Major performance improvements for graph visualization:
Cache System:
- Add cache.lua module that stores parsed links/tags per file
- Only re-parse files that have been modified (mtime check)
- Cache stored in .ideadrop-graph-cache.json in idea_dir
- Fast file scanning using vim.fs.find when available
Layout Optimizations:
- Reduce max iterations from 300 to 100
- Faster convergence with adjusted parameters
- Barnes-Hut approximation for large graphs (100+ nodes)
- Cache math functions locally for speed
- Skip distant node pairs in repulsion calculation
- Reuse visible_nodes array across iterations
New Commands:
- :IdeaGraph rebuild - Force full cache rebuild
- :IdeaGraphClearCache - Clear cache file
This makes opening the graph nearly instant for previously
scanned vaults, similar to Obsidian's behavior.
- Handle nil idea_dir in config (don't override default with nil)
- Expand environment variables and ~ in paths during setup
- Add get_idea_dir() helper function for consistent path access
- Remove trailing slashes from paths
- Add fallback to non-recursive glob if recursive finds no files
- Show actual path being used in error messages for debugging
- Better error messages when directory doesn't exist or has no .md files
