HASSL v0.3.0 — Modular Automations, Packages & Schedule Sensors
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## 🎉 HASSL v0.3.0 — Modular Automations, Packages & Schedule Sensors Hey folks 👋 I’m excited to share **HASSL v0.3.0**, the newest...
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The original was posted on /r/homeassistant by /u/adanowit on 2025-10-20 21:41:02+00:00.

🎉 HASSL v0.3.0 — Modular Automations, Packages & Schedule Sensors

Hey folks 👋

I’m excited to share HASSL v0.3.0, the newest release of the Home Assistant Simple Scripting Language — a human-friendly DSL that compiles into loop-safe, deterministic, and composable automations for Home Assistant.

If you haven’t seen it before, HASSL lets you replace long YAML automations with something that looks more like plain English:

alias motion = binary\_sensor.landing\_motion
alias lux = sensor.landing\_lux
alias light = light.landing\_main

schedule wake\_hours:
 enable from 08:00 until 19:00;

rule motion\_light:
 schedule use wake\_hours;
 if (motion && lux < 50)
 then light = on;
 wait (!motion for 10m) light = off

That compiles into a full Home Assistant package with helpers, scripts, context tracking, and restart-safe schedules — no YAML editing needed.

🆕 What’s new in v0.3.0

🧩 Modular packages & imports

  • You can now organize automations across multiple files: hassl package std.shared alias light = light.kitchen schedule wake_hours: enable from 07:00 until 22:00;
 package home.living
 import std.shared.\*

rule motion\_light:
 schedule use wake\_hours;
 if (motion && lux < 50)
 then light = on

→ The compiler wires it all up automatically across packages.

🔒 Private visibility

  • Use private alias or private schedule to keep symbols scoped to one package.

🕒 Schedule sensors

  • Schedules now emit template binary_sensors like

binary_sensor.hassl_schedule_std_shared_wake_hours_active

that auto-update on startup and across sunrise/sunset.

⚙️ Smart semicolons

  • Semicolons are now required only inside then blocks and schedule clause lists — not everywhere.

🧠 Cleaner HA templates

  • Schedule sensors now output pure Jinja expressions (no {% %} inside {{ }}).

💻 Emacs major mode!

  • Syntax highlighting, indentation, and context-aware semicolons for HASSL files (hassl-mode.el).

📦 Output snapshot

HASSL compiles each .hassl file into a self-contained HA package:

File Purpose
helpers_<pkg>.yaml Defines all input_boolean, input_text, input_number helpers
scripts_<pkg>.yaml Context-stamped writer scripts
rules_bundled_<pkg>.yaml All rules, waits, and gates
schedules_<pkg>.yaml Template schedule sensors (new in v0.3.0)

Everything drops directly into /config/packages/.

🔧 Install or upgrade

bash pip install -U hassl

Or install from source: bash git clone https://github.com/adanowitz/hassl.git cd hassl pip install -e .

❤️ Why it matters

HASSL isn’t just another templating layer — it’s a small compiler that turns structured, readable logic into loop-safe YAML. It stamps context IDs, reuses schedules, and stays compatible with every HA version that supports template sensors.

You can think of it as “TypeScript for Home Assistant YAML.”

🔗 Links

Happy automating, and huge thanks to everyone testing and contributing!

Questions, bugs, or feature ideas? Drop them here or open an issue on GitHub.