git-spreader 0.1.0

Redistribute git commit timestamps across a realistic working schedule

git-spreader

Redistribute git commit timestamps across a realistic working schedule.

Takes compressed bursts of commits (weekend hackathons, late-night sessions) and respaces them to look like steady, sustainable work during business hours — with realistic human touches like jitter, flow-state clustering, occasional late-night/weekend commits, and random days off.

Installation

pip install git-spreader
# or
uv pip install git-spreader

Usage

Preview a schedule (dry run)

git-spreader preview HEAD~10..HEAD --start 2025-01-01 --seed 42

  #  Original Date          New Date                Score  Gap      Summary
  1  2025-02-15 02:14:33    2025-01-02 09:23:41     0.12   —        fix: typo in README
  2  2025-02-15 02:31:07    2025-01-02 09:48:15     0.08   25m      chore: update deps
  3  2025-02-15 03:45:22    2025-01-06 10:12:33     0.73   1d 25m   feat: add auth module
  4  2025-02-15 04:02:19    2025-01-06 14:45:08     0.45   4h 33m   feat: auth tests
  5  2025-02-15 04:15:41    2025-01-07 09:37:22     0.91   18h 52m  refactor: database layer

Rewrite timestamps

git-spreader spread HEAD~10..HEAD --start 2025-01-01 --seed 42

Set a fixed date range

git-spreader spread HEAD~20..HEAD --start 2025-01-01 --end 2025-01-31

Override working hours

git-spreader spread HEAD~10..HEAD --start 2025-02-01 --working-hours 08:00-16:00

Manage configuration

git-spreader config --show    # print effective config
git-spreader config --reset   # reset to defaults

How It Works

Complexity scoring

Each commit is scored by a weighted combination of lines changed (50%), files touched (30%), and diff size in bytes (20%). The score is mapped through a curve (sqrt by default) to a time gap:

gap = min_gap + (max_gap - min_gap) * sqrt(score)

A typo fix gets a 10-minute gap. A 500-line refactor gets hours.

Scheduling

Gaps are placed within configurable working hours (default 09:00–17:00, Mon–Fri). When a gap crosses a day boundary, the commit wraps to the next available working day.

Realism engine

Six modifiers make the schedule look human:

Modifier	Phase	Effect
Holidays	Pre-schedule	Removes holiday dates (US, UK, CA, etc.)
Days off	Pre-schedule	Randomly skips ~10% of workdays
Flow state	Post-schedule	Clusters 2–4 related commits into tight bursts
Late night	Post-schedule	Moves ~5% of low-complexity commits to 21:00–01:00
Weekend	Post-schedule	Adds 1–3 commits to ~8% of weekend days
Jitter	Post-schedule	Random ±5–10 min offset on all timestamps

All modifiers are individually configurable and can be disabled.

Backup and undo

Before rewriting, a backup ref is created at refs/spreader-backup/<timestamp>. To undo:

git reset --hard refs/spreader-backup/<timestamp>

Configuration

Configuration uses a three-tier precedence model: CLI flags > repo .git-spreader.toml > global ~/.config/git-spreader/config.toml > defaults.

Example .git-spreader.toml:

[schedule]
working_hours = { start = "09:00", end = "17:00" }
working_days = ["Mon", "Tue", "Wed", "Thu", "Fri"]
timezone = "America/Los_Angeles"

[realism]
late_night_probability = 0.05
weekend_probability = 0.08
random_day_off_probability = 0.10
flow_state_clustering = true
avoid_holidays = true

[realism.jitter]
min_offset_minutes = -5
max_offset_minutes = 10

[realism.holidays]
calendar = "US"
additional = ["2025-12-24", "2025-12-26"]

[complexity]
weights = { lines = 0.5, files = 0.3, bytes = 0.2 }
min_gap_minutes = 10
max_gap_minutes = 480
curve = "sqrt"  # or "linear", "log"

Development

uv sync
uv run pytest
uv run ruff check src/ tests/
uv run pyright src/

License

Polyform Shield 1.0.0