_BACKUPSTRING);
}
/* Okay, fun time. backupstring is our holder for what is being
returned from the statusq call. Using answer for this would be tricky.
Here, if we're using PICO_MODE, we only want nano to put the
old string back up as editable if it's not the same as last_search.
Otherwise, if we don't already have a backupstring, set it to
last_search. */
if (ISSET(PICO_MODE)) {
if (backupstring == NULL || !strcmp(backupstring, last_search))
backupstring = mallocstrcpy(backupstring, "");
}
else if (backupstring == NULL)
backupstring = mallocstrcpy(backupstring, last_search);
/* If using Pico messages, we do things the old fashioned way... */
if (ISSET(PICO_MODE)) {
if (last_search[0]) {
/* We use COLS / 3 here because we need to see more on the line */
if (strlen(last_search) > COLS / 3) {
snprintf(buf, COLS / 3 + 3, " [%s", last_search);
sprintf(&buf[COLS / 3 + 2], "...]");
} else
sprintf(buf, " [%s]", last_search);
} else {
buf[0] = '\0';
}
}
else
buf[0] = '\0';
/* This is now one simple call. It just does a lot */
i = statusq(0, replacing ? replace_list : whereis_list, backupstring,
"%s%s%s%s%s%s",
_("Search"),
/* This string is just a modifier for the search prompt,
no grammar is implied */
ISSET(CASE_SENSITIVE) ? _(" [Case Sensitive]") : "",
/* This string is just a modifier for the search prompt,
no grammar is implied */
ISSET(USE_REGEXP) ? _(" [Regexp]") : "",
/* This string is just a modifier for the search prompt,
no grammar is implied */
ISSET(REVERSE_SEARCH) ? _(" [Backwards]") : "",
replacing ? _(" (to replace)") : "",
buf);
/* Release buf now that we don't need it anymore */
free(buf);
/* Cancel any search, or just return with no previous search */
if ((i == -1) || (i < 0 && !last_search[0])) {
statusbar(_("Search Cancelled"));
reset_cursor();
free(backupstring);
backupstring = NULL;
return -1;
} else
switch (i) {
case -2: /* Same string */
#ifdef HAVE_REGEX_H
if (ISSET(USE_REGEXP)) {
/* If we're in pico mode, answer is "", use last_search! */
if (ISSET(PICO_MODE))
regexp_init(last_search);
else
regexp_init(answer);
}
#endif
break;
case 0: /* They entered something new */
#ifdef HAVE_REGEX_H
if (ISSET(USE_REGEXP))
regexp_init(answer);
#endif
free(backupstring);
backupstring = NULL;
last_replace[0] = '\0';
break;
case TOGGLE_CASE_KEY:
TOGGLE(CASE_SENSITIVE);
goto string_reinit;
case TOGGLE_BACKWARDS_KEY:
TOGGLE(REVERSE_SEARCH);
goto string_reinit;
#ifdef HAVE_REGEX_H
case TOGGLE_REGEXP_KEY:
TOGGLE(USE_REGEXP);
#endif
string_reinit:
free(backupstring);
backupstring = NULL;
backupstring = mallocstrcpy(backupstring, answer);
return 1;
case NANO_OTHERSEARCH_KEY:
backupstring = mallocstrcpy(backupstring, answer);
return -2; /* Call the opposite search function */
case NANO_FROMSEARCHTOGOTO_KEY:
free(backupstring);
backupstring = NULL;
do_gotoline_void();
return -3;
default:
do_early_abort();
free(backupstring);
backupstring = NULL;
return -3;
}
return 0;
}
void not_found_msg(char *str)
{
if (strlen(str) <= COLS / 2)
statusbar(_("\"%s\" not found"), str);
else {
char *foo = NULL;
foo = mallocstrcpy(foo, str);
foo[COLS / 2] = '\0';
statusbar(_("\"%s...\" not found"), foo);
free(foo);
}
}
int is_whole_word(int curr_pos, filestruct *fileptr, char *searchword)
{
/* start of line or previous character not a letter */
if ((curr_pos < 1) || (!isalpha((int) fileptr->data[curr_pos-1])))
/* end of line or next character not a letter */
if (((curr_pos + strlen(searchword)) == strlen(fileptr->data))
|| (!isalpha((int) fileptr->data[curr_pos + strlen(searchword)])))
return TRUE;
return FALSE;
}
int past_editbuff; /* findnextstr() is now searching lines not displayed */
filestruct *findnextstr(int quiet, int bracket_mode, filestruct * begin, int beginx,
char *needle)
{
filestruct *fileptr = current;
char *searchstr, *rev_start = NULL, *found = NULL;
int current_x_find = 0;
past_editbuff = 0;
if (!ISSET(REVERSE_SEARCH)) { /* forward search */
current_x_find = current_x + 1;
#if 0
/* Are we now back to the place where the search started) */
if ((fileptr == begin) && (beginx > current_x_find))
search_last_line = 1;
#endif
/* Make sure we haven't passed the end of the string */
if (strlen(fileptr->data) < current_x_find)
current_x_find--;
searchstr = &fileptr->data[current_x_find];
/* Look for needle in searchstr */
while ((found = strstrwrapper(searchstr, needle, rev_start, current_x_find)) == NULL) {
/* finished processing file, get out */
if (search_last_line) {
if (!quiet)
not_found_msg(needle);
update_line(fileptr, current_x);
return NULL;
}
update_line(fileptr, 0);
/* reset current_x_find between lines */
current_x_find = 0;
fileptr = fileptr->next;
if (fileptr == editbot)
past_editbuff = 1;
/* EOF reached ?, wrap around once */
if (fileptr == NULL) {
/* don't wrap if looking for bracket match */
if (bracket_mode)
return NULL;
fileptr = fileage;
past_editbuff = 1;
if (!quiet) {
statusbar(_("Search Wrapped"));
SET(DISABLE_CURPOS);
}
}
/* Original start line reached */
if (fileptr == begin)
search_last_line = 1;
searchstr = fileptr->data;
}
/* We found an instance */
current_x_find = found - fileptr->data;
#if 1
/* Ensure we haven't wrapped around again! */
if ((search_last_line) && (current_x_find > beginx)) {
if (!quiet)
not_found_msg(needle);
return NULL;
}
#endif
}
#ifndef NANO_SMALL
else { /* reverse search */
current_x_find = current_x - 1;
#if 0
/* Are we now back to the place where the search started) */
if ((fileptr == begin) && (current_x_find > beginx))
search_last_line = 1;
#endif
/* Make sure we haven't passed the begining of the string */
#if 0 /* Is this required here ? */
if (!(&fileptr->data[current_x_find] - fileptr->data))
current_x_find++;
#endif
rev_start = &fileptr->data[current_x_find];
searchstr = fileptr->data;
/* Look for needle in searchstr */
while ((found = strstrwrapper(searchstr, needle, rev_start, current_x_find)) == NULL) {
/* finished processing file, get out */
if (search_last_line) {
if (!quiet)
not_found_msg(needle);
return NULL;
}
update_line(fileptr, 0);
/* reset current_x_find between lines */
current_x_find = 0;
fileptr = fileptr->prev;
if (fileptr == edittop->prev)
past_editbuff = 1;
/* SOF reached ?, wrap around once */
/* ? */ if (fileptr == NULL) {
if (bracket_mode)
return NULL;
fileptr = filebot;
past_editbuff = 1;
if (!quiet) {
statusbar(_("Search Wrapped"));
SET(DISABLE_CURPOS);
}
}
/* Original start line reached */
if (fileptr == begin)
search_last_line = 1;
searchstr = fileptr->data;
rev_start = fileptr->data + strlen(fileptr->data);
}
/* We found an instance */
current_x_find = found - fileptr->data;
#if 1
/* Ensure we haven't wrapped around again! */
if ((search_last_line) && (current_x_find < beginx)) {
if (!quiet)
not_found_msg(needle);
return NULL;
}
#endif
}
#endif /* NANO_SMALL */
/* Set globals now that we are sure we found something */
current = fileptr;
current_x = current_x_find;
if (!bracket_mode) {
if (past_editbuff)
edit_update(fileptr, CENTER);
else
update_line(current, current_x);
placewewant = xplustabs();
reset_cursor();
}
return fileptr;
}
void search_abort(void)
{
UNSET(KEEP_CUTBUFFER);
display_main_list();
wrefresh(bottomwin);
if (ISSET(MARK_ISSET))
edit_refresh_clearok();
#ifdef HAVE_REGEX_H
if (ISSET(REGEXP_COMPILED))
regexp_cleanup();
#endif
}
/* Search for a string */
int do_search(void)
{
int i;
filestruct *fileptr = current, *didfind;
int fileptr_x = current_x;
wrap_reset();
i = search_init(0);
switch (i) {
case -1:
