The Denote-Explorer package provides auxiliary functions to maintain and explore your collection of Denote files. Denote-Explore provides three groups of Emacs commands:

1. Summary statistics: Count and visualise notes, attachments and keywords.
2. Random walks: Generate new ideas using serendipity.
3. Janitor: Manage your denote collection.
4. Knowledge graphs: Visualise your Denote network as a network graph.

Read the Denote-Explorer manual for a comprehensive explanation of all functionality (C-h R denote-explore).

Visualising networks of Denote files with SVG or PDF files will require the GraphViz package to be available. The D3.js visualisation type downloads an external JavaScript file from d3js.org.

Denote-Explore package is available on MELPA and is easily installed with the use-package macro.

The configuration below customises all available variables and binds all available commands to the C-c e prefix. Modify this configuration to suit your needs, as one person’s sensible defaults are another person’s nightmare. To get started you don’t need to configure anything, so (use-package denote-explore) is sufficient.

(use-package denote-explore
  :custom
  ;; Where to store network data and in which format
  (denote-explore-network-directory "<your preferred folder>")
  (denote-explore-network-filename "denote-network")
  (denote-explore-network-keywords-ignore "<keywords list>")
  (denote-explore-network-regex-ignore "<regex>")
  (denote-explore-network-format 'd3.js)
  (denote-explore-network-d3-colours 'SchemeObservable10)
  (denote-explore-network-d3-js "https://d3js.org/d3.v7.min.js")
  (denote-explore-network-d3-template "<file path>")
  (denote-explore-network-graphviz-header "<header strings>")
  (denote-explore-network-graphviz-filetype 'svg)
  :bind
  (;; Statistics
   ("C-c e s n" . denote-explore-count-notes)
   ("C-c e s k" . denote-explore-count-keywords)
   ("C-c e s e" . denote-explore-barchart-filetypes)
   ("C-c e s w" . denote-explore-barchart-keywords)
   ("C-c e s t" . denote-explore-barchart-timeline)
   ;; Random walks
   ("C-c e w n" . denote-explore-random-note)
   ("C-c e w r" . denote-explore-random-regex)
   ("C-c e w l" . denote-explore-random-link)
   ("C-c e w k" . denote-explore-random-keyword)
   ;; Denote Janitor
   ("C-c e j d" . denote-explore-duplicate-notes)
   ("C-c e j D" . denote-explore-duplicate-notes-dired)
   ("C-c e j l" . denote-explore-missing-links)
   ("C-c e j z" . denote-explore-zero-keywords)
   ("C-c e j s" . denote-explore-single-keywords)
   ("C-c e j r" . denote-explore-rename-keywords)
   ("C-c e j y" . denote-explore-sync-metadata)
   ("C-c e j i" . denote-explore-isolated-files)
   ;; Visualise denote
   ("C-c e n" . denote-explore-network)
   ("C-c e r" . denote-explore-network-regenerate)
   ("C-c e d" . denote-explore-barchart-degree)
   ("C-c e b" . denote-explore-barchart-backlinks)))

Alternatively, you can install it directly from GitHub:

(unless (package-installed-p 'denote-explore)
  (package-vc-install
   '(denote-explore
     :url "https://github.com/pprevos/denote-explore/")))

Major version numbers coincide with Denote major versions.

• Minor compatibility issues with Denote 4.1. No upgrades.

• Various bug fixes and refactoring
• Added denote-explore-random-signature function
• Add ability to ignore files by keyword for determining isolatedness (Pull request 41)
• Added denote-explore-list-keywords function (Pull request 42)

• Compatibility check with Denote 4
  • Minor update to denoter-explore-sync-metadata
  • Updated denote-explore-rename-keyword
• Clarifications in the manual
• Added error message when ‘missing’ link is not found in buffer
• Clarifications in the manual

• Fixed bug in keyword renaming function.

• Refactoring of missing links functionality
• Added table of missing file links in Denote files
• Renamed denote-explore-dead-links to denote-explore-missing-links

• Fixed issues in the manual.
• Clarified duplicate detection.
• Fixed bug in denote-explore-barchart-backlinks.
• Added denote-explore-random-regex-ignore variable to exclude files from random walks.

• Knowledge Graphs
  • New visualisation type: Sequences of Denote signatures
    • Changed GraphViz geometry for sequence graphs
  • Full rewrite of most functions.
    • Increased efficiency in detecting edges (links between files)
    • Ability to draw graphs without attachments by using the universal argument when generating and regenerating graphs
  • D3.js Visualisations
    • New slider to change the number of node labels (from none to every node)
    • Added number of isolated notes to info tooltip (when isolated nodes > 0)
• Janitor
  • New function denote-explore-dead-links to find dead links
  • Optimised single and zero keywords detection
  • Change behaviour and optimisation for denote-explore-isolated-notes
  • denote-explore-sort-keywords replaced by denote-explore-sync-metadata
  • Refactored denote-explore-rename-keyword
  • Renamed duplicate notes functions to remove double verb and UI improvements.
  • denote-explore-sync-metadata bug fix
• Statistics
  • New function denote-explore-barchart-timeline to show number of nodes and/or attachment created per year
  • The File type bar chart can also show only attachments.
  • denote-explore-barchart-degree allows text-only option
  • Added all used keywords to denote-explore-count-keywords
  • Fixed bug in random walk functions

