619 lines
24 KiB
EmacsLisp
619 lines
24 KiB
EmacsLisp
;;; org-roam.el --- Roam Research replica with Org-mode -*- coding: utf-8; lexical-binding: t -*-
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;;; Commentary:
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;;
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;;; Code:
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(require 'dash)
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(require 'org-element)
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(require 'async)
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(require 'subr-x)
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(require 's)
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(require 'f)
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;;; Customizations
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(defgroup org-roam nil
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"Roam Research replica in Org-mode."
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:group 'org
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:prefix "org-roam-")
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(defcustom org-roam-directory (expand-file-name "~/org-roam/")
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"Org-roam directory."
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:type 'directory
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:group 'org-roam)
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(defcustom org-roam-position 'right
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"Position of `org-roam' buffer.
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Valid values are
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* left,
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* right."
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:type '(choice (const left)
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(const right))
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:group 'org-roam)
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(defcustom org-roam-link-representation 'id
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"The value used to represent an org-roam link.
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Valid values are
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* file,
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* title."
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:type '(choice (const id)
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(const title))
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:group 'org-roam)
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(defcustom org-roam-link-id-format "§%s"
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"The format string used when inserting org-roam links that use id."
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:type 'string
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:group 'org-roam)
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(defcustom org-roam-link-title-format "%s"
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"The format string used when inserting org-roam links that use their title."
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:type 'string
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:group 'org-roam)
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(defcustom org-roam-buffer-width 0.33 "Width of `org-roam' buffer."
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:type 'number
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:group 'org-roam)
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(defcustom org-roam-buffer "*org-roam*"
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"Org-roam buffer name."
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:type 'string
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:group 'org-roam)
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(defcustom org-roam-graph-viewer (executable-find "firefox")
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"Path to executable for viewing SVG."
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:type 'string
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:group 'org-roam)
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(defcustom org-roam-graphviz-executable (executable-find "dot")
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"Path to graphviz executable."
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:type 'string
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:group 'org-roam)
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;;; Polyfills
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;; These are for functions I use that are only available in newer Emacs
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;; Introduced in Emacs 27.1
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(unless (fboundp 'make-empty-file)
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(defun make-empty-file (filename &optional parents)
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"Create an empty file FILENAME.
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Optional arg PARENTS, if non-nil then creates parent dirs as needed.
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If called interactively, then PARENTS is non-nil."
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(interactive
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(let ((filename (read-file-name "Create empty file: ")))
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(list filename t)))
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(when (and (file-exists-p filename) (null parents))
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(signal 'file-already-exists `("File exists" ,filename)))
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(let ((paren-dir (file-name-directory filename)))
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(when (and paren-dir (not (file-exists-p paren-dir)))
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(make-directory paren-dir parents)))
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(write-region "" nil filename nil 0)))
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;;; Dynamic variables
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(defvar org-roam-cache nil
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"Cache containing backlinks for `org-roam' buffers.")
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(defvar org-roam-current-file nil
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"Currently displayed file in `org-roam' buffer.")
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;;; Utilities
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(defun org-roam--org-roam-file-p ()
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"Return t if file is part of org-roam system, false otherwise."
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(and (buffer-file-name (current-buffer))
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(f-child-of-p (file-truename (buffer-file-name (current-buffer)))
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org-roam-directory)))
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(defun org-roam--get-title (file)
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"Return title of `FILE'.
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It first tries the cache. If the cache does not contain the file,
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it will return the title by loading the file."
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(if-let ((titles-cache (plist-get org-roam-cache :titles)))
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(or (gethash file titles-cache)
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(org-roam--extract-file-title file))
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(org-roam--extract-file-title file)))
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(defun org-roam--find-files (dir)
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"Return all org-roam files in `DIR'."
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(if (file-exists-p dir)
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(let ((files (directory-files dir t "." t))
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(dir-ignore-regexp (concat "\\(?:"
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"\\."
