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Tactility/.claude/rules/architecture-layers.md
Ken Van Hoeylandt 79d3dd4fdb
Improvements for apps, filesystems, terminal and shell (#659) 
app-module

- Apps now have support for:
  - environment variables (inherit from parent app)
  - current workdir
  - window size (when running in terminal)
- Add type aliases like `AppId` and `PackageId`
- Remove data duplication between ledger and app instance records: create `AppManifestSet`
- `AppManifest` usage safety improved: pass by value where needed, or use `AppId` instead of a manifest.

Terminal and shell

- Moved shell commands into coreutils-module as proper apps.
- Refine stack size for terminal and shell because apps now run with their own task and stack (including in-memory apps)

Platform

- Fix for listing root dir on ESP32: wrap posix directory functions and wire in file systems.
- Moved all platform-specific file system init code to platform subprojects

Other

- Fix for screenshot capture (issue with paths)
- Fixes for coreutils app correctness
- Memory optimizations (use more PSRAM where possible) in various locations such as app-module, shell and terminal.
- `ls` and `help` commands now use terminal width and show columns of data by default
- Created fs helpers at `TactilityKernel/include/tactility/filesystem/fs.h` (partially ported from `ShellFs`)
2026-09-25 08:29:27 +02:00

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Architecture: Layer Stack (bottom to top)

  • TactilityKernel — C API kernel: device/driver/module lifecycle, concurrency primitives (thread, mutex, timer, dispatcher), filesystem, logging. Header convention: <tactility/*.h> (lowercase snake_case).
  • TactilityKernelCpp — C++ extensions for TactilityKernel
  • TactilityFreeRtos — Thin C++ wrappers around FreeRTOS primitives.
  • Tactility — Main app/firmware project: contains apps, services, LVGL integration, and more.