Introduce cfn command template

.gitignore

@@ -24,4 +24,5 @@ data
 localstack
 /s3hub
 /spare
+/cfn
 .envrc

Makefile

@@ -2,6 +2,7 @@
 
 S3HUB       = s3hub
 SPARE       = spare
+CFN         = cfn
 VERSION     = $(shell git describe --tags --abbrev=0)
 GO          = go
 GO_BUILD    = $(GO) build
@@ -18,9 +19,10 @@ GO_LDFLAGS  = -ldflags '-X github.com/nao1215/rainbow/version.Version=${VERSION}
 build:  ## Build binary
 	env GO111MODULE=on GOOS=$(GOOS) GOARCH=$(GOARCH) $(GO_BUILD) $(GO_LDFLAGS) -o $(S3HUB) cmd/s3hub/main.go
 	env GO111MODULE=on GOOS=$(GOOS) GOARCH=$(GOARCH) $(GO_BUILD) $(GO_LDFLAGS) -o $(SPARE) cmd/spare/main.go
+	env GO111MODULE=on GOOS=$(GOOS) GOARCH=$(GOARCH) $(GO_BUILD) $(GO_LDFLAGS) -o $(CFN) cmd/cfn/main.go
 
 clean: ## Clean project
-	-rm -rf $(S3HUB) $(SPARE) cover.out cover.html
+	-rm -rf $(S3HUB) $(SPARE) $(CFN) cover.out cover.html
 
 test: ## Start unit test
 	env GOOS=$(GOOS) $(GO_TEST) -coverpkg=./... -coverprofile=cover.out.tmp -cover ./...

cmd/cfn/main.go

@@ -0,0 +1,16 @@
+// Package main is the entrypoint of s3hub.
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/nao1215/rainbow/cmd/subcmd/cfn"
+)
+
+func main() {
+	if err := cfn.Execute(); err != nil {
+		fmt.Fprintf(os.Stderr, "%s\n", err)
+		os.Exit(1)
+	}
+}

cmd/subcmd/cfn/common.go

@@ -0,0 +1,6 @@
+package cfn
+
+// commandName returns the cfn command name.
+func commandName() string {
+	return "cfn"
+}

cmd/subcmd/cfn/root.go

@@ -0,0 +1,30 @@
+// Package cfn is the root command of cfn.
+package cfn
+
+import (
+	"github.com/spf13/cobra"
+)
+
+// Execute starts the root command of cfn command.
+func Execute() error {
+	if err := newRootCmd().Execute(); err != nil {
+		return err
+	}
+	return nil
+}
+
+// newRootCmd returns a root command for cfn.
+func newRootCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "cfn",
+		Short: `cfn is a command line tool for AWS CloudFormation.`,
+	}
+
+	cmd.CompletionOptions.DisableDefaultCmd = true
+	cmd.SilenceUsage = true
+	cmd.SilenceErrors = true
+	cmd.DisableFlagParsing = true
+
+	cmd.AddCommand(newVersionCmd())
+	return cmd
+}

cmd/subcmd/cfn/version.go

@@ -0,0 +1,22 @@
+package cfn
+
+import (
+	"fmt"
+
+	ver "github.com/nao1215/rainbow/version"
+	"github.com/spf13/cobra"
+)
+
+// newVersionCmd return version command.
+func newVersionCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "version",
+		Short: fmt.Sprintf("Print %s version", commandName()),
+		Run:   version,
+	}
+}
+
+// version return s3hub command version.
+func version(cmd *cobra.Command, _ []string) {
+	cmd.Printf("%s %s (under MIT LICENSE)\n", commandName(), ver.GetVersion())
+}

cmd/subcmd/cfn/version_test.go

@@ -0,0 +1,30 @@
+package cfn
+
+import (
+	"bytes"
+	"testing"
+
+	ver "github.com/nao1215/rainbow/version"
+)
+
+func Test_version(t *testing.T) {
+	t.Run("Get version information", func(t *testing.T) {
+		cmd := newVersionCmd()
+		stdout := bytes.NewBufferString("")
+		cmd.SetOutput(stdout)
+
+		orgVersion := ver.Version
+		ver.Version = "v0.0.0"
+		t.Cleanup(func() {
+			ver.Version = orgVersion
+		})
+
+		cmd.Run(cmd, []string{})
+
+		want := "s3hub v0.0.0 (under MIT LICENSE)\n"
+		got := stdout.String()
+		if got != want {
+			t.Errorf("got %s, want %s", got, want)
+		}
+	})
+}