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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
(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'."
(with-current-buffer (stack-cache-get-file stack-filter-cache-file)
(or (cdr (ignore-errors (assoc filter (read (buffer-string)))))
nil)))
(defun stack-filter-store (name 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'."
(unless (symbolp name)
(error "Name must be a symbol: %S" name))
(with-current-buffer (stack-cache-get-file stack-filter-cache-file)
(let* ((dict (or (ignore-errors
(read (buffer-string)))
nil))
(entry (assoc name dict)))
(if entry (setf (cdr entry) filter)
(setq dict (cons (cons name filter) dict)))
(erase-buffer)
(insert (prin1-to-string dict))
(save-buffer)
dict)))
;;; TODO tail recursion should be made more efficient for the
;;; byte-compiler
(defun stack-filter-store-all (name-filter-alist)
(when name-filter-alist
(stack-filter-store
(caar name-filter-alist)
(cdar name-filter-alist))
(stack-filter-store-all (cdr name-filter-alist))))
(provide 'stack-filter)
;;; stack-filter.el ends here
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