Update root command to handle stdin and args

README.md

@@ -116,6 +116,13 @@ $ echo 'QUESTION' | askai
 $ askai < question.txt
 ```
 
+It is possible to pass both input from stdin and arguments at the same time.  
+By utilizing this, for example, you can also summarize the contents of a specific file.
+
+```console
+$ cat README.md | askai 'Please summarize this content'
+```
+
 ## LICENSE
 
 [MIT](./LICENSE)

cmd/root.go

@@ -59,22 +59,26 @@ var rootCmd = &cobra.Command{
 			uicfg.Model = openai.GPT3Dot5Turbo
 		}
 
-		var q string
+		q := ""
 		if len(args) > 0 {
 			q = strings.Join(args, " ")
-		} else {
-			info, err := os.Stdin.Stat()
-			if err != nil {
+		}
+
+		info, err := os.Stdin.Stat()
+		if err != nil {
+			return err
+		}
+		if info.Mode()&os.ModeCharDevice == 0 {
+			b := new(bytes.Buffer)
+			if _, err := b.ReadFrom(os.Stdin); err != nil {
 				return err
 			}
-			if info.Mode()&os.ModeCharDevice == 0 {
-				b := new(bytes.Buffer)
-				if _, err := b.ReadFrom(os.Stdin); err != nil {
-					return err
-				}
-				q = b.String()
+			if q != "" {
+				q += "\n\n"
 			}
+			q += b.String()
 		}
+
 		if q != "" {
 			uicfg.Question = &q
 		}