darwin/zsh: Add alias for ‘container’HEADmaster

1 files changed, 4 insertions, 0 deletions

diff --git a/zsh/env b/zsh/env
index e1b1fbf..78fe964 100644
--- a/zsh/env
+++ b/zsh/env
@@ -1,5 +1,9 @@
 # -*- mode: shell-script -*-
 
+command_exists() {
+  return $(( !(${+commands[$1]} == 1) ))
+}
+
 dotfiles_root() {
   echo ${${(%):-%x}:A:h:h}
 }