Accept alternate install paths via ZSH variable

Uses environment variable $ZSH to configure install location.

README.textile

@@ -20,8 +20,14 @@ h4. via `wget`
 
 @wget --no-check-certificate https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh -O - | sh@
 
-h3. The manual way
+h4. Install location
 
+You can change the install destination via the ZSH environment variable. The default location is `~/.oh-my-zsh`:
+
+@...install.sh | ZSH=~/.dotfiles sh@
+
+
+h3. The manual way
 
 1. Clone the repository
 

tools/install.sh

@@ -1,11 +1,18 @@
-if [ -d ~/.oh-my-zsh ]
+set -e
+
+if [ ! -n $ZSH ]
 then
-  echo "\033[0;33mYou already have Oh My Zsh installed.\033[0m You'll need to remove ~/.oh-my-zsh if you want to install"
+  ZSH=~/.oh-my-zsh
+fi
+
+if [ -d $ZSH ]
+then
+  echo "\033[0;33mYou already have Oh My Zsh installed.\033[0m You'll need to remove $ZSH if you want to install"
   exit
 fi
 
 echo "\033[0;34mCloning Oh My Zsh...\033[0m"
-hash git >/dev/null && /usr/bin/env git clone https://github.com/robbyrussell/oh-my-zsh.git ~/.oh-my-zsh || {
+hash git >/dev/null && /usr/bin/env git clone https://github.com/robbyrussell/oh-my-zsh.git $ZSH || {
   echo "git not installed"
   exit
 }
@@ -18,7 +25,10 @@ then
 fi
 
 echo "\033[0;34mUsing the Oh My Zsh template file and adding it to ~/.zshrc\033[0m"
-cp ~/.oh-my-zsh/templates/zshrc.zsh-template ~/.zshrc
+cp $ZSH/templates/zshrc.zsh-template ~/.zshrc
+sed -i -e "/^ZSH=/ c\\
+ZSH=$ZSH
+" ~/.zshrc
 
 echo "\033[0;34mCopying your current PATH and adding it to the end of ~/.zshrc for you.\033[0m"
 echo "export PATH=\$PATH:$PATH" >> ~/.zshrc