plan9port/src/cmd/acme/look.c
Russ Cox 67dbeee5fe acme: check file content before declaring file "modified since last read"
Bad remote file systems can change mtime unexpectedly,
and then there is the problem that git rebase and similar
operations like to change the files and then change them back,
modifying the mtimes but not the content.

Avoid spurious Put errors on both of those by checking file
content.

(False positive "modified since last read" make the real ones
difficult to notice.)
2017-10-10 13:51:24 -04:00

842 lines
17 KiB
C

#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <cursor.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <fcall.h>
#include <regexp.h>
#include <9pclient.h>
#include <plumb.h>
#include <libsec.h>
#include "dat.h"
#include "fns.h"
CFid *plumbsendfid;
CFid *plumbeditfid;
Window* openfile(Text*, Expand*);
int nuntitled;
void
plumbthread(void *v)
{
CFid *fid;
Plumbmsg *m;
Timer *t;
USED(v);
threadsetname("plumbproc");
/*
* Loop so that if plumber is restarted, acme need not be.
*/
for(;;){
/*
* Connect to plumber.
*/
plumbunmount();
while((fid = plumbopenfid("edit", OREAD|OCEXEC)) == nil){
t = timerstart(2000);
recv(t->c, nil);
timerstop(t);
}
plumbeditfid = fid;
plumbsendfid = plumbopenfid("send", OWRITE|OCEXEC);
/*
* Relay messages.
*/
for(;;){
m = plumbrecvfid(plumbeditfid);
if(m == nil)
break;
sendp(cplumb, m);
}
/*
* Lost connection.
*/
fid = plumbsendfid;
plumbsendfid = nil;
fsclose(fid);
fid = plumbeditfid;
plumbeditfid = nil;
fsclose(fid);
}
}
void
startplumbing(void)
{
cplumb = chancreate(sizeof(Plumbmsg*), 0);
chansetname(cplumb, "cplumb");
threadcreate(plumbthread, nil, STACK);
}
void
look3(Text *t, uint q0, uint q1, int external)
{
int n, c, f, expanded;
Text *ct;
Expand e;
Rune *r;
uint p;
Plumbmsg *m;
Runestr dir;
char buf[32];
ct = seltext;
if(ct == nil)
seltext = t;
expanded = expand(t, q0, q1, &e);
if(!external && t->w!=nil && t->w->nopen[QWevent]>0){
/* send alphanumeric expansion to external client */
if(expanded == FALSE)
return;
f = 0;
if((e.u.at!=nil && t->w!=nil) || (e.nname>0 && lookfile(e.name, e.nname)!=nil))
f = 1; /* acme can do it without loading a file */
if(q0!=e.q0 || q1!=e.q1)
f |= 2; /* second (post-expand) message follows */
if(e.nname)
f |= 4; /* it's a file name */
c = 'l';
if(t->what == Body)
c = 'L';
n = q1-q0;
if(n <= EVENTSIZE){
r = runemalloc(n);
bufread(&t->file->b, q0, r, n);
winevent(t->w, "%c%d %d %d %d %.*S\n", c, q0, q1, f, n, n, r);
free(r);
}else
winevent(t->w, "%c%d %d %d 0 \n", c, q0, q1, f, n);
if(q0==e.q0 && q1==e.q1)
return;
if(e.nname){
n = e.nname;
if(e.a1 > e.a0)
n += 1+(e.a1-e.a0);
r = runemalloc(n);
runemove(r, e.name, e.nname);
if(e.a1 > e.a0){
r[e.nname] = ':';
bufread(&e.u.at->file->b, e.a0, r+e.nname+1, e.a1-e.a0);
}
}else{
n = e.q1 - e.q0;
r = runemalloc(n);
bufread(&t->file->b, e.q0, r, n);
}
f &= ~2;
if(n <= EVENTSIZE)
winevent(t->w, "%c%d %d %d %d %.*S\n", c, e.q0, e.q1, f, n, n, r);
else
winevent(t->w, "%c%d %d %d 0 \n", c, e.q0, e.q1, f, n);
free(r);
goto Return;
}
if(plumbsendfid != nil){
/* send whitespace-delimited word to plumber */
m = emalloc(sizeof(Plumbmsg));
m->src = estrdup("acme");
m->dst = nil;
dir = dirname(t, nil, 0);
if(dir.nr==1 && dir.r[0]=='.'){ /* sigh */
free(dir.r);
dir.r = nil;
dir.nr = 0;
}
if(dir.nr == 0)
m->wdir = estrdup(wdir);
else
m->wdir = runetobyte(dir.r, dir.nr);
free(dir.r);
m->type = estrdup("text");
m->attr = nil;
buf[0] = '\0';
if(q1 == q0){
if(t->q1>t->q0 && t->q0<=q0 && q0<=t->q1){
q0 = t->q0;
q1 = t->q1;
}else{
p = q0;
while(q0>0 && (c=tgetc(t, q0-1))!=' ' && c!='\t' && c!='\n')
q0--;
while(q1<t->file->b.nc && (c=tgetc(t, q1))!=' ' && c!='\t' && c!='\n')
q1++;
if(q1 == q0){
plumbfree(m);
goto Return;
}
sprint(buf, "click=%d", p-q0);
m->attr = plumbunpackattr(buf);
}
}
r = runemalloc(q1-q0);
bufread(&t->file->b, q0, r, q1-q0);
m->data = runetobyte(r, q1-q0);
m->ndata = strlen(m->data);
free(r);
if(m->ndata<messagesize-1024 && plumbsendtofid(plumbsendfid, m) >= 0){
plumbfree(m);
goto Return;
}
plumbfree(m);
/* plumber failed to match; fall through */
}
/* interpret alphanumeric string ourselves */
if(expanded == FALSE)
return;
if(e.name || e.u.at)
openfile(t, &e);
else{
if(t->w == nil)
return;
ct = &t->w->body;
if(t->w != ct->w)
winlock(ct->w, 'M');
if(t == ct)
textsetselect(ct, e.q1, e.q1);
n = e.q1 - e.q0;
r = runemalloc(n);
bufread(&t->file->b, e.q0, r, n);
if(search(ct, r, n) && e.jump)
moveto(mousectl, addpt(frptofchar(&ct->fr, ct->fr.p0), Pt(4, ct->fr.font->height-4)));
if(t->w != ct->w)
winunlock(ct->w);
free(r);
}
Return:
free(e.name);
free(e.bname);
}
int
plumbgetc(void *a, uint n)
{
Rune *r;
r = a;
if(n>runestrlen(r))
return 0;
return r[n];
}
void
plumblook(Plumbmsg *m)
{
Expand e;
char *addr;
if(m->ndata >= BUFSIZE){
warning(nil, "insanely long file name (%d bytes) in plumb message (%.32s...)\n", m->ndata, m->data);
return;
}
e.q0 = 0;
e.q1 = 0;
if(m->data[0] == '\0')
return;
e.u.ar = nil;
e.bname = m->data;
e.name = bytetorune(e.bname, &e.nname);
e.jump = TRUE;
e.a0 = 0;
e.a1 = 0;
addr = plumblookup(m->attr, "addr");
if(addr != nil){
e.u.ar = bytetorune(addr, &e.a1);
e.agetc = plumbgetc;
}
drawtopwindow();
openfile(nil, &e);
free(e.name);
free(e.u.at);
}
void
plumbshow(Plumbmsg *m)
{
Window *w;
Rune rb[256], *r;
int nb, nr;
Runestr rs;
char *name, *p, namebuf[16];
drawtopwindow();
w = makenewwindow(nil);
name = plumblookup(m->attr, "filename");
if(name == nil){
name = namebuf;
nuntitled++;
snprint(namebuf, sizeof namebuf, "Untitled-%d", nuntitled);
}
p = nil;
if(name[0]!='/' && m->wdir!=nil && m->wdir[0]!='\0'){
nb = strlen(m->wdir) + 1 + strlen(name) + 1;
p = emalloc(nb);
snprint(p, nb, "%s/%s", m->wdir, name);
name = p;
