add completion support

go.mod

@@ -7,9 +7,9 @@ require (
 	github.com/jsipprell/keyctl v0.0.0-20160328205232-988d05162bc5
 	github.com/magiconair/properties v1.8.0
 	github.com/mitchellh/go-homedir v1.1.0
-	github.com/spf13/cobra v0.0.4-0.20190321000552-67fc4837d267
-	github.com/spf13/viper v1.3.2
+	github.com/spf13/cobra v1.0.0
+	github.com/spf13/viper v1.4.0
 	github.com/stretchr/testify v1.3.0
 	golang.org/x/crypto v0.0.0-20190320223903-b7391e95e576
-	golang.org/x/net v0.0.0-20190322120337-addf6b3196f6
+	golang.org/x/net v0.0.0-20190522155817-f3200d17e092
 )

go.sum

@@ -1,71 +1,161 @@
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 golang.org/x/crypto v0.0.0-20190320223903-b7391e95e576/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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internal/cli/commands.go

@@ -19,6 +19,7 @@ func init() {
 	BgcCmd.AddCommand(commands.DeleteCmd(getBookingService))
 	BgcCmd.AddCommand(commands.ListCmd(getBookingService))
 	BgcCmd.AddCommand(commands.VersionCmd(ApplicationName, Version))
+	BgcCmd.AddCommand(commands.CompletionCmd)
 
 	loadFlags()
 

internal/cli/commands/completion.go

@@ -0,0 +1,58 @@
+package commands
+
+import (
+	"github.com/spf13/cobra"
+	"os"
+)
+
+var CompletionCmd = &cobra.Command{
+	Use:                   "completion [bash|zsh|fish|powershell]",
+	Short:                 "Generate completion script",
+	Long: `To load completions:
+
+Bash:
+
+$ source <(bgc completion bash)
+
+# To load completions for each session, execute once:
+Linux:
+  $ bgc completion bash > /etc/bash_completion.d/bgc
+MacOS:
+  $ bgc completion bash > /usr/local/etc/bash_completion.d/bgc
+
+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:
+$ bgc completion zsh > "${fpath[1]}/_bgc"
+
+# You will need to start a new shell for this setup to take effect.
+
+Fish:
+
+$ bgc completion fish | source
+
+# To load completions for each session, execute once:
+$ bgc completion fish > ~/.config/fish/completions/bgc.fish
+`,
+	DisableFlagsInUseLine: true,
+	Hidden: true,
+	ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
+	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)
+		case "powershell":
+			cmd.Root().GenPowerShellCompletion(os.Stdout)
+		}
+	},
+}