add completions

.goreleaser.yml

@@ -56,3 +56,12 @@ brews:
       - name: git
       - name: go-jsonnet
       - name: jsonnet-bundler
+
+    install: |
+      bin.install "kable"
+      output = Utils.popen_read("#{bin}/kable completion bash")
+      (bash_completion/"kable").write output
+      output = Utils.popen_read("#{bin}/kable completion zsh")
+      (zsh_completion/"_kable").write output
+      output = Utils.popen_read("#{bin}/kable completion fish")
+      (fish_completion/"kable.fish").write output

cmd/completion.go

@@ -0,0 +1,75 @@
+/*
+Copyright © 2020 NAME HERE <EMAIL ADDRESS>
+
+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 (
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+var completionCmd = &cobra.Command{
+	Use:   "completion [bash|zsh|fish|powershell]",
+	Short: "Generate completion scripts",
+	Long: `To load completions:
+
+Bash:
+
+$ source <(kable completion bash)
+
+# To load completions for each session, execute once:
+Linux:
+  $ kable completion bash > /etc/bash_completion.d/kable
+MacOS:
+  $ kable completion bash > /usr/local/etc/bash_completion.d/kable
+
+Zsh:
+
+# If shell completion is not already enabled in your environment you will need
+# to enable it.  You can execute the following once:
+
+$ echo "autoload -U compinit; compinit" >> ~/.zshrc
+
+# To load completions for each session, execute once:
+$ kable completion zsh > "${fpath[1]}/_kable"
+
+# You will need to start a new shell for this setup to take effect.
+
+Fish:
+
+$ kable completion fish | source
+
+# To load completions for each session, execute once:
+$ kable completion fish > ~/.config/fish/completions/kable.fish
+`,
+	DisableFlagsInUseLine: true,
+	ValidArgs:             []string{"bash", "zsh", "fish"},
+	Args:                  cobra.ExactValidArgs(1),
+	Run: func(cmd *cobra.Command, args []string) {
+		switch args[0] {
+		case "bash":
+			cmd.Root().GenBashCompletion(os.Stdout)
+		case "zsh":
+			cmd.Root().GenZshCompletion(os.Stdout)
+		case "fish":
+			cmd.Root().GenFishCompletion(os.Stdout, true)
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(completionCmd)
+}