ezu-cli 0.4.2

Command-line renderer for the Ezu Style Spec
ezu-cli-0.4.2 is not a library.

ezu-cli

Command-line renderer for the Ezu Style Spec — the ezu binary of the ezu workspace.

cargo install ezu-cli

Point it at any style (URL or local path) and it renders PNGs. A style declares its own tile sources in a sources block (MVT, PMTiles, raster DEM, RGBA raster, GeoJSON), so most commands need nothing but a --style and a tile address; CLI flags override anything declared there for one-off swaps.

Commands

Command What it does
ezu tile Render a single z/x/y tile to PNG (or lossless WebP via --out tile.webp / --format)
ezu bbox Stitch the tiles covering a lon/lat box at one zoom into a single image
ezu tiles Bulk-render an XYZ pyramid into <out>/<z>/<x>/<y>.png over a zoom range, --concurrency tiles at a time
ezu check Validate a style — parse + build graph + resolve assets. Exits non-zero on error, so it drops into a pre-commit hook or CI step. --no-fetch stays offline (parse + graph only)
ezu translate Lower a MapLibre GL style into an ezu recipe via ezu-translate. --font "NAME=SOURCE" maps a fontstack entry to a real font; skipped or approximated layers are reported on stderr
ezu graph Emit a Mermaid graph LR diagram of the style's node dependencies
ezu serve Live editor + tile server (below)

Global flags: --verbose / -v turns on per-node debug logs from the evaluator (op name, cache hit/miss, output shape, eval duration). Render commands share --style, --assets-dir, --pmtiles / --mvt, --overzoom-levels, and repeatable --param NAME=VALUE overrides validated against the style's params declarations.

# Single tile — the reference styles bundle their own `sources` block,
# so no `--pmtiles` / `--mvt` is needed.
ezu tile --style crates/ezu/examples/styles/watercolor.json \
  --tile 13/7276/3225 --out tile.png

ezu bbox --style URL_OR_PATH \
  --bbox 139.74,35.65,139.78,35.69 --zoom 13 --out tokyo.png

ezu tiles --style URL_OR_PATH \
  --bbox 139.74,35.65,139.78,35.69 --min-zoom 10 --max-zoom 14 --out pyramid

ezu check style.json --no-fetch
ezu translate maplibre-style.json --out recipe.json

# Parameter overrides, validated against the style's `params` block.
ezu tile --style watercolor.json --tile 13/7276/3225 \
  --param 'paper=#ffe0f0' --param softness=2 --out tile.png

ezu serve — live editor + tile server

ezu serve                                                # default example style
ezu serve crates/ezu/examples/styles/pencil-sketch.json  # a specific style
ezu serve https://example.com/style.json                 # or fetch one over http(s)
# Open http://127.0.0.1:8080

The server hosts the browser editor at /, rendered tiles at /tiles/{z}/{x}/{y}.{png,webp}, raw MVT bytes at /mvt/{z}/{x}/{y}, and a registry-derived JSON Schema at /schemas/ezu-style.json — the same schema the editor validates against as you type, so custom ops get autocomplete for free. /style/params serves the current style's parameter schema and /style/attribution the merged source attributions.

The editor (MapLibre GL based) supports:

  • Open / URL / Save — load a style from a local file or http(s) URL, save the current buffer as <name>.json. Open on Chromium browsers uses the File System Access API so Save writes back in place.
  • Apply with ⌘↵ / Ctrl+↵ (works anywhere on the page).
  • Live preview — when enabled, auto-applies on every keystroke that parses + schema-validates + server-validates clean.
  • External-edit reload — when launched with a local path (ezu serve foo.json), the server polls the file and pushes Server-Sent Events on every change. The editor swaps the buffer silently when clean, or surfaces a Reload banner when the user has unsaved edits. The ↻ HH:MM:SS indicator in the toolbar shows the last auto-reload. On Chromium, the same watch also runs against files opened via the in-browser file picker. Opening a different file via Open… / URL… detaches the server watch for that session.
  • Params panel — controls generated from the style's params declarations (sliders for bounded numbers, color pickers, toggles). Adjustments ride the tile requests as query-string overrides and re-render live without touching the style text; reset returns to the declared defaults. See parametric styles.
  • Source MVT inspector — toggle a vector overlay of the underlying MVT, with per-layer ON/OFF and click-to-inspect feature properties. Layers are discovered from the tile at the map center; pan/zoom rescans automatically.
  • Tile grid + zoom indicator — toggle a z/x/y boundary overlay (drawn per tile via maplibregl.addProtocol), and read the live zoom value (click to copy z @ lat,lng).

A self-contained ezu-wasm demo page and the routes it needs (including the COOP/COEP headers the threads build requires) ship with ezu serve too.

License

MIT or Apache-2.0, at your option.