Allow http://localhost:$port to be opened in the default browser using either...

Allow http://localhost:$port to be opened in the default browser using either the port number for common ports or `lh` for an arbitrary port.

plugins/localhost/localhost.load

 # Opens http://localhost:3000 (and other ports) in the default browser
-# Requires `open` to be installed (MacOS only)
-
-# Example:
+#
+# Usage:
+#
+# open a commonly used port with just the port number
 # $ 3000
+#
+# open an arbitrary port using the `lh` command
+# $ lh 3001
 
 ## Functions
 function _open-installed
   which open >/dev/null ^&1
 end
 
-function _open_browser
+## Main program
+function lh
   if _open-installed
+    if [ (count $argv) -lt 1 ]
+        echo "You need to specify a port to open"
+        return 1
+    end
     command open http://localhost:$argv
   else
-    echo 'Requires open to be installed'
+    echo 'Requires open (MacOS only) to be installed'
   end
 end
 
-## Main program
-set -l localhost_ports 3000 4000 5000 6000 7000 8000 9000 8080
+set -l common_localhost_ports 3000 4000 5000 6000 7000 8000 9000 8080
 
-for port in $localhost_ports
-  eval "function $port; _open_browser $port; end"
+for port in $common_localhost_ports
+  eval "function $port; lh $port; end"
 end