husht

All the Rust, just with less syntax

You can think of husht as a preprocessor for Rust, or as a indentation-significant "quiet syntax" language that compiles to Rust. In any case, the idea is that .hsh files will transform 1-1 into .rs files, and that all Rust language features will be available in a straightforward way in husht. Along the way, we will likely add some additional syntactic sugar in husht to easy some of the more common language patterns in Rust. In particular, we plan to add more familiar syntax for closures.

One less common feature of husht is that we will maintain its ability to perform "disassembly" of Rust into recommended husht abbreviated form. Thus, one can test husht by performing round trips, and in particular, Rust -> husht -> Rust should have essentially the same behavior as prettyprinting the original Rust code with rustfmt.

The base source code of husht is written in husht, but for (relatively clear) bootstrapping purposes, it ships with the transformed Rust, and one key end-to-end test is that the shipped husht code for husht indeed transforms into the Rust code.

Documentation of specific syntax features of husht will be added as they are implemented.

Usage

husht [options] [sources]

Transforms some files from husht to Rust. The source specification sources is a list of files, directories or glob patterns, defaulting to .. A directory dir is interpreted the same way as the glob pattern dir/** -- in other words, all files recursively within that directory. Glob patterns are matched and all matching files are added to the list of files to process. If there is a destination directory (see below), all files in the destination directory are ignored. Files that do not have extension .toml or .hsh are ignored. The former are copied unchanged; the latter are transformed per the husht language specification into Rust .rs files.

Options:

• -h, --help -- Print a usage summary and exit

• -o, --destination [dir/file] -- Specifies the destination of the transformed file(s). If the destination is a single file, the sources must be as well, and the one file is transformed into the other. A destination specification without an extension is assumed to be a directory. The default destination is rust.

  If the destination is a directory, then the transform of each source file is written into that directory, preserving its relative path to its "root". The root of a file added by virtue of a glob is the top level directory of that glob pattern. The root of a file specified explicitly is the current directory.

For example, if the src directory contains main.hsh, sub/crate.hsh, and Cargo.toml (and there are no other .hsh or .toml files in the directory tree), then husht src would write rust/main.rs, rust/sub/crate.rs, and rust/Cargo.toml. On the other hand just husht, defaulting to husht ., would write rust/src/main.rs, rust/src/sub/crate.rs, and rust/src/Cargo.toml.