/*
* A special insert used as the undo of delete char (C-d or DEL)
* this is where the char is inserted at the point and the cursor
* is NOT moved on 1 char. This MUST be a seperate function so that
* INSERT + BACKSPACE are matching undo pairs
* INSERT_AT + DELETE are matching undo pairs
* Note: This function is only ever called by execute_undo to undo a DEL.
*/
void insert_at()
{
char_t the_char[2]; /* the inserted char plus a null */
assert(curbp->b_gap <= curbp->b_egap);
if (curbp->b_gap == curbp->b_egap && !growgap(curbp, CHUNK))
return;
curbp->b_point = movegap(curbp, curbp->b_point);
/* overwrite if mid line, not EOL or EOF, CR will insert as normal */
if ((curbp->b_flags & B_OVERWRITE) && *input != '\r' && *(ptr(curbp, curbp->b_point)) != '\n' && curbp->b_point < pos(curbp,curbp->b_ebuf) ) {
*(ptr(curbp, curbp->b_point)) = *input;
if (curbp->b_point < pos(curbp, curbp->b_ebuf))
++curbp->b_point;
/* FIXME - overwite mode not handled properly for undo yet */
} else {
the_char[0] = *input == '\r' ? '\n' : *input;
the_char[1] = '\0'; /* null terminate */
*curbp->b_gap++ = the_char[0];
curbp->b_point = pos(curbp, curbp->b_egap);
curbp->b_point--; /* move point back to where it was before, should always be safe */
/* the point is set so that and undo will DELETE the char */
add_undo(curbp, UNDO_T_INSAT, curbp->b_point, the_char, NULL);
}
add_mode(curbp, B_MODIFIED);
}
void backsp()
{
curbp->b_point = movegap(curbp, curbp->b_point);
undoset();
if (curbp->b_buf < curbp->b_gap) {
--curbp->b_gap;
curbp->b_flags |= B_MODIFIED;
}
curbp->b_point = pos(curbp, curbp->b_egap);
}
int main(int argc, char **argv)
{
int i;
if (argc < 2) { dprintf(2,"usage: edit file\n"); exit(-1); }
initscr();
keypad(1);
ebuf = egap = BUF;
if ((i = open(filename = argv[1], O_RDONLY)) >= 0) {
if ((gap = read(i, buf, BUF)) < 0) gap = 0;
close(i);
}
// for (gap = 0; (n = read(i, buf + gap, BUF - gap)) > 0; gap += n) ;
// for (p = buf; p < buf + gap && (p = memchr(p, '\n', gap - p)); lines++, p++) ;
for (;;) {
display();
switch (i = getch())
{
case KEY_UP: x = prev(prev(x) - 1); adjust(); break;
case KEY_DOWN: next(); adjust(); break;
case KEY_LEFT: if (x > 0) x--; break;
case KEY_RIGHT: if (x < ebuf + gap - egap) x++; break;
case KEY_PPAGE: x = prev(x); for (i=0; i<LINES-2; i++) { up(); x = prev(x - 1); } adjust(); break;
case KEY_NPAGE: for (i=0; i<LINES-2; i++) { down(); next(); } page = prev(page); adjust(); break;
case KEY_HOME: x = page = 0; line = 1; break;
case KEY_END: x = ebuf + gap - egap; break;
case KEY_DC: if (x == ebuf + gap - egap) break; if (x != gap) movegap(); if (buf[egap] == '\n') lines--; egap++; pagex = -1; break; // XXX del \r\n
case KEY_F1: save(); break;
case '\e': goto done;
case '\b': if (x == 0) break; if (x != gap) movegap(); gap--; x = gap; if (buf[gap] == '\n') lines--; pagex = -1; break;
case '\r': if (gap == egap) break; if (x != gap) movegap(); buf[gap++] = '\n'; lines++; x = gap; pagex = -1; break;
default: if (gap == egap) break; if (x != gap) movegap(); buf[gap++] = i; x = gap; pagex = -1; break;
}
}
done:
endwin();
return 0;
}
void insert()
{
assert(curbp->b_gap <= curbp->b_egap);
if (curbp->b_gap == curbp->b_egap && !growgap(curbp, CHUNK))
return;
curbp->b_point = movegap(curbp, curbp->b_point);
/* overwrite if mid line, not EOL or EOF, CR will insert as normal */
if ((curbp->b_flags & B_OVERWRITE) && input != '\r' && *(ptr(curbp, curbp->b_point)) != '\n' && curbp->b_point < pos(curbp,curbp->b_ebuf) ) {
*(ptr(curbp, curbp->b_point)) = input;
if (curbp->b_point < pos(curbp, curbp->b_ebuf))
++curbp->b_point;
} else {
*curbp->b_gap++ = input == '\r' ? '\n' : input;
