fix error message when main() is missing

matthewmueller · Jan 7, 2018 · 573e9a7 · 573e9a7
1 parent b6bb4e1
commit 573e9a7
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Showing 2 changed files with 4 additions and 0 deletions.
diff --git a/api/run/run.go b/api/run/run.go
@@ -68,6 +68,8 @@ func Run(cfg *Config) (result string, err error) {
 	})
 	if err != nil {
 		return result, errors.Wrapf(err, "unable to compile file")
+	} else if len(files) == 0 {
+		return result, fmt.Errorf("a main file requires a main function to build")
 	} else if len(files) != 1 {
 		return result, fmt.Errorf("joy run expects only 1 main file, but received %d files", len(files))
 	}

diff --git a/internal/cli/cli.go b/internal/cli/cli.go
@@ -68,6 +68,8 @@ func Run(ctx context.Context, ver string) (err error) {
 			})
 			if err != nil {
 				return errors.Wrapf(err, "error building code")
+			} else if len(files) == 0 {
+				return fmt.Errorf("a main file requires a main function to build")
 			} else if len(files) != 1 {
 				return fmt.Errorf("joy run expects only 1 main file, but received %d files", len(files))
 			}