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vile-8.1
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api.c
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1998-07-01
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/*
* api.c -- (roughly) nvi's api to perl and tcl
*
* Status of this file: Some of the functions in this file are unused.
* Early on, I was trying for compatibility with nvi's perl interface.
* Now that I'm not, I've gotten lazy and have occassionally been skipping
* this layer.
*
* Some of the code in this file is still used and is, in fact, very
* important. There's other code which may simply be removed.
*
* OTOH, if someone ever does a TCL interface (it probably won't
* be me -- I really like Perl and would probably lack motivation to
* do a proper job of it), some of the as now unused stuff might come
* in handy.
* - kev 4/7/1998
*/
#include "estruct.h"
#include "edef.h"
#if OPT_PERL
#include "api.h"
extern REGION *haveregion;
WINDOW *curwp_visible;
static void propagate_dot(void);
/* Maybe this should go in line.c ? */
static int
linsert_chars(char *s, int len)
{
#if 0
int nlcount = 0;
while (len-- > 0) {
if (*s == '\n') {
lnewline();
nlcount++;
}
else
linsert(1, *s);
s++;
}
return nlcount;
#else
/* I wrote the code this way both for efficiency reasons and
so that the MARK denoting the end of the range wouldn't
be moved to one of the newly inserted lines.
*/
int nlcount = 0;
int nlatend = 0;
int nlsuppress = 0;
int mdnewline = b_val(curbp, MDNEWLINE);
if (len <= 0)
return 0;
if (DOT.l == buf_head(curbp)) {
if (!mdnewline) {
DOT.l = lback(DOT.l);
DOT.o = llength(DOT.l);
}
if (s[len-1] == '\n') {
if (len > 1)
nlsuppress = TRUE;
if (!mdnewline) {
make_local_b_val(curbp, MDNEWLINE);
set_b_val(curbp, MDNEWLINE, TRUE);
}
}
else {
if (mdnewline) {
make_local_b_val(curbp, MDNEWLINE);
set_b_val(curbp, MDNEWLINE, FALSE);
}
}
}
if (s[len-1] == '\n') {
if (!mdnewline
&& lforw(DOT.l) == buf_head(curbp)
&& DOT.o == llength(DOT.l))
{
nlsuppress = TRUE;
make_local_b_val(curbp, MDNEWLINE);
set_b_val(curbp, MDNEWLINE, TRUE);
}
if (!nlsuppress) {
/* We implicitly get a newline by inserting anything at
the head of a buffer (which includes the empty buffer
case). So if we actually insert a newline, we'll end
up getting two of them. (Which is something we don't
want unless MDNEWLINE is TRUE.) */
lnewline();
nlcount++;
DOT.l = lback(DOT.l); /* back up DOT to the newly */
DOT.o = llength(DOT.l); /* inserted line */
}
nlatend = 1;
len--;
}
while (len > 0) {
if (*s == '\n') {
lnewline();
nlcount++;
s++;
len--;
}
else {
int i;
/* Find next newline so we can do block insert; We
start at 1, because we know the first character
can't be a newline. */
for (i = 1; i < len && s[i] != '\n'; i++)
;
linsert(i, *s);
if (i > 1) {
memcpy(DOT.l->l_text + DOT.o - i + 1, s + 1, i - 1);
}
len -= i;
s += i;
}
}
if (nlatend) {
/* Advance DOT to where it's supposed to be */
DOT.l = lforw(DOT.l);
DOT.o = 0;
}
return nlcount;
#endif
}
/* Another candidate for line.c */
static int
lreplace(char *s, int len)
{
LINE *lp = DOT.l;
int i;
char *t;
WINDOW *wp;
copy_for_undo(lp);
DOT.o = 0;
if (len > lp->l_size) {
int nlen;
char *ntext;
#define roundlenup(n) ((n+NBLOCK-1) & ~(NBLOCK-1))
nlen = roundlenup(len);
ntext = castalloc(char, nlen);
if (ntext == 0)
return FALSE;
if (lp->l_text)
ltextfree(lp, curbp);
lp->l_text = ntext;
lp->l_size = nlen;
}
lp->l_used = len;
/* FIXME: Handle embedded newlines */
for (i=len-1, t=lp->l_text; i >=0; i--)
t[i] = s[i];
/* We'd normally need a call to chg_buff here, but I don't want
to pay the price.
