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org-chef-utils.el
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org-chef-utils.el
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;;; org-chef-utils.el --- Utilities for org-chef. -*- lexical-binding: t; -*-
;; Copyright (C) 2018 Calvin Beck
;; Author: Calvin Beck <[email protected]>
;; URL: https://github.com/Chobbes/org-chef
;; Created: 2018
;; Copyright 2018 Calvin Beck
;; Permission is hereby granted, free of charge, to any person
;; obtaining a copy of this software and associated documentation
;; files (the "Software"), to deal in the Software without
;; restriction, including without limitation the rights to use, copy,
;; modify, merge, publish, distribute, sublicense, and/or sell copies
;; of the Software, and to permit persons to whom the Software is
;; furnished to do so, subject to the following conditions:
;; The above copyright notice and this permission notice shall be
;; included in all copies or substantial portions of the Software.
;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
;; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
;; BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
;; ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
;; CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
;; SOFTWARE.
;;; Commentary:
;; Utility functions for org-chef.
;;; Code:
(require 'cl-macs)
(require 'gnutls)
(require 'dom)
(defun org-chef-remove-empty-strings (lst)
"Filter out any empty strings in a list of strings (LST)."
(seq-filter (lambda (x) (/= (length x) 0)) lst))
(defun org-chef-dom-children (dom)
"Get the child nodes of the DOM, remove strings."
(seq-filter (lambda (x) (not (stringp x)))
(dom-children dom)))
(defun org-chef-render-html (text)
"Turn an html string into normal text."
(with-temp-buffer
(insert text)
(shr-render-buffer (current-buffer))
(buffer-string)))
(defun org-chef-insert-org-list (lst &optional bullet)
"Insert LST as an ‘org-mode’ plain list.
The optional argument BULLET specifies which type of bullet point
should be used."
(mapcar (lambda (x) (progn (insert (format "%s " (string-trim x)))
(org-cycle)
(org-delete-backward-char 1)
(org-ctrl-c-minus)
(if bullet (org-cycle-list-bullet bullet))
(org-return)))
lst))
(defun org-chef-url-retrieve-synchronously (url)
"Fetch URL using url-retrieve-synchronously.
This is a wrapper for url-retrieve-synchronously, which primarily serves to implement workarounds."
(let ((gnutls-algorithm-priority
(if org-chef-fetch-workaround
"NORMAL:-VERS-TLS1.3"
gnutls-algorithm-priority)))
(url-retrieve-synchronously url)))
(defun org-chef-string-to-dom (xml)
(with-temp-buffer
(insert xml)
(xml-parse-region (point-min) (point-max))))
(defun org-chef-url-retrieve-dom (url)
"Fetch URL synchronously, and parse into a DOM structure"
(with-current-buffer (org-chef-url-retrieve-synchronously url)
(goto-char (point-min))
(search-forward "\n\n") ; skip past HTTP headers
(let ((result (libxml-parse-html-region (point) (point-max))))
(kill-buffer) ; don't leak buffer
result)))
(defun org-chef-join (strings separator)
"Joins a list of strings using a separator"
(mapconcat #'identity strings separator))
;; Adapted from https://emacs.stackexchange.com/a/7150
(defun org-chef-regexp-matches (regexp string)
"Get a list of all regexp matches in a string"
(save-match-data
(let ((pos 0) stop matches)
(while (and (not stop) (string-match regexp string pos))
(push (match-string 0 string) matches)
(when (= (match-end 0) pos)
(setq stop t))
(setq pos (match-end 0)))
(nreverse matches))))
(provide 'org-chef-utils)
;;; org-chef-utils.el ends here