current = fileptr;
search_abort();
return 0;
case -3:
search_abort();
return 0;
case -2:
do_replace();
return 0;
case 1:
do_search();
search_abort();
return 1;
}
/* The sneaky user deleted the previous search string */
if (!ISSET(PICO_MODE) && answer[0] == '\0') {
statusbar(_("Search Cancelled"));
search_abort();
return 0;
}
/* If answer is now == "", then PICO_MODE is set. So, copy
last_search into answer... */
if (answer[0] == '\0')
answer = mallocstrcpy(answer, last_search);
else
last_search = mallocstrcpy(last_search, answer);
search_last_line = 0;
didfind = findnextstr(FALSE, FALSE, current, current_x, answer);
if ((fileptr == current) && (fileptr_x == current_x) &&
didfind != NULL)
statusbar(_("This is the only occurrence"));
search_abort();
return 1;
}
void print_replaced(int num)
{
if (num > 1)
statusbar(_("Replaced %d occurrences"), num);
else if (num == 1)
statusbar(_("Replaced 1 occurrence"));
}
void replace_abort(void)
{
/* Identical to search_abort, so we'll call it here. If it
does something different later, we can change it back. For now
it's just a waste to duplicate code */
search_abort();
placewewant = xplustabs();
}
#ifdef HAVE_REGEX_H
int replace_regexp(char *string, int create_flag)
{
/* split personality here - if create_flag is null, just calculate
* the size of the replacement line (necessary because of
* subexpressions like \1 \2 \3 in the replaced text) */
char *c;
int new_size = strlen(current->data) + 1;
int search_match_count = regmatches[0].rm_eo - regmatches[0].rm_so;
new_size -= search_match_count;
/* Iterate through the replacement text to handle
* subexpression replacement using \1, \2, \3, etc */
c = last_replace;
while (*c) {
if (*c != '\\') {
if (create_flag)
*string++ = *c;
c++;
new_size++;
} else {
int num = (int) *(c + 1) - (int) '0';
if (num >= 1 && num <= 9) {
int i = regmatches[num].rm_so;
if (num > search_regexp.re_nsub) {
/* Ugh, they specified a subexpression that doesn't
exist. */
return -1;
}
/* Skip over the replacement expression */
c += 2;
/* But add the length of the subexpression to new_size */
new_size += regmatches[num].rm_eo - regmatches[num].rm_so;
/* And if create_flag is set, append the result of the
* subexpression match to the new line */
while (create_flag && i < regmatches[num].rm_eo)
*string++ = *(current->data + i++);
} else {
if (create_flag)
*string++ = *c;
c++;
new_size++;
}
}
}
if (create_flag)
*string = 0;
return new_size;
}
#endif
char *replace_line(void)
{
char *copy, *tmp;
int new_line_size;
int search_match_count;
/* Calculate size of new line */
#ifdef HAVE_REGEX_H
if (ISSET(USE_REGEXP)) {
search_match_count = regmatches[0].rm_eo - regmatches[0].rm_so;
new_line_size = replace_regexp(NULL, 0);
/* If they specified an invalid subexpression in the replace
* text, return NULL, indicating an error */
if (new_line_size < 0)
return NULL;
} else {
#else
{
#endif
search_match_count = strlen(last_search);
new_line_size = strlen(current->data) - strlen(last_search) +
strlen(last_replace) + 1;
}
/* Create buffer */
copy = charalloc(new_line_size);
/* Head of Original Line */
strncpy(copy, current->data, current_x);
copy[current_x] = '\0';
/* Replacement Text */
if (!ISSET(USE_REGEXP))
strcat(copy, last_replace);
#ifdef HAVE_REGEX_H
else
(void) replace_regexp(copy + current_x, 1);
#endif
/* The tail of the original line */
/* This may expose other bugs, because it no longer
goes through each character in the string
and tests for string goodness. But because
we can assume the invariant that current->data
is less than current_x + strlen(last_search) long,
this should be safe. Or it will expose bugs ;-) */
tmp = current->data + current_x + search_match_count;
strcat(copy, tmp);