BUT...
We do call chg_buff before returning to vile. See
api_command_cleanup below.
*/
for_each_window(wp) {
if (wp->w_dot.l == lp && wp->w_dot.o > len)
wp->w_dot.o = len;
if (wp->w_lastdot.l == lp && wp->w_lastdot.o > len)
wp->w_lastdot.o = len;
}
do_mark_iterate(mp,
if (mp->l == lp && mp->o > len)
mp->o = len;
);
return TRUE;
}
void
api_setup_fake_win(VileBuf *vbp, int do_delete)
{
if (curwp_visible == 0)
curwp_visible = curwp;
if (vbp->fwp) {
curwp = vbp->fwp;
}
else {
(void) push_fake_win(vbp->bp);
vbp->fwp = curwp;
vbp->changed = 0;
}
/* Should we call make_current() for this? */
curbp = curwp->w_bufp;
if (vbp->ndel > 0 && do_delete) {
int status;
/* Do lazy delete; FALSE means don't put text in kill buffer */
status = ldelete(vbp->ndel, FALSE);
vbp->ndel = 0;
if ( status == FALSE
|| (lforw(DOT.l) == buf_head(curbp) && DOT.o >= llength(DOT.l))) {
make_local_b_val(curbp, MDNEWLINE);
set_b_val(curbp, MDNEWLINE, FALSE);
}
}
}
/* I considered three possible solutions for preventing stale
regions from being used. Here they are:
1) Validate the region in question. I.e, make sure that
the region start and end lines are still in the buffer.
Set the region to reasonable defaults if not.
The problem with this approach is that we need something
else to hold the end marker of the region while we're
working on it. One possible solution is to use the
per-buffer w_lastdot field. But I'm not entirely sure
this is safe.
2) Make the region and attributed region and put it on
the attribute list. The marks representing the
ends of the region will certainly be updated correctly
if this is done. The downside is that we'd have to
beef up the code which deals with attributes to allow
external pointers to the attributes. It wouldn't
do for one of the attribute lists to be freed up with
one of our VileBuf structures still pointer to one of the
structures.
3) Make line.c and undo.c aware of the VileBuf regions.
This solution has no serious downside aside from
further bulking up the files in question.
I chose option 3 since I was able to bury the work
inside do_mark_iterate (see estruct.h). The following
function (api_mark_iterator) is the helper function
found in do_mark_iterate.
*/
MARK *
api_mark_iterator(BUFFER *bp, int *iterp)
{
MARK *mp = NULL;
VileBuf *vbp = bp2vbp(bp);
if (vbp != NULL) {
switch (*iterp) {
case 0:
mp = &vbp->region.r_orig;
break;
case 1:
mp = &vbp->region.r_end;
break;
default:
break;
}
(*iterp)++;
}
return mp;
}
/*
* This is a variant of gotoline in basic.c. It differs in that
* it attempts to use the line number information to more efficiently
* find the line in question. It will also position DOT at the beginning
* of the line.
*
*/
int
api_gotoline(VileBuf *vbp, int lno)
{
#if !SMALLER
int count;
LINE *lp;
BUFFER *bp = vbp->bp;
if (!b_is_counted(bp))
bsizes(bp);
count = lno - DOT.l->l_number;
lp = DOT.l;
while (count < 0 && lp != buf_head(bp)) {
lp = lback(lp);
count++;
}
while (count > 0) {
lp = lforw(lp);
count--;
if (lp == buf_head(bp))
break;
}
DOT.o = 0;
if (lp != buf_head(bp) && lno == lp->l_number) {
DOT.l = lp;
return TRUE;
}
else {
DOT.l = buf_head(bp);
return FALSE;
}
#else
return gotoline(TRUE, lno);
#endif
}
int
api_aline(VileBuf *vbp, int lno, char *line, int len)
{
api_setup_fake_win(vbp, TRUE);
if (lno >= 0 && lno < line_count(vbp->bp)) {
api_gotoline(vbp, lno+1);
linsert_chars(line, len);
lnewline();
}
else { /* append to the end */
gotoline(FALSE, 0);
gotoeol(FALSE, 0);
lnewline();
linsert_chars(line, len);
}
return TRUE;
}
int
api_dotinsert(VileBuf *vbp, char *text, int len) {
/* Set up the fake window; but we'll do any pending deletes
ourselves. */
api_setup_fake_win(vbp, FALSE);
/* FIXME: Check to see if the buffer needs to be modified at all.
