From 4fccc56fff45495397773b65e883c7d5ab7d478f Mon Sep 17 00:00:00 2001
From: Nicolas Petton
Date: Mon, 1 Mar 2021 21:23:25 +0100
Subject: Add support for unlinked references

* nroam-unlinked.el: New file.
* nroam.el: Setup unlinked references section.
---
 nroam-unlinked.el | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 nroam.el          |  2 ++
 2 files changed, 84 insertions(+)
 create mode 100644 nroam-unlinked.el

diff --git a/nroam-unlinked.el b/nroam-unlinked.el
new file mode 100644
index 0000000..3cee565
--- /dev/null
+++ b/nroam-unlinked.el
@@ -0,0 +1,82 @@
+;;; nroam-unlinked.el --- Unlinked references section for nroam.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021  Nicolas Petton
+
+;; Author: Nicolas Petton <nico@petton.fr>
+;; URL: https://github.com/NicolasPetton/nroam
+;; Keywords: convenience, outlines
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "26.1") (org-roam "1.2.3"))
+
+;; 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 of the License, 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This library provides an unlinked references nroam section for org-roam
+;; buffers.
+
+;;; Code:
+(require 'org-roam)
+(require 'nroam-utils)
+(declare-function nroam-register-section "nroam.el")
+(declare-function nroam-update "nroam.el")
+
+(defvar-local nroam-unlinked-show-references nil
+  "When non-nil, show unlinked references for the current buffer.")
+
+(defun nroam-unlinked-register-section ()
+  "Register `nroam-unlinked-section' as a section in nroam."
+  (nroam-register-section #'nroam-unlinked-section))
+
+(defun nroam-unlinked-section ()
+  "Insert org-roam unlinked references for the current buffer."
+  (nroam-unlinked--insert-heading)
+  (if nroam-unlinked-show-references
+      (nroam-unlinked--insert-references)
+    (nroam-unlinked--insert-toggle-button)))
+
+(defun nroam-unlinked--insert-heading ()
+  "Insert the heading for unlinked references."
+  (insert "* Unlinked references\n"))
+
+(defun nroam-unlinked--insert-references ()
+  "Insert unlinked references for the current buffer."
+  (let (content)
+    (save-window-excursion
+      (org-roam-unlinked-references)
+      (let ((buf (current-buffer)))
+        (goto-char (point-min))
+        (search-forward "* Unlinked References\n" nil t)
+        (setq content (buffer-substring (point) (point-max)))
+        (kill-buffer buf)))
+    (insert content)))
+
+(defun nroam-unlinked--insert-toggle-button ()
+  "Insert a button to show unlinked references."
+  (let ((beg (point)))
+    (insert "[Show unlinked references]")
+    (make-text-button beg (point) 'action #'nroam-unlinked--show-references)
+    (insert "\n")))
+
+(defun nroam-unlinked--show-references (&rest _)
+  "Search for and show unlinked references."
+  (let ((inhibit-read-only t)
+        (pos (point-at-bol)))
+    (setq nroam-unlinked-show-references t)
+    (nroam-update)
+    (goto-char pos)
+    (org-back-to-heading)))
+
+(provide 'nroam-unlinked)
+;;; nroam-unlinked.el ends here
diff --git a/nroam.el b/nroam.el
index bd96fd8..46bd5bf 100644
--- a/nroam.el
+++ b/nroam.el
@@ -42,6 +42,7 @@
 
 (require 'nroam-utils)
 (require 'nroam-backlinks)
+(require 'nroam-unlinked)
 
 (defcustom nroam-sections nil
  "List of functions to be called to insert sections in nroam buffers."
@@ -200,6 +201,7 @@ Make the region inserted by BODY read-only, and marked with
       (goto-char point))))
 
 (nroam-backlinks-register-section)
+(nroam-unlinked-register-section)
 
 (provide 'nroam)
 ;;; nroam.el ends here
-- 
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