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"\\|\\.\\."
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"\\)$"))
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result)
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(dolist (file files)
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(cond
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((file-directory-p file)
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(when (not (string-match dir-ignore-regexp file))
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(setq result (append (org-roam--find-files file) result))))
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((and (file-readable-p file)
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(string= (file-name-extension file) "org"))
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(setq result (cons (file-truename file) result)))))
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result)))
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(defun org-roam--find-all-files ()
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"Return all org-roam files."
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(org-roam--find-files org-roam-directory))
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(defun org-roam--get-file-path (id &optional absolute)
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"Convert identifier `ID' to file path.
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If `ABSOLUTE', return the absolute file-path. Else, return the relative file-path."
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(let ((absolute-file-path (expand-file-name
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(concat id ".org")
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(file-truename org-roam-directory))))
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(if absolute
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absolute-file-path
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(file-relative-name absolute-file-path org-roam-directory))))
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(defun org-roam--get-id (file-path)
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"Convert `FILE-PATH' to the org-roam id."
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(file-name-sans-extension
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(file-relative-name
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(file-truename file-path)
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(file-truename org-roam-directory))))
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(defun org-roam--get-title-or-id (file-path)
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"Convert `FILE-PATH' to the file title, if it exists. Else, return the id."
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(or (org-roam--get-title file-path)
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(org-roam--get-id file-path)))
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;;; Creating org-roam files
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(defun org-roam--new-file-named (slug)
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"Create a new file named `SLUG'.
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`SLUG' is the short file name, without a path or a file extension."
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(interactive "sNew filename (without extension): ")
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(find-file (org-roam--get-file-path slug t)))
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(defun org-roam-new-file ()
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"Quickly create a new file, using the current timestamp."
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(interactive)
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(org-roam--new-file-named (format-time-string "%Y-%m-%d-%H%M%S" (current-time))))
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;;; Inserting org-roam links
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(defun org-roam-insert ()
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"Insert an org-roam link."
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(interactive)
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(pcase org-roam-link-representation
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('id (org-roam--insert-id))
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('title (org-roam--insert-title))))
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(defun org-roam--insert-title ()
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"Find `ID', and insert a relative org link to it at point."
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(let* ((completions (mapcar (lambda (file)
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(list (org-roam--get-title-or-id file)
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(org-roam--get-id file)))
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(org-roam--find-all-files)))
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(title (completing-read "File: " completions))
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(id (cadr (assoc title completions))))
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(unless id
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(setq id (read-string "Enter new file id: ")))
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(let ((file-path (org-roam--get-file-path id)))
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(unless (file-exists-p file-path)
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(make-empty-file file-path))
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(insert (format "[[%s][%s]]"
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(concat "file:" file-path)
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(format org-roam-link-title-format title))))))
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(defun org-roam--insert-id ()
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"Find `ID', and insert a relative org link to it at point."
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(let* ((id (completing-read "File: " (mapcar #'org-roam--get-id (org-roam--find-all-files))))
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(file-path (org-roam--get-file-path id)))
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(unless (file-exists-p file-path)
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(make-empty-file file-path))
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(insert (format "[[%s][%s]]"
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(concat "file:" file-path)
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(format org-roam-link-id-format id)))))
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;;; Finding org-roam files
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(defun org-roam-find-file ()
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"Find and open an org-roam file."
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(interactive)
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(let* ((completions (mapcar (lambda (file)
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(list (org-roam--get-title-or-id file) file))
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(org-roam--find-all-files)))
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(title-or-id (completing-read "File: " completions))
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(file-path (cadr (assoc title-or-id completions))))
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(unless file-path
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(let ((id (read-string "Enter new file id: ")))
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(setq file-path (org-roam--get-file-path id t))))
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(find-file file-path)))
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;;; Building the org-roam cache (asynchronously)
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(defun org-roam--build-cache-async ()
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"Builds the cache asychronously, saving it into `org-roam-cache'."
