If there's a better place to ask this kind of question, please point me in
the right direction!
I'm learning Clojure, and part of the project I'm making is a command
language: the user can type commands at the application in something like a
REPL, and have a dialog with the application. I want to dispatch to a
function that carries out the command based on the first word of the
command; the function then receives the remaining words in the command, and
can do with them what it likes. So I'm going to need a map, something like
{ "dothis" #'commands/dothis, "dothat" #'commands/dothat ...}
The question is, how best to build up that map? I'd like to define a
command like this:
(command "dothis"
"Documentation string"
[argv]
....)
and have (command) define the function and add the entry to the map.
I can think of all kinds of ways to do this. I could define
(def command-map {})
and then have (command) rebind it:
...
(def command-map (assoc command-map name function))
but I know that's frowned upon. I could make command-map contain an atom,
and use (swap!) to update the atom, but really, the mapping isn't going to
change at run-time. I could make (command) a macro, so that it's really
updating command-map at the top-level, but that seems cheesy.
Or, I could make (command) define the function as a public function in the
'commands namespace, which would be reserved for that purpose, and attach
the command name, e.g., "dothis" to the function as metadata. Then I could
build the map by querying the namespace using (ns-publics).
Is there is a normal way to do this kind of thing?
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