Plac mirror update to Plac 0.7.4.

doc/sql_interface.py

@@ -0,0 +1,28 @@
+import os, plac
+from sqlalchemy.ext.sqlsoup import SqlSoup
+
+SQLKEYWORDS = set(['select', 'from', 'inner', 'join', 'outer', 'left', 'right']
+                  ) # and many others
+DBTABLES = set(['table1', 'table2']) # you can read them from the db schema
+
+COMPLETIONS = SQLKEYWORDS | DBTABLES
+
+class SqlInterface(object):
+    commands = ['SELECT']
+    def __init__(self, dsn):
+        self.soup = SqlSoup(dsn)
+    def SELECT(self, argstring):
+        sql = 'SELECT ' + argstring
+        for row in self.soup.bind.execute(sql):
+            yield str(row) # the formatting can be much improved
+
+rl_input = plac.ReadlineInput(
+    COMPLETIONS, histfile=os.path.expanduser('~/.sql_interface.history'), 
+    case_sensitive=False)
+
+def split_on_first_space(line, commentchar):
+    return line.strip().split(' ', 1) # ignoring comments
+    
+if __name__ == '__main__':
+    plac.Interpreter.call(SqlInterface, split=split_on_first_space,
+                          stdin=rl_input, prompt='sql> ')