Add break tools

Author: bindung

Diff for: pkg/engine/engine.go

@@ -245,6 +245,8 @@ func (e *Engine) Start(ctx Context, input string) (ret *Return, _ error) {
 			return e.runOpenAPI(tool, input)
 		} else if tool.IsEcho() {
 			return e.runEcho(tool)
+		} else if tool.IsBreak() {
+			return e.runBreak(tool)
 		}
 		s, err := e.runCommand(ctx, tool, input, ctx.ToolCategory)
 		if err != nil {

Diff for: pkg/types/tool.go

@@ -17,6 +17,7 @@ const (
 	DaemonPrefix  = "#!sys.daemon"
 	OpenAPIPrefix = "#!sys.openapi"
 	EchoPrefix    = "#!sys.echo"
+	BreakPrefix   = "#!sys.break"
 	CommandPrefix = "#!"
 )
 
@@ -484,6 +485,10 @@ func (t Tool) IsEcho() bool {
 	return strings.HasPrefix(t.Instructions, EchoPrefix)
 }
 
+func (t Tool) IsBreak() bool {
+	return strings.HasPrefix(t.Instructions, BreakPrefix)
+}
+
 func (t Tool) IsHTTP() bool {
 	return strings.HasPrefix(t.Instructions, "#!http://") ||
 		strings.HasPrefix(t.Instructions, "#!https://")