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org-roam-buffer.el
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org-roam-buffer.el
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;;; org-roam-buffer.el --- Metadata buffer -*- coding: utf-8; lexical-binding: t; -*-
;; Copyright © 2020 Jethro Kuan <[email protected]>
;; Author: Jethro Kuan <[email protected]>
;; URL: https://github.com/org-roam/org-roam
;; Keywords: org-mode, roam, convenience
;; Version: 1.2.3
;; Package-Requires: ((emacs "26.1") (dash "2.13") (f "0.17.2") (s "1.12.0") (org "9.3") (emacsql "3.0.0") (emacsql-sqlite3 "1.0.2"))
;; 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)
(require 'f)
(require 'ol)
(require 'org-element)
(require 'org-roam-macs)
(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
(defvar org-roam-mode)
(defvar org-roam--org-link-bracket-typed-re)
(declare-function org-roam-db--ensure-built "org-roam-db")
(declare-function org-roam-db--get-title "org-roam-db")
(declare-function org-roam-db-has-file-p "org-roam-db")
(declare-function org-roam--extract-refs "org-roam")
(declare-function org-roam--extract-titles "org-roam")
(declare-function org-roam--get-backlinks "org-roam")
(declare-function org-roam-backlinks-mode "org-roam")
(declare-function org-roam-mode "org-roam")
(declare-function org-roam--find-file "org-roam")
(declare-function org-roam-format-link "org-roam")
(declare-function org-roam-link-get-path "org-roam-link")
(defcustom org-roam-buffer-position 'right
"Position of `org-roam' buffer.
Valid values are
* left,
* right,
* top,
* bottom,
* a function returning one of the above."
:type '(choice (const left)
(const right)
(const top)
(const bottom)
function)
: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-ref-links)
"Hook run in the `org-roam-buffer' before it is displayed."
:type 'hook
:group 'org-roam)
(defcustom org-roam-buffer-preview-function #'org-roam-buffer--preview
"Function to obtain preview contents for a given link.
The function takes in two arguments, the FILE containing the
link, and the POINT of the link."
:type 'function
:group 'org-roam)
(defcustom org-roam-buffer-window-parameters nil
"Additional window parameters for the `org-roam-buffer' side window.
For example: (setq org-roam-buffer-window-parameters '((no-other-window . t)))"
:type '(alist)
:group 'org-roam)
(defvar org-roam-buffer--current nil
"Currently displayed file in `org-roam' buffer.")
(defun org-roam-buffer--find-file (file)
"Open FILE in the window `org-roam' was called from."
(setq file (expand-file-name file))
(let ((last-window org-roam-last-window))
(if (window-valid-p last-window)
(progn (with-selected-window last-window
(org-roam--find-file file))
(select-window last-window))
(org-roam--find-file file))))
(defun org-roam-buffer--insert-title ()
"Insert the org-roam-buffer title."
(insert (propertize (org-roam-db--get-title
(buffer-file-name org-roam-buffer--current))
'font-lock-face
'org-document-title)))
(defun org-roam-buffer--preview (file point)
"Get preview content for FILE at POINT."
(save-excursion
(org-roam--with-temp-buffer file
(goto-char point)
(let ((elem (org-element-at-point)))
(or (org-element-property :raw-value elem)
(when-let ((begin (org-element-property :begin elem))
(end (org-element-property :end elem)))
(string-trim (buffer-substring-no-properties begin end))))))))
(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-expand-links (content orig-path)
"Crawl CONTENT for relative links and corrects them to be correctly displayed.
ORIG-PATH is the path where the CONTENT originated."
(with-temp-buffer
(insert content)
(goto-char (point-min))
(let (link link-type)
(while (re-search-forward org-roam--org-link-bracket-typed-re (point-max) t)
(setq link-type (match-string 1)
link (match-string 2))
(when (and (string-equal link-type "file")
(f-relative-p link))
(replace-match (org-roam-link-get-path (expand-file-name link (file-name-directory orig-path)))
nil t nil 2))))
(buffer-string)))
(defun org-roam-buffer--insert-ref-links ()
"Insert ref backlinks for the current buffer."
