Category : Word Processors
Archive   : STEVIE.ZIP
Filename : MISCCMDS.C

/*
* STevie - ST editor for VI enthusiasts. ...Tim Thompson...twitch!tjt...
*
* Extensive modifications by: Tony Andrews onecom!wldrdg!tony
*
*/

#include "stevie.h"

static void openfwd(), openbwd();

extern int did_ai;

/*
* opencmd
*
* Add a blank line above or below the current line.
*/

void
opencmd(dir, can_ai)
int dir;
int can_ai; /* if true, consider auto-indent */
{
if (dir == FORWARD)
openfwd(can_ai);
else
openbwd(can_ai);
}

static void
openfwd(can_ai)
int can_ai;
{
LINE *l;
LPTR *next;
char *s; /* string to be moved to new line, if any */

/*
* If we're in insert mode, we need to move the remainder of the
* current line onto the new line. Otherwise the new line is left
* blank.
*/
if (State == INSERT)
s = &Curschar->linep->s[Curschar->index];
else
s = "";

if ((next = nextline(Curschar)) == NULL) /* open on last line */
next = Fileend;

/*
* By asking for as much space as the prior line had we make sure
* that we'll have enough space for any auto-indenting.
*/
if ((l = newline(strlen(Curschar->linep->s) + SLOP)) == NULL)
return;

if (*s != NUL)
strcpy(l->s, s); /* copy string to new line */
#if 0
else if (can_ai && P(P_AI)) {
/*
* Auto-indent removed due to buggy implementation...
*/
did_ai = TRUE;
}
#endif

if (State == INSERT) /* truncate current line at cursor */
*s = NUL;


Curschar->linep->next = l; /* link neighbors to new line */
next->linep->prev = l;

l->prev = Curschar->linep; /* link new line to neighbors */
l->next = next->linep;

if (next == Fileend) /* new line at end */
l->num = Curschar->linep->num + LINEINC;

else if ((l->prev->num) + 1 == l->next->num) /* no gap, renumber */
renum();

else { /* stick it in the middle */
unsigned long lnum;
lnum = ((long)l->prev->num + (long)l->next->num) / 2;
l->num = lnum;
}

*Curschar = *nextline(Curschar); /* cursor moves down */
Curschar->index = 0;

s_ins(Cursrow+1, 1); /* insert a physical line */

updatescreen(); /* because Botchar is now invalid... */

cursupdate(); /* update Cursrow before insert */
}

static void
openbwd(can_ai)
int can_ai;
{
LINE *l;
LPTR *prev;

prev = prevline(Curschar);

if ((l = newline(strlen(Curschar->linep->s) + SLOP)) == NULL)
return;

Curschar->linep->prev = l; /* link neighbors to new line */
if (prev != NULL)
prev->linep->next = l;

l->next = Curschar->linep; /* link new line to neighbors */
if (prev != NULL)
l->prev = prev->linep;

#if 0
if (can_ai && P(P_AI)) {
did_ai = TRUE;
}
#endif

*Curschar = *prevline(Curschar); /* cursor moves up */
Curschar->index = 0;

if (prev == NULL) /* new start of file */
Filemem->linep = l;

renum(); /* keep it simple - we don't do this often */

cursupdate(); /* update Cursrow before insert */
if (Cursrow != 0)
s_ins(Cursrow, 1); /* insert a physical line */

updatescreen();
}

int
cntllines(pbegin,pend)
LPTR *pbegin, *pend;
{
LINE *lp;
int lnum = 1;

for (lp = pbegin->linep; lp != pend->linep ;lp = lp->next)
lnum++;

return(lnum);
}

/*
* plines(p) - return the number of physical screen lines taken by line 'p'
*/
int
plines(p)
LPTR *p;
{
register int col;
register char *s;

s = p->linep->s;

if (*s == NUL) /* empty line */
return 1;

/*
* If list mode is on, then the '$' at the end of
* the line takes up one extra column.
*/
col = P(P_LS) ? 1 : 0;

for (; *s != NUL ;s++) {
if ( *s == TAB && !P(P_LS))
col += P(P_TS) - (col % P(P_TS));
else
col += chars[(unsigned)(*s & 0xff)].ch_size;
}
return ((col + (Columns-1)) / Columns);
}

void
fileinfo()
{
long l1, l2;
char buf[80];

if (bufempty()) {
msg("Buffer Empty");
return;
}

l1 = cntllines(Filemem, Curschar);
l2 = cntllines(Filemem, Fileend) - 1;
sprintf(buf, "\"%s\"%s line %ld of %ld -- %ld %% --",
(Filename != NULL) ? Filename : "No File",
Changed ? " [Modified]" : "",
l1, l2, (l1 * 100)/l2);
msg(buf);
}

