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git-time-machine

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🕰️ Browse Git reflog visually and recover reachable local history with a TUI

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# 🕰️ git-time-machine

> **Browse Git reflog visually and recover reachable local history with a TUI**

`git-time-machine` makes git reflog visual and interactive.

[![Crates.io](https://img.shields.io/crates/v/git-time-machine.svg)](https://crates.io/crates/git-time-machine)
[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)

### [🌐 View Landing Page](https://dinakars777.github.io/git-time-machine/)

</div>

## ✨ The Problem

You just:
- 💥 Moved HEAD and need to find the previous state
- 🗑️ Deleted a local branch and need the last reachable commit
- 🤦 Ran several Git operations and cannot remember the sequence
- 😱 Need to inspect what changed before choosing a recovery point

**Current solution:** Read through `git reflog`, copy hashes, compare candidates, and run the right Git command manually.

**Better:** `git-time-machine` 🎯

## 🚀 Demo

![Demo GIF](https://raw.githubusercontent.com/dinakars777/git-time-machine/main/demo.gif)

*Navigate your local reflog, preview changes, and restore deliberately.*

## 📦 Installation

### Cargo (Recommended)
```bash
cargo install git-time-machine
```

### From Source
```bash
git clone https://github.com/dinakars777/git-time-machine
cd git-time-machine
cargo install --path .
```

## 🎮 Usage

```bash
# Launch in any git repository
git-time-machine

# Show up to 1000 reflog entries (default: last 50)
git-time-machine --all

# Export the current reflog view as JSON
git-time-machine --export-json

# List hard-reset backup refs and recovery commands
git-time-machine --list-backups
```

### Controls

| Key | Action |
|-----|--------|
| `↑` / `k` | Move up |
| `↓` / `j` | Move down |
| `Home` / `End` | Jump to first/last entry |
| `gg` / `G` | Jump to first/last entry (vim-style) |
| `PgUp` / `PgDn` | Jump 10 entries |
| `Space` | Toggle diff panel |
| `d` | Switch between diff summary and full diff |
| `t` | Toggle relative/absolute timestamps |
| `y` | Copy selected commit hash to clipboard |
| `?` | Show contextual help |
| `/` | Search/filter commits by message, hash, author, or time |
| `Esc` | Clear active filter, or quit if no filter is active |
| `Enter` | Hard reset to selected state after creating a backup ref |
| `s` | Soft reset to selected state |
| `c` | Checkout selected state in detached HEAD |
| `q` | Quit |

## 🎯 Features

- ✅ **Visual Timeline** - See recent reflog entries at a glance
- ✅ **Relative Timestamps** - "5m ago", "2h ago", "yesterday"
- ✅ **Diff Preview** - Compare the selected entry before restoring
- ✅ **Safer Restore Modes** - Choose hard reset, soft reset, or detached checkout
- ✅ **Backup Ref Recovery** - List backup refs and exact recovery commands
- ✅ **Copy Commit Hashes** - Copy the selected full hash without changing repository state
- ✅ **Contextual Help** - Press `?` for the current controls and safety reminders
- ✅ **Search/Filter** - Filter by message, hash, author, or relative time
- ✅ **JSON Export** - Export the reflog timeline for automation
- ✅ **Vim Keybindings** - j/k and gg/G navigation
- ✅ **Beautiful TUI** - Built with Ratatui
- ✅ **Lightning Fast** - Written in Rust
- ✅ **Zero Config** - Just works

## 🔥 Use Cases

### Scenario 1: "I Don't Know What I Did, But It's Broken"
```bash
# You ran a bunch of git commands, something broke
# You don't remember the exact sequence
# git reflog shows 50+ cryptic entries

# With git-time-machine:
git-time-machine
# Visually scan the timeline
# See "2h ago - before I started messing around"
# Preview the diff, then choose Enter, s, or c if it is the right state
```

**Why not `git reflog`?** You'd need to:
1. Read through cryptic hashes and messages
2. Guess which one is "before you broke it"
3. Manually `git reset --hard <hash>`
4. Hope you picked the right one
5. Repeat if wrong

### Scenario 2: Recovering Lost Work After Complex Operations
```bash
# You did: rebase, merge, reset, amend, rebase again
# Now you need code from 3 operations ago
# But you don't remember the exact hash

# With git-time-machine:
git-time-machine
# Scroll through visual timeline
# See relative timestamps: "15m ago", "1h ago"
# Find the state you need
# Preview the diff, then pick hard reset, soft reset, or detached checkout
```

