diff -r 000000000000 -r 1918ee327afb src/scripttools/debugging/scripts/commands/break.qs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/scripttools/debugging/scripts/commands/break.qs	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,59 @@
+name = "break";
+
+group = "breakpoints";
+
+shortDescription = "Set a breakpoint at specified location";
+
+longDescription = "break <file>:<line> : Sets a breakpoint at the given location.";
+longDescription += "\nbreak <line> : Sets a breakpoint at the given line of the current file.";
+
+argumentTypes = [ "script-filename" ];
+
+aliases = [ "b" ];
+
+seeAlso = [ "condition", "delete", "disable", "tbreak" ];
+
+function execute() {
+    if (arguments.length == 0) {
+        message("Missing argument.");
+        return;
+    }
+    var arg = arguments[0];
+    var colonIndex = arg.lastIndexOf(':');
+    if (colonIndex == -1) {
+        lineNumber = parseInt(arg);
+        if (isNaN(lineNumber)) {
+            message("Breakpoint location must be of the form <file>:<line> or <line>.");
+            return;
+        }
+        var sid = getCurrentScriptId();
+        if (sid == -1) {
+            message("No script.");
+            return;
+        }
+        scheduleGetScriptData(sid);
+        scriptId = sid;
+        state = 1;
+    } else {
+        fileName = arg.slice(0, colonIndex);
+        lineNumber = parseInt(arg.slice(colonIndex+1));
+        // ### resolve the script to see if it's loaded or not? (e.g. so we can issue a warning)
+        scheduleSetBreakpoint({ fileName: fileName, lineNumber: lineNumber});
+        state = 2;
+    }
+}
+
+function handleResponse(resp) {
+    if (state == 1) {
+        fileName = resp.result.fileName;
+        if (fileName.length == 0)
+            fileName = "<anonymous script, id=" + scriptId + ">";
+        scheduleSetBreakpoint({ scriptId: scriptId, lineNumber: lineNumber});
+        state = 2;
+    } else if (state == 2) {
+        if (resp.error == 0) {
+            var id = resp.result;
+            message("Breakpoint " + id + ": " + fileName + ", line " + lineNumber + ".");
+        }
+    }
+}