splice

Version: 2.6.1

Span-safe refactoring kernel for 7 languages. Byte-accurate code editing with graph algorithm analysis.

Positioning: Precision editing tool for codebases indexed by Magellan. Use for cross-file rename, impact analysis, and verified refactoring.

Purpose

splice edits code with graph-aware safety. Built for:

• Developers — Cross-file rename, safe refactoring with rollback
• AI Assistants — Byte-accurate edits with proof-based verification
• Tooling — Scriptable transformations with AST validation

Features

• Span-safe editing — Byte-accurate replacements with tree-sitter validation
• Cross-file rename — Symbol rename across entire codebase
• Graph algorithms — Reachability, dead-code, cycles, condense, slice
• Impact analysis — Blast zone detection before editing
• Proof-based refactoring — Machine-checkable behavioral equivalence
• Code completion — Grounded, import-aware suggestions using Magellan database
  • Cross-file symbol resolution via import tracking
  • Distinguishes local vs imported symbols with source tracking
  • Token filtering and enhanced ranking for imported symbols
  • Performance: low-millisecond internal query time on indexed project databases
• 7 languages — Rust, Python, C, C++, Java, JavaScript, TypeScript

Quick Start

# Install
cargo install splice

# Requires Magellan database (create first)
magellan watch --root ./src --db .magellan/splice.db

# Check status
splice status --db .magellan/splice.db

# Find reachable code from main
splice reachable --symbol main --path src/main.rs --db .magellan/splice.db

# Cross-file rename
splice rename --symbol old_name --to new_name --path src/lib.rs --db .magellan/splice.db

# Code completion (import-aware)
splice complete --file src/lib.rs --line 27 --column 8 --db .magellan/splice.db --max-results 10

Installation

cargo install splice

Backends

Requirements

• Magellan 3.1.7+ — Required for code graph
• sqlitegraph 2.0.3+ — Included automatically

Documentation

• MANUAL.md — Complete command reference and examples
• CHANGELOG.md — Version history
• docs/completion.md — Code completion feature documentation

What splice Does NOT Do

• ❌ Index code (use Magellan)
• ❌ Search code (use llmgrep)
• ❌ CFG analysis (use Mirage)
• ❌ Type checking (use Compiler/LSP)

License

GPL-3.0-or-later. See LICENSE.