Adding EXERCISES.md to match hbase shell exercises from HBase book

(Stack proposal). Also begin implementing 'create' command.

CTRL-D is now handled properly, hope so.

EXERCISES.md

@@ -0,0 +1,11 @@
+# Shell Exercises
+
+This article is inspired from [HBase Book Exercises](http://hbase.apache.org/book/quickstart.html#shell_exercises).
+
+Connect to your running HBase via **hubris**.
+
+    $ ./bin/hubris
+    Hbase UBer Interactive Shell; enter 'help<RETURN>' to see available commands or 'exit<RETURN>' to quit.
+    hubris>
+
+Type **help**

bin/hubris

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-VERSION="0.1.0"
+VERSION="0.2.0"
 
 # content location
 program=`basename $0`

project.clj

@@ -1,4 +1,4 @@
-(defproject hubris "0.1.0"
+(defproject hubris "0.2.0"
   :description "Hubris - HBase uber shell"
   :license "EPL 1.0"
   :url "http://github.com/sanel/hubris"

src/hubris/builtin.clj

@@ -56,9 +56,9 @@ Examples:
   hubris> connect                  ;; connect to localhost
   hubris> connect \"foo\"          ;; connect to 'foo' host and the same zookeeper address
   hubris> connect \"foo\" \"baz\"  ;; connect to 'foo' host with 'baz' as zookeeper address"
-     ([]     (connect "localhost"))
-     ([host] (connect host host))
-     ([host zk] (hbase.core/connect-to host zk))
+    ([]     (connect "localhost"))
+    ([host] (connect host host))
+    ([host zk] (hbase.core/connect-to host zk))
   )
 
   (defcommand host
@@ -70,6 +70,20 @@ Examples:
         (println "Not connected to any HBase instance")
   ) ) )
 
+  (defcommand create
+    "Create table; pass table name, a dictionary of specifications per column family, and optionally
+a dictionary of table configuration. Dictionaries are described below in the GENERAL NOTES section.
+
+Examples:
+
+  hbase> create \"t1\" {:NAME \"f1\" :VERSIONS 5}
+  hbase> create \"t1\" [{:NAME \"f1\"} {:NAME \"f2\"} {:NAME \"f3\"}]
+  hbase> ;; The above in shorthand would be the following:
+  hbase> create \"t1\" \"f1\" \"f2\" \"f3\"
+  hbase> create \"t1\" {:NAME \"f1\" :VERSIONS 1 :TTL 2592000 :BLOCKCACHE true}"
+   [table opts]
+   (println "TODO"))
+
   (defcommand list-tables
     "List all tables in hbase"
     []

src/hubris/repl.clj

@@ -38,6 +38,11 @@
 (defn evaluate-with-redirection
   "Scan expression for possible redirection(s), and if found, bind output to it. If not, proceed as usual."
   [expr]
+  ;; Try to catch CTRL-D input; normaly, REPL would quit with CTRL-C, but CTRL-D combo would force nil input
+  ;; causing further functions to throw null exception. I'm hoping this 'hack' would not cause other troubles...
+  (when-not expr
+    (System/exit 0))
+
   (if (re-find #"\s+>\s+" expr)
     (do
       (let [tokens (.split expr "\\s+>\\s+")