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+;;; stack-filter.el --- filters for stack-mode       -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2014  Sean Allred
+
+;; Author: Sean Allred <code@seanallred.com>
+;; Keywords: help, hypermedia, mail, news, tools
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; 
+
+;;; Code:
+
+
+;;; Dependencies
+
+(if (boundp 'production)
+    (require 'stack-core)
+  (setq load-path (cons "." load-path))
+  (load "stack-core.el"))
+
+
+;;; Customizations
+
+(defcustom stack-core-filter
+  (stack-core-compile-filter
+   nil					;don't include anything extra
+   '(user.profile_image			;don't include pictures (yet)
+     shallow_user.profile_image)	;
+   'withbody)				;we want the body!
+  "The current filter.  To customize the filter for the next call
+to `stack-core-make-request', let-bind this variable to the
+output of a call to `stack-core-compile-filter'.  Be careful!  If
+you're going to be using this new filter a lot, create a variable
+for it.  Creation requests count against
+`stack-core-remaining-api-requests'!")
+
+
+;;; Filter compilation
+
+(defun stack-core-compile-filter (&optional include exclude base)
+  "Compile a StackExchange filter including fields from INCLUDE,
+excluding those from EXCLUDE, using BASE as a base filter.
+
+INCLUDE and EXCLUDE must both be lists; BASE should be a symbol
+or string."
+  (let ((keyword-arguments
+	 `((include . ,(if include (mapconcat
+				    #'stack-core-thing-as-string
+				    include ";")))
+	   (exclude . ,(if exclude (mapconcat
+				    #'stack-core-thing-as-string
+				    exclude ";")))
+	   (base    . ,(if base base)))))
+    (let ((response (stack-core-make-request "filter/create" keyword-arguments)))
+      (url-hexify-string
+       (cdr (assoc 'filter (elt (cdr (assoc 'items response)) 0)))))))
+
+(provide 'stack-filter)
+;;; stack-filter.el ends here