}
cvttorunes(name, strlen(name), rb, &nb, &nr, nil);
free(p);
rs = cleanrname(runestr(rb, nr));
winsetname(w, rs.r, rs.nr);
r = runemalloc(m->ndata);
cvttorunes(m->data, m->ndata, r, &nb, &nr, nil);
textinsert(&w->body, 0, r, nr, TRUE);
free(r);
w->body.file->mod = FALSE;
w->dirty = FALSE;
winsettag(w);
textscrdraw(&w->body);
textsetselect(&w->tag, w->tag.file->b.nc, w->tag.file->b.nc);
xfidlog(w, "new");
}
int
search(Text *ct, Rune *r, uint n)
{
uint q, nb, maxn;
int around;
Rune *s, *b, *c;
if(n==0 || n>ct->file->b.nc)
return FALSE;
if(2*n > RBUFSIZE){
warning(nil, "string too long\n");
return FALSE;
}
maxn = max(2*n, RBUFSIZE);
s = fbufalloc();
b = s;
nb = 0;
b[nb] = 0;
around = 0;
q = ct->q1;
for(;;){
if(q >= ct->file->b.nc){
q = 0;
around = 1;
nb = 0;
b[nb] = 0;
}
if(nb > 0){
c = runestrchr(b, r[0]);
if(c == nil){
q += nb;
nb = 0;
b[nb] = 0;
if(around && q>=ct->q1)
break;
continue;
}
q += (c-b);
nb -= (c-b);
b = c;
}
/* reload if buffer covers neither string nor rest of file */
if(nb<n && nb!=ct->file->b.nc-q){
nb = ct->file->b.nc-q;
if(nb >= maxn)
nb = maxn-1;
bufread(&ct->file->b, q, s, nb);
b = s;
b[nb] = '\0';
}
/* this runeeq is fishy but the null at b[nb] makes it safe */
if(runeeq(b, n, r, n)==TRUE){
if(ct->w){
textshow(ct, q, q+n, 1);
winsettag(ct->w);
}else{
ct->q0 = q;
ct->q1 = q+n;
}
seltext = ct;
fbuffree(s);
return TRUE;
}
--nb;
b++;
q++;
if(around && q>=ct->q1)
break;
}
fbuffree(s);
return FALSE;
}
int
isfilec(Rune r)
{
static Rune Lx[] = { '.', '-', '+', '/', ':', 0 };
if(isalnum(r))
return TRUE;
if(runestrchr(Lx, r))
return TRUE;
return FALSE;
}
/* Runestr wrapper for cleanname */
Runestr
cleanrname(Runestr rs)
{
char *s;
int nb, nulls;
s = runetobyte(rs.r, rs.nr);
cleanname(s);
cvttorunes(s, strlen(s), rs.r, &nb, &rs.nr, &nulls);
free(s);
return rs;
}
Runestr
includefile(Rune *dir, Rune *file, int nfile)
{
int m, n;
char *a;
Rune *r;
static Rune Lslash[] = { '/', 0 };
m = runestrlen(dir);
a = emalloc((m+1+nfile)*UTFmax+1);
sprint(a, "%S/%.*S", dir, nfile, file);
n = access(a, 0);
free(a);
if(n < 0)
return runestr(nil, 0);
r = runemalloc(m+1+nfile);
runemove(r, dir, m);
runemove(r+m, Lslash, 1);
runemove(r+m+1, file, nfile);
free(file);
return cleanrname(runestr(r, m+1+nfile));
}
static Rune *objdir;
Runestr
includename(Text *t, Rune *r, int n)
{
Window *w;
char buf[128];
Rune Lsysinclude[] = { '/', 's', 'y', 's', '/', 'i', 'n', 'c', 'l', 'u', 'd', 'e', 0 };
Rune Lusrinclude[] = { '/', 'u', 's', 'r', '/', 'i', 'n', 'c', 'l', 'u', 'd', 'e', 0 };
Rune Lusrlocalinclude[] = { '/', 'u', 's', 'r', '/', 'l', 'o', 'c', 'a', 'l',
'/', 'i', 'n', 'c', 'l', 'u', 'd', 'e', 0 };
Rune Lusrlocalplan9include[] = { '/', 'u', 's', 'r', '/', 'l', 'o', 'c', 'a', 'l',
'/', 'p', 'l', 'a', 'n', '9', '/', 'i', 'n', 'c', 'l', 'u', 'd', 'e', 0 };
Runestr file;
int i;
if(objdir==nil && objtype!=nil){
