ref: db8bfd2f8fd0dda83b71af2052dbe8b6d27c6c28
dir: /cmd.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include "dat.h"
#include "fns.h"
Dot dot;
usize totalsz;
int treadsoftly;
// FIXME: undo/redo as an unbatched series of inserts and deletes
// FIXME: crazy idea, multisnarf with addressable elements; $n registers; fork pplay to display them → ?
enum{
OPins,
OPdel,
OPcrop,
Nops = 128,
};
static int epfd[2];
typedef struct Op Op;
struct Op{
int type;
usize from;
usize to;
Chunk *c;
};
static int ohead, otail;
static Chunk *hold;
static Op ops[Nops];
void
setrange(usize from, usize to)
{
assert((from & 3) == 0);
assert((to & 3) == 0);
dot.from = from;
dot.to = to;
if(dot.pos < from || dot.pos >= to)
dot.pos = from;
dot.at = -1ULL;
}
int
jump(usize off)
{
if(off < dot.from || off > dot.to){
werrstr("cannot jump outside of loop bounds\n");
return -1;
}
dot.pos = off;
if(dot.from == 0 && dot.to == totalsz)
dot.at = off;
return 0;
}
// FIXME: needs a different way of managing ops
int
unpop(char *)
{
return 0;
}
int
popop(char *) // FIXME: u[n]
{
Op *op;
if(otail == ohead)
return 0;
ohead = ohead - 1 & nelem(ops) - 1;
op = ops + ohead;
dprint(op->c, "cmd/pop dot=%Δ type=%d from=%08zux to=%08zux c=%#p\n",
&dot, op->type, op->from, op->to, op->c);
switch(op->type){
case OPdel:
if(insertat(op->from, op->c) == nil)
return -1;
break;
case OPins:
if(cutrange(op->from, op->to, nil) == nil)
return -1;
break;
case OPcrop:
if(insertat(op->to - op->from, op->c) == nil)
return -1;
dprint(nil, "uncropped with loose root\n");
fixroot(op->c, op->from + (op->to - op->from));
break;
default: werrstr("phase error: unknown op %d\n", op->type); return -1;
}
memset(ops+ohead, 0, sizeof *ops);
return 1;
}
void
pushop(int type, usize from, usize to, Chunk *c)
{
freechain(ops[ohead].c);
ops[ohead] = (Op){type, from, to, c};
ohead = ohead + 1 & nelem(ops) - 1;
}
static int
replace(char *, Chunk *c)
{
Chunk *left, *latch;
if(c == nil){
fprint(2, "replace: nothing to paste\n");
return -1;
}
if((left = inserton(dot.from, dot.to, c, &latch)) == nil){
fprint(2, "insert: %r\n");
return -1;
}
pushop(OPdel, dot.from, dot.to, latch);
pushop(OPins, dot.from, dot.to, nil);
setdot(&dot, nil);
dot.pos = c2p(left->right);
return 1;
}
static int
insert(char *, Chunk *c)
{
Chunk *left;
if(c == nil){
fprint(2, "insert: nothing to paste\n");
return -1;
}
if(dot.at == -1ULL){
fprint(2, "insert: nowhere to paste\n");
return -1;
}
assert(dot.at <= dot.to);
dprint(nil, "cmd/insert %Δ\n", &dot);
dprint(c, "buffered\n");
pushop(OPins, dot.at, dot.at+chunklen(c)-1, nil);
if((left = insertat(dot.at, c)) == nil){
fprint(2, "insert: %r\n");
return -1;
}
setdot(&dot, nil);
dot.pos = c2p(left->right);
dot.at = -1ULL;
dprint(nil, "end\n");
return 1;
}
static int
paste(char *s, Chunk *c)
{
if(c == nil && (c = hold) == nil){
werrstr("paste: no buffer");
return -1;
}
c = clone(c, c->left);
if(dot.from > 0 || dot.to < totalsz)
return replace(s, c);
else
return insert(s, c);
}
static void
snarf(Chunk *c)
{
dprint(hold, "snarf was:\n");
freechain(hold);
hold = c;
dprint(hold, "snarf now:\n");
}
static int
copy(char *)
{
Chunk *left, *right;
if(dot.from == 0 && dot.to == totalsz){
werrstr("copy: no range selected");
return -1;
}
dprint(hold, "cmd/copy %Δ\n", &dot);
splitrange(dot.from, dot.to, &left, &right);
snarf(clone(left, right));
return 0;
}
static vlong
cut(char *)
{
Chunk *latch;
if(dot.from == 0 && dot.to == totalsz){
werrstr("cut: no range selected");
return -1;
}
dprint(nil, "cmd/cut %Δ\n", &dot);
cutrange(dot.from, dot.to, &latch);
dprint(latch, "latched\n");
snarf(clone(latch, latch->left));
pushop(OPdel, dot.from, dot.from+chunklen(latch)-1, latch);
setdot(&dot, nil);
return 1;
}
static int
crop(char *)
{
Chunk *latch;
dprint(nil, "cmd/crop %Δ\n", &dot);
if(croprange(dot.from, dot.to, &latch) == nil)
return -1;
dprint(latch, "latched\n");
pushop(OPcrop, dot.from, dot.to, latch);
setdot(&dot, nil);
dot.pos = 0;
return 1;
}
vlong
getbuf(Dot d, usize n, uchar *buf, usize bufsz)
{
uchar *p, *b;
usize sz;
assert(d.pos < totalsz);
