feat: make specs executable

README.md

@@ -181,6 +181,16 @@ paths:
           description: OK
 ```
 
+## Executable Specs
+
+You can make you spec an executable program, add the following line:
+
+```yaml
+#!/usr/bin/env sim
+```
+
+Make your YAML executable with `chmod +x`.
+
 ## Reference
 
 In you script you have access to the following:

examples/hello.yaml

@@ -1,3 +1,4 @@
+#!/usr/bin/env sim
 openapi: 3.0.0
 info:
   title: Hello API 2

examples/scripting.yaml

@@ -1,3 +1,4 @@
+#!/usr/bin/env sim
 openapi: 3.0.0
 info:
   title: Teapot API

examples/state.yaml

@@ -1,3 +1,4 @@
+#!/usr/bin/env sim
 openapi: 3.0.0
 info:
   title: Document API

main.go

@@ -48,15 +48,25 @@ func main() {
 		if err := watcher.Add(path); err != nil {
 			log.Fatalf("Error watching directory: %s\n", err)
 		}
-		dir, err := os.ReadDir(path)
+		stat, err := os.Stat(path)
 		if err != nil {
-			log.Fatalf("Error reading directory: %s\n", err)
+			log.Fatal(err)
 		}
-		for _, file := range dir {
-			if filepath.Ext(file.Name()) != ".yaml" {
-				continue
+		if stat.IsDir() {
+			dir, err := os.ReadDir(path)
+			if err != nil {
+				log.Fatalf("Error reading directory: %s\n", err)
 			}
-			if err := sim.add(filepath.Join(path, file.Name())); err != nil {
+			for _, file := range dir {
+				if filepath.Ext(file.Name()) != ".yaml" {
+					continue
+				}
+				if err := sim.add(filepath.Join(path, file.Name())); err != nil {
+					log.Fatalf("Error adding spec: %s\n", err)
+				}
+			}
+		} else {
+			if err := sim.add(path); err != nil {
 				log.Fatalf("Error adding spec: %s\n", err)
 			}
 		}