sem

name	sem
description	Use sem for semantic, entity-level code diffs, impact analysis, blame, entity listing, history logs, and compact AI context generation.

sem

sem reports changes, dependencies, affected tests, blame, history, and AI-ready context at semantic entity granularity.

Semantic diffs

sem diff reports additions, modifications, deletions, renames, and moves at the entity level, such as functions, classes, properties, config keys, Markdown sections, and data rows.

# Working tree changes.
sem diff

# Staged changes only.
sem diff --staged

# One commit.
sem diff --commit <sha>

# Commit range.
sem diff --from <ref> --to <ref>

# Restrict by extension.
sem diff --file-exts .ts .tsx

# Include inline before/after content when useful.
sem diff --staged --verbose

sem diff --stdin can analyze supplied file-change input without requiring a git repository.

Impact analysis

Use impact analysis before changing or reviewing an entity to find directly related code.

sem impact <entity>
sem impact <entity> --file path/to/file.ts
sem impact <entity> --deps
sem impact <entity> --dependents
sem impact <entity> --tests
sem impact <entity> --file-exts .ts .tsx

Use --file when multiple entities share the same name.

Blame and history

Use blame for file-level authorship/change information, and log for entity history across recent commits.

sem blame path/to/file.ts
sem log <entity>
sem log <entity> --file path/to/file.ts --limit 100
sem log <entity> --file path/to/file.ts --verbose

Entity listing

Use sem entities to list entities under a file or directory path.

sem entities
sem entities path/to/file.ts
sem entities path/to/directory

AI context

Use context generation to gather a bounded, entity-centered context bundle before asking an AI agent to implement or review a change.

sem context <entity>
sem context <entity> --file path/to/file.ts --budget 12000
sem context <entity> --file-exts .ts .tsx

Supported content

sem parses source code and structured files. Common supported families include TypeScript/JavaScript, Python, Go, Rust, Java, C/C++, C#, Ruby, PHP, Swift, Elixir, Bash, HCL/Terraform, Kotlin, Fortran, Vue, XML, ERB, Svelte, JSON, YAML, TOML, CSV/TSV, and Markdown.