BGforge multi-language server

BGforge MLS is a collection of tools for working with classic RPG modding languages and file formats. It supports Star-Trek Scripting Language (.ssl) used in Fallout 1 and 2, several WeiDU and Infinity Engine formats (.d, .baf, .tp2, .tra, .2da), Sword Coast Stratagems Scripting Language (.ssl, .slb), and the TypeScript-based transpilers TSSL, TBAF, and TD.

Originally a VS Code extension, it now also works with various other editors. Setup guides are available for Sublime, Neovim, Emacs, JetBrains, Helix, Zed, Kate, Notepad++, and Geany. Standalone LSP server is published in NPM.

• Languages: Fallout SSL; WeiDU BAF, D, TP2.
• Transpilers: TSSL, TBAF, TD.
• Other formats: TRA, MSG, 2DA, Fallout PRO, worldmap.txt and scripts.lst.
• Installation
• Hotkeys
• Screenshots: completion, hover, error reporting, dialog tree preview.
• Forum

Languages

Feature	Fallout SSL	WeiDU BAF	WeiDU SSL	WeiDU D	WeiDU TP2
Extensions	.ssl, .h	.baf	.slb, .ssl	.d	.tp2, .tpa, .tph, .tpp
Completion	✓	✓	✓	✓	✓
Hover	✓	✓	✓	✓	✓
Signature help	✓
Go to definition	✓			✓	✓
Find references	✓			✓	✓
Formatting	✓	✓	✓	✓	✓
Document symbols	✓			✓	✓
Workspace symbols	✓				✓
Semantic tokens	✓				✓
Rename	✓			✓	Same file
Inlay hints	.msg	.tra	.tra	.tra	.tra
Diagnostics	✓	✓	✓	✓	✓
JSDoc	✓			✓	✓
Folding	✓	✓	✓	✓	✓
Dialog preview	✓			✓

Transpilers

These are TypeScript-like language subsets that compile to the scripting formats above.

They bring the TypeScript type system, many TypeScript features, and better tooling to modding.

Transpiler	Extension	Target	Inlay Hints	Dialog Preview
TSSL	.tssl	.ssl	.msg	✓
TBAF	.tbaf	.baf	.tra
TD	.td	.d	.tra	✓

TSSL (.tssl) compiles to Fallout SSL. Companion project: FOlib.

TBAF (.tbaf) compiles to WeiDU BAF. Important additions include functions, loops, variables, arrays, enums. Companion project: IETS.

TD (.td) compiles to WeiDU D. Same features as TBAF, but has different structure. Also uses IETS.

Other formats

Format	Extensions	Support
Fallout worldmap	worldmap.txt	Completion, hover, syntax highlighting
Fallout MSG	.msg	Syntax highlighting
Fallout scripts.lst	scripts.lst	Syntax highlighting
Fallout PRO	.pro	Binary viewer
WeiDU TRA	.tra	Syntax highlighting
Infinity 2DA	.2da	Syntax highlighting

Installation

1. Install BGforge MLS from the VS Code Marketplace. Alternatively, download the package from GitHub Releases and install it manually.
2. Check general settings.
3. Check file associations.
4. Check hotkeys.
5. Enable custom theme and icon theme.
6. (Infinity Engine) Install IElib.

Hotkeys

• CTRL+R: compile a Fallout .ssl file or parse a WeiDU file, reporting errors if any.
• CTRL+SHIFT+V: open dialog tree preview (SSL, TSSL, D, TD files).
• Standard VS Code hotkeys:
  • CTRL+SHIFT+O: document symbols
  • CTRL+T: workspace symbols

Screenshots

Infinity Engine highlighting and completion

Fallout highlighting and hovers

Dialog tree preview

Visual dialog tree for SSL, TSSL, D, and TD files. Open with CTRL+SHIFT+V or the command palette. Shows states, transitions, and resolved translation strings.

Error reporting