/*
* gotoline(n) - return a pointer to line 'n'
*
* Returns a pointer to the last line of the file if n is zero, or
* beyond the end of the file.
*/
LPTR *
gotoline(n)
int n;
{
static LPTR l;

l.index = 0;

if ( n == 0 )
l = *prevline(Fileend);
else {
LPTR *p;

for (l = *Filemem; --n > 0 ;l = *p)
if ((p = nextline(&l)) == NULL)
break;
}
return &l;
}

void
inschar(c)
int c;
{
register char *p, *pend;

/* make room for the new char. */
if ( ! canincrease(1) )
return;

p = &Curschar->linep->s[strlen(Curschar->linep->s) + 1];
pend = &Curschar->linep->s[Curschar->index];

for (; p > pend ;p--)
*p = *(p-1);

*p = c;

/*
* If we're in insert mode and showmatch mode is set, then
* check for right parens and braces. If there isn't a match,
* then beep. If there is a match AND it's on the screen, then
* flash to it briefly. If it isn't on the screen, don't do anything.
*/
if (P(P_SM) && State == INSERT && (c == ')' || c == '}' || c == ']')) {
LPTR *lpos, csave;

if ((lpos = showmatch()) == NULL) /* no match, so beep */
beep();
else if (LINEOF(lpos) >= LINEOF(Topchar)) {
updatescreen(); /* show the new char first */
csave = *Curschar;
*Curschar = *lpos; /* move to matching char */
cursupdate();
windgoto(Cursrow, Curscol);
delay(); /* brief pause */
*Curschar = csave; /* restore cursor position */
cursupdate();
}
}

inc(Curschar);
CHANGED;
}

void
insstr(s)
register char *s;
{
register char *p, *endp;
register int k, n = strlen(s);

/* Move everything in the file over to make */
/* room for the new string. */
if (!canincrease(n))
return;

endp = &Curschar->linep->s[Curschar->index];
p = Curschar->linep->s + strlen(Curschar->linep->s) + 1 + n;

for (; p>endp ;p--)
*p = *(p-n);

p = &Curschar->linep->s[Curschar->index];
for ( k=0; k *p++ = *s++;
inc(Curschar);
}
CHANGED;
}

bool_t
delchar(fixpos)
bool_t fixpos; /* if TRUE, fix the cursor position when done */
{
register int i;

/* Check for degenerate case; there's nothing in the file. */
if (bufempty())
return FALSE;

if (lineempty()) /* can't do anything */
return FALSE;

/* Delete the char. at Curschar by shifting everything */
/* in the line down. */
for ( i=Curschar->index+1; i < Curschar->linep->size ;i++)
Curschar->linep->s[i-1] = Curschar->linep->s[i];

/* If we just took off the last character of a non-blank line, */
/* we don't want to end up positioned at the newline. */
if (fixpos) {
if (gchar(Curschar)==NUL && Curschar->index>0 && State!=INSERT)
Curschar->index--;
}
CHANGED;

return TRUE;
}


void
delline(nlines)
{
register LINE *p, *q;
int doscreen = TRUE; /* if true, update the screen */

/*
* There's no point in keeping the screen updated if we're
* deleting more than a screen's worth of lines.
*/
if (nlines > (Rows - 1)) {
doscreen = FALSE;
s_del(Cursrow, Rows-1); /* flaky way to clear rest of screen */
}

while ( nlines-- > 0 ) {

if (bufempty()) /* nothing to delete */
break;

if (buf1line()) { /* just clear the line */
Curschar->linep->s[0] = NUL;
Curschar->index = 0;
break;
}

p = Curschar->linep->prev;
q = Curschar->linep->next;

if (p == NULL) { /* first line of file so... */
Filemem->linep = q; /* adjust start of file */
Topchar->linep = q; /* and screen */
} else
p->next = q;
q->prev = p;

clrmark(Curschar->linep); /* clear marks for the line */

/*
* Delete the correct number of physical lines on the screen
*/
if (doscreen)
s_del(Cursrow, plines(Curschar));

/*
* If deleting the top line on the screen, adjust Topchar
*/
if (Topchar->linep == Curschar->linep)
Topchar->linep = q;

free(Curschar->linep->s);
free(Curschar->linep);

Curschar->linep = q;
Curschar->index = 0; /* is this right? */
CHANGED;

/* If we delete the last line in the file, back up */
if ( Curschar->linep == Fileend->linep) {
Curschar->linep = Curschar->linep->prev;
/* and don't try to delete any more lines */
break;
}
}
}