We'll save our undo space better this way. We'll also be able
to better preserve the user's marks. */
linsert_chars(text, len);
if (vbp->ndel) {
int status;
status = ldelete(vbp->ndel, FALSE);
vbp->ndel = 0;
if (status == FALSE
|| (lforw(DOT.l) == buf_head(curbp) && DOT.o >= llength(DOT.l))) {
make_local_b_val(curbp, MDNEWLINE);
set_b_val(curbp, MDNEWLINE, FALSE);
}
}
return TRUE;
}
int
api_dline(VileBuf *vbp, int lno)
{
int status = TRUE;
api_setup_fake_win(vbp, TRUE);
if (lno > 0 && lno <= line_count(vbp->bp)) {
api_gotoline(vbp, lno);
gotobol(TRUE,TRUE);
status = ldelete(llength(DOT.l) + 1, FALSE);
}
else
status = FALSE;
return status;
}
int
api_gline(VileBuf *vbp, int lno, char **linep, int *lenp)
{
int status = TRUE;
api_setup_fake_win(vbp, TRUE);
if (lno > 0 && lno <= line_count(vbp->bp)) {
api_gotoline(vbp, lno);
*linep = DOT.l->l_text;
*lenp = llength(DOT.l);
if (*lenp == 0) {
*linep = ""; /* Make sure we pass back a zero length,
null terminated value when the length
is zero. Otherwise perl gets confused.
(It thinks it should calculate the length
when given a zero length.)
*/
}
}
else
status = FALSE;
return status;
}
#if 0 /* Not used. */
int
api_dotgline(VileBuf *vbp, char **linep, int *lenp, int *neednewline)
{
api_setup_fake_win(vbp, TRUE);
if (!vbp->dot_inited) {
DOT = vbp->region.r_orig; /* set DOT to beginning of region */
vbp->dot_inited = 1;
}
/* FIXME: Handle rectangular regions. */
if ( is_header_line(DOT, curbp)
|| ( DOT.l == vbp->region.r_end.l
&& ( vbp->regionshape == FULLLINE
|| ( vbp->regionshape == EXACT
&& DOT.o >= vbp->region.r_end.o))))
{
return FALSE;
}
*linep = DOT.l->l_text + DOT.o;
*lenp = llength(DOT.l) - DOT.o;
if (vbp->regionshape == EXACT && DOT.l == vbp->region.r_end.l) {
*lenp -= llength(DOT.l) - vbp->region.r_end.o;
}
if (*lenp < 0)
*lenp = 0; /* Make sure return length is non-negative */
if (*lenp == 0) {
*linep = ""; /* Make sure we pass back a zero length,
null terminated value when the length
is zero. Otherwise perl gets confused.
(It thinks it should calculate the length
when given a zero length.)
