Added a command to import categories from a file

categories/management/commands/import_categories.py

@@ -0,0 +1,83 @@
+from django.core.management.base import BaseCommand, CommandError
+from categories.models import Category
+from django.template.defaultfilters import slugify
+
+class Command(BaseCommand):
+    """Import category trees from a file."""
+
+    help = "Imports category tree(s) from a file. Sub categories must be indented by the same multiple of spaces or tabs."
+    args = "file_path [file_path ...]"
+
+    def get_indent(self, string):
+        """
+        Look through the string and count the spaces
+        """
+        indent_amt = 0
+
+        if string[0] == '\t':
+            return '\t'
+        for char in string:
+            if char == ' ':
+                indent_amt += 1
+            else:
+                return ' ' * indent_amt
+
+
+    def make_category(self, string, parent=None, order=1):
+        """
+        Make and save a category object from a string
+        """
+        return Category.objects.create(
+            name=string.strip(),
+            slug=slugify(string.strip()),
+            parent=parent,
+            order=order
+        )
+
+    def parse_lines(self, lines):
+        """
+        Do the work of parsing each line
+        """
+        indent = ''
+        level = 0
+
+        if lines[0][0] == ' ' or lines[0][0] == '\t':
+            raise CommandError("The first line in the file cannot start with a space or tab.")
+
+        # This keeps track of the current parents at a given level
+        current_parents = {0: None}
+
+        for line in lines:
+            print line
+            if len(line) == 0:
+                continue
+            if line[0] == ' ' or line[0] == '\t':
+                if indent == '':
+                    indent = self.get_indent(line)
+                elif not line[0] in indent:
+                    raise CommandError("You can't mix spaces and tabs for indents")
+                level = line.count(indent)
+                current_parents[level] = self.make_category(line, parent=current_parents[level-1])
+                print current_parents
+            else:
+                # We are back to a zero level, so reset the whole thing
+                current_parents = {0: self.make_category(line)}
+                print current_parents
+        print Category.objects.all()
+
+    def handle(self, *file_paths, **options):
+        """
+        Handle the basic import
+        """
+        import os
+
+        for file_path in file_paths:
+            if not os.path.isfile(file_path):
+                print "File %s not found." % filename
+                continue
+            f = file(file_path, 'r')
+            data = f.readlines()
+            f.close()
+
+            self.parse_lines(data)
+