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org-roam-graph.el
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;;; org-roam-graph.el --- Graphing API -*- 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: 1.2.2
;; 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 graphing functionality for org-roam.
;;
;;; Code:
(require 'xml) ;xml-escape-string
(require 's) ;s-truncate, s-replace
(require 'org-roam-macs)
(require 'org-roam-db)
;;;; Declarations
(defvar org-roam-directory)
(defvar org-roam-mode)
(declare-function org-roam--org-roam-file-p "org-roam")
(declare-function org-roam--path-to-slug "org-roam")
(declare-function org-roam-mode "org-roam")
;;;; Options
(defcustom org-roam-graph-viewer (executable-find "firefox")
"Method to view the org-roam graph.
It may be one of the following:
- a string representing the path to the executable for viewing the graph.
- a function accepting a single argument: the graph file path.
- nil uses `view-file' to view the graph."
:type '(choice
(string :tag "Path to executable")
(function :tag "Function to display graph" eww-open-file)
(const :tag "view-file"))
:group 'org-roam)
(defcustom org-roam-graph-executable "dot"
"Path to graphing executable, or its name."
:type 'string
:group 'org-roam)
(defcustom org-roam-graph-extra-config nil
"Extra options passed to graphviz.
Example:
'((\"rankdir\" . \"LR\"))"
:type '(alist)
:group 'org-roam)
(defcustom org-roam-graph-node-extra-config
'(("shape" . "underline")
("style" . "rounded,filled")
("fillcolor" . "#EEEEEE")
("color" . "#C9C9C9")
("fontcolor" . "#111111"))
"Extra options for graphviz nodes.
Example:
'((\"color\" . \"skyblue\"))"
:type '(alist)
:group 'org-roam)
(defcustom org-roam-graph-edge-extra-config
'(("color" . "#333333"))
"Extra options for graphviz edges.
Example:
'((\"dir\" . \"back\"))"
:type '(alist)
:group 'org-roam)
(defcustom org-roam-graph-edge-cites-extra-config '(("color" . "red"))
"Extra options for graphviz edges for citation links.
Example:
'((\"dir\" . \"back\"))"
:type '(alist)
:group 'org-roam)
(defcustom org-roam-graph-max-title-length 100
"Maximum length of titles in graph nodes."
:type 'number
:group 'org-roam)
(defcustom org-roam-graph-shorten-titles 'truncate
"Determines how long titles appear in graph nodes.
Recognized values are the symbols `truncate' and `wrap', in which
cases the title will be truncated or wrapped, respectively, if it
is longer than `org-roam-graph-max-title-length'.
All other values including nil will have no effect."
:type '(choice
(const :tag "truncate" truncate)
(const :tag "wrap" wrap)
(const :tag "no" nil))
:group 'org-roam)
(defcustom org-roam-graph-exclude-matcher nil
"Matcher for excluding nodes from the generated graph.
Any nodes and links for file paths matching this string is
excluded from the graph.
If value is a string, the string is the only matcher.
If value is a list, all file paths matching any of the strings
are excluded."
:type '(choice
(string :tag "Matcher")
(list :tag "Matchers"))
:group 'org-roam)
;;;; Functions
(defun org-roam-graph--expand-matcher (col &optional negate where)
"Return the exclusion regexp from `org-roam-graph-exclude-matcher'.
COL is the symbol to be matched against. if NEGATE, add :not to sql query.
set WHERE to true if WHERE query already exists."
(let ((matchers (pcase org-roam-graph-exclude-matcher
('nil nil)
((pred stringp) `(,(concat "%" org-roam-graph-exclude-matcher "%")))
((pred listp) (mapcar (lambda (m)
(concat "%" m "%"))
org-roam-graph-exclude-matcher))
(_ (error "Invalid org-roam-graph-exclude-matcher"))))
res)
(dolist (match matchers)
(if where
(push :and res)
(push :where res)
(setq where t))
(push col res)
(when negate
(push :not res))
(push :like res)
(push match res))
(nreverse res)))
(defun org-roam-graph--dot-option (option &optional wrap-key wrap-val)
"Return dot string of form KEY=VAL for OPTION cons.
If WRAP-KEY is non-nil it wraps the KEY.
If WRAP-VAL is non-nil it wraps the VAL."
(concat wrap-key (car option) wrap-key
"="
wrap-val (cdr option) wrap-val))
(defun org-roam-graph--dot (node-query)
"Build the graphviz dot string for NODE-QUERY.
The Org-roam database titles table is read, to obtain the list of titles.
The links table is then read to obtain all directed links, and formatted
into a digraph."
