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90 lines
3.4 KiB
EmacsLisp
90 lines
3.4 KiB
EmacsLisp
;;; org-roam-protocol.el --- Protocol handler for roam:// links
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;; Copyright © 2020 Jethro Kuan <jethrokuan95@gmail.com>
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;; Author: Jethro Kuan <jethrokuan95@gmail.com>
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;; This file is NOT part of GNU Emacs.
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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, or (at your option)
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;; any later version.
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;;
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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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;;
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;;
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;; Intercept calls from emacsclient for `roam://' links.
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;;
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;; This is done by advising `server-visit-files' to scan the list of filenames
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;; for `org-roam-protocol-the-protocol'.
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;;
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;; `roam://' links are expected to be absolute file locations, for example,
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;; `roam:///home/me/file.org'. The `roam://' prefix is stripped, and emacsclient
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;; opens the location as per usual.
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;;
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;; Any application that supports calling external programs with an URL as
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;; argument may be used with this functionality.
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;;
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;; Usage:
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;; ------
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;;
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;; 1.) Add this to your init file:
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;; (add-to-list 'load-path "/path/to/org-roam-protocol.el"')
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;; (require 'org-roam-protocol)
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;;
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;; 2.) Ensure emacs-server is up and running.
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;; 3.) Try this from the command line:
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;; $ emacsclient roam:///tmp/test.org
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;;
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;; If it works, you can now setup other applications for using this feature.
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(require 'org)
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;;; Variables:
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(defconst org-roam-protocol-the-protocol "roam"
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"This is the protocol to detect if org-roam-protocol.el is loaded.
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You will have to define just one protocl handler OS-wide (MS-Windows)
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or per application (Linux). That protocol handler should call emacsclient.")
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;;; Code:
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(defun org-roam-protocol-check-filename-for-protocol (fname)
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"Check if `org-roam-protocol-the-protocol' is used in FNAME.
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If the protocol is found, the protocol is stripped from fname,
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and the value is passed to the server as filename.
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If the function returns nil, the filename is removed from the
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list of filenames passed from emacsclient to the server. If the
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function returns a non-nil value, that value is passed to the
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server as filename."
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(let ((the-protocol (concat (regexp-quote org-roam-protocol-the-protocol) ":")))
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(when (string-match the-protocol fname)
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(cadr (split-string fname the-protocol)))))
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(defadvice server-visit-files (before org-roam-protocol-detect-protocol-server activate)
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"Advice `server-visit-files' to strip the `roam:/' protocol.
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Default to `server-find-files' handling for file locations."
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(let ((flist (ad-get-arg 0)))
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(dolist (var flist)
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;; `\' to '/' on windows.
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(let ((fname (expand-file-name (car var)))
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org-roam-location)
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(setq org-roam-location (org-roam-protocol-check-filename-for-protocol
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fname))
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(when (stringp org-roam-location) ; location for Org-roam file
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(setcar var org-roam-location))))))
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(provide 'org-roam-protocol)
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;;; org-roam-protocol.el ends here
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