add ns-utils.clj and update example code in sql.clj to be more robust about loading the driver class

2 files changed, 90 insertions, 2 deletions

diff --git a/ns-utils.clj b/ns-utils.clj
new file mode 100644
index 00000000..ca2395e7
--- /dev/null
+++ b/ns-utils.clj
@@ -0,0 +1,88 @@
+;;  Copyright (c) Stephen C. Gilardi. All rights reserved.
+;;  The use and distribution terms for this software are covered by the
+;;  Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
+;;  which can be found in the file CPL.TXT at the root of this distribution.
+;;  By using this software in any fashion, you are agreeing to be bound by
+;;  the terms of this license.
+;;  You must not remove this notice, or any other, from this software.
+;;
+;;  ns-utils.clj
+;;
+;;  Namespace Utilities
+;;
+;;    'ns'              returns the namespace named by a symbol or throws
+;;                      if the namespace does not exist
+;;
+;;    'ns-vars'         returns a sorted seq of symbols naming public vars
+;;                      in a namespace
+;;
+;;    'print-dir'       prints a sorted directory of public vars in a
+;;                      namespace
+;;
+;;    'print-docs'      prints documentation for the public vars in a
+;;                      namespace
+;;
+;;  Convenience
+;;
+;;    'vars'            returns a sorted seq of symbols naming public vars
+;;                      in a namespace (macro)
+;;
+;;    'dir'             prints a sorted directory of public vars in a
+;;                      namespace (macro)
+;;
+;;    'docs'            prints documentation for the public vars in a
+;;                      namespace (macro)
+;;
+;;  scgilardi (gmail)
+;;  23 April 2008
+
+(clojure/in-ns 'ns-utils)
+(clojure/refer 'clojure)
+
+;; Namespace Utilities
+
+(defn ns
+  "Returns the namespace named by ns-sym or throws if the
+  namespace does not exist"
+  [ns-sym]
+  (let [ns (find-ns ns-sym)]
+    (when-not ns
+      (throw (new Exception (str "Unable to find namespace: "
+                                 ns-sym))))
+    ns))
+
+(defn ns-vars
+  "Returns a sorted seq of symbols naming public vars in
+  a namespace"
+  [ns]
+  (sort (map first (ns-publics ns))))
+
+(defn print-dir
+  "Prints a sorted directory of public vars in a namespace"
+  [ns]
+  (doseq item (ns-vars ns)
+    (println item)))
+
+(defn print-docs
+  "Prints documentation for the public vars in a namespace"
+  [ns]
+  (doseq item (ns-vars ns)
+    (print-doc (ns-resolve ns item))))
+
+;; Convenience
+
+(defmacro vars
+  "Returns a sorted seq of symbols naming public vars in
+  a namespace"
+  [nsname]
+  `(ns-vars (ns '~nsname)))
+
+(defmacro dir
+  "Prints a sorted directory of public vars in a namespace"
+  [nsname]
+  `(print-dir (ns '~nsname)))
+
+(defmacro docs
+  "Prints documentation for the public vars in a namespace"
+  [nsname]
+  `(print-docs (ns '~nsname)))
diff --git a/sql.clj b/sql.clj
index efce6a0a..f9808abc 100644
--- a/sql.clj
+++ b/sql.clj
@@ -11,7 +11,7 @@
 ;;  A Clojure interface to sql databases via jdbc
 ;;
 ;;  scgilardi (gmail)
-;;  2 April 2008
+;;  23 April 2008
 
 (clojure/in-ns 'sql)
 (clojure/refer 'clojure)
@@ -79,7 +79,7 @@
 
  (require 'sql)
 
- (class org.sqlite.JDBC)
+ (. Class (forName "org.sqlite.JDBC"))
 
  (defn db []
    (get-connection "sqlite" "test.db"))