v0.2.18

Mermaid source drawn as SVG by the new bezel-mermaid, without gpui, and the document model builds without gpui.

New

• bezel-mermaid (mermaid) turns Mermaid source into SVG, a port of Pele 1.6.0: render(source, &Options, &host) answers a Drawing (kind, svg, width, height, links), parse(source, &Options) a Parsed whose model serializes as Pele's, render_parsed, detect_type and supports. Errors carry Pele's messages, a Code, and the line, column and snippet. The host is a Host, which answers text widths and icon markup; Metrics is one with Arial's advances and no icons. Options holds Pele's render options with their defaults. Colours and fonts are --bezel-* CSS variables. It builds without gpui, for wasm32-unknown-unknown too. This release draws info, pie, xychart, quadrantChart, radar, sankey, treemap, gitGraph, packet, treeView, mindmap, railroad, venn, ishikawa, gantt, journey, kanban, timeline, classDiagram, flowchart, stateDiagram, erDiagram, requirementDiagram, sequenceDiagram, cynefin, wardley, eventmodeling, C4, architecture, block, agentflow, usecase and swimlane.
• mermaid::layout holds the layered, compound and lane layouts every graph diagram is placed by, and mermaid::svg the shapes, edge routes, markers and cluster titles they are drawn with; mermaid::diagrams::common the tokenizer, label fitting and outline grammar the diagram types share.
• On benches/mermaid.rs against Pele 1.6.0 in Node 26, on an Apple M1, every case renders at least as fast as Pele at opt-level = 3, 1.06× to 2.7× (the flowchart docs in 2.1 ms against 3.7 ms); at the release profile's opt-level = "z" it is 0.70× of Pele on the geometric mean. cargo bench -p bezel-mermaid --bench mermaid, with --profile release for the latter, and crates/mermaid/tests/mermaid/pele/compare.mjs reproduce it.
• Options::colors takes a Colors (each an Rgba) for a renderer without CSS custom properties: the SVG names those colours and every other variable's value in place of each var(…), computes its color-mix, and keeps rectangles' radii in rx. markdown::fence::fence_note puts a note under a fence's code, NOTE_SELECTOR on it.

Changed

• ui::fonts::add hands fonts to gpui's text system and, in a browser, to ui::fonts::database, the fonts SVG is laid out and drawn in; natively that is the system's fonts. ui::register_fonts goes through it.
• A ```mermaid fence lays out and rasterizes its diagram with ui::fonts::database instead of gpui's SVG renderer, so in a browser its labels are drawn in the app's fonts rather than left out, and natively in the face they were measured in.
• bezel-syntax-std is merged into bezel-syntax: syntax_std::install and LANGS are syntax::grammars::install and syntax::grammars::LANGS, and the rust, python, typescript, json, go, bash and toml features, on by default, are bezel-syntax's.
• bezel-canvas-core is merged into bezel-canvas: its modules are canvas::change, clip, contain, drag, handle, json_canvas, layout, mindmap, model, paint, path and snap. diagram, the read-only painter the mermaid fences used, is gone.
• bezel-markdown's gpui, theme and ui are behind its gpui feature, on by default. Without it the crate is doc, parse, serialize, select, edit, quote and synced, and builds for wasm32-unknown-unknown; Cursor::span, the mark and highlight paints and everything that renders need the feature.
• bezel-markdown's gpui modules are grouped: fence (was block, with fence::highlight, fence::mermaid, and fence_panel, fence_band, fence_note and NOTE_SELECTOR from render), paint (paint::comment, paint::find, and paint::marks for the mark and highlight paints that were in marks), app (app::layout, app::link, app::picture, app::preview and app::typography, beside AppExt), source::style (was source_style) and render::selectable (was selectable). The names re-exported at the crate root are unchanged.
• markdown::fence::mermaid is the fence alone: Zoom, LANGUAGE and DIAGRAM_SELECTOR. Its mermaid feature turns on gpui.
• A ```mermaid fence is drawn by bezel-mermaid, every diagram type it draws, painted from its SVG by gpui's SVG renderer at the fence's scale on screen, in the theme's colours. Labels are measured in the system faces that renderer draws them in: the theme's fonts where the system has a regular and a bold face of them, else the first of Helvetica Neue, Segoe UI, Roboto and other common families (Menlo, Consolas … for mono). The first fence drawn loads the system's font list, about a quarter of a second. Source that does not draw shows as code with the error under it. Gone: canvas_core::mermaid, chart::mermaid and their mermaid features, markdown::charts, and the mermaid-rs-renderer dependency.