1 files changed, 54 insertions, 0 deletions
diff --git a/appl/alphabet/fs/depth.b b/appl/alphabet/fs/depth.b
new file mode 100644
index 00000000..9787fd54
--- /dev/null
+++ b/appl/alphabet/fs/depth.b
@@ -0,0 +1,54 @@
+implement Depth, 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, Entry,
+	Gatechan, Gatequery, Nilentry, Option,
+	Next, Down, Skip, Quit: import Fs;
+
+Depth: module {};
+
+types(): string
+{
+	return "ps";
+}
+
+badmod(p: string)
+{
+	sys->fprint(sys->fildes(2), "fs: size: cannot load %s: %r\n", p);
+	raise "fail:bad module";
+}
+
+init()
+{
+	sys = load Sys Sys->PATH;
+	fs = load Fs Fs->PATH;
+	if(fs == nil)
+		badmod(Fs->PATH);
+	fs->init();
+}
+
+run(nil: ref Draw->Context, nil: ref Report,
+			nil: list of Option, args: list of ref Value): ref Value
+{
+	d := int (hd args).s().i;
+	if(d <= 0){
+		sys->fprint(sys->fildes(2), "fs: depth: invalid depth\n");
+		return nil;
+	}
+	c := chan of Gatequery;
+	spawn depthgate(c, d);
+	return ref Value.Vp(c);
+}
+
+depthgate(c: Gatechan, d: int)
+{
+	while((((dir, nil, depth), reply) := <-c).t0.t0 != nil)
+		reply <-= depth <= d;
+}