RPGLE Call Graph VS Code Extension

A basic extension to parse RPGLE (RPGLE / RPG) source and render a call graph inside a webview.

Features

• Command: RPGLE: Show Call Graph
• Simple parser for DCL-PROC, END-PROC, CALLP, CALL, and free-format call syntax procName(...)
• Mermaid graph renderer in webview

Setup

1. cd ~/rpgle-call-graph
2. npm install
3. npm run compile
4. Press F5 in VS Code (starts Extension Development Host)

Usage

1. Open a .rpgle / .rpg file.
2. Run command palette: RPGLE: Show Call Graph.
3. Inspect graph panel in sidebar.

Next Improvements

• Add a proper RPGLE grammar parser (Tree-sitter or IBM parser API)
• Resolve cross-file symbol references/vs programs and service programs
• Add tree view / graph interactivity / click-to-navigate
• Support external call graph traversal and filtering