Text processing

[dhardy]

This is not a trivial subject; it requires several steps:

• optional translation step
• decoding markup (from Markdown, simplified HTML, etc.)
• font loading (handled by rusttype)
• font association (currently we only support a single font)
• conversion from unicode to glyphs (handled by rusttype)
• line-breaking (handled by glyph_brush_layout)
• real font shaping
• alignment
• justified alignment
• caching and rendering (glyph_brush)
• extraction of text metrics (use of line height for layouts and text highlighting)
• text position → screen position translation (drawing edit bar)
• screen position → text position translation (mouse selection/positioning)
• clipboard interaction
• rich-text clipboard support
• efficient editing for large documents: Efficient editing for larger texts kas-text#15

Currently we use glyph_brush (part of rusttype) to achieve a sub-set of the above.

[dhardy]

We may wish to use ropey, which provides efficient buffer editing, line tracking and character indexes.

[nilsmartel]

There is an ongoing discussion about just this topic in the druid community.
I think everyone would benefit from you sharing your thoughts with them.

On https://xi.zulipchat.com one can find their community discussions

[dhardy]

Iced also has many of the same issues. I thought though Druid was using Pango? Anyway, I can't look into this now.