funstx is a small command‑line tool that parses .fun source files to verify syntax without executing them. It lives alongside the fun executable in the build directory and is installed by default.

Features

  • Fast syntax checking for one or many .fun files
  • Non‑executing: only parses, never runs code
  • Clear error messages with file:line:col
  • Optional automatic fixes with --fix for common formatting/token issues
  • Suitable for batch/CI usage via exit codes

Usage

funstx [--fix] [file1.fun] [file2.fun ...]
  • Provide one or more .fun files to check.
  • Add --fix to attempt safe, automatic corrections before re‑checking.

Examples

  • Check a single file:
    • funstx examples/arrays.fun
  • Check and auto‑fix a file:
    • funstx --fix examples/arrays.fun
  • Bulk check and auto‑fix all examples (recursive):
    • find examples -type f -name '*.fun' -print0 | xargs -0 -n 50 funstx --fix

Output

  • On success: prints path/to/file.fun: OK
  • On failure: prints path/to/file.fun:line:col: syntax error: <message>

Exit codes

  • 0: All provided files parsed successfully
  • 1: At least one file failed to parse (after optional fixing)
  • 2: Incorrect usage (e.g., no files provided)

What --fix does

The fixer makes conservative, idempotent edits that align files with parser expectations. It only writes changes if the fixed version parses successfully.

Applied rules:

  • Normalize line endings: CRLF/CR → LF
  • Convert leading tabs to spaces; normalize indentation to multiples of two spaces
  • Trim trailing spaces
  • Ensure the file ends with a single newline
  • Normalize type aliases: sint8|sint16|sint32|sint64 → int8|int16|int32|int64 (word‑boundary aware)

Notes:

  • Structural issues that require semantic changes aren’t auto‑fixed (e.g., exceeding global limits, missing required delimiters, incomplete statements).
  • If parsing still fails after fixing, the original file is left unchanged and an error is reported.

Build and install

  • Built as a regular CMake executable target funstx and placed in the same build directory as fun (e.g., build_debug/ or build_release/).
  • Installed by default alongside fun into /usr/bin via make install/cmake --build <build_dir> --target install.

Integration tips

  • Use funstx --fix in pre‑commit hooks or CI to enforce consistent formatting.
  • For quiet CI logs, capture stdout and only surface stderr on failure.
  • Combine with find/xargs to process large trees efficiently (see examples above).

Limitations

  • Does not execute bytecode or validate runtime behavior.
  • The auto‑fixer focuses on formatting and a small set of safe token normalizations; it won’t rewrite program structure.

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