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implement Merge, Fsmodule;
include "sys.m";
sys: Sys;
include "draw.m";
include "sh.m";
include "alphabet/reports.m";
Report: import Reports;
include "alphabet/fs.m";
fs: Fs;
Value: import fs;
Fschan, Fsdata, Entrychan, Cmpchan, Entry,
Gatechan, Gatequery, Nilentry, Option,
Next, Down, Skip, Quit: import Fs;
Merge: module {};
# e.g....
# fs select {mode -d} {merge -c {compose -d AoutB} {filter {not {path /chan /dev /usr/rog /n/local /net}} /} {merge {proto FreeBSD} {proto Hp} {proto Irix} {proto Linux} {proto MacOSX} {proto Nt} {proto Nt.ti} {proto Nt.ti925} {proto Plan9} {proto Plan9.ti} {proto Plan9.ti925} {proto Solaris} {proto authsrv} {proto dl} {proto dlsrc} {proto ep7} {proto inferno} {proto inferno.ti} {proto ipaqfs} {proto minitel} {proto os} {proto scheduler.client} {proto scheduler.server} {proto sds} {proto src} {proto src.ti} {proto sword} {proto ti925.ti} {proto ti925bin} {proto tipaq} {proto umec} {proto utils} {proto utils.ti}}} >[2] /dev/null
types(): string
{
return "xxxx*-1-cm";
}
init()
{
sys = load Sys Sys->PATH;
fs = load Fs Fs->PATH;
if(fs == nil){
sys->fprint(sys->fildes(2), "fs: cannot load %s: %r\n", Fs->PATH);
raise "fail:bad module";
}
fs->init();
}
run(nil: ref Draw->Context, nil: ref Report,
opts: list of Option, args: list of ref Value): ref Value
{
recurse := 1;
cmp: Cmpchan;
for(; opts != nil; opts = tl opts){
case (hd opts).opt {
'1' =>
recurse = 0;
'c' =>
cmp = (hd (hd opts).args).m().i;
}
}
dst := chan of (Fsdata, chan of int);
spawn mergeproc((hd args).x().i, (hd tl args).x().i, dst, recurse, cmp, tl tl args == nil);
for(args = tl tl args; args != nil; args = tl args){
dst1 := chan of (Fsdata, chan of int);
spawn mergeproc(dst, (hd args).x().i, dst1, recurse, cmp, tl args == nil);
dst = dst1;
}
return ref Value.Vx(dst);
}
# merge two trees; assume directories are alphabetically sorted.
mergeproc(c0, c1, dst: Fschan, recurse: int, cmp: Cmpchan, killcmp: int)
{
myreply := chan of int;
((d0, nil), reply0) := <-c0;
((d1, nil), reply1) := <-c1;
if(compare(cmp, d0, d1) == 2r10)
dst <-= ((d1, nil), myreply);
else
dst <-= ((d0, nil), myreply);
r := <-myreply;
reply0 <-= r;
reply1 <-= r;
if(r == Down){
{
mergedir(c0, c1, dst, recurse, cmp);
} exception {"exit" =>;}
}
if(cmp != nil && killcmp)
cmp <-= (nil, nil, nil);
}
mergedir(c0, c1, dst: Fschan, recurse: int, cmp: Cmpchan)
{
myreply := chan of int;
reply0, reply1: chan of int;
d0, d1: ref Sys->Dir;
eof0 := eof1 := 0;
for(;;){
if(!eof0 && d0 == nil){
((d0, nil), reply0) = <-c0;
if(d0 == nil){
reply0 <-= Next;
eof0 = 1;
}
}
if(!eof1 && d1 == nil){
((d1, nil), reply1) = <-c1;
if(d1 == nil){
reply1 <-= Next;
eof1 = 1;
}
}
if(eof0 && eof1)
break;
(wd0, wd1) := (d0, d1);
if(d0 != nil && d1 != nil && d0.name != d1.name){
if(d0.name < d1.name)
wd1 = nil;
else
wd0 = nil;
}
wc0, wc1: Fschan;
wreply0, wreply1: chan of int;
weof0, weof1: int;
c := compare(cmp, wd0, wd1);
if(wd0 != nil && wd1 != nil){
if(c != 0 && recurse && (wd0.mode & wd1.mode & Sys->DMDIR) != 0){
dst <-= ((wd0, nil), myreply);
r := <-myreply;
reply0 <-= r;
reply1 <-= r;
d0 = d1 = nil;
case r {
Quit =>
raise "exit";
Skip =>
return;
Down =>
mergedir(c0, c1, dst, 1, cmp);
}
continue;
}
# when we can't merge and there's a clash, choose c0 over c1, unless cmp says otherwise
if(c == 2r10){
reply0 <-= Next;
d0 = nil;
}else{
reply1 <-= Next;
d1 = nil;
}
}
if(c & 2r01){
(wd0, wc0, wreply0, weof0) = (d0, c0, reply0, eof0);
(wd1, wc1, wreply1, weof1) = (d1, c1, reply1, eof1);
d0 = nil;
}else if(c & 2r10){
(wd0, wc0, wreply0, weof0) = (d1, c1, reply1, eof1);
(wd1, wc1, wreply1, weof1) = (d0, c0, reply0, eof0);
d1 = nil;
}else{
if(wd0 == nil){
reply1 <-= Next;
d1 = nil;
}else{
reply0 <-= Next;
d0 = nil;
}
continue;
}
dst <-= ((wd0, nil), myreply);
r := <-myreply;
wreply0 <-= r;
if(r == Down)
r = fs->copy(wc0, dst); # XXX hmm, maybe this should be a mergedir()
case r {
Quit or
Skip =>
if(wd1 == nil && !weof1)
(nil, wreply1) = <-wc1;
wreply1 <-= r;
if(r == Quit)
raise "exit";
return;
}
}
dst <-= ((nil, nil), myreply);
if(<-myreply == Quit)
raise "exit";
}
compare(cmp: Cmpchan, d0, d1: ref Sys->Dir): int
{
mask := (d0 != nil) | (d1 != nil) << 1;
if(cmp == nil)
return mask;
reply := chan of int;
cmp <-= (d0, d1, reply);
return <-reply & mask;
}
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