flamestro/deff: interactive, side-by-side file review for git diffs with per-file navigation, vertical and horizontal scrolling, syntax highlighting, and added/deleted line tinting

My name is deff

deff is a Rust TUI: interactive, side-by-side file review for git diffs with per-file navigation, vertical and horizontal scrolling, syntax highlighting, and added/deleted line tinting.

Run the installer script from this repository:

curl -fsSL https://raw.githubusercontent.com/flamestro/deff/main/install.sh | bash

Installer source: https://github.com/flamestro/deff/blob/main/install.sh

The script checks for cargo, clones this project into a temporary directory, installs it, and removes the temporary checkout.

If you have local edits (including untracked files) and want to review them before committing, run:

deff --include-uncommitted

This opens the side-by-side review so you can check exactly what changed in your working tree.

• upstream-ahead strategy (default) to compare local branch changes against its upstream
• range strategy for explicit --base / --head comparison
• Optional --include-uncommitted mode to include working tree and untracked files
• Side-by-side panes with independent horizontal scroll offsets
• Keyboard and mouse navigation (including wheel + shift-wheel)
• Vim-like motion navigation (h/j/k/l, g/G, Ctrl+u/Ctrl+d)
• In-diff search (/ + Enter, then n / N to navigate matches)
• Per-file reviewed toggles (r) with local persistence under .git
• Language-aware syntax highlighting and line-level add/delete tinting

Single-line change view:

Multi-line change view:

deff
deff --strategy upstream-ahead
deff --strategy range --base origin/main --head HEAD
deff --strategy range --base origin/main --include-uncommitted
deff --theme dark

Show help:

Prerequisites:

• Rust toolchain (cargo)
• git
• Interactive terminal (TTY)

1. Build locally:

   cargo build --release --locked
   ./target/release/deff --help

2. Optionally install it to your local Cargo bin path:

   cargo install --path .
   deff --help

3. Run it inside any git repository you want to review:

   cd /path/to/your/repo
   
   # default: compare local branch commits vs upstream
   deff
   
   # explicit range
   deff --base origin/main --head HEAD
   
   # include uncommitted + untracked files
   deff --base origin/main --include-uncommitted

If your branch has no upstream configured, use the explicit --base flow.

Theme selection:

• By default, deff prefers a dark syntax theme (better for black/dark terminals).
• Use --theme auto|dark|light to control rendering for your terminal.
• --theme takes precedence over DEFF_THEME=dark|light.

Search and reviewed workflow:

• Press / to enter a search query for the current file (searches both panes).
• Press Enter to apply the query, then use n / N to jump matches.
• Press r to mark the current file reviewed/unreviewed.
• Reviewed state is persisted locally in .git/deff/reviewed/ and keyed by comparison scope + file content hash.

This repo ships with .github/workflows/bump-version.yml.

• Trigger: publish a GitHub release with a tag like v0.1.0
• Updates Cargo.toml/Cargo.lock on the default branch using commit prefixes (feat: -> next minor, chore:/docs: -> next patch)

See CONTRIBUTING.md for local setup, commit message conventions, and release/versioning rules.

For a module-level map and extension plan, see docs/architecture.md.