Fix: bug where old file name would be reused

There was a bug where the command would reference an old file name which would be deleted which meant that the code block would not execute on future executions and only work the first time.

internal/code/code.go

@@ -80,6 +80,8 @@ func Execute(code Block) Result {
 			ExitCode: ExitCodeInternalError,
 		}
 	}
+
+	defer f.Close()
 	defer os.Remove(f.Name())
 
 	_, err = f.WriteString(code.Code)
@@ -108,14 +110,19 @@ func Execute(code Block) Result {
 	start := time.Now()
 
 	for _, c := range language.Commands {
+		var command []string
 		// replace <file>, <name> and <path> in commands
-		for i, v := range c {
-			c[i] = repl.Replace(v)
+		for _, v := range c {
+			command = append(command, repl.Replace(v))
 		}
 		// execute and write output
-		cmd := exec.Command(c[0], c[1:]...)
+		cmd := exec.Command(command[0], command[1:]...)
 		out, err := cmd.Output()
-		output.Write(out)
+		if err != nil {
+			output.Write([]byte(err.Error()))
+		} else {
+			output.Write(out)
+		}
 
 		// update status code
 		if err != nil {

internal/code/execute_test.go

@@ -45,7 +45,7 @@ func main() {
 				Language: "bash",
 			},
 			expected: code.Result{
-				Out:      "",
+				Out:      "exit status 127",
 				ExitCode: 1,
 			},
 		},