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org-roam-buffer.el
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org-roam-buffer.el
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;;; org-roam-buffer.el --- Roam Research replica with Org-mode -*- coding: utf-8; lexical-binding: t -*-
;; Copyright © 2020 Jethro Kuan <[email protected]>
;; Author: Jethro Kuan <[email protected]>
;; URL: https://github.com/jethrokuan/org-roam
;; Keywords: org-mode, roam, convenience
;; Version: 1.1.0
;; Package-Requires: ((emacs "26.1") (dash "2.13") (f "0.17.2") (s "1.12.0") (org "9.3") (emacsql "3.0.0") (emacsql-sqlite "1.0.0"))
;; This file is NOT part of GNU Emacs.
;; 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, 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;
;; This library provides the org-roam-buffer functionality for org-roam
;;; Code:
;;;; Library Requires
(eval-when-compile (require 'subr-x))
(require 'cl-lib)
(require 'dash)
(require 's)
(defvar org-roam-directory)
(defvar org-link-frame-setup)
(defvar org-return-follows-link)
(defvar org-roam-backlinks-mode)
(defvar org-roam-last-window)
(defvar org-ref-cite-types) ;; in org-ref-core.el
(declare-function org-roam-db--ensure-built "org-roam-db")
(declare-function org-roam--extract-ref "org-roam")
(declare-function org-roam--get-title-or-slug "org-roam")
(declare-function org-roam--get-backlinks "org-roam")
(declare-function org-roam-backlinks-mode "org-roam")
(defcustom org-roam-buffer-position 'right
"Position of `org-roam' buffer.
Valid values are
* left,
* right,
* top,
* bottom."
:type '(choice (const left)
(const right)
(const top)
(const bottom))
:group 'org-roam)
(defcustom org-roam-buffer-width 0.33
"Width of `org-roam' buffer.
Has an effect if and only if `org-roam-buffer-position' is `left' or `right'."
:type 'number
:group 'org-roam)
(defcustom org-roam-buffer-height 0.27
"Height of `org-roam' buffer.
Has an effect if and only if `org-roam-buffer-position' is `top' or `bottom'."
:type 'number
:group 'org-roam)
(defcustom org-roam-buffer "*org-roam*"
"Org-roam buffer name."
:type 'string
:group 'org-roam)
(defcustom org-roam-buffer-prepare-hook '(org-roam-buffer--insert-title
org-roam-buffer--insert-backlinks
org-roam-buffer--insert-citelinks)
"Hook run in the `org-roam-buffer' before it is displayed."
:type 'hook
:group 'org-roam)
(defcustom org-roam-buffer-no-delete-other-windows nil
"The `no-delete-other-windows' parameter of the `org-roam-buffer' window.
When non-nil, the window will not be closed when deleting other windows."
:type 'boolean
:group 'org-roam)
(defvar org-roam-buffer--current nil
"Currently displayed file in `org-roam' buffer.")
(defun org-roam-buffer--insert-title ()
"Insert the org-roam-buffer title."
(insert (propertize (org-roam--get-title-or-slug
(buffer-file-name org-roam-buffer--current))
'font-lock-face
'org-document-title)))
(defun org-roam-buffer--pluralize (string number)
"Conditionally pluralize STRING if NUMBER is above 1."
(let ((l (pcase number
((pred (listp)) (length number))
((pred (integerp)) number)
(wrong-type (signal 'wrong-type-argument
`((listp integerp)
,wrong-type))))))
(concat string (when (> l 1) "s"))))
(defun org-roam-buffer--insert-citelinks ()
"Insert citation backlinks for the current buffer."
(if-let* ((ref (with-temp-buffer
(insert-buffer-substring org-roam-buffer--current)
(org-roam--extract-ref)))
(org-ref-p (require 'org-ref nil t)) ; Ensure that org-ref is present
(key-backlinks (org-roam--get-backlinks (cdr ref)))
(grouped-backlinks (--group-by (nth 0 it) key-backlinks)))
(progn
(insert (let ((l (length key-backlinks)))
(format "\n\n* %d %s\n"
l (org-roam-buffer--pluralize "Cite backlink" l))))
(dolist (group grouped-backlinks)
(let ((file-from (car group))
(bls (cdr group)))
(insert (format "** [[file:%s][%s]]\n"
file-from
(org-roam--get-title-or-slug file-from)))
(dolist (backlink bls)
(pcase-let ((`(,file-from _ ,props) backlink))
(insert (propertize
(s-trim (s-replace "\n" " "
(plist-get props :content)))
'help-echo "mouse-1: visit backlinked note"
'file-from file-from
'file-from-point (plist-get props :point)))
(insert "\n\n"))))))
(insert "\n\n* No cite backlinks!")))
(defun org-roam-buffer--insert-backlinks ()
"Insert the org-roam-buffer backlinks string for the current buffer."