**Why not `git reflog | grep`?** You'd need to:
1. Know what to grep for
2. Parse timestamps manually
3. Cross-reference multiple entries
4. Still guess which hash is correct

### Scenario 3: Accidental Branch Deletion
```bash
# Deleted a branch recently but forgot the commit hash
# git branch -D feature-branch

# With git-time-machine:
git-time-machine --all
# Scroll back through your history
# Find "checkout: moving from feature-branch"
# Copy the short hash displayed in the UI
# Hit 'q' to exit, then run: git branch feature-branch <hash>
```

**Why not `git reflog --all`?** You'd need to:
1. Scroll through hundreds of lines of text
2. Find the right branch name in the noise
3. Extract the hash manually
4. Remember the git commands to restore it

### Scenario 4: "Undo" After You've Already Committed
```bash
# You committed to the wrong branch
# Then made 3 more commits
# Then realized the mistake
# git revert won't help - you need to go back in time

# With git-time-machine:
git-time-machine
# Find "before I committed to wrong branch"
# Press c to checkout that state safely
# Cherry-pick the commits to the right branch
```

**Why not `git reset`?** You'd need to:
1. Count how many commits back
2. Remember if it's `--soft`, `--mixed`, or `--hard`
3. Hope you counted right
4. Manually re-apply commits if you messed up

## ⚠️ Recovery Boundaries

`git-time-machine` is a reflog browser. It can only help with history that Git can still see locally.

| Situation | Can it help? | Notes |
|-----------|--------------|-------|
| You moved `HEAD` with reset, rebase, merge, amend, or checkout | Usually | If the target commit is still in the local reflog, you can inspect and restore it. |
| You deleted a local branch | Usually | If the branch tip is still reachable from your local reflog, you can find the commit hash and recreate the branch manually. |
| You force-pushed a remote branch | Sometimes | Only if the commits existed in your local clone before the force-push. It cannot recover commits that were never fetched locally. |
| You lost uncommitted, unstashed files | No | Git reflog tracks refs, not arbitrary working-tree file contents. |
| Git garbage-collected the commit | No | If Git has permanently removed the object, this tool cannot bring it back. |

## 🛠️ How It Works

`git-time-machine` is a wrapper around `git reflog` that:

1. Parses your reflog history
2. Displays it in an interactive TUI
3. Lets you preview and restore reachable local states
4. Shows the exact Git command before restore
5. Runs one of: `git reset --hard <hash>`, `git reset --soft <hash>`, or `git checkout <hash>` (detached HEAD)

**It's just Git under the hood** - useful, but not magic. Hard reset is destructive, so git-time-machine creates a backup ref under `refs/git-time-machine/backups/` before running it.

To find those backup refs later:

```bash
git-time-machine --list-backups
```

The command prints each backup ref, the commit it points to, and exact `git show`
and `git reset --hard` commands for manual inspection and recovery.

## 🤔 Why Not Just Use Git Commands?

**You absolutely can!** But here's the reality:

| Task | With git commands | With git-time-machine |
|------|------------------|---------------------|
| Find state from "before I broke it" | `git reflog`, scan 50+ lines, guess hash, `git reset --hard <hash>`, hope it's right | Scroll, preview, confirm |
| Recover a deleted branch's commit hash | `git reflog`, search manually, find hash, `git checkout -b`, verify | Expanded reflog view, scroll, copy hash |
| Undo complex operation sequence | Remember exact commands, count commits, pick right reset flag | Visual timeline, select the "before" state |
| Explore "what if" scenarios | Multiple `git reset` attempts, risk losing more work | Navigate, preview, and confirm from one interface |

**git-time-machine doesn't replace git** - it makes reflog actually usable for humans who:
- Don't memorize commit hashes
- Don't want to grep through 200 lines of text
- Want to see their history visually
- Need to undo mistakes quickly without googling

Think of it as `git reflog` with a visual interface for recovery decisions.

## 🤝 Contributing

Contributions welcome!

See [ROADMAP.md](ROADMAP.md) for the focused feature plan, recovery boundaries,
and explicit non-goals.

**Next ideas under active consideration:**
- [ ] Mixed reset mode
- [ ] "Panic mode" - undo last N minutes
- [ ] Branch visualization
- [ ] Stash recovery
- [ ] True all-ref reflog mode for deleted branch recovery

## 📝 License

## 🌟 Star History

If this saved you once, give it a star! ⭐

---

**Made with ❤️ and Rust** | [Report Bug](https://github.com/dinakars777/git-time-machine/issues) | [Request Feature](https://github.com/dinakars777/git-time-machine/issues)

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