• First version formally registered (for inclusion in Guin)
• D3.js Visualisation
  • Community graphs can filter out nodes where degree = 0 (isolated notes)
  • Preview images and PDF files in tooltips
• Updated manual
• Bug fixes
  • GraphViz network
  • D3.js file type legend colours
  • Random walk functions
• Updated code commentary
• Updated counting and related bar chart functions

• Removed dependency on R for D3.js graphs. D3 now uses a template in which a JSON file is inserted. This format is now the default.
• Fixed bugs in renaming functions
• Protection against using quotation marks in note title when visualising networks in GraphViz.
• Fixed backlinks barchart visualisation
• Updates documentation strings.

• Compatability with Denote 3.0
• Renamed barchart functions to all start with denote-explore-barchart-.
• Using universal argument with denote-explore-barchart-extensions visualises only attachment file types.
• All functions that rename files updated for compatability with Denote 3.0
• Enhanced info manual

• New functions:
  • denote-explore-backlinks-barchart to view top-n notes with backlinks
  • denote-explore-random-regex to jump to random note matching a regular expression.
  • denote-explore-identify-duplicate-notes-dired: View notes with duplicates ID in Dired.

• Fixed various compilation errors.
• Enhanced output for denote-explore-identify-duplicate-notes
• Update customization types for note ignore variables
• Updated defgroup definition and defcustom types

• Published Info mode manual
• Clarified obsolete variables and functions
• denote-explore-network-keywords no longer interactive
• Updates to Denote functions

• Geneal code refactoring with assistance from Prot
• Added ability to filter keywords network by minimum weight of edges
• Added ability for free text in denote-explore-network-graphviz-filetype
• GEXF format now includes the total degree for each node
• Enforced consistency with use of universal argument (its use will include attachments)
• denote-explore--retrieve-title deprecated. Now using Denote function.
• Updated manual with clarifications

• Fixed bugs with random links and keywords from nil file-name
• New variable denote-explore-network-regex-ignore to ignore files matching a regular expression when creating neighbourhood or community graphs.

• Network visualisation
  • SVG output includes links to source file.
  • Configure GraphViz output format with denote-explore-network-graphviz-filetype (SVG (default) or PDF advised).
  • Improved scaling of GraphViz graphics.
  • denote-explore-network-regenerate recreates the previous graph
• New functions:
  • denote-explore-isolated-notes to select Denote files without any links or backlinks.
  • denote-explore-degree-barchart draws the distribution of total number of (back)links per file (Degree distribution - Wikipedia).
• Updated functions:
  • denote-explore-rename-keyword allows renaming more than one keyword to a new version.
  • denote-explore-sync-metadata enforces renaming confirmation.
• Minor bug fixes.

• Complete rewrite of the graph visualisation functionality. Now includes three formats (JavaScript, GraphViz and GEXF) and three graph types (notes that match a regular expression, note neighbourhood and keyword graph).
• Fixed bugs in denote-explore--retrieve-title and denote-explore--retrieve-keywords.
• Enhanced function and variable documentation.

• Removed pandoc dependency in network generation.
• denote-explore-identify-duplicate-notes replaces denote-explore-identify-duplicate-identifiers. This new version either detects duplicate identifiers, or duplicate file names (using the universal argument). Comparing duplicate filenames ignores any duplicate identifiers caused by exporting Org mode files.

• Added helper function to call R script for network visualisation.
• denote-explore-dashboard.el deprecated.
• Added to MELPA.

This version is a complete rewrite of the code to improve coding quality and compatibility with internal changes since Denote version 2.2.

Also major changes to the network visualisation, which can now take a regular expression for partial networks. Most of the code is now undertaken in Emacs Lisp, which saves the network in JSON format.

The functionality for a Dashboard widget has been moved to a separate file to not enforce the requirements for those users not seeking to implement the widget.

New functionality since the previous version:

• denote-explore-identify-duplicate-identifiers: Provide a list of duplicate identifiers.
• denote-explore-single-keywords: Select a note or attachment with a keyword that is only used once.
• denote-explore-zero-keywords: Select a note or attachment without any keywords.
• denote-explore-sort-keywords: Order the keywords of all Denote notes and attachments alphabetically.
• denote-explore-rename-keyword: Rename or remove a keyword across the whole Denote collection.
• denote-explore-sync-metadata: Synchronise the filenames with the metadata for all Denote files.

Some random ideas for future development. Feel free to suggest other ideas.

• [ ] Functions to rename Denote attachments using EXIF metadata.
• [ ] Store the Denote metadata in a hash table that is updated after every modification to a Denote file for more efficient visualisation.
• [ ] Ring of previously-generated networks instead of overwriting denote-explore-network-previous
• [ ] Use org-graph-view for live neighbourhood view of the current buffer
• [ ] Community detection?
• [ ] Create a Denote widget for the Emacs Dashboard with links to statistics.