feat: add shell autocompletion to goreleaser for bash and zsh (#1859)

cmd/completion.go

@@ -0,0 +1,34 @@
+package cmd
+
+import (
+	"github.com/spf13/cobra"
+)
+
+type completionCmd struct {
+	cmd *cobra.Command
+}
+
+func newCompletionCmd() *completionCmd {
+	var root = &completionCmd{}
+	var cmd = &cobra.Command{
+		Use:          "completion",
+		Short:        "Print shell autocompletion scripts for goreleaser for bash and zsh",
+		SilenceUsage: true,
+		ValidArgs:    []string{"bash", "zsh"},
+		Args:         cobra.ExactValidArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			var err error
+			switch args[0] {
+			case "bash":
+				err = cmd.Root().GenBashCompletion(cmd.OutOrStdout())
+			case "zsh":
+				err = cmd.Root().GenZshCompletion(cmd.OutOrStdout())
+			}
+
+			return err
+		},
+	}
+
+	root.cmd = cmd
+	return root
+}

cmd/completion_test.go

@@ -0,0 +1,23 @@
+package cmd
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestCompletionGeneration(t *testing.T) {
+	for _, shell := range []string{"bash", "zsh"} {
+		completionCmd := newCompletionCmd().cmd
+		stdout := bytes.NewBufferString("")
+		stderr := bytes.NewBufferString("")
+		completionCmd.SetOut(stdout)
+		completionCmd.SetErr(stderr)
+		completionCmd.SetArgs([]string{shell})
+		err := completionCmd.Execute()
+		require.NoError(t, err, shell+" arg experienced error with goreleaser completion:\n"+stderr.String())
+		require.Equal(t, "", stderr.String(), shell+" arg experienced error with goreleaser completion:\n"+stderr.String())
+		require.NotEmpty(t, stdout.String(), shell+" arg reported nothing to stdout with goreleaser completion")
+	}
+}

cmd/root.go

@@ -74,6 +74,7 @@ func newRootCmd(version string, exit func(int)) *rootCmd {
 		newReleaseCmd().cmd,
 		newCheckCmd().cmd,
 		newInitCmd().cmd,
+		newCompletionCmd().cmd,
 	)
 
 	root.cmd = cmd