Molt: More Or Less Tcl
Molt 0.3.2 is a minimal implementation of the TCL language for embedding in Rust apps and for scripting Rust libraries. Molt is intended to be:
Small in size. Embedding Molt shouldn't greatly increase the size of the application.
Small in language. Standard TCL has many features intended for building entire software systems. Molt is intentionally limited to those needed for embedding.
Small in dependencies. Including the Molt interpreter in your project shouldn't drag in anything else--unless you ask for it.
Easy to build. Building Standard TCL is non-trivial. Embedding Molt should be as simple as using any other crate.
Easy to embed. Extending Molt with TCL commands that wrap Rust APIs should be easy and simple.
Hence, perfect compatibility with Standard TCL is explicitly not a goal. Many
features will not be implemented at all (e.g., octal literals); and others may
be implemented somewhat differently where a clearly better alternative exists
-nocomplain will always be the normal behavior). In addition, Molt will
prefer Rust standards where appropriate.
On the other hand, Molt is meant to be TCL (more or less), not simply a "Tcl-like language", so gratuitous differences are to be avoided. One of the goals of this document is to carefully delineate:
- The features that have not yet been implemented.
- The features that likely will never be implemented.
- Any small differences in behavior.
- And especially, any features that have intentionally been implemented in a different way.
What Molt Is For
Using Molt, you can:
- Create a shell interpreter for scripting and interactive testing of your Rust crates.
- Provide your Rust applications with an interactive REPL for debugging and administration.
- Extend your Rust application with scripts provided at compile-time or at run-time.
- Allow your users to script your applications and libraries.
molt-sample repo for a sample Molt client
New in Molt 0.3.2
Nothing, yet! See the Annotated Change Log for the new features by version.
At this point Molt is capable and robust enough for real work, though the Rust-level API is
not yet completely stable. Standard Rust
0.y.z semantic versioning applies: ".y" changes
can break the Rust-level API, ".z" changes will not.
- More TCL Commands
- Testing improvements
- Documentation improvements
- Feature: Regex and Glob pattern matching by Molt commands