Proposal: Mechanism for command plug-in.

Let's say that jarsearch.jar contains a Jnode-compatible command. When we add jarsearch.jar to our classpath, we must also add an alias to our alias list. And then, we can invoke the jarsearch command.

Here is a proposed mechanism for automatically adding a command alias. We add a resource to jarsearch.jar.

In a resource called META-INF/command/jarsearch.xml, we write:

<?xml version="1.0"?>
<command>
  <classname>org.gchii.demo.JarSearchCommand</classname>
  <helptext>
jarsearch command
  syntax: jarsearch [options] directory
  -package        - searches for a package by name
  -class          - searches for a class by name
  -R, --recursive - searches directory recursively
  directory       - starts search in a directory
  </helptext>
  <manual>
jarsearch command
Example
  jarsearch -class org.jnode.command.CdCommand .
  searches for
  </manual>
</command>

Thus, by adding jarsearch.jar to our classpath, we can invoke the jarsearch command. Also, the XML document might contains helpful information about the jarsearch command, display-able by a command such as help jarsearch and man jarsearch.