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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>
+
+;; 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
+
+(require 'stack-core)
+
+
+;;; Customizations
+
+(defconst stack-filter-cache-file
+  "filters.el")
+
+(defvar stack-filter
+  'default
+  "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'!")
+
+
+;;; Compilation
+
+;;; TODO allow BASE to be a precompiled filter name
+(defun stack-filter-compile (&optional include exclude base)
+  "Compile INCLUDE and EXCLUDE into a filter derived from BASE.
+
+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 response 0)))))))
+
+
+;;; Storage and Retrieval
+
+(defun stack-filter-get (filter)
+  "Retrieve named FILTER from `stack-filter-cache-file'."
+  (cdr (assoc filter (stack-cache-get stack-filter-cache-file))))
+
+(defun stack-filter-store (name &optional filter)
+  "Store NAME as FILTER in `stack-filter-cache-file'.
+
+NAME should be a symbol and FILTER is a string as compiled by
+`stack-filter-compile'.
+
+If NAME is a cons cell, (car NAME) is taken to be the actual NAME
+and (cdr NAME) is taken to be the actual FILTER.  In this case,
+the second argument is simply ignored."
+  (let ((name   (if (consp name) (car name) name))
+        (filter (if (consp name) (cdr name) filter)))
+    (unless (symbolp name)
+      (error "Name must be a symbol: %S" name))
+    (let* ((dict (stack-cache-get stack-filter-cache-file))
+           (entry (assoc name dict)))
+      (if entry (setcdr entry filter)
+        (setq dict (cons (cons name filter) dict)))
+
+      (stack-cache-set stack-filter-cache-file dict))))
+
+(defun stack-filter-store-all (name-filter-alist)
+  (mapc #'stack-filter-store name-filter-alist))
+
+(provide 'stack-filter)
+;;; stack-filter.el ends here