sem

Semantic version control CLI. Entity-level diffs for Git (functions, classes, methods instead of lines).

Structure

Cargo workspace at crates/:

• sem-core — entity extraction engine, tree-sitter parsers, dependency graph
• sem-cli — CLI binary (sem diff, sem graph, sem impact, sem blame)

Build & Test

cargo build --release -p sem-cli     # binary at target/release/sem
cargo test --workspace               # 134 tests

All cargo commands run from repo root. CI builds from crates/ directory.

Key Paths

• Parsers: crates/sem-core/src/parser/plugins/ (23 language plugins + shebang detection)
• Commands: crates/sem-cli/src/commands/
• Entity model: crates/sem-core/src/model/
• Git integration: crates/sem-core/src/git/

Adding a Language

1. Add tree-sitter grammar to sem-core/Cargo.toml
2. Create parser plugin in sem-core/src/parser/plugins/
3. Register in sem-core/src/parser/mod.rs
4. Add tests
5. See CONTRIBUTING.md for the full 7-step guide

Conventions

• Entity granularity: functions, classes, methods, structs, traits, interfaces
• Methods have a parentId linking to their class
• structural_hash for matching entities across versions
• Release on tag push (v*)
• License: MIT OR Apache-2.0