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A performant, simple, and beautiful plain-text editor written in Prosemirror.

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Dark black card with sample white text illustrating basic markup

Gem (previously called Editor) is a performant and simple plain text editor, created with Prosemirror. The design is very inpsired by Paco Coursey's "Writer".

The goods:

  • Fairly lightweight, around 65.5 kB for the whole website.
    • Can do a fair bit better here...some of the prosemirror modules can be stripped for this purpose.
  • Undo/redo.
  • Arrow key movement.
  • Basic inline markdown (bold, code, italic), although they can be a little buggy.
  • JS source is small and readable.
  • CSS source is small and readable. Uses CSS variables for styling.
  • Accessible and semantic. Each paragraph becomes a p tag, each inline style is appropriately represented.
  • Playful animated cursor :)

To run: npm run dev. The build step uses estrella to bundle/watch and serve for serving.

Please hit me up on twitter if you like it or have any ideas for features!

To do (in priority):

  • Switch to using codemirror so that syntax highlighting becomes easier to dispatch
  • Basic markdown syntax highlighting.
    • Headings
    • Bullet lists
    • Numbered lists
    • Code block
  • Code block syntax highlighting (async loading through prismjs?)
  • Cursor shape changes when marks are applied (fatter when bold, slant when italic, rectangle when code)
  • Default word-selection (when you start highlighting, it defaults to selecting the whole word your cursor is on).
  • Fix sentence-wrapping bug where it overflows sometimes (unreproducible as of yet, unless you paste in a huge text).
  • Highlight and animate selection through 3 divs: one on bottom to beginning of line, one sandwiched in b/w, and one from top to end of line
  • "Bookmarks" to leave your cursor in a position and travel back to.

Things I'm thinking of adding:

  • Table of contents generated from the headings for easy navigation?
  • Tree-sitter for incremental markdown parsing? Prosemirror plugin to wrap the wasm bundle?
  • Allow theming/setting the color variables in UI?
  • Potentially replace prosemirror-view to be more lightweight and integrate cursor and selection "natively"?
  • Share urls to save?

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A performant, simple, and beautiful plain-text editor written in Prosemirror.

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  • TypeScript 65.8%
  • CSS 16.2%
  • HTML 11.5%
  • Python 4.0%
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