commit ee2e2e1199855f8b0b515d61d819e35a97b54f23
author Jean de Klerk <deklerk@google.com> Thu Dec 20 17:44:27 2018 -0800
committer Jonathan Amsterdam <jba@google.com> Fri Dec 21 18:34:42 2018 +0000
tree 3fc0c6f571937090a3a8e2e1e50db478b6cd5057
parent 6d0764842bd11cf1d786b7f508dc9ee02a636c65

cmd/apidiff: check for package existence

This provides a nicer error experience when providing a package that does not
exist.

Change-Id: I816df12556832af67f432cccd91da2dc5232b798
Reviewed-on: https://go-review.googlesource.com/c/155577
Reviewed-by: Jonathan Amsterdam <jba@google.com>

cmd/apidiff/main.go

diff --git a/cmd/apidiff/main.go b/cmd/apidiff/main.go
index 552062e..7cc0caf 100644
--- a/cmd/apidiff/main.go
+++ b/cmd/apidiff/main.go
@@ -92,6 +92,9 @@
 	if err != nil {
 		return nil, err
 	}
+	if len(pkgs) == 0 {
+		return nil, fmt.Errorf("found no packages for import %s", importPath)
+	}
 	if len(pkgs[0].Errors) > 0 {
 		return nil, pkgs[0].Errors[0]
 	}