clojure_namespace_talk.clj

;; Namespaces, Symbols, and Vars (Oh, My!) -- @craigandera

;; require = "load"

;; dots => slashes, dash => underscore in require to file

(require '[net.cgrand.enlive-html :as html]) ...you can alias by passing the list elements as sequence.
;; * Single quoting above sequence the reading of the sequence as evaluating happens. 

(ns some.name)
;; #'some.name/foo => access var 
(def foo)

;; ------
;; refer allows you to add a link to another namespace in the current namespace.
(require '[net.cgrand.enlive-html :as html])
(ns some.where)
(refer 'net.cgrand.enlive-html)
(render ...) ;; This var is from the net.cgrand.enlive-html namespace

;; You can control what from the referred namespace, by using a sequence
(refer '[blah.whatever :only (foo bar)])
;; ------

;; "use" is require + refer

;; use in-in to switch namespaces
;; *ns* var refers to current namespace
;; namespaces by default, are empty. You need "refer" things in to your new namespace.

;; the ns macro auto refers clojure core and java.lang

(ns foo.bar
	(:refer-clojure :exclude [replace])
	(:require clojure.test)
	(:use [clojure.string :only (replace join)]
		  [clojure.repl :rename {dir ls}])
	(:import (java.util Date Timer Random)
			 java.sql.Connection))

(ns hello
	(:require [clojure.string :as str]))

(defn -main [& args]
	(println "hello" (str/join " and " args)))