sprint(buf, "/%s/include", objtype);
objdir = bytetorune(buf, &i);
objdir = runerealloc(objdir, i+1);
objdir[i] = '\0';
}
w = t->w;
if(n==0 || r[0]=='/' || w==nil)
goto Rescue;
if(n>2 && r[0]=='.' && r[1]=='/')
goto Rescue;
file.r = nil;
file.nr = 0;
for(i=0; i<w->nincl && file.r==nil; i++)
file = includefile(w->incl[i], r, n);
if(file.r == nil)
file = includefile(Lsysinclude, r, n);
if(file.r == nil)
file = includefile(Lusrlocalplan9include, r, n);
if(file.r == nil)
file = includefile(Lusrlocalinclude, r, n);
if(file.r == nil)
file = includefile(Lusrinclude, r, n);
if(file.r==nil && objdir!=nil)
file = includefile(objdir, r, n);
if(file.r == nil)
goto Rescue;
return file;
Rescue:
return runestr(r, n);
}
Runestr
dirname(Text *t, Rune *r, int n)
{
Rune *b, c;
uint m, nt;
int slash;
Runestr tmp;
b = nil;
if(t==nil || t->w==nil)
goto Rescue;
nt = t->w->tag.file->b.nc;
if(nt == 0)
goto Rescue;
if(n>=1 && r[0]=='/')
goto Rescue;
b = runemalloc(nt+n+1);
bufread(&t->w->tag.file->b, 0, b, nt);
slash = -1;
for(m=0; m<nt; m++){
c = b[m];
if(c == '/')
slash = m;
if(c==' ' || c=='\t')
break;
}
if(slash < 0)
goto Rescue;
runemove(b+slash+1, r, n);
free(r);
return cleanrname(runestr(b, slash+1+n));
Rescue:
free(b);
tmp = runestr(r, n);
if(r)
return cleanrname(tmp);
return tmp;
}
int
expandfile(Text *t, uint q0, uint q1, Expand *e)
{
int i, n, nname, colon, eval;
uint amin, amax;
Rune *r, c;
Window *w;
Runestr rs;
amax = q1;
if(q1 == q0){
colon = -1;
while(q1<t->file->b.nc && isfilec(c=textreadc(t, q1))){
if(c == ':'){
colon = q1;
break;
}
q1++;
}
while(q0>0 && (isfilec(c=textreadc(t, q0-1)) || isaddrc(c) || isregexc(c))){
q0--;
if(colon<0 && c==':')
colon = q0;
}
/*
* if it looks like it might begin file: , consume address chars after :
* otherwise terminate expansion at :
*/
if(colon >= 0){
q1 = colon;
if(colon<t->file->b.nc-1 && isaddrc(textreadc(t, colon+1))){
q1 = colon+1;
while(q1<t->file->b.nc && isaddrc(textreadc(t, q1)))
q1++;
}
}
if(q1 > q0)
if(colon >= 0){ /* stop at white space */
for(amax=colon+1; amax<t->file->b.nc; amax++)
if((c=textreadc(t, amax))==' ' || c=='\t' || c=='\n')
break;
}else
amax = t->file->b.nc;
}
amin = amax;
e->q0 = q0;
e->q1 = q1;
n = q1-q0;
if(n == 0)
return FALSE;
/* see if it's a file name */
r = runemalloc(n);
bufread(&t->file->b, q0, r, n);
/* first, does it have bad chars? */
nname = -1;
for(i=0; i<n; i++){
c = r[i];
if(c==':' && nname<0){
if(q0+i+1<t->file->b.nc && (i==n-1 || isaddrc(textreadc(t, q0+i+1))))
amin = q0+i;
else
goto Isntfile;
nname = i;
}
}
if(nname == -1)
nname = n;
for(i=0; i<nname; i++)
if(!isfilec(r[i]))
goto Isntfile;
/*
* See if it's a file name in <>, and turn that into an include
* file name if so. Should probably do it for "" too, but that's not
* restrictive enough syntax and checking for a #include earlier on the
* line would be silly.
