Tish - Native Performance, Familiar Syntax

tish-fmt is a standalone tool (like rustfmt vs rustc). The compiler CLI tish does not include formatting. The tish-lsp server uses the same tish_fmt library for Format Document in editors.

Install

From the Tish repo:

cargo build --release -p tish_fmt
# Binary: target/release/tish-fmt

CLI

# Rewrite file in place
tish-fmt path/to/file.tish
 
# CI: fail if file would change (exit non-zero)
tish-fmt --check path/to/file.tish

Flag	Meaning
(positional)	Path to a `.tish` file
`--check`	Do not write; exit with error if formatting would change the file

Exit codes: 0 success; non-zero on parse error, I/O error, or --check mismatch.

Style rules

Indentation: 2 spaces per block level.
Blocks: Braced { ... } in output where the AST represents blocks.
Strings: Double-quoted with standard escapes in formatted output.

Caveats: Formatting can drop or move comments — the AST does not preserve all trivia. Review diffs after first format.

Editor integration

Use Format Document via tish-lsp, or invoke tish-fmt in a task or pre-commit hook.

CI example

- name: Check Tish formatting
  run: |
    for f in $(find . -name '*.tish'); do
      tish-fmt --check "$f" || exit 1
    done