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(interactive)
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(setq org-roam-files (org-roam--find-all-files))
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(async-start
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`(lambda ()
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(require 'org)
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(require 'org-element)
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(require 'subr-x) ; temp-fix
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(require 'cl-lib)
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,(async-inject-variables "org-roam-files")
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,(async-inject-variables "org-roam-directory")
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(let ((backward-links (make-hash-table :test #'equal))
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(forward-links (make-hash-table :test #'equal))
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(file-titles (make-hash-table :test #'equal)))
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(cl-flet* ((org-roam--parse-content
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(file)
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(with-temp-buffer
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(insert-file-contents file)
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(with-current-buffer (current-buffer)
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(org-element-map (org-element-parse-buffer) 'link
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(lambda (link)
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(let ((type (org-element-property :type link))
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(path (org-element-property :path link))
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(start (org-element-property :begin link)))
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(when (and (string= type "file")
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(string= (file-name-extension path) "org"))
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(goto-char start)
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(let* ((element (org-element-at-point))
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(content (or (org-element-property :raw-value element)
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(buffer-substring
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(or (org-element-property :content-begin element)
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(org-element-property :begin element))
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(or (org-element-property :content-end element)
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(org-element-property :end element))))))
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(list :from file
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:to (file-truename (expand-file-name path org-roam-directory))
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:content (string-trim content))))))))))
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(org-roam--process-items
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(items)
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(mapcar
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(lambda (item)
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(pcase-let ((`(:from ,p-from :to ,p-to :content ,content) item))
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;; Build forward-links
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(let ((links (gethash p-from forward-links)))
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(if links
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(puthash p-from
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(if (member p-to links)
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links
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(cons p-to links)) forward-links)
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(puthash p-from (list p-to) forward-links)))
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;; Build backward-links
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(let ((contents-hash (gethash p-to backward-links)))
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(if contents-hash
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(if-let ((contents-list (gethash p-from contents-hash)))
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(let ((updated (cons content contents-list)))
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(puthash p-from updated contents-hash)
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(puthash p-to contents-hash backward-links))
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(progn
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(puthash p-from (list content) contents-hash)
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(puthash p-to contents-hash backward-links)))
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(let ((contents-hash (make-hash-table :test #'equal)))
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(puthash p-from (list content) contents-hash)
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(puthash p-to contents-hash backward-links))))))
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items))
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(org-roam--extract-title
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(buffer)
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(with-current-buffer buffer
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(org-element-map
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(org-element-parse-buffer)
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'keyword
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(lambda (kw)
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(when (string= (org-element-property :key kw) "TITLE")
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(org-element-property :value kw)))
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:first-match t))))
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(mapcar #'org-roam--process-items
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(mapcar #'org-roam--parse-content org-roam-files))
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(mapcar (lambda (file)
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(with-temp-buffer
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(insert-file-contents file)
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(when-let ((title (org-roam--extract-title (current-buffer))))
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(puthash file title file-titles))))
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org-roam-files))
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(list
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:forward forward-links
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:backward backward-links
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:titles file-titles)))
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(lambda (cache)
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(setq org-roam-cache cache)
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(message "Org-roam cache built!"))))
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(defun org-roam--insert-item (item)
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"Insert `ITEM' into `org-roam-cache'.
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`ITEM' is of the form: (:from from-path :to to-path :content preview-content)
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Before calling this function, `org-roam-cache' should be already populated."
