lechange 0.3.0

Ultra-fast Git change detection powered by Rust

Le Change

Fast Git change detection with deploy matrix generation.

Rust core library with a CLI binary, GitHub Action, and Python bindings.

Features

• Diff two commits and list changed files by type (added, modified, deleted, renamed)
• Glob pattern filtering and exclusion
• Dynamic group discovery via files_group_by templates (e.g. stacks/{group}/**)
• Deploy matrix JSON output for GitHub Actions strategy.matrix
• Workflow failure tracking with per-run or per-job granularity
• Concurrent workflow detection with deadlock-safe priority ordering
• Ancestor directory file association for monorepo layouts
• Vanished-file detection: files added then removed within a PR (invisible to endpoint diffs) surface as action: destroy matrix entries with the commit to reconstruct them from
• Static musl binaries for Linux (zero runtime dependencies)

GitHub Action

jobs:
  detect:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.changes.outputs.matrix }}
      has_changes: ${{ steps.changes.outputs.has_changes }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - uses: lituus-io/le-change@v1
        id: changes
        with:
          files: 'stacks/**/*.yaml'
          files_group_by: 'stacks/{group}/**'

  deploy:
    needs: detect
    if: needs.detect.outputs.has_changes == 'true'
    strategy:
      matrix: ${{ fromJson(needs.detect.outputs.matrix) }}
    runs-on: ubuntu-latest
    steps:
      - run: echo "Deploying ${{ matrix.stack }}"

Action Inputs

Input	Default	Description
files		Glob patterns to include (comma-separated)
files_ignore		Glob patterns to exclude
files_group_by		Group discovery template (e.g. stacks/{group}/**)
files_group_by_key	name	Group key mode: name, path, or hash
files_ancestor_lookup_depth	0	Ancestor directory lookup depth (max 3)
track_workflow_failures	false	Enable workflow failure tracking
failure_tracking_level	run	Tracking granularity: run or job
wait_for_active_workflows	false	Wait for concurrent overlapping workflows
workflow_max_wait_seconds	300	Max wait time in seconds
workflow_name_filter		Glob pattern to filter workflow names
deploy_matrix_include_reason	false	Add action/reason to matrix entries
deploy_matrix_include_concurrency	false	Add concurrency info to matrix entries
detect_vanished	false	Detect files added then removed within the PR history (needs fetch-depth: 0)
vanished_max_commits	500	Max commits the vanished walk visits (0 = unlimited)
deleted_to_destroy	false	Emit action: destroy matrix entries for fully-deleted groups
token	github.token	GitHub token for API access
base_sha		Override base commit SHA
sha		Override head commit SHA

Action Outputs

Output	Description
matrix	Deploy matrix JSON for fromJson()
has_changes	true if any deployable changes detected
any_changed	true if any files changed
changed_files	Space-separated changed file paths
changed_files_count	Number of changed files
added_files	Space-separated added file paths
modified_files	Space-separated modified file paths
deleted_files	Space-separated deleted file paths
deploy_decisions	JSON array of per-group deploy decisions
files_to_rebuild	Files needing rebuild
files_to_skip	Files safe to skip
diagnostics	JSON array of diagnostic messages
vanished_files	Space-separated files added then removed within the PR history
vanished	JSON array of {path, last_seen_sha} for vanished files

CLI

lechange detect \
  --files 'stacks/**/*.yaml' \
  --files-group-by 'stacks/{group}/**' \
  --base-sha abc123 \
  --sha def456 \
  --output-format json

All options accept environment variables with LECHANGE_ prefix (e.g. LECHANGE_FILES).

Exit codes: 0 = changes detected, 1 = error, 2 = no changes.

Python

pip install lechange

from lechange import ChangeDetector, Config

detector = ChangeDetector(".")
config = Config(
    files=["src/**/*.py"],
    files_group_by="src/{group}/**",
    base_sha="abc123",
    sha="def456",
)
result = detector.get_changed_files(config)

print(result.all_changed_files)
print(result.deploy_matrix)
print(result.has_deployable_groups)

Development

cargo test -p le-change    # Core library tests
cargo test -p lechange-cli     # CLI tests
cargo build --release -p lechange-cli  # Release binary

License

Copyright (c) 2024-2026 Lituus-io. All rights reserved.

AGPL-3.0-or-later. Commercial license available — contact [e-mail].