Support for the Jai programming language. Everything here is derived from the local Jai distribution at ~/.local/jai, never from online material (see AGENTS.md).

What works today

.jai file type with its own icon
Syntax highlighting: keywords, built-in type names, compiler directives (#import, #run, …), notes (@Cleanup), numbers (hex / binary / hexfloat / _ separators), strings, here-strings (#string DONE … DONE), nesting block comments, operators, ---, $/$$, it / it_index
Colour settings page (Settings → Editor → Color Scheme → Jai)
Comment / uncomment (// and nesting /* */)
Brace matching, including the Jai-only .{ struct-literal and .[ array-literal openers

Not yet: parser and PSI, so no structure view, go-to-definition, completion, formatting, or inspections. See docs/BUILD_PLAN.md for the phase plan.

Install it locally

./jaigradle buildPlugin
# -> build/distributions/intellijai-1.0.0-SNAPSHOT.zip

In the IDE: Settings → Plugins → ⚙ → Install Plugin from Disk…, pick that ZIP, restart when prompted. Requires build 253 (2025.3) or newer; verified compatible with IU-253, IU-261 and IU-262 by the JetBrains Plugin Verifier.

To try it, open any file from ~/.local/jai/how_to/.

Uninstall or update the same way — installing a new ZIP over the old one replaces it.

Develop

./jaigradle test     # or ./jaitest, which reports the JUnit XML
./jaigradle check    # full verification

Never call ./gradlew directly: there is no JDK on PATH, and ./jaigradle resolves one via mise first. Read AGENTS.md before changing anything.

Key docs:

File	What it is
`AGENTS.md`	how to work in this repo; current state
`docs/JAI_LANGUAGE_REFERENCE.md`	the language, transcribed from the compiler
`docs/BUILD_PLAN.md`	phased plan and testing strategy

Local IntelliJ references are available in ~/programming/thirdparty:

fortran-plugin — a simple language plugin to use as reference.
intellij-elixir — a more complex plugin to use as reference.
intellij-sdk-docs — local versions of the IntelliJ SDK documentation.