Rename gotk binary to flux

Signed-off-by: Hidde Beydals <hello@hidde.co>

cmd/flux/completion_zsh.go

@@ -0,0 +1,52 @@
+/*
+Copyright 2020 The Flux authors
+
+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 main
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+var completionZshCmd = &cobra.Command{
+	Use:   "zsh",
+	Short: "Generates zsh completion scripts",
+	Example: `To load completion run
+
+. <(flux completion zsh) && compdef _flux flux
+
+To configure your zsh shell to load completions for each session add to your zshrc
+
+# ~/.zshrc or ~/.profile
+command -v flux >/dev/null && . <(flux completion zsh) && compdef _flux flux
+
+or write a cached file in one of the completion directories in your ${fpath}:
+
+echo "${fpath// /\n}" | grep -i completion
+flux completions zsh > _flux
+
+mv _flux ~/.oh-my-zsh/completions  # oh-my-zsh
+mv _flux ~/.zprezto/modules/completion/external/src/  # zprezto
+`,
+	Run: func(cmd *cobra.Command, args []string) {
+		rootCmd.GenZshCompletion(os.Stdout)
+	},
+}
+
+func init() {
+	completionCmd.AddCommand(completionZshCmd)
+}