revdiff

README

revdiff

Lightweight TUI for reviewing git diffs with inline annotations. Outputs structured annotations to stdout on quit, making it easy to pipe results into AI agents, scripts, or other tools.

Built for a specific use case: reviewing code changes without leaving a terminal-based AI coding session (e.g., Claude Code). Just enough UI to navigate a full-file diff, annotate specific lines, and return the results to the calling process - no more, no less.

Features

• Structured annotation output to stdout - pipe into AI agents, scripts, or other tools
• Full-file diff view with syntax highlighting
• Collapsed diff mode: shows final text with change markers, toggle with v
• Word wrap mode: wraps long lines at viewport boundary with ↪ continuation markers, toggle with w
• Annotate any line in the diff (added, removed, or context) plus file-level notes
• Two-pane TUI: file tree (left) + colorized diff viewport (right)
• Vim-style / search within diff with n/N match navigation
• Hunk navigation to jump between change groups
• Filter file tree to show only annotated files
• Status line with filename, diff stats, hunk position, and mode indicators
• Help overlay (?) showing all keybindings organized by section
• Fully customizable colors via environment variables, CLI flags, or config file

Requirements

• git (used to generate diffs)

Installation

Homebrew (macOS/Linux):

brew install umputun/apps/revdiff

Go install:

go install github.com/umputun/revdiff/cmd/revdiff@latest

Binary releases: download from GitHub Releases (deb, rpm, archives for linux/darwin amd64/arm64).

Claude Code Plugin

revdiff ships with a Claude Code plugin for interactive code review directly from a Claude session. The plugin launches revdiff as a terminal overlay, captures annotations, and feeds them back to Claude for processing.

The plugin requires one of the following terminals since Claude Code itself cannot display interactive TUI applications - the overlay runs revdiff in a separate terminal layer on top of the current session:

Terminal	Overlay method	Detection
tmux	display-popup (blocks until quit)	$TMUX env var
kitty	kitty @ launch --type=overlay	$KITTY_LISTEN_ON env var
wezterm	wezterm cli split-pane	$WEZTERM_PANE env var

Priority: tmux → kitty → wezterm (first detected wins). If none are available, the plugin exits with an error.

Install:

# add marketplace and install
/plugin marketplace add umputun/revdiff
/plugin install revdiff@umputun-revdiff

Use with /revdiff command:

/revdiff                  -- smart detection: uncommitted, last commit, or branch diff
/revdiff HEAD~1           -- review last commit
/revdiff main             -- review current branch against main
/revdiff --staged         -- review staged changes only
/revdiff HEAD~3           -- review last 3 commits

Use with free text (no slash command needed):

"review diff"                     -- smart detection, same as /revdiff
"review diff HEAD~1"              -- last commit
"review diff against main"        -- branch diff
"review changes from last 2 days" -- Claude resolves the ref automatically
"revdiff for staged changes"      -- staged only

When no ref is provided, the plugin detects what to review automatically:

• On main/master with uncommitted changes — reviews uncommitted changes
• On main/master with clean tree — reviews the last commit
• On a feature branch with clean tree — reviews branch diff against main
• On a feature branch with uncommitted changes — asks whether to review uncommitted only or the full branch diff

The plugin includes built-in reference documentation and can answer questions about revdiff usage, available themes, keybindings, and configuration options. It can also create or modify the local config file (~/.config/revdiff/config) on request:

"what chroma themes does revdiff support?"
"switch revdiff to dracula theme"
"what are the revdiff keybindings?"
"set tree width to 3 in revdiff config"

The plugin supports the full review loop: annotate → plan → fix → re-review until no more annotations remain.

Integration with Other Tools

The structured stdout output works with any tool that can read text:

# capture annotations for processing
annotations=$(revdiff main)
if [ -n "$annotations" ]; then
  echo "$annotations" | your-tool
fi

Usage

revdiff [OPTIONS] [ref]

Options

Option	Description	Default
ref	Git ref to diff against	uncommitted changes
--staged	Show staged changes, env: REVDIFF_STAGED	false
--tree-width	File tree panel width in units (1-10), env: REVDIFF_TREE_WIDTH	2
--tab-width	Number of spaces per tab character, env: REVDIFF_TAB_WIDTH	4
--no-colors	Disable all colors including syntax highlighting, env: REVDIFF_NO_COLORS	false
--no-status-bar	Hide the status bar, env: REVDIFF_NO_STATUS_BAR	false
--wrap	Enable line wrapping in diff view, env: REVDIFF_WRAP	false
--no-confirm-discard	Skip confirmation when discarding annotations with Q, env: REVDIFF_NO_CONFIRM_DISCARD	false
--chroma-style	Chroma color theme for syntax highlighting, env: REVDIFF_CHROMA_STYLE	catppuccin-macchiato
-o, --output	Write annotations to file instead of stdout, env: REVDIFF_OUTPUT
--config	Path to config file, env: REVDIFF_CONFIG	~/.config/revdiff/config
--dump-config	Print default config to stdout and exit
-V, --version	Show version info

Config File

All options can be set in a config file at ~/.config/revdiff/config (INI format). CLI flags and environment variables override config file values.