*/
if(q0>0 && textreadc(t, q0-1)=='<' && q1<t->file->b.nc && textreadc(t, q1)=='>'){
rs = includename(t, r, nname);
r = rs.r;
nname = rs.nr;
}
else if(amin == q0)
goto Isfile;
else{
rs = dirname(t, r, nname);
r = rs.r;
nname = rs.nr;
}
e->bname = runetobyte(r, nname);
/* if it's already a window name, it's a file */
w = lookfile(r, nname);
if(w != nil)
goto Isfile;
/* if it's the name of a file, it's a file */
if(ismtpt(e->bname) || access(e->bname, 0) < 0){
free(e->bname);
e->bname = nil;
goto Isntfile;
}
Isfile:
e->name = r;
e->nname = nname;
e->u.at = t;
e->a0 = amin+1;
eval = FALSE;
address(TRUE, nil, range(-1,-1), range(0,0), t, e->a0, amax, tgetc, &eval, (uint*)&e->a1);
return TRUE;
Isntfile:
free(r);
return FALSE;
}
int
expand(Text *t, uint q0, uint q1, Expand *e)
{
memset(e, 0, sizeof *e);
e->agetc = tgetc;
/* if in selection, choose selection */
e->jump = TRUE;
if(q1==q0 && t->q1>t->q0 && t->q0<=q0 && q0<=t->q1){
q0 = t->q0;
q1 = t->q1;
if(t->what == Tag)
e->jump = FALSE;
}
if(expandfile(t, q0, q1, e))
return TRUE;
if(q0 == q1){
while(q1<t->file->b.nc && isalnum(textreadc(t, q1)))
q1++;
while(q0>0 && isalnum(textreadc(t, q0-1)))
q0--;
}
e->q0 = q0;
e->q1 = q1;
return q1 > q0;
}
Window*
lookfile(Rune *s, int n)
{
int i, j, k;
Window *w;
Column *c;
Text *t;
/* avoid terminal slash on directories */
if(n>1 && s[n-1] == '/')
--n;
for(j=0; j<row.ncol; j++){
c = row.col[j];
for(i=0; i<c->nw; i++){
w = c->w[i];
t = &w->body;
k = t->file->nname;
if(k>1 && t->file->name[k-1] == '/')
k--;
if(runeeq(t->file->name, k, s, n)){
w = w->body.file->curtext->w;
if(w->col != nil) /* protect against race deleting w */
return w;
}
}
}
return nil;
}
Window*
lookid(int id, int dump)
{
int i, j;
Window *w;
Column *c;
for(j=0; j<row.ncol; j++){
c = row.col[j];
for(i=0; i<c->nw; i++){
w = c->w[i];
if(dump && w->dumpid == id)
return w;
if(!dump && w->id == id)
return w;
}
}
return nil;
}
Window*
openfile(Text *t, Expand *e)
{
Range r;
Window *w, *ow;
int eval, i, n;
Rune *rp;
Runestr rs;
uint dummy;
r.q0 = 0;
r.q1 = 0;
if(e->nname == 0){
w = t->w;
if(w == nil)
return nil;
}else{
w = lookfile(e->name, e->nname);
if(w == nil && e->name[0] != '/'){
/*
* Unrooted path in new window.
