Zsh completion for docker-compose

Signed-off-by: Steve Durrheimer <s.durrheimer@gmail.com>

docs/completion.md

@@ -3,23 +3,44 @@ layout: default
 title: Command Completion
 ---
 
-#Command Completion
+# Command Completion
 
 Compose comes with [command completion](http://en.wikipedia.org/wiki/Command-line_completion)
-for the bash shell.
+for the bash and zsh shell.
 
-##Installing Command Completion
+## Installing Command Completion
+
+### Bash
 
 Make sure bash completion is installed. If you use a current Linux in a non-minimal installation, bash completion should be available.
 On a Mac, install with `brew install bash-completion`
- 
-Place the completion script in `/etc/bash_completion.d/` (`/usr/local/etc/bash_completion.d/` on a Mac), using e.g. 
 
-     curl -L https://raw.githubusercontent.com/docker/compose/1.2.0/contrib/completion/bash/docker-compose > /etc/bash_completion.d/docker-compose
- 
+Place the completion script in `/etc/bash_completion.d/` (`/usr/local/etc/bash_completion.d/` on a Mac), using e.g.
+
+     curl -L https://raw.githubusercontent.com/docker/compose/$(docker-compose --version | awk '{print $2}')/contrib/completion/bash/docker-compose > /etc/bash_completion.d/docker-compose
+
 Completion will be available upon next login.
 
-##Available completions
+### Zsh
+
+Place the completion script in your `/path/to/zsh/completion`, using e.g. `~/.zsh/completion/`
+
+    mkdir -p ~/.zsh/completion
+    curl -L https://raw.githubusercontent.com/docker/compose/$(docker-compose --version | awk '{print $2}')/contrib/completion/zsh/_docker-compose > ~/.zsh/completion/_docker-compose
+
+Include the directory in your `$fpath`, e.g. by adding in `~/.zshrc`
+
+    fpath=(~/.zsh/completion $fpath)
+
+Make sure `compinit` is loaded or do it by adding in `~/.zshrc`
+
+    autoload -Uz compinit && compinit -i
+
+Then reload your shell
+
+    exec $SHELL -l
+
+## Available completions
 
 Depending on what you typed on the command line so far, it will complete