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(let ((forward-cache (plist-get org-roam-cache :forward))
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(backward-cache (plist-get org-roam-cache :backward))
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(title-cache (plist-get org-roam-cache :titles)))
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(pcase-let ((`(:from ,p-from :to ,p-to :content ,content) item))
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;; Build forward-links
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(let ((links (gethash p-from forward-cache)))
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(if links
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(puthash p-from
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(if (member p-to links)
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links
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(cons p-to links)) forward-cache)
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(puthash p-from (list p-to) forward-cache)))
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;; Build backward-links
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(let ((contents-hash (gethash p-to backward-cache)))
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(if contents-hash
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(if-let ((contents-list (gethash p-from contents-hash)))
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(let ((updated (cons content contents-list)))
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(puthash p-from updated contents-hash)
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(puthash p-to contents-hash backward-cache))
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(progn
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(puthash p-from (list content) contents-hash)
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(puthash p-to contents-hash backward-cache)))
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(let ((contents-hash (make-hash-table :test #'equal)))
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(puthash p-from (list content) contents-hash)
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(puthash p-to contents-hash backward-cache))))
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(setq org-roam-cache (list :forward forward-cache
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:backward backward-cache
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:titles title-cache)))))
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(defun org-roam--parse-content ()
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"Parse the current buffer, and return a list of items for processing."
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(with-current-buffer (current-buffer)
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(org-element-map (org-element-parse-buffer) 'link
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(lambda (link)
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(let ((type (org-element-property :type link))
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(path (org-element-property :path link))
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(start (org-element-property :begin link)))
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(when (and (string= type "file")
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(string= (file-name-extension path) "org"))
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(goto-char start)
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(let* ((element (org-element-at-point))
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(content (or (org-element-property :raw-value element)
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(buffer-substring
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(or (org-element-property :content-begin element)
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(org-element-property :begin element))
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(or (org-element-property :content-end element)
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(org-element-property :end element))))))
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(list :from (file-truename (buffer-file-name (current-buffer)))
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:to (file-truename (expand-file-name path org-roam-directory))
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:content (string-trim content)))))))))
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(defun org-roam--clear-cache-for-buffer (buffer)
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"Remove any related links to the file for `BUFFER'.
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This is equivalent to removing the node from the graph."
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(with-current-buffer (current-buffer)
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(let ((file (file-truename (buffer-file-name buffer)))
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(forward-cache (plist-get org-roam-cache :forward))
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(backward-cache (plist-get org-roam-cache :backward))
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(titles-cache (plist-get org-roam-cache :titles)))
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;; Step 1: Remove all existing links for file
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(when-let ((forward-links (gethash file forward-cache)))
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;; Delete backlinks to file
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(dolist (link forward-links)
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(when-let ((backward-links (gethash link backward-cache)))
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(remhash file backward-links)
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(puthash link backward-links backward-cache)))
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;; Clean out forward links
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(remhash file forward-cache))
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;; Step 2: Remove from the title cache
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(remhash file titles-cache)
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(setq org-roam-cache (list :forward forward-cache
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:backward backward-cache
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:titles titles-cache)))))
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(defun org-roam--update-cache-title (buffer)
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"Inserts the `TITLE' of file in buffer into the cache."
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(when-let ((titles-cache (plist-get org-roam-cache :titles))
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(title (org-roam--extract-title buffer)))
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(puthash (file-truename (buffer-file-name buffer))
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title
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titles-cache)
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(setq org-roam-cache (plist-put org-roam-cache :titles titles-cache))))
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(defun org-roam--update-cache ()
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"Update `org-roam-cache' for the current buffer file."
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(save-excursion
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(org-roam--clear-cache-for-buffer (current-buffer))
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;; Insert into title cache
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(org-roam--update-cache-title (current-buffer))
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;; Insert new items
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(let ((items (org-roam--parse-content)))
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(dolist (item items)
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(org-roam--insert-item item)))))
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;;; Org-roam daily notes
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(defun org-roam-today ()
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"Create the file for today."
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(interactive)
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(org-roam--new-file-named (format-time-string "%Y-%m-%d" (current-time))))
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(defun org-roam-tomorrow ()
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"Create the file for tomorrow."
