Tremor language support for VS Code

Adds support for Tremor's languages (tremor-script and tremor-query) to Visual Studio Code. Features:

• Syntax highlighting for .tremor (tremor-script) and .trickle (tremor-query) files
• Error squiggles (with hints for fixing, as applicable)
• Completion for tremor-script and tremor-query (aggregate) functions
• Hover documentation for functions
• Language configuration (autoclosing and surrounding pairs, comment toggling, bracket definition, etc.)

The rich integration features (error diagnostics and completion/hover support) are powered by the Tremor Language Server (Trill). To activate all the features, you will need to install it alongside the extension (instructions below).

For support, please file an issue on the repo or talk to us on Discord. For more details on how you can contribute to this repo (and the Tremor project in general), see CONTRIBUTING.md.

Installation

Language Server

First install the Rust compiler and cargo (Rust's package manager) via https://www.rustup.rs/. This is required currently to build and install the language server.

Now run cargo install tremor-language-server. This places the language server binary in ~/.cargo/bin/, and by default, the extension is configured to pick it up from there.

Extension

Install from VSCode Marketplace, or by entering ext install tremorproject.tremor-language-features at the VS Code command palette Ctrl+P.

Configuration

This extension provides options in VS Code's configuration settings (under File > Preferences > Settings). Available options, with their default values:

{
    "tremor.languageServerExecutable": "~/.cargo/bin/tremor-language-server",
    "tremor.languageServerModulePath": "",
    "tremor-script.trace.server": "off",
    "tremor-query.trace.server": "off"
}

If you installed the language server binary somewhere outside the default cargo path, you will need to update tremor.languageServerExecutable.

The trace configuration controls logging of communication between VS Code and the language server, for each of the tremor languages. Acceptable values are: "off", "messages", "verbose". Turning these on can be helpful during extension development/debugging (to see the log output, navigate to View -> Output, then select Trill entries from the output dropdown).

Development

See development.md.

Publishing

See publishing.md.