added completion command (#82)

cmd/completion.go

@@ -0,0 +1,91 @@
+/*
+Copyright © 2021 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 (
+	"go.uber.org/zap"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+// completionCmd represents the completion command
+var completionCmd = &cobra.Command{
+	Use:                   "completion [bash|zsh|fish|powershell]",
+	Short:                 "Generate completion script",
+	Long: `To load completions:
+
+Bash:
+
+$ source <(gebug completion bash)
+
+# To load completions for each session, execute once:
+Linux:
+  $ gebug completion bash > /etc/bash_completion.d/gebug
+MacOS:
+  $ gebug completion bash > /usr/local/etc/bash_completion.d/gebug
+
+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:
+$ gebug completion zsh > "${fpath[1]}/_gebug"
+
+# You will need to start a new shell for this setup to take effect.
+
+Fish:
+
+$ gebug completion fish | source
+
+# To load completions for each session, execute once:
+$ gebug completion fish > ~/.config/fish/completions/gebug.fish
+
+Powershell:
+
+PS> gebug completion powershell | Out-String | Invoke-Expression
+
+# To load completions for every new session, run:
+PS> gebug completion powershell > gebug.ps1
+# and source this file from your powershell profile.
+`,
+	DisableFlagsInUseLine: true,
+	ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
+	Args:                  cobra.ExactValidArgs(1),
+	Run: func(cmd *cobra.Command, args []string) {
+		var err error
+		switch args[0] {
+		case "bash":
+			err = cmd.Root().GenBashCompletion(os.Stdout)
+		case "zsh":
+			err = cmd.Root().GenZshCompletion(os.Stdout)
+		case "fish":
+			err = cmd.Root().GenFishCompletion(os.Stdout, true)
+		case "powershell":
+			err = cmd.Root().GenPowerShellCompletion(os.Stdout)
+		}
+		if err != nil {
+			zap.L().Error("Failed to generate completion", zap.String("shell", args[0]), zap.Error(err))
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(completionCmd)
+}