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(interactive)
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(org-roam--new-file-named (format-time-string "%Y-%m-%d" (time-add 86400 (current-time)))))
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(defun org-roam-date ()
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"Create the file for any date using the calendar."
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(interactive)
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(let ((time (org-read-date nil 'to-time nil "Date: ")))
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(org-roam--new-file-named (format-time-string "%Y-%m-%d" time))))
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;;; Org-roam buffer updates
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(defun org-roam--extract-title (buffer)
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"Extract the title from `BUFFER'."
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(with-current-buffer buffer
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(org-element-map
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(org-element-parse-buffer)
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'keyword
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(lambda (kw)
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(when (string= (org-element-property :key kw) "TITLE")
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(org-element-property :value kw)))
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:first-match t)))
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(defun org-roam--extract-file-title (file)
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"Extract the title from `FILE'."
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(with-temp-buffer
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(insert-file-contents file)
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(org-element-map
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(org-element-parse-buffer)
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'keyword
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(lambda (kw)
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(when (string= (org-element-property :key kw) "TITLE")
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(org-element-property :value kw)))
|
|
:first-match t)))
|
|
|
|
(defun org-roam-update (file-path)
|
|
"Show the backlinks for given org file for file at `FILE-PATH'."
|
|
(when org-roam-cache
|
|
(let ((buffer-title (org-roam--get-title-or-id file-path)))
|
|
(with-current-buffer org-roam-buffer
|
|
(let ((inhibit-read-only t))
|
|
(erase-buffer)
|
|
(when (not (eq major-mode 'org-mode))
|
|
(org-mode))
|
|
(make-local-variable 'org-return-follows-link)
|
|
(setq org-return-follows-link t)
|
|
(insert
|
|
(propertize buffer-title 'font-lock-face 'org-document-title))
|
|
(if-let ((backlinks (gethash file-path (plist-get org-roam-cache :backward))))
|
|
(progn
|
|
(insert (format "\n\n* %d Backlinks\n"
|
|
(hash-table-count backlinks)))
|
|
(maphash (lambda (file-from contents)
|
|
(insert (format "** [[file:%s][%s]]\n"
|
|
file-from
|
|
(org-roam--get-title-or-id file-from)))
|
|
(dolist (content contents)
|
|
(insert (concat (propertize (s-trim (s-replace "\n" " " content))
|
|
'font-lock-face 'org-block)
|
|
"\n\n"))))
|
|
backlinks))
|
|
(insert "\n\n* No backlinks!")))
|
|
(read-only-mode 1)))
|
|
(setq org-roam-current-file file-path)))
|
|
|
|
;;; Show/hide the org-roam buffer
|
|
(define-inline org-roam--current-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--set-width (width)
|
|
"Set the width of the 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--setup-buffer ()
|
|
"Setup the `org-roam' buffer at the `org-roam-position'."
|
|
(let ((window (get-buffer-window)))
|
|
(-> (get-buffer-create org-roam-buffer)
|
|
(display-buffer-in-side-window
|
|
`((side . ,org-roam-position)))
|
|
(select-window))
|
|
(org-roam--set-width
|
|
(round (* (frame-width)
|
|
org-roam-buffer-width)))
|
|
(select-window window)))
|
|
|
|
(defun org-roam ()
|
|
"Pops up the window `org-roam-buffer' accordingly."
|
|
(interactive)
|
|
(pcase (org-roam--current-visibility)
|
|
('visible (delete-window (get-buffer-window org-roam-buffer)))
|
|
('exists (org-roam--setup-buffer))
|
|
('none (org-roam--setup-buffer))))
|
|
|
|
;;; The minor mode definition that updates the buffer
|
|
(defun org-roam--maybe-enable ()
|
|
"Enable org-roam updating for file, if file is an org-roam file."
|
|
(when (org-roam--org-roam-file-p)
|
|
(org-roam--enable)))
|
|
|
|
(defun org-roam--enable ()
|
|
"Enable org-roam updating for file.
