89 lines
3.0 KiB
EmacsLisp
89 lines
3.0 KiB
EmacsLisp
;;; magithub-cache.el --- caching network data -*- lexical-binding: t; -*-
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;; Copyright (C) 2016 Sean Allred
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;; Author: Sean Allred <code@seanallred.com>
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;; Keywords: data, tools
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;;; Code:
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(require 'magithub-core)
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(defvar magithub-cache--cache ()
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"An alist of hash tables to use as thr cache.
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Entries are of the form (time-entered . value).")
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(defvar magithub-cache-refresh-seconds-plist
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(list :issues 600 :ci-status 60 t 60)
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"The number of seconds that have to pass for GitHub data to be
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considered outdated.")
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(defun magithub-cache--get-table (repo)
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(declare (indent defun))
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(let ((table (cdr (assoc repo magithub-cache--cache))))
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(unless table
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(add-to-list 'magithub-cache--cache (cons repo (make-hash-table)))
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(setq table (cdr (assoc repo magithub-cache--cache))))
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table))
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(defun magithub-cache--table (table cache default)
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"The cached value for CACHE (set to DEFAULT if necessary)."
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(declare (indent defun))
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(let ((cached-value (gethash cache table :no-value)))
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(if (or (eq cached-value :no-value)
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(< (or (plist-get magithub-cache-refresh-seconds-plist cache)
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(plist-get magithub-cache-refresh-seconds-plist t))
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(time-to-seconds (time-since (car cached-value)))))
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(cdr (puthash cache (cons (current-time) (eval default)) table))
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(when magithub-debug-mode
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(message "Using cached value for %S (retrieved %s)"
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cache (format-time-string "%F %T" (car cached-value))))
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(cdr cached-value))))
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(defun magithub-cache (repo cache default)
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(declare (indent defun))
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(magithub-cache--table (magithub-cache--get-table repo) cache default))
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(defun magithub-cache-value--table (table cache)
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"The cached value for CACHE."
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(let ((c (gethash cache table :no-value)))
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(unless (eq c :no-value)
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(cdr c))))
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(defun magithub-cache-value (repo cache)
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"The cached value for CACHE."
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(magithub-cache-value--table (magithub-cache--get-table repo) cache))
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(defun magithub-cache-clear (repo &optional cache)
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"Clear the cache for CACHE.
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If CACHE is nil, the entire cache is cleared."
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(if cache (remhash cache (magithub-cache--get-table repo))
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(cl-delete repo magithub-cache--cache
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:key #'car :test #'equal)))
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(defun magithub-refresh ()
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"Refresh all GitHub data."
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(interactive)
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(magithub-cache-clear)
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(magit-refresh))
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(provide 'magithub-cache)
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;;; magithub-cache.el ends here
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