zsh: handle path building better

zshenv

@@ -10,18 +10,20 @@ export RUST_SRC_PATH=$HOME/Dropbox/lib/rust/src
 export GOPATH=$HOME/Dropbox/work/go
 export ANDROID_HOME=/usr/local/opt/android-sdk
 export ANDROID_SDK=/usr/local/Cellar/android-sdk/24.2
+export RUBYOPT=rubygems
 
-# Set the list of directories that Zsh searches for programs.
+# OSX Only
+if [[ -x /usr/libexec/path_helper ]]; then
+    eval $(/usr/libexec/path_helper -s)
+fi
 path=(
     $DOTFILES/{bin,scripts}
     $HOME/.{rb,py}env/bin
+    $HOME/bin
     $GOPATH/bin
     $ANDROID_HOME/platform-tools
     $ANDROID_HOME/tools
     /Library/TeX/texbin
-  /usr/local/{bin,sbin}
-  /usr/{bin,sbin}
-  /{bin,sbin}
     $path
 )
 
@@ -35,11 +37,11 @@ fpath=(
 # Browser
 export BROWSER='open'
 
-## Editors
+# Editors
 export EDITOR=$(is-callable nvim && echo 'nvim' || echo 'vim')
 export VISUAL=$EDITOR
 export PAGER='less'
-export RUBYOPT=rubygems
+
 # export CC=/usr/bin/clang
 # export CXX=/usr/bin/clang++
 # export CXXFLAGS="-I/usr/local/include"
@@ -49,7 +51,7 @@ export LIBRARY_PATH="/usr/local/lib"
 # export LDFLAGS="-L/usr/local/lib"
 
 export LESS='-F -g -i -M -R -S -w -z-4'
-if (( $+commands[lesspipe] )); then
+if is-callable lesspipe; then
   export LESSOPEN='| /usr/bin/env lesspipe %s 2>&-'
 fi