|
|
|
|
1. If the cache does not yet exist, build it asynchronously.
|
|
2. Setup hooks for updating the cache, and the org-roam buffer."
|
|
(unless org-roam-cache
|
|
(org-roam--build-cache-async))
|
|
(add-hook 'post-command-hook #'org-roam--maybe-update-buffer nil t)
|
|
(add-hook 'after-save-hook #'org-roam--update-cache))
|
|
|
|
(defun org-roam--disable ()
|
|
"Disable org-roam updating for file.
|
|
|
|
1. Remove hooks for updating the cache, and the org-roam buffer."
|
|
(remove-hook 'post-command-hook #'org-roam--maybe-update-buffer)
|
|
(remove-hook 'after-save-hook #'org-roam--update-cache))
|
|
|
|
(defun org-roam--maybe-update-buffer ()
|
|
"Update `org-roam-buffer' with the necessary information.
|
|
This needs to be quick/infrequent, because this is run at
|
|
`post-command-hook'."
|
|
(with-current-buffer (window-buffer)
|
|
(when (and (get-buffer org-roam-buffer)
|
|
(buffer-file-name (current-buffer))
|
|
(file-exists-p (file-truename (buffer-file-name (current-buffer))))
|
|
(not (string= org-roam-current-file
|
|
(file-truename (buffer-file-name (current-buffer))))))
|
|
(org-roam-update (file-truename (buffer-file-name (window-buffer)))))))
|
|
|
|
(define-minor-mode org-roam-mode
|
|
"Global minor mode to automatically update the org-roam buffer."
|
|
:require 'org-roam
|
|
(if org-roam-mode
|
|
(org-roam--maybe-enable)
|
|
(org-roam--disable)))
|
|
|
|
;;; Building the Graphviz graph
|
|
(defun org-roam-build-graph ()
|
|
"Build graphviz graph output."
|
|
(let ((forward-links (plist-get org-roam-cache :forward)))
|
|
(with-temp-buffer
|
|
(insert "digraph {\n")
|
|
(mapcar (lambda (file)
|
|
(insert
|
|
(format " \"%s\" [URL=\"roam://%s\"];\n"
|
|
(org-roam--get-id file)
|
|
file)))
|
|
(org-roam--find-all-files))
|
|
(maphash
|
|
(lambda (from-link to-links)
|
|
(dolist (to-link to-links)
|
|
(insert (format " \"%s\" -> \"%s\";\n"
|
|
(org-roam--get-id from-link)
|
|
(org-roam--get-id to-link))))
|
|
)
|
|
forward-links)
|
|
(insert "}")
|
|
(buffer-string))))
|
|
|
|
(defun org-roam-show-graph ()
|
|
"Generate the org-roam graph in SVG format, and display it using `org-roam-graph-viewer'."
|
|
(interactive)
|
|
(unless org-roam-graphviz-executable
|
|
(setq org-roam-graphviz-executable (executable-find "dot")))
|
|
(unless org-roam-graphviz-executable
|
|
(user-error "Can't find graphviz executable. Please check if it is in your path"))
|
|
(declare (indent 0))
|
|
(let ((temp-dot (expand-file-name "graph.dot" temporary-file-directory))
|
|
(temp-graph (expand-file-name "graph.svg" temporary-file-directory))
|
|
(graph (org-roam-build-graph)))
|
|
(with-temp-file temp-dot
|
|
(insert graph))
|
|
(call-process org-roam-graphviz-executable nil 0 nil temp-dot "-Tsvg" "-o" temp-graph)
|
|
(call-process org-roam-graph-viewer nil 0 nil temp-graph)))
|
|
|
|
|
|
(provide 'org-roam)
|
|
|
|
;;; org-roam.el ends here
|
|
|
|
;; Local Variables:
|
|
;; outline-regexp: ";;;+ "
|
|
;; End:
|