More files related to user-level file servers.
Also add acme!
diff --git a/src/cmd/acme/look.c b/src/cmd/acme/look.c
new file mode 100644
index 0000000..9f54f9e
--- /dev/null
+++ b/src/cmd/acme/look.c
@@ -0,0 +1,772 @@
+#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 <plumb.h>
+#include "dat.h"
+#include "fns.h"
+
+Window* openfile(Text*, Expand*);
+
+int nuntitled;
+
+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(plumbsendfd >= 0){
+ /* 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 && plumbsend(plumbsendfd, 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<0 || 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;
+ }
+ 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];
+
+ 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);
+}
+
+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;
+ }
+ if(around && q>=ct->q1)
+ break;
+ --nb;
+ b++;
+ q++;
+ }
+ 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
+cleanrname(Runestr rs)
+{
+ int i, j, found;
+ Rune *b;
+ int n;
+ static Rune Lslashdotdot[] = { '/', '.', '.', 0 };
+
+ b = rs.r;
+ n = rs.nr;
+
+ /* compress multiple slashes */
+ for(i=0; i<n-1; i++)
+ if(b[i]=='/' && b[i+1]=='/'){
+ runemove(b+i, b+i+1, n-i-1);
+ --n;
+ --i;
+ }
+ /* eliminate ./ */
+ for(i=0; i<n-1; i++)
+ if(b[i]=='.' && b[i+1]=='/' && (i==0 || b[i-1]=='/')){
+ runemove(b+i, b+i+2, n-i-2);
+ n -= 2;
+ --i;
+ }
+ /* eliminate trailing . */
+ if(n>=2 && b[n-2]=='/' && b[n-1]=='.')
+ --n;
+ do{
+ /* compress xx/.. */
+ found = FALSE;
+ for(i=1; i<=n-3; i++)
+ if(runeeq(b+i, 3, Lslashdotdot, 3)){
+ if(i==n-3 || b[i+3]=='/'){
+ found = TRUE;
+ break;
+ }
+ }
+ if(found)
+ for(j=i-1; j>=0; --j)
+ if(j==0 || b[j-1]=='/'){
+ i += 3; /* character beyond .. */
+ if(i<n && b[i]=='/')
+ ++i;
+ runemove(b+j, b+i, n-i);
+ n -= (i-j);
+ break;
+ }
+ }while(found);
+ if(n == 0){
+ *b = '.';
+ n = 1;
+ }
+ return (Runestr){b, n};
+}
+
+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 };
+ 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 && 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-1 && 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(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(nil, 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;
+ uint dummy;
+
+ if(e->nname == 0){
+ w = t->w;
+ if(w == nil)
+ return nil;
+ }else
+ 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);
+ textload(t, 0, e->bname, 1);
+ 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);
+ }
+ }
+ if(e->a1 == e->a0)
+ eval = FALSE;
+ else{
+ eval = TRUE;
+ r = address(nil, t, (Range){-1, -1}, (Range){t->q0, t->q1}, e->u.at, e->a0, e->a1, e->agetc, &eval, &dummy);
+ 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;
+
+ 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)
+ winsettag(coladd(et->col, nil, nil, -1));
+ break;
+ }
+ nf = narg-na;
+ f = runemalloc(nf);
+ runemove(f, arg, nf);
+ rs = dirname(et, f, nf);
+ f = rs.r;
+ nf = rs.nr;
+ memset(&e, 0, sizeof e);
+ e.name = f;
+ e.nname = nf;
+ e.bname = runetobyte(f, nf);
+ e.jump = TRUE;
+ openfile(et, &e);
+ free(f);
+ free(e.bname);
+ arg = skipbl(a, na, &narg);
+ }
+}