(org-roam-db--ensure-built)
(org-roam--with-temp-buffer nil
(let* ((nodes (org-roam-db-query node-query))
(edges-query
`[:with selected :as [:select [file] :from ,node-query]
:select :distinct [to from] :from links
:where (and (in to selected) (in from selected))])
(edges-cites-query
`[:with selected :as [:select [file] :from ,node-query]
:select :distinct [file from]
:from links :inner :join refs :on (and (= links:to refs:ref)
(= links:type "cite")
(= refs:type "cite"))
:where (and (in file selected) (in from selected))])
(edges (org-roam-db-query edges-query))
(edges-cites (org-roam-db-query edges-cites-query)))
(insert "digraph \"org-roam\" {\n")
(dolist (option org-roam-graph-extra-config)
(insert (org-roam-graph--dot-option option) ";\n"))
(dolist (attribute '("node" "edge"))
(insert (format " %s [%s];\n" attribute
(mapconcat (lambda (var)
(org-roam-graph--dot-option var nil "\""))
(symbol-value
(intern (concat "org-roam-graph-" attribute "-extra-config")))
","))))
(dolist (node nodes)
(let* ((file (xml-escape-string (car node)))
(title (or (cadr node)
(org-roam--path-to-slug file)))
(shortened-title (pcase org-roam-graph-shorten-titles
(`truncate (s-truncate org-roam-graph-max-title-length title))
(`wrap (s-word-wrap org-roam-graph-max-title-length title))
(_ title)))
(shortened-title (org-roam-string-quote shortened-title))
(title (org-roam-string-quote title))
(node-properties
`(("label" . ,shortened-title)
("URL" . ,(concat "org-protocol://roam-file?file=" (url-hexify-string file)))
("tooltip" . ,(xml-escape-string title)))))
(insert
(format " \"%s\" [%s];\n" file
(mapconcat (lambda (n)
(org-roam-graph--dot-option n nil "\""))
node-properties ",")))))
(dolist (edge edges)
(insert (apply #'format `(" \"%s\" -> \"%s\";\n"
,@(mapcar #'xml-escape-string edge)))))
(insert (format " edge [%s];\n"
(mapconcat #'org-roam-graph--dot-option
org-roam-graph-edge-cites-extra-config ",")))
(dolist (edge edges-cites)
(insert (apply #'format `(" \"%s\" -> \"%s\";\n"
,@(mapcar #'xml-escape-string edge)))))
(insert "}")
(buffer-string))))
(defun org-roam-graph--build (&optional node-query callback)
"Generate a graph showing the relations between nodes in NODE-QUERY.
Execute CALLBACK when process exits successfully.
CALLBACK is passed the graph file as its sole argument."
(unless (stringp org-roam-graph-executable)
(user-error "`org-roam-graph-executable' is not a string"))
(unless (executable-find org-roam-graph-executable)
(user-error (concat "Cannot find executable \"%s\" to generate the graph. "
"Please adjust `org-roam-graph-executable'")
org-roam-graph-executable))
(let* ((node-query (or node-query
`[:select [file title] :from titles
,@(org-roam-graph--expand-matcher 'file t)
:group :by file]))
(graph (org-roam-graph--dot node-query))
(temp-dot (make-temp-file "graph." nil ".dot" graph))
(temp-graph (make-temp-file "graph." nil ".svg")))
(org-roam-message "building graph")
(make-process
:name "*org-roam-graph--build-process*"
:buffer "*org-roam-graph--build-process*"
:command `(,org-roam-graph-executable ,temp-dot "-Tsvg" "-o" ,temp-graph)
:sentinel (when callback
(lambda (process _event)
(when (= 0 (process-exit-status process))
(funcall callback temp-graph)))))))
(defun org-roam-graph--open (file)
"Open FILE using `org-roam-graph-viewer' with `view-file' as a fallback."
(pcase org-roam-graph-viewer
((pred stringp)
(if (executable-find org-roam-graph-viewer)
(condition-case err
(call-process org-roam-graph-viewer nil 0 nil file)
(error (user-error "Failed to open org-roam graph: %s" err)))
(user-error "Executable not found: \"%s\"" org-roam-graph-viewer)))
((pred functionp) (funcall org-roam-graph-viewer file))
('nil (view-file file))
(_ (signal 'wrong-type-argument `((functionp stringp null) ,org-roam-graph-viewer)))))
(defun org-roam-graph--build-connected-component (file &optional max-distance callback)
"Build a graph of nodes connected to FILE.
If MAX-DISTANCE is non-nil, limit nodes to MAX-DISTANCE steps.
CALLBACK is passed to `org-roam-graph--build'."
(let* ((file (expand-file-name file))
(files (or (if (and max-distance (>= max-distance 0))
(org-roam-db--links-with-max-distance file max-distance)
(org-roam-db--connected-component file))
(list file)))
(query `[:select [file title]
:from titles
:where (in file [,@files])]))
(org-roam-graph--build query callback)))
;;;; Commands
;;;###autoload
(defun org-roam-graph (&optional arg file node-query)
"Build and possibly display a graph for FILE from NODE-QUERY.
If FILE is nil, default to current buffer's file name.
ARG may be any of the following values:
- nil show the graph.
- `\\[universal-argument]' show the graph for FILE.
- `\\[universal-argument]' N show the graph for FILE limiting nodes to N steps.
- `\\[universal-argument] \\[universal-argument]' build the graph.
- `\\[universal-argument]' - build the graph for FILE.
- `\\[universal-argument]' -N build the graph for FILE limiting nodes to N steps."
(interactive "P")
(unless org-roam-mode (org-roam-mode))
(let ((file (or file (buffer-file-name (buffer-base-buffer)))))
(unless (or (not arg) (equal arg '(16)))
(unless file
(user-error "Cannot build graph for nil file. Is current buffer visiting a file?"))
(unless (org-roam--org-roam-file-p file)
(user-error "\"%s\" is not an org-roam file" file)))
(pcase arg
('nil (org-roam-graph--build node-query #'org-roam-graph--open))
('(4) (org-roam-graph--build-connected-component file nil #'org-roam-graph--open))
((pred integerp) (org-roam-graph--build-connected-component file (abs arg) (when (>= arg 0) #'org-roam-graph--open)))
('(16) (org-roam-graph--build node-query))
('- (org-roam-graph--build-connected-component file))
(_ (user-error "Unrecognized ARG: %s" arg)))))
(provide 'org-roam-graph)
;;; org-roam-graph.el ends here