return copy;
}
/* step through each replace word and prompt user before replacing word */
int do_replace_loop(char *prevanswer, filestruct *begin, int *beginx,
int wholewords, int *i)
{
int replaceall = 0, numreplaced = 0;
filestruct *fileptr = NULL;
char *copy;
switch (*i) {
case -1: /* Aborted enter */
if (last_replace[0] != '\0')
answer = mallocstrcpy(answer, last_replace);
statusbar(_("Replace Cancelled"));
replace_abort();
return 0;
case 0: /* They actually entered something */
break;
default:
if (*i != -2) { /* First page, last page, for example
could get here */
do_early_abort();
replace_abort();
return 0;
}
}
if (ISSET(PICO_MODE) && answer[0] == '\0')
answer = mallocstrcpy(answer, last_replace);
last_replace = mallocstrcpy(last_replace, answer);
while (1) {
/* Sweet optimization by Rocco here */
#if 0
fileptr = findnextstr(replaceall, FALSE, begin, *beginx, prevanswer);
#else
if (fileptr != 0)
fileptr = findnextstr(1, FALSE, begin, *beginx, prevanswer);
else
fileptr = findnextstr(replaceall || (search_last_line ? 1 : 0), FALSE, begin, *beginx, prevanswer);
#endif
/* No more matches. Done! */
if (!fileptr)
break;
/* Make sure only whole words are found */
if ((wholewords) && (!is_whole_word(current_x, fileptr, prevanswer)))
continue;
/* If we're here, we've found the search string */
if (!replaceall) {
curs_set(0);
do_replace_highlight(TRUE, prevanswer);
*i = do_yesno(1, 1, _("Replace this instance?"));
do_replace_highlight(FALSE, prevanswer);
curs_set(1);
}
if (*i > 0 || replaceall) { /* Yes, replace it!!!! */
if (*i == 2)
replaceall = 1;
copy = replace_line();
if (!copy) {
statusbar(_("Replace failed: unknown subexpression!"));
replace_abort();
return 0;
}
/* Cleanup */
totsize -= strlen(current->data);
free(current->data);
current->data = copy;
totsize += strlen(current->data);
if (!ISSET(REVERSE_SEARCH)) {
/* Stop bug where we replace a substring of the replacement text */
current_x += strlen(last_replace) - 1;
/* Adjust the original cursor position - COULD BE IMPROVED */
if (search_last_line) {
*beginx += strlen(last_replace) - strlen(last_search);
/* For strings that cross the search start/end boundary */
/* Don't go outside of allocated memory */
if (*beginx < 1)
*beginx = 1;
}
} else {
if (current_x > 1)
current_x--;
if (search_last_line) {
*beginx += strlen(last_replace) - strlen(last_search);
if (*beginx > strlen(current->data))
*beginx = strlen(current->data);
}
}
edit_refresh();
set_modified();
numreplaced++;
} else if (*i == -1) /* Abort, else do nothing and continue loop */
break;
}
return numreplaced;
}
/* Replace a string */
int do_replace(void)
{
int i, numreplaced, beginx;
filestruct *begin;
char *prevanswer = NULL, *buf = NULL;
if (ISSET(VIEW_MODE)) {
print_view_warning();
replace_abort();
return 0;
}
i = search_init(1);
switch (i) {
case -1:
statusbar(_("Replace Cancelled"));
replace_abort();
return 0;
case 1:
do_replace();
return 1;
case -2:
do_search();
return 0;
case -3:
replace_abort();
return 0;
}
/* Again, there was a previous string, but they deleted it and hit enter */
if (!ISSET(PICO_MODE) && answer[0] == '\0') {
statusbar(_("Replace Cancelled"));
replace_abort();
return 0;
}
/* If answer is now == "", then PICO_MODE is set. So, copy
last_search into answer (and prevanswer)... */
if (answer[0] == '\0') {
answer = mallocstrcpy(answer, last_search);
prevanswer = mallocstrcpy(prevanswer, last_search);
} else {
last_search = mallocstrcpy(last_search, answer);
prevanswer = mallocstrcpy(prevanswer, answer);
}
if (ISSET(PICO_MODE)) {
buf = charalloc(strlen(last_replace) + 5);
if (last_replace[0] != '\0') {
if (strlen(last_replace) > (COLS / 3)) {
strncpy(buf, last_replace, COLS / 3);
sprintf(&buf[COLS / 3 - 1], "...");
