Intent creation: display content (show) + named RTTTL melodies

[moellere]

Two intent-creation features closing the "component added, nothing happens" gap: displays that actually display, and buzzers that play named melodies — both declarative in design.json, both lowered by the generator, no hand-written lambdas required.

Display content: params.show. A widget list on any display component:

"show": [
  {"kind": "text", "text": "wirestudio"},
  {"kind": "value", "source": "climate", "channel": "temperature", "label": "T", "format": "%.1f", "unit": "C"},
  {"kind": "time", "format": "%H:%M"}
]

Lowered per display dialect (a new esphome.display_dialect library field): pixel displays (ssd1306, ili9xxx, st7789) get an automatic font: block (gfonts://Roboto) and y-stepped printf lines; character LCDs (lcd_pcf8574) print into rows; digit displays (tm1637, max7219) render one value. Value widgets bind other components' readings by id convention — single-value sensors publish as <component>, multi-channel as <component>_<channel> — and 20 sensor templates now emit those ids. Time widgets bring their own time: block. An explicit lambda_ always wins. New show_* validation warnings explain unknown sources, channels, and widget kinds.

Named RTTTL melodies. The rtttl component gains capability: play/stop; an automation action can say args: {song: "doorbell"} and the lowering substitutes the full RTTTL string from a curated eight-melody map (GET /intent/melodies); args: {rtttl: "..."} stays as the raw escape hatch. Unknown songs warn (automation_unknown_song) and drop the action rather than emit a broken play; a play with neither arg warns too.

Dogfooding: the oled example renders its clock through show (replacing its hand lambda, font, and time blocks), and co2-display gains a piezo that plays the alarm melody when CO2 crosses 1200ppm — via a new co2 capability channel + on_value_range passthrough on mhz19. Both pass real esphome config.

Goldens regenerated across the board (the full-regen also caught the kitchen-scale ASCII up to the earlier SSD1306→SH1106 rename, and adds goldens for examples that never had them). Validation: all 68 examples pass the gate under 2026.6.5; 1119 Python tests (8 new) pass — the 2 local failures are the known root-sandbox chmod tests, green in CI.

Follow-up candidates: a show widget builder in the inspector UI, and melody preview in the automation editor.

🤖 Generated with Claude Code

https://claude.ai/code/session_01VLucY2SKuBDPFaDAJnnYs1

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