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implement Adiff;
include "sys.m";
include "draw.m";
include "sh.m";
include "workdir.m";
include "bufio.m";
Adiff : module {
init : fn(ctxt : ref Draw->Context, argl : list of string);
};
sys : Sys;
Context : import Draw;
OREAD, OWRITE, QTDIR, FD, FORKFD, open, read, write, sprint, fprint, stat, fildes, dup, pctl : import sys;
init(ctxt : ref Context, argl : list of string)
{
sys = load Sys Sys->PATH;
workdir := load Workdir Workdir->PATH;
stderr := fildes(2);
if (len argl != 3) {
fprint(stderr, "usage: adiff file1 file2\n");
return;
}
ncfd := open("/chan/new/ctl", OREAD);
if (ncfd == nil) {
fprint(stderr, "cannot open ctl file\n");
return;
}
b := array[128] of byte;
n := read(ncfd, b, len b);
id := string int string b[0:n];
f1 := hd tl argl;
f2 := hd tl tl argl;
(ok1, d1) := stat(f1);
if (ok1 < 0) {
fprint(stderr, "cannot stat %s\n", f1);
return;
}
(ok2, d2) := stat(f2);
if (ok2 < 0) {
fprint(stderr, "cannot stat %s\n", f2);
return;
}
if (d1.qid.qtype & QTDIR)
f1 = f1 + "/" + basename(f2);
else if (d2.qid.qtype & QTDIR)
f2 = f2 + "/" + basename(f1);
buf := "/chan/" + id + "/ctl";
icfd := open(buf, OWRITE);
if (icfd == nil) {
fprint(stderr, "cannot open control file\n");
return;
}
buf = "name " + workdir->init() + "/-diff-" + f1 + "\n";
b = array of byte buf;
write(icfd, b, len b);
fds := array[2] of ref FD;
if (sys->pipe(fds) < 0) {
fprint(stderr, "can't pipe\n");
return;
}
buf = "/chan/" + id + "/body";
bfd := open(buf, OWRITE);
if (bfd == nil) {
fprint(stderr, "cannot open body file\n");
return;
}
spawn diff(fds[1], f1, f2, ctxt);
fds[1] = nil;
awk(fds[0], bfd, f1, f2);
b = array of byte "clean\n";
write(icfd, b, len b);
}
strchr(s : string, c : int) : int
{
for (i := 0; i < len s; i++)
if (s[i] == c)
return i;
return -1;
}
strchrs(s, pat : string) : int
{
for (i := 0; i < len s; i++)
if (strchr(pat, s[i]) >= 0)
return i;
return -1;
}
awk(ifd, ofd : ref FD, f1, f2 : string)
{
bufio := load Bufio Bufio->PATH;
Iobuf : import bufio;
b := bufio->fopen(ifd, OREAD);
while ((s := b.gets('\n')) != nil) {
if (s[0] >= '1' && s[0] <= '9') {
if ((n := strchrs(s, "acd")) >= 0)
s = f1 + ":" + s[0:n] + " " + s[n:n+1] + " " + f2 + ":" + s[n+1:];
}
fprint(ofd, "%s", s);
}
}
diff(ofd : ref FD, f1, f2 : string, ctxt : ref Context)
{
args : list of string;
pctl(FORKFD, nil);
fd := open("/dev/null", OREAD);
dup(fd.fd, 0);
fd = nil;
dup(ofd.fd, 1);
dup(1, 2);
ofd = nil;
args = nil;
args = f2 :: args;
args = f1 :: args;
args = "diff" :: args;
exec("diff", args, ctxt);
exit;
}
exec(cmd : string, argl : list of string, ctxt : ref Context)
{
file := cmd;
if(len file<4 || file[len file-4:]!=".dis")
file += ".dis";
c := load Command file;
if(c == nil) {
err := sprint("%r");
if(file[0]!='/' && file[0:2]!="./"){
c = load Command "/dis/"+file;
if(c == nil)
err = sprint("%r");
}
if(c == nil){
fprint(fildes(2), "%s: %s\n", cmd, err);
return;
}
}
c->init(ctxt, argl);
}
basename(s : string) : string
{
for (i := len s -1; i >= 0; --i)
if (s[i] == '/')
return s[i+1:];
return s;
}
|