* This can happen if we type a pwd-relative path
* in the topmost tag or the column tags.
* Most of the time plumber takes care of these,
* but plumber might not be running or might not
* be configured to accept plumbed directories.
* Make the name a full path, just like we would if
* opening via the plumber.
*/
n = utflen(wdir)+1+e->nname+1;
rp = runemalloc(n);
runesnprint(rp, n, "%s/%.*S", wdir, e->nname, e->name);
rs = cleanrname(runestr(rp, n-1));
free(e->name);
e->name = rs.r;
e->nname = rs.nr;
w = lookfile(e->name, e->nname);
}
}
if(w){
t = &w->body;
if(!t->col->safe && t->fr.maxlines==0) /* window is obscured by full-column window */
colgrow(t->col, t->col->w[0], 1);
}else{
ow = nil;
if(t)
ow = t->w;
w = makenewwindow(t);
t = &w->body;
winsetname(w, e->name, e->nname);
if(textload(t, 0, e->bname, 1) >= 0)
t->file->unread = FALSE;
t->file->mod = FALSE;
t->w->dirty = FALSE;
winsettag(t->w);
textsetselect(&t->w->tag, t->w->tag.file->b.nc, t->w->tag.file->b.nc);
if(ow != nil){
for(i=ow->nincl; --i>=0; ){
n = runestrlen(ow->incl[i]);
rp = runemalloc(n);
runemove(rp, ow->incl[i], n);
winaddincl(w, rp, n);
}
w->autoindent = ow->autoindent;
}else
w->autoindent = globalautoindent;
xfidlog(w, "new");
}
if(e->a1 == e->a0)
eval = FALSE;
else{
eval = TRUE;
r = address(TRUE, t, range(-1,-1), range(t->q0, t->q1), e->u.at, e->a0, e->a1, e->agetc, &eval, &dummy);
if(r.q0 > r.q1) {
eval = FALSE;
warning(nil, "addresses out of order\n");
}
if(eval == FALSE)
e->jump = FALSE; /* don't jump if invalid address */
}
if(eval == FALSE){
r.q0 = t->q0;
r.q1 = t->q1;
}
textshow(t, r.q0, r.q1, 1);
winsettag(t->w);
seltext = t;
if(e->jump)
moveto(mousectl, addpt(frptofchar(&t->fr, t->fr.p0), Pt(4, font->height-4)));
return w;
}
void
new(Text *et, Text *t, Text *argt, int flag1, int flag2, Rune *arg, int narg)
{
int ndone;
Rune *a, *f;
int na, nf;
Expand e;
Runestr rs;
Window *w;
getarg(argt, FALSE, TRUE, &a, &na);
if(a){
new(et, t, nil, flag1, flag2, a, na);
if(narg == 0)
return;
}
/* loop condition: *arg is not a blank */
for(ndone=0; ; ndone++){
a = findbl(arg, narg, &na);
if(a == arg){
if(ndone==0 && et->col!=nil) {
w = coladd(et->col, nil, nil, -1);
winsettag(w);
xfidlog(w, "new");
}
break;
}
nf = narg-na;
f = runemalloc(nf);
runemove(f, arg, nf);
rs = dirname(et, f, nf);
memset(&e, 0, sizeof e);
e.name = rs.r;
e.nname = rs.nr;
e.bname = runetobyte(rs.r, rs.nr);
e.jump = TRUE;
openfile(et, &e);
free(e.name);
free(e.bname);
arg = skipbl(a, na, &narg);
}
}