curbp->b_point = pos(curbp, curbp->b_egap);
}
curbp->b_flags |= B_MODIFIED;
}
void backspace()
{
char_t the_char[7]; /* the deleted char, allow 6 unsigned chars plus a null */
int n = prev_utf8_char_size();
curbp->b_point = movegap(curbp, curbp->b_point);
if (curbp->b_buf < (curbp->b_gap - (n - 1)) ) {
curbp->b_gap -= n; /* increase start of gap by size of char */
add_mode(curbp, B_MODIFIED);
/* record the backspaced chars in the undo structure */
memcpy(the_char, curbp->b_gap, n);
the_char[n] = '\0'; /* null terminate, the backspaced char(s) */
curbp->b_point = pos(curbp, curbp->b_egap);
//debug("point after bs = %ld\n", curbp->b_point);
add_undo(curbp, UNDO_T_BACKSPACE, curbp->b_point, the_char, NULL);
}
curbp->b_point = pos(curbp, curbp->b_egap);
}
/*search for a string and replace it with another string */
void query_replace(void)
{
point_t o_point = curbp->b_point;
point_t l_point = -1;
point_t found;
char question[STRBUF_L];
int slen, rlen; /* length of search and replace strings */
int numsub = 0; /* number of substitutions */
int ask = TRUE;
int c;
searchtext[0] = '\0';
replace[0] = '\0';
if (!getinput("Query replace: ", (char*)searchtext, STRBUF_M))
return;
if (!getinput("With: ", (char*)replace, STRBUF_M))
return;
slen = strlen(searchtext);
rlen = strlen(replace);
/* build query replace question string */
sprintf(question, "Replace '%s' with '%s' ? ", searchtext, replace);
/* scan through the file, from point */
numsub = 0;
while(TRUE) {
found = search_forward(searchtext);
/* if not found set the point to the last point of replacement, or where we started */
if (found == -1) {
curbp->b_point = (l_point == -1 ? o_point : l_point);
break;
}
curbp->b_point = found;
/* search_forward places point at end of search, move to start of search */
curbp->b_point -= slen;
if (ask == TRUE) {
msg(question);
clrtoeol();
qprompt:
display(curwp, TRUE);
c = getch();
switch (c) {
case 'y': /* yes, substitute */
break;
case 'n': /* no, find next */
curbp->b_point = found; /* set to end of search string */
continue;
case '!': /* yes/stop asking, do the lot */
ask = FALSE;
break;
case 0x1B: /* esc */
flushinp(); /* discard any escape sequence without writing in buffer */
case 'q': /* controlled exit */
return;
default: /* help me */
msg("(y)es, (n)o, (!)do the rest, (q)uit");
goto qprompt;
}
}
if (rlen > slen) {
movegap(curbp, found);
/*check enough space in gap left */
if (rlen - slen < curbp->b_egap - curbp->b_gap)
growgap(curbp, rlen - slen);
/* shrink gap right by r - s */
curbp->b_gap = curbp->b_gap + (rlen - slen);
} else if (slen > rlen) {
movegap(curbp, found);
/* stretch gap left by s - r, no need to worry about space */
curbp->b_gap = curbp->b_gap - (slen - rlen);
} else {
/* if rlen = slen, we just overwrite the chars, no need to move gap */
}
/* now just overwrite the chars at point in the buffer */
l_point = curbp->b_point;
memcpy(ptr(curbp, curbp->b_point), replace, rlen * sizeof (char_t));
curbp->b_flags |= B_MODIFIED;
curbp->b_point = found - (slen - rlen); /* end of replcement */
numsub++;
}
msg("%d substitutions", numsub);
}
}
void backsp()
{
curbp->b_point = movegap(curbp, curbp->b_point);
undoset();
if (curbp->b_buf < curbp->b_gap) {
--curbp->b_gap;
curbp->b_flags |= B_MODIFIED;
}
curbp->b_point = pos(curbp, curbp->b_egap);
}
void delete()
{
curbp->b_point = movegap(curbp, curbp->b_point);
undoset();
if (curbp->b_egap < curbp->b_ebuf) {
curbp->b_point = pos(curbp, ++curbp->b_egap);
curbp->b_flags |= B_MODIFIED;
}
}
void gotoline()
{
temp[0] = '\0';
int line;
point_t p;
result = getinput(m_goto, (char*)temp, STRBUF_S);
if (temp[0] != '\0' && result) {