VS Code Extension

The Rumoca extension provides diagnostics, completions, simulation commands, scenario settings, and result viewers.

Modelica Source Roots

Modelica package paths are configured with rumoca.sourceRootPaths.

Repository-relative paths are supported and resolved against the current VS Code workspace root before they are sent to the language server. This makes workspace settings safe to commit:

{
  "rumoca.sourceRootPaths": [
    "target/msl/ModelicaStandardLibrary-4.1.0/Modelica 4.1.0",
    "target/cmm/CMM-v0.0.2"
  ]
}

The repository includes committed settings for common open modes:

Run cargo xtask repo modelica-deps ensure first so those target directories exist.

Settings Panel

Open Rumoca settings from the toolbar/command palette. The settings panel has two source-root sections:

• Workspace Modelica Path edits rumoca.sourceRootPaths at workspace scope. Use this for MSL, CMM, and other shared packages.
• Scenario Source Root Paths edits the active rum.toml scenario. Use this for paths that only apply to that one configured run.

The picker stores workspace-relative paths whenever the selected folder is inside the workspace.

Running Models

Run actions operate on rum.toml scenario files. The extension contributes rum.toml as a TOML language extension, so normal TOML editor features can attach while Rumoca still activates for rum.toml and .mo files. Modelica files may offer a wizard to create a rum.toml scenario, but the runnable source of truth is the scenario file.

For interactive examples, open the rum.toml scenario, then use Play. For batch simulation, the results panel opens inside VS Code.

Diagnostics

Compiler and simulation diagnostics are reported to the Problems panel when a source span is available. CLI output uses rich terminal diagnostics; VS Code diagnostics use the raw file/range information without terminal wrappers.