Fixed #589 -- Added FilePathField. It's available as an ORM field and as a standalone field in django.core.formfields. Thanks, jay@skabber.com

git-svn-id: http://code.djangoproject.com/svn/django/trunk@846 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/db/backends/mysql.py

@@ -143,6 +143,7 @@ DATA_TYPES = {
     'DateTimeField':     'datetime',
     'EmailField':        'varchar(75)',
     'FileField':         'varchar(100)',
+    'FilePathField':     'varchar(100)',
     'FloatField':        'numeric(%(max_digits)s, %(decimal_places)s)',
     'ImageField':        'varchar(100)',
     'IntegerField':      'integer',

django/core/db/backends/postgresql.py

@@ -154,6 +154,7 @@ DATA_TYPES = {
     'DateTimeField':     'timestamp with time zone',
     'EmailField':        'varchar(75)',
     'FileField':         'varchar(100)',
+    'FilePathField':     'varchar(100)',
     'FloatField':        'numeric(%(max_digits)s, %(decimal_places)s)',
     'ImageField':        'varchar(100)',
     'IntegerField':      'integer',

django/core/db/backends/sqlite3.py

@@ -154,6 +154,7 @@ DATA_TYPES = {
     'DateTimeField':                'datetime',
     'EmailField':                   'varchar(75)',
     'FileField':                    'varchar(100)',
+    'FilePathField':                'varchar(100)',
     'FloatField':                   'numeric(%(max_digits)s, %(decimal_places)s)',
     'ImageField':                   'varchar(100)',
     'IntegerField':                 'integer',

django/core/formfields.py

@@ -707,6 +707,29 @@ class IPAddressField(TextField):
 # MISCELLANEOUS    #
 ####################
 
+class FilePathField(SelectField):
+    "A SelectField whose choices are the files in a given directory."
+    def __init__(self, field_name, path, match=None, recursive=False, is_required=False, validator_list=[]):
+        import os
+        if match is not None:
+            import re
+            match_re = re.compile(match)
+        choices = []
+        if recursive:
+            for root, dirs, files in os.walk(path):
+                for f in files:
+                    if match is None or match_re.search(f):
+                        choices.append((os.path.join(path, f), f))
+        else:
+            try:
+                for f in os.listdir(path):
+                    full_file = os.path.join(path, f)
+                    if os.path.isfile(full_file) and (match is None or match_re.search(f)):
+                        choices.append((full_file, f))
+            except OSError:
+                pass
+        SelectField.__init__(self, field_name, choices, 1, is_required, validator_list)
+
 class PhoneNumberField(TextField):
     "A convenience FormField for validating phone numbers (e.g. '630-555-1234')"
     def __init__(self, field_name, is_required=False, validator_list=[]):

django/core/meta/fields.py

@@ -427,6 +427,14 @@ class FileField(Field):
         f = os.path.join(self.get_directory_name(), get_valid_filename(os.path.basename(filename)))
         return os.path.normpath(f)
 
+class FilePathField(Field):
+    def __init__(self, verbose_name=None, name=None, path='', match=None, recursive=False, **kwargs):
+        self.path, self.match, self.recursive = path, match, recursive
+        Field.__init__(self, verbose_name, name, **kwargs)
+
+    def get_manipulator_field_objs(self):
+        return [curry(formfields.FilePathField, path=self.path, match=self.match, recursive=self.recursive)]
+
 class FloatField(Field):
     empty_strings_allowed = False
     def __init__(self, verbose_name=None, name=None, max_digits=None, decimal_places=None, **kwargs):

docs/model-api.txt

@@ -272,6 +272,40 @@ Here are all available field types:
 
     .. _`strftime formatting`: http://docs.python.org/lib/module-time.html#l2h-1941
 
+``FilePathField``
+    A field whose choices are limited to the filenames in a certain directory
+    on the filesystem. Has three special arguments, of which the first is
+    required:
+
+        ======================  ===================================================
+        Argument                Description
+        ======================  ===================================================
+        ``path``                Required. The absolute filesystem path to a
+                                directory from which this ``FilePathField`` should
+                                get its choices. Example: ``"/home/images"``.
+
+        ``match``               Optional. A regular expression, as a string, that
+                                ``FilePathField`` will use to filter filenames.
+                                Note that the regex will be applied to the
+                                base filename, not the full path. Example:
+                                ``"foo.*\.txt^"``, which will match a file called
+                                ``foo23.txt`` but not ``bar.txt`` or ``foo23.gif``.
+
+        ``recursive``           Optional. Either ``True`` or ``False``. Default is
+                                ``False``. Specifies whether all subdirectories of
+                                ``path`` should be included.
+
+    Of course, these arguments can be used together.
+
+    The one potential gotcha is that ``match`` applies to the base filename,
+    not the full path. So, this example::
+
+        FilePathField(path="/home/images", match="foo.*", recursive=True)
+
+    ...will match ``/home/images/foo.gif`` but not ``/home/images/foo/bar.gif``
+    because the ``match`` applies to the base filename (``foo.gif`` and
+    ``bar.gif``).
+
 ``FloatField``
     A floating-point number. Has two **required** arguments: