$ show mbbill/undotree
This is a Vim plugin that visualizes the undo history of a buffer as a tree, allowing users to navigate between different undo branches. It parses Vim's internal `undotree()` data structure and renders an ASCII representation in a dedicated split window. The architecture follows an object-oriented pattern in Vim script, with classes for panels (undotree and diffpanel) encapsulating state and behavior. Key features include: window layout customization, diff panel with sign highlighting, relative timestamps, configurable tree shapes, and support for persistent undo. The plugin is purely Vim script and depends only on an external diff command for the diff panel. It is well-maintained, actively used, and avoids deprecated Vim APIs. The code demonstrates high craftsmanship in Vim scripting, particularly in the ASCII tree rendering algorithm and the diff caching mechanism.
The LLM identified 2 files worth highlighting for reuse:
The core module containing all logic for parsing undo history, rendering ASCII tree, and managing the diff panel. The `Render()` function implements a novel algorithm to convert a hierarchical tree of undo nodes into an ASCII art representation with proper branch and split characters. The `_parseNode()` method recursively converts Vim's undotree() output into an internal node structure with seq, time, parent list. This could be extracted as a standalone ASCII tree renderer for hierarchical data, though it is tightly coupled to Vim's data format. The diff panel with caching and sign placement demonstrates robust engineering for a Vim plugin.
Defines syntax highlighting for the undotree buffer, including nodes, timestamps, branches, sequence numbers, current/next/head markers, saved states, and help text. Uses `syn match` with dynamic regex built from user-configurable tree shape characters. Demonstrates proper Vim syntax plugin pattern and can serve as a reference for creating syntax files for custom buffer types.