*/
}
if (vbp->inplace_edit) {
if (vbp->regionshape == EXACT && DOT.l == vbp->region.r_end.l) {
vbp->ndel = *lenp;
*neednewline = 0;
}
else {
vbp->ndel = *lenp + 1;
*neednewline = 1;
}
}
else {
if (vbp->regionshape == EXACT && DOT.l == vbp->region.r_end.l) {
DOT.o += *lenp;
*neednewline = 0;
}
else {
DOT.l = lforw(DOT.l);
DOT.o = 0;
*neednewline = 1;
}
}
return TRUE;
}
#endif /* Not used */
int
api_sline(VileBuf *vbp, int lno, char *line, int len)
{
int status = TRUE;
api_setup_fake_win(vbp, TRUE);
if (lno > 0 && lno <= line_count(vbp->bp)) {
api_gotoline(vbp, lno);
if ( DOT.l->l_text != line
&& ( llength(DOT.l) != len
|| memcmp(line, DOT.l->l_text, len) != 0)) {
lreplace(line, len);
vbp->changed = 1;
}
}
else
status = FALSE;
return status;
}
int
api_iline(VileBuf *vbp, int lno, char *line, int len)
{
return api_aline(vbp, lno-1, line, len);
}
int
api_lline(VileBuf *vbp, int *lnop)
{
*lnop = line_count(vbp->bp);
return TRUE;
}
VileBuf *
api_fscreen(char *name)
{
BUFFER *bp;
bp = find_b_file(name);
if (bp)
return api_bp2vbp(bp);
else
return 0;
}
int
api_delregion(VileBuf *vbp)
{
api_setup_fake_win(vbp, TRUE);
haveregion = NULL;
DOT = vbp->region.r_orig;
MK = vbp->region.r_end;
regionshape = vbp->regionshape;
if (vbp->regionshape == FULLLINE) {
MK.l = lback(MK.l);
}
return killregion();
}
int
api_motion(VileBuf *vbp, char *mstr)
{
const CMDFUNC *cfp;
char *mp;
int c, f, n, s;
int status;
int saved_clexec, saved_disinp, saved_discmd, saved_isnamedcmd;
if (mstr == NULL)
return FALSE;
status = TRUE;
saved_clexec = clexec;
saved_discmd = discmd;
saved_disinp = disinp;
saved_isnamedcmd = isnamedcmd;
clexec = FALSE; /* Not executing a command line */
discmd = FALSE; /* Don't display commands / arg counts */
disinp = FALSE; /* Don't display input */
isnamedcmd = FALSE; /* Not a named command */
api_setup_fake_win(vbp, TRUE);
mp = mstr + strlen(mstr);
mapungetc(abortc | NOREMAP);
/* Should we allow remapping? Seems to me like it introduces too
many variables. */
while (mp-- > mstr) {
mapungetc(*mp | NOREMAP);
}
while (mapped_ungotc_avail()) {
/* Get the character */
c = kbd_seq();
if (ABORTED(c)) {
if (mapped_ungotc_avail()) {
/* Not our abortc */
while (mapped_ungotc_avail())
(void) kbd_seq();
status = FALSE;
break;
}
else
break; /* okay, it's ours */
}
f = FALSE;
n = 1;
do_repeats(&c,&f,&n);
/* and execute the command */
cfp = kcod2fnc(c);
if ( (cfp != NULL) && ((cfp->c_flags & MOTION) != 0))
s = execute(cfp, f, n);
else {
while (mapped_ungotc_avail())
(void) kbd_seq();
status = FALSE;
break;
}
}
clexec = saved_clexec;
discmd = saved_discmd;
disinp = saved_disinp;
isnamedcmd = saved_isnamedcmd;
return status;
}
int
api_edit(char *fname, VileBuf **retvbpp)
{
BUFFER *bp;
if (fname == NULL) {
char bufname[NBUFN];
static int unnamed_cnt = 0;
sprintf(bufname, "[unnamed-%d]", ++unnamed_cnt);
bp = bfind(bufname, 0);
bp->b_active = TRUE;
}
else {
bp = getfile2bp(fname, FALSE, FALSE);
if (bp == 0) {
*retvbpp = 0;
return 1;
}
}
*retvbpp = api_bp2vbp(bp);
api_setup_fake_win(*retvbpp, TRUE);
return !swbuffer_lfl(bp, FALSE);
}
int
api_swscreen(VileBuf *oldsp, VileBuf *newsp)
{
/*
* Calling api_command_cleanup nukes various state, like DOT
* Now if DOT got propogated, all is (likely) well. But if it didn't,
* then DOT will likely be in the wrong place if the executing perl
* script expects to access a buffer on either side of a switchscreen
* call.
*
* I see two different solutions for this. 1) Maintain a copy of
* dot in the VileBuf structure. 2) Don't destroy the fake windows by
* popping them off. Which means that we either teach the rest
* of vile about fake windows (scary) or we temporarily unlink the
* fake windows from the buffer list.
*
* I'm in favor of temporarily unlinking the fake windows from
* the buffer list. The only problem with this is that the unlinked
* window's version of DOT is not iterated over in do_mark_iterate.
* (Probably won't be a problem that often, but we need to account
* for it.)
*
* So... I guess we could maintain a separate structure which
* has the unlinked window pointers. And then api_mark_iterate
* could walk these. (Yuck.)
