--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pydbkit/tools/listdepends.py	Wed Jul 09 18:03:54 2014 +0200
@@ -0,0 +1,31 @@
+from pydbkit.toolbase import SimpleTool
+from pydbkit import pgbrowser
+
+
+class ListDependsTool(SimpleTool):
+
+    """
+    List column dependencies.
+
+    """
+
+    def __init__(self):
+        SimpleTool.__init__(self, name='listdepends')
+
+    def specify_args(self):
+        SimpleTool.specify_args(self)
+        self.parser.add_argument('table', metavar='table', type=str, help='Table name.')
+        self.parser.add_argument('column', metavar='column', type=str, help='Column name.')
+        self.parser.add_argument('-s', '--schema', dest='schema', metavar='schema',
+            type=str, default='public', help='Schema name (default=public).')
+
+    def main(self):
+        browser = pgbrowser.PgBrowser(self.pgm.get_conn('target'))
+
+        objects = browser.list_column_usage(self.args.table, self.args.column, schema=self.args.schema)
+        for obj in sorted(objects, key=lambda x: (x['type'], x['schema'], x['name'])):
+            print(obj['type'], ' ', obj['schema'], '.', obj['name'], sep='')
+
+
+cls = ListDependsTool
+