Generate a default config file:

mkdir -p ~/.config/revdiff
revdiff --dump-config > ~/.config/revdiff/config

Then uncomment and edit the values you want to change.

Color customization flags (click to expand)

All color options accept hex values (#rrggbb) and have corresponding REVDIFF_COLOR_* env vars.

Option	Description	Default
--color-accent	Active pane borders and directory names	#D5895F
--color-border	Inactive pane borders	#585858
--color-normal	File entries and context lines	#d0d0d0
--color-muted	Divider lines and status bar	#585858
--color-selected-fg	Selected file text	#ffffaf
--color-selected-bg	Selected file background	#D5895F
--color-annotation	Annotation text and markers	#ffd700
--color-cursor-fg	Cursor indicator color	#bbbb44
--color-cursor-bg	Cursor indicator background	terminal default
--color-add-fg	Added line text	#87d787
--color-add-bg	Added line background	#123800
--color-remove-fg	Removed line text	#ff8787
--color-remove-bg	Removed line background	#4D1100
--color-modify-fg	Modified line text (collapsed mode)	#f5c542
--color-modify-bg	Modified line background (collapsed mode)	#3D2E00
--color-tree-bg	File tree pane background	terminal default
--color-diff-bg	Diff pane background	terminal default
--color-status-fg	Status bar foreground	#202020
--color-status-bg	Status bar background	#C5794F
--color-search-fg	Search match text	#1a1a1a
--color-search-bg	Search match background	#4a4a00

Available chroma styles (click to expand)

Dark themes: aura-theme-dark, aura-theme-dark-soft, base16-snazzy, catppuccin-frappe, catppuccin-macchiato (default), catppuccin-mocha, doom-one, doom-one2, dracula, evergarden, fruity, github-dark, gruvbox, hrdark, monokai, modus-vivendi, native, nord, nordic, onedark, paraiso-dark, rose-pine, rose-pine-moon, rrt, solarized-dark, solarized-dark256, tokyonight-moon, tokyonight-night, tokyonight-storm, vim, vulcan, witchhazel, xcode-dark

Light themes: autumn, borland, catppuccin-latte, colorful, emacs, friendly, github, gruvbox-light, igor, lovelace, manni, modus-operandi, monokailight, murphy, paraiso-light, pastie, perldoc, pygments, rainbow_dash, rose-pine-dawn, solarized-light, tango, tokyonight-day, trac, vs, xcode

Other: RPGLE, abap, algol, algol_nu, arduino, ashen, average, bw, hr_high_contrast, onesenterprise, swapoff

Examples

# review uncommitted changes
revdiff

# review changes against a branch
revdiff main

# review staged changes
revdiff --staged

# review last commit
revdiff HEAD~1

Key Bindings

Navigation:

Key	Action
j/k or up/down	Navigate files (tree) / scroll diff (diff pane)
h/l	Switch between file tree and diff pane
left/right	Horizontal scroll in diff pane
Tab	Switch between file tree and diff pane
PgDown/PgUp	Page scroll in file tree and diff pane
Ctrl+d/Ctrl+u	Page scroll in file tree and diff pane
Home/End	Jump to first/last item
Enter	Switch to diff pane (tree) / start annotation (diff pane)
n/p	Next/previous changed file (n = next match when search active)
[ / ]	Jump to previous/next change hunk in diff

Search:

Key	Action
/	Start search in diff pane
n	Next search match (overrides next file when search active)
N	Previous search match
Esc	Cancel search input / clear search results

Annotations:

Key	Action
a or Enter (diff pane)	Annotate current diff line
A	Add file-level annotation (stored at top of diff)
d	Delete annotation under cursor
Esc	Cancel annotation input

View:

Key	Action
v	Toggle collapsed diff mode (shows final text with change markers)
w	Toggle word wrap (long lines wrap with ↪ continuation markers)
.	Expand/collapse individual hunk under cursor (collapsed mode only)
f	Toggle filter: all files / annotated only (shown when annotations exist)
?	Toggle help overlay showing all keybindings
q	Quit, output annotations to stdout
Q	Discard all annotations and quit (confirms if annotations exist)

Output Format

## handler.go (file-level)
consider splitting this file into smaller modules

## handler.go:43 (+)
use errors.Is() instead of direct comparison

## store.go:18 (-)
don't remove this validation

Contributing

See CONTRIBUTING.md for details.

License

MIT License - see LICENSE file for details.