*
* Anyhow, there's a lot of issues here requiring careful
* consideration. Which is why I haven't already done it.
* - kev 4/3/1998
*
* Okay, I put in the stuff for detaching and reattaching fake
* windows, but the above noted caveats still apply.
* - kev 4/18/1998
*
* I decided that the fake window stuff was too much of a hack
* So I blew it away. The rest of vile has limited knowledge
* of fake windows now where it needs it. This knowledge is
* buried in the macro "for_each_visible_window".
* - kev 4/20/1998
*/
curwp = curwp_visible ? curwp_visible : curwp;
curbp = curwp->w_bufp;
if (oldsp)
swbuffer(vbp2bp(oldsp));
swbuffer(vbp2bp(newsp));
curwp_visible = curwp;
return TRUE;
}
/* Causes the screen(s) to be updated */
void
api_update(void)
{
propagate_dot();
curwp = curwp_visible ? curwp_visible : curwp;
curbp = curwp->w_bufp;
update(TRUE);
curwp_visible = curwp;
}
/*
* The following are not in the nvi API. But I needed them in order to
* do an efficient implementation for vile.
*/
/* Propagate DOT for the fake windows that need it;
Also do any outstanding (deferred) deletes. */
static void
propagate_dot(void)
{
WINDOW *wp;
for_each_window(wp) {
if (!is_fake_window(wp)) {
/* We happen to know that the fake windows will always
be first in the buffer list. So we exit the loop
when we hit one that isn't fake. */
break;
}
/* Do outstanding delete (if any) */
api_setup_fake_win(bp2vbp(wp->w_bufp), TRUE);
if (bp2vbp(wp->w_bufp)->dot_changed) {
if (curwp_visible && curwp_visible->w_bufp == wp->w_bufp) {
curwp_visible->w_dot = wp->w_dot;
curwp_visible->w_flag |= WFHARD;
}
else {
int found = 0;
WINDOW *pwp;
for_each_window(pwp) {
if (wp->w_bufp == pwp->w_bufp
&& !is_fake_window(pwp))
{
found = 1;
pwp->w_dot = wp->w_dot;
pwp->w_flag |= WFHARD;
break; /* out of inner for_each_window */
}
}
if (!found) {
/* No window to propagate DOT in, so just use the
buffer's traits */
wp->w_bufp->b_dot = wp->w_dot;
}
}
}
}
}
void
api_command_cleanup(void)
{
BUFFER *bp;
if (curwp_visible == 0)
curwp_visible = curwp;
/* Propgate dot to the visible windows and do any deferred deletes */
propagate_dot();
/* Pop the fake windows */
while ((bp = pop_fake_win(curwp_visible)) != NULL) {
if (bp2vbp(bp) != NULL)
bp2vbp(bp)->fwp = 0;
bp2vbp(bp)->dot_inited = 0; /* for next time */
bp2vbp(bp)->dot_changed = 0; /* ditto */
if (bp2vbp(bp)->changed) {
chg_buff(bp, WFHARD);
bp2vbp(bp)->changed = 0;
}
}
curwp_visible = 0;
if (curbp != curwp->w_bufp)
make_current(curwp->w_bufp);
MK = DOT; /* make sure MK is in same buffer as DOT */
}
void
api_free_private(void *vsp)
{
VileBuf *vbp = (VileBuf *) vsp;
if (vbp) {
vbp->bp->b_api_private = 0;
#if OPT_PERL
perl_free_handle(vbp->perl_handle);
#endif
free(vbp);
}
}
/* Given a buffer pointer, returns a pointer to a VileBuf structure,
* creating it if necessary.
*/
VileBuf *
api_bp2vbp(BUFFER *bp)
{
VileBuf *vbp;
vbp = bp2vbp(bp);
if (vbp == 0) {
vbp = typecalloc(VileBuf);
if (vbp != 0) {
bp->b_api_private = vbp;
vbp->bp = bp;
vbp->regionshape = FULLLINE;
vbp->region.r_orig.l =
vbp->region.r_end.l = buf_head(bp);
vbp->region.r_orig.o =
vbp->region.r_end.o = 0;
vbp->dot_inited = 0;
vbp->dot_changed = 0;
vbp->ndel = 0;
}
}
return vbp;
}
#endif