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Tactility/.claude/rules/coding-style.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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Coding Style

Two conventions coexist; which one to use depends on the project layer:

  • C code: lower_snake_case for files, functions, variables. UpperCamelCase for types. Files in source/, include/, private/ directories.
  • C++ code: UpperCamelCase for files and types. lowerCamelCase for functions. Files in Source/, Include/, Private/ directories.

For projects that emit C headers and have a C++ implementation file: the internal C++ function naming should be snake_case.

Formatting is enforced by .clang-format (LLVM-based, 4-space indent, no column limit). Never throw exceptions — use return types for error handling. Use enum class over plain enum when writing C++ code. Do not add redundant null checks for parameters with an explicit non-null precondition.

Code Comments (important!):

  • Should be minimal, but must contain critical information.
  • Must not contain interjections " - " or ";"
  • Must not explain how code was before, or how it was changed.
  • Must avoid explaining what was not implemented.
  • Must not refer to designs of other subsystems.