Work with diff hunks

See more details in Features and Documentation.

[!NOTE] This was previously hosted at a personal echasnovski GitHub account. It was transferred to a dedicated organization to improve long term project stability. See more details here.

⦿ This is a part of mini.nvim library. Please use this link if you want to mention this module.

⦿ All contributions (issues, pull requests, discussions, etc.) are done inside of 'mini.nvim'.

⦿ See whole library documentation to learn about general design principles, disable/configuration recipes, and more.

⦿ See MiniMax for a full config example that uses this module.

If you want to help this project grow but don't know where to start, check out contributing guides of 'mini.nvim' or leave a Github star for 'mini.nvim' project and/or any its standalone Git repositories.

Demo

https://github.com/nvim-mini/mini.nvim/assets/24854248/77849127-ee9f-430b-9eff-5a8a724c21ea

Features

Visualize difference between buffer text and its configurable reference interactively (updates as you type). This is done per line showing whether it is inside added, changed, or deleted part of difference (called hunk). Visualization can be with customizable colored signs or line numbers.
Special toggleable overlay view with more hunk details inside text area.
Completely configurable per buffer source(s) of reference text used to keep it up to date and define interactions with it. Can be array of sources which are attempted to attach in order. By default uses Git source (buffer's file text from Git index as reference).
Configurable mappings to manage diff hunks:
- Apply and reset hunks inside region (selected visually or with a dot-repeatable operator).
- "Hunk range under cursor" textobject to be used as operator target.
- Navigate to first/previous/next/last hunk.

What it doesn't do:

Provide functionality to work directly with Git outside of visualizing and staging (applying) hunks with (default) Git source. In particular, unstaging hunks is not supported.

For more information see these parts of help:

:h MiniDiff-overview
:h MiniDiff-source-specification
:h MiniDiff-hunk-specification
:h MiniDiff-diff-summary

Overview

Diffs and hunks

The "diff" (short for "difference") is a result of computing how two text strings differ from one another. This is done on per line basis, i.e. the goal is to compute sequences of lines common to both files, interspersed with groups of differing lines (called "hunks").

Although computing diff is a general concept (used on its own, in Git, etc.), this module computes difference between current text in a buffer and some reference text which is kept up to date specifically for that buffer. For example, default reference text is computed as file content in Git index. This can be customized in config.source.

Life cycle

When entering proper (not already enabled, valid, showing text) buffer, it is attempted to be enabled for diff processing.
During enabling, attempt attaching the source. This should set up how reference text is kept up to date.
On every text change, diff computation is scheduled in debounced fashion after customizable delay (200 ms by default).
After the diff is computed, do the following:
- Update visualization based on configurable style: either by placing colored text in sign column or coloring line numbers. Colors for both styles are defined per hunk type in corresponding MiniDiffSign* highlight group and sign text for "sign" style can be configured in config.view.signs.
- Update overlay view (if it is enabled).
- Update vim.b.minidiff_summary and vim.b.minidiff_summary_string buffer-local variables. These can be used, for example, in statusline.
- Trigger MiniDiffUpdated User event. See :h MiniDiff-diff-summary for example of how to use it.

Notes:

Use :edit to reset (disable and re-enable) current buffer.

Overlay

Along with basic visualization, there is a special view called "overlay". Although it is meant for temporary overview of diff details and can be manually toggled via MiniDiff.toggle_overlay(), text can be changed with overlay reacting accordingly.

It shows more diff details inside text area:

Added buffer lines are highlighted with MiniDiffOverAdd highlight group.
Deleted reference lines are shown as virtual text and highlighted with MiniDiffOverDelete highlight group.
Changed reference lines are shown as virtual text and highlighted with MiniDiffOverChange highlight group.

"Change" hunks with equal number of buffer and reference lines have special treatment and show "word diff". Reference line is shown next to its buffer counterpart and only changed parts of both lines are highlighted with MiniDiffOverChange. The rest of reference line has MiniDiffOverContext highlighting.

This usually is the case when config.options.linematch is enabled.

Mappings

This module provides mappings for common actions with diffs, like:

Apply and reset hunks.
"Hunk range under cursor" textobject.
Go to first/previous/next/last hunk range.

Examples:

vip followed by gh / gH applies/resets hunks inside current paragraph. Same can be achieved in operator form ghip / gHip, which has the advantage of being dot-repeatable.
gh_ / gH_ applies/resets current line (even if it is not a full hunk).
ghgh / gHgh applies/resets hunk range under cursor.
dgh deletes hunk range under cursor.
[H / [h / ]h / ]H navigate cursor to the first / previous / next / last hunk range of the current buffer.

Mappings for some functionality are assumed to be done manually. See :h MiniDiff.operator().

Buffer-local variables

Each enabled buffer has the following buffer-local variables which can be used in custom statusline to show an overview of hunks in current buffer:

vim.b.minidiff_summary is a table with the following fields:
- source_name - name of the source.
- n_ranges - number of hunk ranges (sequences of contiguous hunks).
- add - number of added lines.
- change - number of changed lines.
- delete - number of deleted lines.

vim.b.minidiff_summary_string is a string representation of summary with a fixed format. It is expected to be used as is. To achieve different formatting, use vim.b.minidiff_summary to construct one. The best way to do this is by overriding vim.b.minidiff_summary_string in the callback for MiniDiffUpdated event:

local format_summary = function(data)
  local summary = vim.b[data.buf].minidiff_summary
  local t = {}
  if summary.add > 0 then table.insert(t, '+' .. summary.add) end
  if summary.change > 0 then table.insert(t, '~' .. summary.change) end
  if summary.delete > 0 then table.insert(t, '-' .. summary.delete) end
  vim.b[data.buf].minidiff_summary_string = table.concat(t, ' ')
end
local au_opts = { pattern = 'MiniDiffUpdated', callback = format_summary }
vim.api.nvim_create_autocmd('User', au_opts)

Installation

This plugin can be installed as part of 'mini.nvim' library (recommended) or as a standalone Git repository.

There are two branches to install from:

main (default, recommended) will have latest development version of plugin. All changes since last stable release should be perceived as being in beta testing phase (meaning they already passed alpha-testing and are moderately settled).
stable will be updated only upon releases with code tested during public beta-testing phase in main branch.

Here are code snippets for some common installation methods (use only one):

'mini.nvim' library:

| Branch | Code snippet | |--------|-----------------------------------------------| | Main | Follow recommended 'mini.deps' installation | | Stable | Follow recommended 'mini.deps' installation |
Standalone plugin:

| Branch | Code snippet | |--------|----------------------------------------------------------------| | Main | add('nvim-mini/mini.diff') | | Stable | add({ source = 'nvim-mini/mini.diff', checkout = 'stable' }) |

</details> <details> <summary>With <a href="https://github.com/folke/lazy.nvim">folke/lazy.nvim</a></summary>

'mini.nvim' library:

| Branch | Code snippet | |--------|-----------------------------------------------| | Main | { 'nvim-mini/mini.nvim', version = false }, | | Stable | { 'nvim-mini/mini.nvim', version = '*' }, |
Standalone plugin:

| Branch | Code snippet | |--------|-----------------------------------------------| | Main | { 'nvim-mini/mini.diff', version = false }, | | Stable | { 'nvim-mini/mini.diff', version = '*' }, |

</details> <details> <summary>With <a href="https://github.com/junegunn/vim-plug">junegunn/vim-plug</a></summary>

'mini.nvim' library:

| Branch | Code snippet | |--------|------------------------------------------------------| | Main |

Mini.diff

Install / Use

README