Tweaks to bin/manp to make it.. better?

bin/manp

@@ -7,37 +7,29 @@ http://benalman.com/
 Usage: $(basename "$0") [section] name
 
 View a manpage as PDF in the default viewer (Preview.app). Because sometimes
-you don't want to view manpages in the terminal. Tested in OS X 10.7.
+you don't want to view manpages in the terminal.
 
-Copyright (c) 2011 "Cowboy" Ben Alman
+Copyright (c) 2012 "Cowboy" Ben Alman
 Licensed under the MIT license.
 http://benalman.com/about/license/
 HELP
 exit; fi
 
 if [ ! "$1" ]; then
-  echo "What manual page do you want?!"
+  echo 'What manual page do you want?!'
   exit
 fi
 
 cache_dir=~/.dotfiles/caches/manpdf
 
-if [ "$2" ]; then
-  name="$2.$1"
-else
-  name="$1"
-fi
+# Figure out what the filename should be.
+file="$cache_dir/${2:+$2.}$1.pdf"
 
-file="$cache_dir/$name.pdf"
+# Create directory if it doesn't exist.
+[[ -e "$cache_dir" ]] || mkdir -p "$cache_dir"
 
-if [ ! -e "$cache_dir" ]; then
-  mkdir -p $cache_dir;
-fi
+# Create PDF if it doesn't exist.
+[[ -e "$file" ]] || man -t "$@" | pstopdf -i -o "$file" >/dev/null 2>&1
 
-if [ ! -e "$file" ]; then
-  man -t "$@" | pstopdf -i -o "$file" > /dev/null 2>&1
-fi
-
-if [ -e "$file" ]; then
-  open "$file"
-fi
+# Open PDF (if it does exist).
+[[ -e "$file" ]] && open "$file"