Overhauled CLI. #180

[zzz-pokedex.git] / pokedex / db / load.py

diff --git a/pokedex/db/load.py b/pokedex/db/load.py
index 2b14883..0425dea 100644 (file)
--- a/pokedex/db/load.py
+++ b/pokedex/db/load.py
@@ -1,15 +1,49 @@
 """CSV to database or vice versa."""
 import csv
+import os.path
 import pkg_resources
+import re
 import sys
 
 from sqlalchemy.orm.attributes import instrumentation_registry
+import sqlalchemy.sql.util
 import sqlalchemy.types
 
 from pokedex.db import metadata
 import pokedex.db.tables as tables
 
 
+def _wildcard_char_to_regex(char):
+    """Converts a single wildcard character to the regex equivalent."""
+
+    if char == '?':
+        return '.?'
+    elif char == '*':
+        return '.*'
+    else:
+        return re.escape(char)
+
+def _wildcard_glob_to_regex(glob):
+    """Converts a single wildcard glob to a regex STRING."""
+
+    # If it looks like a filename, make it not one
+    if '.' in glob or '/' in glob:
+        _, filename = os.path.split(glob)
+        table_name, _ = os.path.splitext(filename)
+        glob = table_name
+
+    return u''.join(map(_wildcard_char_to_regex, glob))
+
+def _wildcards_to_regex(strings):
+    """Converts a list of wildcard globs to a single regex object."""
+
+    regex_parts = map(_wildcard_glob_to_regex, strings)
+
+    regex = '^(?:' + '|'.join(regex_parts) + ')$'
+
+    return re.compile(regex)
+
+
 def _get_verbose_prints(verbose):
     """If `verbose` is true, returns two functions: one for printing a starting
     message, and the other for printing a success or failure message when
@@ -44,7 +78,7 @@ def _get_verbose_prints(verbose):
     return dummy, dummy
 
 
-def load(session, directory=None, drop_tables=False, verbose=False):
+def load(session, tables=[], directory=None, drop_tables=False, verbose=False):
     """Load data from CSV files into the given database session.
 
     Tables are created automatically.
@@ -52,6 +86,9 @@ def load(session, directory=None, drop_tables=False, verbose=False):
     `session`
         SQLAlchemy session to use.
 
+    `tables`
+        List of tables to load.  If omitted, all tables are loaded.
+
     `directory`
         Directory the CSV files reside in.  Defaults to the `pokedex` data
         directory.
@@ -70,17 +107,29 @@ def load(session, directory=None, drop_tables=False, verbose=False):
     if not directory:
         directory = pkg_resources.resource_filename('pokedex', 'data/csv')
 
+    if tables:
+        regex = _wildcards_to_regex(tables)
+        table_names = filter(regex.match, metadata.tables.keys())
+    else:
+        table_names = metadata.tables.keys()
+
+    table_objs = [metadata.tables[name] for name in table_names]
+    table_objs = sqlalchemy.sql.util.sort_tables(table_objs)
+
+
     # Drop all tables if requested
     if drop_tables:
         print_start('Dropping tables')
-        metadata.drop_all()
+        for table in reversed(table_objs):
+            table.drop(checkfirst=True)
         print_done()
 
-    metadata.create_all()
+    for table in table_objs:
+        table.create()
     connection = session.connection()
 
     # Okay, run through the tables and actually load the data now
-    for table_obj in metadata.sorted_tables:
+    for table_obj in table_objs:
         table_name = table_obj.name
         insert_stmt = table_obj.insert()
 
@@ -163,7 +212,7 @@ def load(session, directory=None, drop_tables=False, verbose=False):
 
             # Remembering some zillion rows in the session consumes a lot of
             # RAM.  Let's not do that.  Commit every 1000 rows
-            if len(new_rows) > 1000:
+            if len(new_rows) >= 1000:
                 insert_and_commit()
 
         insert_and_commit()
@@ -186,13 +235,16 @@ def load(session, directory=None, drop_tables=False, verbose=False):
 
 
 
-def dump(session, directory=None, verbose=False):
+def dump(session, tables=[], directory=None, verbose=False):
     """Dumps the contents of a database to a set of CSV files.  Probably not
     useful to anyone besides a developer.
 
     `session`
         SQLAlchemy session to use.
 
+    `tables`
+        List of tables to dump.  If omitted, all tables are dumped.
+
     `directory`
         Directory the CSV files should be put in.  Defaults to the `pokedex`
         data directory.
@@ -208,7 +260,16 @@ def dump(session, directory=None, verbose=False):
     if not directory:
         directory = pkg_resources.resource_filename('pokedex', 'data/csv')
 
-    for table_name in sorted(metadata.tables.keys()):
+    if tables:
+        regex = _wildcards_to_regex(tables)
+        table_names = filter(regex.match, metadata.tables.keys())
+    else:
+        table_names = metadata.tables.keys()
+
+    table_names.sort()
+
+
+    for table_name in table_names:
         print_start(table_name)
         table = metadata.tables[table_name]