update newbox script to work on rpm systems

newbox

@@ -5,28 +5,30 @@ fail() {
   exit 1
 }
 
-if ! which zsh >/dev/null 2>&1; then
+install() {
+
+  # apt (debian / ubuntu)
   if which aptitude >/dev/null 2>&1; then
-        sudo aptitude install -y zsh
+    sudo aptitude install -y "$@"
+
+  # homebrew (os x)
   elif which brew >/dev/null 2>&1; then
-        brew install zsh
+    brew install "$@"
+
+  # rpm (redhat / centos / fedora)
+  elif which yum >/dev/null 2>&1; then
+    sudo yum install -y "$@"
+
   else
-        fail "Don't know how to install zsh on this box. Install zsh and run this again."
-    fi
+    fail "Don't know how to install $@ on this box. Install $@ and run this again."
   fi
 
-if ! which git >/dev/null 2>&1; then
-    if which aptitude >/dev/null 2>&1; then
-        sudo aptitude install -y git-core
-    elif which brew >/dev/null 2>&1; then
-        brew install git-core
-    else
-        fail "Don't know how to install git on this box. Install git and run this again."
-    fi
-fi
+}
+
+install zsh git
 
 cd ~
-if ! [ -d config ]; then
+if ! [[ -d config ]]; then
   git clone git://github.com/samsonjs/config || fail "cannot clone config repo"
 fi