} else
sprintf(buf, "%s", last_replace);
i = statusq(0, replace_list_2, "",
_("Replace with [%s]"), buf);
}
else
i = statusq(0, replace_list_2, "",
_("Replace with"));
}
else
i = statusq(0, replace_list_2, last_replace,
_("Replace with"));
/* save where we are */
begin = current;
#if 0
/* why + 1 ? isn't this taken care of in findnextstr() ? */
beginx = current_x + 1;
#else
beginx = current_x;
#endif
search_last_line = 0;
numreplaced = do_replace_loop(prevanswer, begin, &beginx, FALSE, &i);
/* restore where we were */
current = begin;
#if 0
current_x = beginx - 1;
#else
current_x = beginx;
#endif
renumber_all();
edit_update(current, CENTER);
print_replaced(numreplaced);
replace_abort();
return 1;
}
void goto_abort(void)
{
UNSET(KEEP_CUTBUFFER);
display_main_list();
}
int do_gotoline(int line, int save_pos)
{
if (line <= 0) { /* Ask for it */
if (statusq(0, goto_list, "", _("Enter line number"))) {
statusbar(_("Aborted"));
goto_abort();
return 0;
}
line = atoi(answer);
/* Bounds check */
if (line <= 0) {
statusbar(_("Come on, be reasonable"));
goto_abort();
return 0;
}
}
for (current = fileage; current->next != NULL && line > 1; line--)
current = current->next;
current_x = 0;
/* if save_pos is non-zero, don't change the cursor position when
updating the edit window */
if (save_pos)
edit_update(current, NONE);
else
edit_update(current, CENTER);
placewewant = 0;
goto_abort();
return 1;
}
int do_gotoline_void(void)
{
return do_gotoline(0, 0);
}
#if defined(ENABLE_MULTIBUFFER) || !defined(DISABLE_SPELLER)
void do_gotopos(int line, int pos_x, int pos_y, int pos_placewewant)
{
/* since do_gotoline() resets the x-coordinate but not the
y-coordinate, set the coordinates up this way */
current_y = pos_y;
do_gotoline(line, 1);
/* make sure that the x-coordinate is sane here */
if (pos_x > strlen(current->data))
pos_x = strlen(current->data);
/* set the rest of the coordinates up */
current_x = pos_x;
placewewant = pos_placewewant;
update_line(current, pos_x);
}
#endif
#if !defined(NANO_SMALL) && defined(HAVE_REGEX_H)
int do_find_bracket(void)
{
char ch_under_cursor, wanted_ch;
char *pos, *brackets = "([{<>}])";
char regexp_pat[] = "[ ]";
int offset, have_past_editbuff = 0, flagsave, current_x_save, count = 1;
filestruct *current_save;
ch_under_cursor = current->data[current_x];
if ((!(pos = strchr(brackets, ch_under_cursor))) || (!((offset = pos - brackets) < 8))) {
statusbar(_("Not a bracket"));
return 1;
}
blank_statusbar_refresh();
wanted_ch = *(brackets + ((strlen(brackets) - (offset + 1))));
current_x_save = current_x;
current_save = current;
flagsave = flags;
SET(USE_REGEXP);
/* apparent near redundancy with regexp_pat[] here is needed, [][] works, [[]] doesn't */
if (offset < (strlen(brackets) / 2)) { /* on a left bracket */
regexp_pat[1] = wanted_ch;
regexp_pat[2] = ch_under_cursor;
UNSET(REVERSE_SEARCH);
} else { /* on a right bracket */
regexp_pat[1] = ch_under_cursor;
regexp_pat[2] = wanted_ch;
SET(REVERSE_SEARCH);
}
regexp_init(regexp_pat);
while (1) {
search_last_line = 0;
if (findnextstr(1, 1, current, current_x, regexp_pat)) {
have_past_editbuff |= past_editbuff;
if (current->data[current_x] == ch_under_cursor) /* found identical bracket */
count++;
else { /* found complementary bracket */
if (!(--count)) {
if (have_past_editbuff)
edit_update(current, CENTER);
else
update_line(current, current_x);
placewewant = xplustabs();
reset_cursor();
break ;
}
}
} else { /* didn't find either left or right bracket */
statusbar(_("No matching bracket"));
current_x = current_x_save;
current = current_save;
break;
}
}
if (ISSET(REGEXP_COMPILED))
regexp_cleanup();
flags = flagsave;
return 0;
}
#endif
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