add version command

Author: chriskim06

.goreleaser.yml

@@ -10,6 +10,8 @@ builds:
   - darwin
   goarch:
   - amd64
+  ldflags:
+  - -s -w -X github.com/chriskim06/kubectl-topui/internal/cmd.tag={{.Version}}
 archives:
 - builds:
   - kubectl-topui

Makefile

@@ -1,5 +1,5 @@
 build:
-	go build -o out/kubectl-topui
+	go build -ldflags "-s -w -X github.com/chriskim06/kubectl-topui/internal/cmd.tag=DEV" -o out/kubectl-topui
 
 clean:
 	rm -r out

internal/cmd/util.go

@@ -29,7 +29,6 @@ Keyboard Shortcuts:
   - q: quit
   - j: scroll down
   - k: scroll up
-  - ?: display help modal
   - enter: view spec for selected item`
 )
 

internal/cmd/version.go

@@ -0,0 +1,40 @@
+/*
+Copyright © 2020 Chris Kim
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	// set by goreleaser via ldflags
+	tag string
+
+	versionCmd = &cobra.Command{
+		Use:   "version",
+		Short: "Show topui version",
+		RunE: func(_ *cobra.Command, args []string) error {
+			fmt.Printf("v%s\n", tag)
+			return nil
+		},
+	}
+)
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+}