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;;; markdown-config --- Settings for Editing Markdown -*- lexical-binding: t; coding: utf-8; -*-
;; author Craig Jennings <c@cjennings.net>
;;; Commentary:
;;
;; Layer: 3 (Domain Workflow).
;; Category: D/P.
;; Load shape: eager.
;; Eager reason: none; markdown editing, a mode-loaded deferral candidate.
;; Top-level side effects: package configuration via use-package; org-src lang
;; mapping registered after-load.
;; Runtime requires: none (configures packages via use-package).
;; Direct test load: yes.
;;
;;; Code:
;;;; ------------------------- Markdown-Mode -------------------------
(use-package markdown-mode
:mode (("README\\.md\\'" . gfm-mode)
("\\.md\\'" . markdown-mode)
("\\.markdown\\'" . markdown-mode))
:bind (:map markdown-mode-map
("<f2>" . markdown-preview)) ;; use same key as compile for consistency
:init (setq markdown-command "multimarkdown"))
;; Register markdown as a known org-src-block language so `org-lint'
;; stops warning on `#+begin_src markdown ... #+end_src' and `C-c ''
;; inside such a block opens it in `markdown-mode' instead of falling
;; back to fundamental-mode.
(with-eval-after-load 'org
(add-to-list 'org-src-lang-modes '("markdown" . markdown)))
;;;; ------------------------- Impatient-Mode ------------------------
;; allows for live previews of your html
;; see: https://github.com/skeeto/impatient-mode
(use-package impatient-mode
:defer t
:config
(setq imp-set-user-filter 'markdown-html))
;;;; --------------------- WIP: Markdown-Preview ---------------------
(defun cj/markdown-preview-server-start ()
"Start the simple-httpd listener that serves the live markdown preview.
Idempotent: re-running while the server is already up is a no-op."
(interactive)
(require 'simple-httpd)
(httpd-start)
(message "markdown preview server running on http://localhost:8080/imp"))
;; the filter to apply to markdown before impatient-mode pushes it to the server
(defun markdown-preview ()
"Open the current buffer as a live HTML preview at http://localhost:8080/imp.
The simple-httpd listener must already be running -- see
`cj/markdown-preview-server-start'. Starting a network listener as a
side effect of opening a preview is surprising, so the server start
lives in a separate command."
(interactive)
(unless (and (boundp 'httpd-process) httpd-process)
(user-error "markdown preview server not running; run `M-x cj/markdown-preview-server-start' first"))
(impatient-mode 1)
(setq imp-user-filter #'cj/markdown-html)
(cl-incf imp-last-state)
(imp--notify-clients)
;; Use plain `browse-url' (not `browse-url-generic') so the user's
;; default protocol handler picks the browser, and use `http://' --
;; simple-httpd serves plaintext; the previous `https://' URL caused
;; a TLS handshake against a non-TLS listener and the preview never
;; rendered.
(browse-url "http://localhost:8080/imp"))
(defun cj/markdown-html (buffer)
(princ (with-current-buffer buffer
(format "<!DOCTYPE html><html><title>Impatient Markdown</title><xmp theme=\"united\" style=\"display:none;\"> %s </xmp><script src=\"http://ndossougbe.github.io/strapdown/dist/strapdown.js\"></script></html>"
(buffer-substring-no-properties (point-min) (point-max))))
(current-buffer)))
(provide 'markdown-config)
;;; markdown-config.el ends here
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