d2-mode

A d2 extension for Emacs. This was heavily inspired of Mermaid Mode.

Status: Alpha. Available on Melpa.

It works you can use this to render d2 in both your browser and in an emacs buffer. See Bugs & Issues for known issues.

Table of Contents

• d2-mode
• Why D2
• Installation
• Usage
• Customization
• d2 binary location
• Output format
• Temp directory
• Key bindings
• Bonus
• Roadmap
• Bugs & Issues
• Contributors

Why D2

Text to graph diagrams are awesome. I used Mermaid.js all the time and it was fantastic, but there were a few things it couldn't do so I wanted to expand my options.

Some things that I've noticed d2 has some interesting support in:

1. More themes
2. Code Blocks
3. More visual customization
4. More graph support
5. Autoformat

Learn more about d2 here

Installation

1. Load the d2-mode.el file or install from melpa: M-x package-install d2-mode
2. Install d2 binary from the d2 project if you plan to compile graphs in Emacs

Usage

C-c C-c - compile current file to an image
C-c C-f - compile given file to an image
C-c C-b - compile current buffer to an image
C-c C-r - compile current region to an image
C-c C-o - open in the live editor
C-c C-d - open the official doc

Note: All compile commands will open the output in a buffer to view the resulting image.

Customization

d2 binary location

You can specify the location of d2 with the variable d2-location, the default assumes you have the binary in your PATH (and for that you probably want/need to install d2).

Output format

You can specify png or svg output format by putting this in your init.el file:

(setq d2-output-format "<OUTPUT_FORMAT")

Options are:

• .png
• .svg

Default is SVG.

Temp directory

By default d2-tmp-dir points to \tmp\. Feel free to set it to a more appropriate location that works for you (e.g. on windows).

Key bindings

To customize the key bindings put this into your init.el ...

(defvar d2-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "C-c C-c") 'd2-compile)
    (define-key map (kbd "C-c C-f") 'd2-compile-file)
    (define-key map (kbd "C-c C-b") 'd2-compile-buffer)
    (define-key map (kbd "C-c C-r") 'd2-compile-region)
    (define-key map (kbd "C-c C-h") 'd2-compile-file-and-browse)
    (define-key map (kbd "C-c C-j") 'd2-compile-buffer-and-browse)
    (define-key map (kbd "C-c C-k") 'd2-compile-region-and-browse)
    (define-key map (kbd "C-c C-o") 'd2-open-browser)
    (define-key map (kbd "C-x C-o") 'd2-view-current-svg)
    (define-key map (kbd "C-c C-d") 'd2-open-doc)
    map))

Bonus

See the snippets folder for yas snippets. Start making d2 graphs today!

Roadmap

• Even better syntax highlighting and formatting
• Watch mode support

Bugs & Issues

• SVG's have issues rending in emacs sometimes. See #13 and #8 for more details. You can use the *browse commands to render it directly in your browser instead!

Feel free to open an issue and or contribute to this repo over a PR!

Contributors

We thank anyone that decides to contribute to this repository and encourage contributions.

Also thank you to @suliveevil for bringing up issues.