prtr

A very minimal interpreter for a subset of Tcl, written in Rust.

Why Tcl-like?

• If the scope is just to call native commands, the implementation can be minimal.
• The minimal prefix-style syntax is friendly to creating domain specific languages. For example add Foo Bar is nicer to type than something like add("Foo Bar") or add("Foo", "Bar").

Status

What works:

• You can register Rust functions and call them from the scripts. (puts, set are provided)
• You can define and retrieve Tcl variables.

Example script:

puts Hello World
[puts Goodbye World]
set a 42
set b 256
puts $a $b

What is missing:

• Quoting (string, block)
• Helpful functions (e.g. if, for, gets)
• A non-allocating lexer/parser (using Cow?) is desirable.
• A rewrite that uses nom instead.