(if-let* ((file-path (buffer-file-name org-roam-buffer--current))
(backlinks (org-roam--get-backlinks file-path))
(grouped-backlinks (--group-by (nth 0 it) backlinks)))
(progn
(insert (let ((l (length backlinks)))
(format "\n\n* %d %s\n"
l (org-roam-buffer--pluralize "Backlink" l))))
(dolist (group grouped-backlinks)
(let ((file-from (car group))
(bls (cdr group)))
(insert (format "** [[file:%s][%s]]\n"
file-from
(org-roam--get-title-or-slug file-from)))
(dolist (backlink bls)
(pcase-let ((`(,file-from _ ,props) backlink))
(insert (propertize
(s-trim (s-replace "\n" " "
(plist-get props :content)))
'help-echo "mouse-1: visit backlinked note"
'file-from file-from
'file-from-point (plist-get props :point)))
(insert "\n\n"))))))
(insert "\n\n* No backlinks!")))
(defun org-roam-buffer-update ()
"Update the `org-roam-buffer'."
(org-roam-db--ensure-built)
(let* ((source-org-roam-directory org-roam-directory))
(with-current-buffer org-roam-buffer
;; When dir-locals.el is used to override org-roam-directory,
;; org-roam-buffer should have a different local org-roam-directory and
;; default-directory, as relative links are relative from the overridden
;; org-roam-directory.
(setq-local org-roam-directory source-org-roam-directory)
(setq-local default-directory source-org-roam-directory)
;; Locally overwrite the file opening function to re-use the
;; last window org-roam was called from
(setq-local org-link-frame-setup
(cons '(file . org-roam--find-file) org-link-frame-setup))
(let ((inhibit-read-only t))
(erase-buffer)
(unless (eq major-mode 'org-mode)
(org-mode))
(unless org-roam-backlinks-mode
(org-roam-backlinks-mode))
(make-local-variable 'org-return-follows-link)
(setq org-return-follows-link t)
(run-hooks 'org-roam-buffer-prepare-hook)
(read-only-mode 1)))))
(cl-defun org-roam-buffer--update-maybe (&key redisplay)
"Reconstructs `org-roam-buffer'.
This needs to be quick or infrequent, because this is run at
`post-command-hook'. If REDISPLAY, force an update of
`org-roam-buffer'."
(let ((buffer (window-buffer)))
(when (and (or redisplay
(not (eq org-roam-buffer--current buffer)))
(eq 'visible (org-roam-buffer--visibility))
(buffer-local-value 'buffer-file-truename buffer))
(setq org-roam-buffer--current buffer)
(org-roam-buffer-update))))
;;;; Toggling the org-roam buffer
(define-inline org-roam-buffer--visibility ()
"Return whether the current visibility state of the org-roam buffer.
Valid states are 'visible, 'exists and 'none."
(declare (side-effect-free t))
(inline-quote
(cond
((get-buffer-window org-roam-buffer) 'visible)
((get-buffer org-roam-buffer) 'exists)
(t 'none))))
(defun org-roam-buffer--set-width (width)
"Set the width of `org-roam-buffer' to `WIDTH'."
(unless (one-window-p)
(let ((window-size-fixed)
(w (max width window-min-width)))
(cond
((> (window-width) w)
(shrink-window-horizontally (- (window-width) w)))
((< (window-width) w)
(enlarge-window-horizontally (- w (window-width))))))))
(defun org-roam-buffer--set-height (height)
"Set the height of `org-roam-buffer' to `HEIGHT'."
(unless (one-window-p)
(let ((window-size-fixed)
(h (max height window-min-height)))
(cond
((> (window-height) h)
(shrink-window (- (window-height) h)))
((< (window-height) h)
(enlarge-window (- h (window-height))))))))
(defun org-roam-buffer--get-create ()
"Set up the `org-roam' buffer at `org-roam-buffer-position'."
(let ((window (get-buffer-window))
(position
(if (member org-roam-buffer-position '(right left top bottom))
org-roam-buffer-position
(let ((text-quoting-style 'grave))
(lwarn '(org-roam) :error
"Invalid org-roam-buffer-position: %s. Defaulting to \\='right"
org-roam-buffer-position))
'right)))
(-> (get-buffer-create org-roam-buffer)
(display-buffer-in-side-window
`((side . ,position)
(window-parameters . ((no-delete-other-windows . ,org-roam-buffer-no-delete-other-windows)))))
(select-window))
(pcase position
((or 'right 'left)
(org-roam-buffer--set-width (round (* (frame-width) org-roam-buffer-width))))
((or 'top 'bottom)
(org-roam-buffer--set-height (round (* (frame-height) org-roam-buffer-height)))))
(select-window window)))
(defun org-roam-buffer-toggle-display ()
"Toggle display of the `org-roam-buffer'."
(interactive)
(setq org-roam-last-window (get-buffer-window))
(pcase (org-roam-buffer--visibility)
('visible (delete-window (get-buffer-window org-roam-buffer)))
((or 'exists 'none) (org-roam-buffer--get-create))))
(provide 'org-roam-buffer)
;;; org-roam-buffer.el ends here