assert(n <= bufsz);
b = buf;
while(n > 0){
if((p = getslice(&d, n, &sz)) == nil || sz < Sampsz)
return -1;
memcpy(b, p, sz);
b += sz;
n -= sz;
}
return b - buf;
}
static int
writebuf(int fd)
{
static uchar *buf;
static usize bufsz;
int nio;
usize n, m, c, k;
Dot d;
d.pos = d.from = dot.from;
d.to = dot.to;
if((nio = iounit(fd)) == 0)
nio = 8192;
if(bufsz < nio){
buf = erealloc(buf, nio, bufsz);
bufsz = nio;
}
for(m=d.to-d.from, c=0; m>0;){
k = nio < m ? nio : m;
if(getbuf(d, k, buf, bufsz) < 0){
fprint(2, "writebuf: couldn\'t snarf: %r\n");
return -1;
}
if((n = write(fd, buf, k)) != k){
fprint(2, "writebuf: short write not %zd: %r\n", k);
return -1;
}
m -= n;
d.pos += n;
c += n;
}
write(fd, buf, 0); /* close pipe */
return 0;
}
int
advance(Dot *d, usize n)
{
usize m, sz;
m = 0;
while(n > 0){
if(getslice(d, n, &sz) == nil)
return -1;
m += sz;
n -= sz;
}
return m;
}
static void
rc(void *s)
{
close(epfd[1]);
dup(epfd[0], 0);
dup(epfd[0], 1);
close(epfd[0]);
procexecl(nil, "/bin/rc", "rc", "-c", s, nil);
sysfatal("procexec: %r");
}
static void
wproc(void *efd)
{
int fd;
fd = (intptr)efd;
writebuf(fd);
close(fd);
threadexits(nil);
}
/* using a thread does slow down reads a bit */
// FIXME: ugly
static void
rthread(void *efd)
{
int fd;
Dot d;
Chunk *c;
d = dot;
treadsoftly = 1;
fd = (intptr)efd;
if((c = readintochunks(fd)) == nil){
treadsoftly = 0;
threadexits("failed reading from pipe: %r");
}
close(fd);
dot = d;
pushop(OPins, dot.from, dot.from+chunklen(c)-1, nil);
paste(nil, c);
dot.pos = dot.from;
setdot(&dot, nil);
recalcsize();
redraw(0);
treadsoftly = 0;
threadexits(nil);
}
static int
pipeline(char *arg, int rr, int wr)
{
if(pipe(epfd) < 0)
sysfatal("pipe: %r");
if(procrfork(rc, arg, mainstacksize, RFFDG|RFNOTEG|RFNAMEG) < 0)
sysfatal("procrfork: %r");
close(epfd[0]);
if(wr && procrfork(wproc, (int*)dup(epfd[1], -1), mainstacksize, RFFDG) < 0){
fprint(2, "procrfork: %r\n");
return -1;
}
if(rr && threadcreate(rthread, (int*)dup(epfd[1], -1), mainstacksize) < 0){
fprint(2, "threadcreate: %r\n");
return -1;
}
close(epfd[1]);
return 0;
}
static int
pipeto(char *arg)
{
return pipeline(arg, 0, 1);
}
static int
pipefrom(char *arg)
{
return pipeline(arg, 1, 0);
}
static int
pipethrough(char *arg)
{
return pipeline(arg, 1, 1);
}
static int
replicate(char *)
{
static char u[256];
snprint(u, sizeof u, "<[3=0] window -m %s /fd/3", argv0);
return pipeto(u);
}
static int
readfrom(char *s)
{
int fd;
if((fd = open(s, OREAD)) < 0)
return -1;
if(threadcreate(rthread, (int*)fd, mainstacksize) < 0){
fprint(2, "threadcreate: %r\n");
return -1;
}
return 0;
}
/* the entire string is treated as the filename, ie.
* spaces and any other weird characters will be part
* of it */
static int
writeto(char *arg)
{
int fd;
if((fd = create(arg, OWRITE, 0664)) < 0){
werrstr("writeto: %r");
return -1;
}
if(procrfork(wproc, (int*)fd, mainstacksize, RFFDG) < 0){
fprint(2, "procrfork: %r\n");
return -1;
}
close(fd);
return 0;
}
int
cmd(char *s)
{
int n, x;
Rune r, r´;
/* FIXME: avoid potential conflicts with keys in main() */
assert(s != nil);
s += chartorune(&r, s);
for(;;){
n = chartorune(&r´, s);
if(r´ == Runeerror){
werrstr("malformed input");
return -1;
}
if(r´ == 0 || r´ != ' ' && r´ != '\t')
break;
s += n;
}
if(debug)
paranoia(1);
switch(r){
case '<': x = pipefrom(s); break;
case '^': x = pipethrough(s); break;
case '|': x = pipeto(s); break;
case 'c': x = copy(s); break;
case 'd': x = cut(s); break;
case 'p': x = paste(s, nil); break;
case 'q': threadexitsall(nil);
case 'r': x = readfrom(s); break;
case 's': x = replicate(s); break;
// case 'U': x = unpop(s); break;
case 'u': x = popop(s); break;
case 'w': x = writeto(s); break;
case 'x': x = crop(s); break;
default: werrstr("unknown command %C", r); x = -1; break;
}
if(debug)
paranoia(0);
recalcsize();
return x;
}
int
loadin(int fd)
{
Chunk *c;
if((c = readintochunks(fd)) == nil)
sysfatal("loadin: %r");
graphfrom(c);
return 0;
}
static void
catch(void *, char *msg)
{
if(strstr(msg, "closed pipe"))
noted(NCONT);
noted(NDFLT);
}
void
initcmd(void)
{
notify(catch);
}