Editors#

Temper has a language server, and a Visual Studio Code extension built on it. Other editors that speak the Language Server Protocol can use the server too.

VS Code#

The extension highlights Temper (.temper) and literate Temper (.temper.md), shows a rendered preview of literate files, and runs the language server for:

errors, warnings, and hints (faded, such as an unnecessary type check) as you type, for the whole library around a file, unsaved edits included;
hover, with a name's type or signature and its doc comment;
go to definition, into the standard library too;
completion of names, members, and object literals' properties;
find references, rename, the outline, and signature help.

Blocks tagged temper inert, Temper shown for reading but not compiled, are highlighted too, tinted and labeled "inert" in the editor, the preview, and on this site; the language server leaves them alone.

Each platform's package bundles the compiler. How to install it, and its settings, are in editors/vscode.

Screenshot of VS Code with Temper code highlighted, with red error squiggles under "Float" in public radius: Float and a hover box noting "No declaration for Float". Elsewhere "Float64" appears without error squiggles.

The language server#

tempest lsp, or tempest serve, speaks the protocol over standard input and output. How it works is in the internals.

Note: Temper's first compiler starts its server with temper serve --port N, and its extension, "Temper Language Support", is built from its repository; tempest's is tempest lsp (or tempest serve, without --port), on standard input and output (inconsistencies).