(when-let* ((refs (with-temp-buffer
(insert-buffer-substring org-roam-buffer--current)
(org-roam--extract-refs)))
(paths (mapcar #'cdr refs)))
(if-let* ((key-backlinks (mapcan #'org-roam--get-backlinks paths))
(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 "Ref Backlink" l))))
(dolist (group grouped-backlinks)
(let ((file-from (car group))
(bls (cdr group)))
(insert (format "** %s\n"
(org-roam-format-link file-from
(org-roam-db--get-title file-from)
"file")))
(dolist (backlink bls)
(pcase-let ((`(,file-from _ ,props) backlink))
(insert (if-let ((content (funcall org-roam-buffer-preview-function file-from (plist-get props :point))))
(propertize (org-roam-buffer-expand-links content file-from)
'help-echo "mouse-1: visit backlinked note"
'file-from file-from
'file-from-point (plist-get props :point))
"")
"\n\n"))))))
(insert "\n\n* No ref backlinks!"))))
(defun org-roam-buffer--insert-backlinks ()
"Insert the org-roam-buffer backlinks string for the current buffer."
(let (props file-from)
(if-let* ((file-path (buffer-file-name org-roam-buffer--current))
(titles (with-current-buffer org-roam-buffer--current
(org-roam--extract-titles)))
(backlinks (org-roam--get-backlinks (push file-path titles)))
(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)
(setq file-from (car group))
(setq props (mapcar (lambda (row) (nth 2 row)) (cdr group)))
(setq props (seq-sort-by (lambda (p) (plist-get p :point)) #'< props))
(insert (format "** %s\n"
(org-roam-format-link file-from
(org-roam-db--get-title file-from)
"file")))
(dolist (prop props)
(insert "*** "
(if-let ((outline (plist-get prop :outline)))
(-> outline
(string-join " > ")
(org-roam-buffer-expand-links file-from))
"Top")
"\n"
(if-let ((content (funcall org-roam-buffer-preview-function file-from (plist-get prop :point))))
(propertize
(s-trim (s-replace "\n" " " (org-roam-buffer-expand-links content file-from)))
'help-echo "mouse-1: visit backlinked note"
'file-from file-from
'file-from-point (plist-get prop :point))
"")
"\n\n"))))
(insert "\n\n* No backlinks!"))))
(defun org-roam-buffer-update ()
"Update the `org-roam-buffer'."
(interactive)
(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-file-name buffer)
(org-roam-db-has-file-p (buffer-file-name 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 ((position (if (functionp org-roam-buffer-position)
(funcall org-roam-buffer-position)
org-roam-buffer-position)))
(save-selected-window
(-> (get-buffer-create org-roam-buffer)
(display-buffer-in-side-window
`((side . ,position)
(window-parameters . ,org-roam-buffer-window-parameters)))
(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))))))))
(defun org-roam-buffer-activate ()
"Activate display of the `org-roam-buffer'."
(interactive)
(unless org-roam-mode (org-roam-mode))
(setq org-roam-last-window (get-buffer-window))
(org-roam-buffer--get-create))
(defun org-roam-buffer-deactivate ()
"Deactivate display of the `org-roam-buffer'."
(interactive)
(setq org-roam-last-window (get-buffer-window))
(delete-window (get-buffer-window org-roam-buffer)))
(defun org-roam-buffer-toggle-display ()
"Toggle display of the `org-roam-buffer'."
(interactive)
(pcase (org-roam-buffer--visibility)
('visible (org-roam-buffer-deactivate))
((or 'exists 'none) (org-roam-buffer-activate))))
(provide 'org-roam-buffer)
;;; org-roam-buffer.el ends here