diffs.nvim/plugin/diffs.lua
Barrett Ruth a2053a132b
feat: unified diff conflict resolution for unmerged files (#99)
## Problem

Pressing `du` on a `UU` (unmerged) file in the fugitive status buffer
had no
effect. There was no way to see a proper ours-vs-theirs diff with syntax
highlighting and intra-line changes, or to resolve conflicts from within
a
unified diff view.

Additionally, pressing `du` on a section header containing only unmerged
files
showed "no changes in section" because `git diff` produces combined
(`diff --cc`)
output for unmerged files, which was stripped entirely.

## Solution

Fetch `:2:` (ours) and `:3:` (theirs) from the git index and generate a
standard
unified diff. The existing highlight pipeline (treesitter + intra-line)
applies
automatically. Resolution keymaps (`doo`/`dot`/`dob`/`don`) on hunks in
the diff
view write changes back to the working file's conflict markers.
Navigation
(`]x`/`[x`) jumps between unresolved conflict hunks.

For section diffs, combined diff entries are now replaced with generated
ours-vs-theirs unified diffs instead of being stripped.

Works for merge, cherry-pick, and rebase conflicts — git populates
`:2:`/`:3:`
the same way for all three.

Closes #61
2026-02-09 12:21:13 -05:00

109 lines
3.8 KiB
Lua

if vim.g.loaded_diffs then
return
end
vim.g.loaded_diffs = 1
require('diffs.commands').setup()
vim.api.nvim_create_autocmd('FileType', {
pattern = { 'fugitive', 'git' },
callback = function(args)
local diffs = require('diffs')
if args.match == 'git' and not diffs.is_fugitive_buffer(args.buf) then
return
end
diffs.attach(args.buf)
if args.match == 'fugitive' then
local fugitive_config = diffs.get_fugitive_config()
if fugitive_config.horizontal or fugitive_config.vertical then
require('diffs.fugitive').setup_keymaps(args.buf, fugitive_config)
end
end
end,
})
vim.api.nvim_create_autocmd('BufReadCmd', {
pattern = 'diffs://*',
callback = function(args)
require('diffs.commands').read_buffer(args.buf)
end,
})
vim.api.nvim_create_autocmd('BufReadPost', {
callback = function(args)
local conflict_config = require('diffs').get_conflict_config()
if conflict_config.enabled then
require('diffs.conflict').attach(args.buf, conflict_config)
end
end,
})
vim.api.nvim_create_autocmd('OptionSet', {
pattern = 'diff',
callback = function()
if vim.wo.diff then
require('diffs').attach_diff()
else
require('diffs').detach_diff()
end
end,
})
local cmds = require('diffs.commands')
vim.keymap.set('n', '<Plug>(diffs-gdiff)', function()
cmds.gdiff(nil, false)
end, { desc = 'Unified diff (horizontal)' })
vim.keymap.set('n', '<Plug>(diffs-gvdiff)', function()
cmds.gdiff(nil, true)
end, { desc = 'Unified diff (vertical)' })
local function conflict_action(fn)
local bufnr = vim.api.nvim_get_current_buf()
local config = require('diffs').get_conflict_config()
fn(bufnr, config)
end
vim.keymap.set('n', '<Plug>(diffs-conflict-ours)', function()
conflict_action(require('diffs.conflict').resolve_ours)
end, { desc = 'Accept current (ours) change' })
vim.keymap.set('n', '<Plug>(diffs-conflict-theirs)', function()
conflict_action(require('diffs.conflict').resolve_theirs)
end, { desc = 'Accept incoming (theirs) change' })
vim.keymap.set('n', '<Plug>(diffs-conflict-both)', function()
conflict_action(require('diffs.conflict').resolve_both)
end, { desc = 'Accept both changes' })
vim.keymap.set('n', '<Plug>(diffs-conflict-none)', function()
conflict_action(require('diffs.conflict').resolve_none)
end, { desc = 'Reject both changes' })
vim.keymap.set('n', '<Plug>(diffs-conflict-next)', function()
require('diffs.conflict').goto_next(vim.api.nvim_get_current_buf())
end, { desc = 'Jump to next conflict' })
vim.keymap.set('n', '<Plug>(diffs-conflict-prev)', function()
require('diffs.conflict').goto_prev(vim.api.nvim_get_current_buf())
end, { desc = 'Jump to previous conflict' })
local function merge_action(fn)
local bufnr = vim.api.nvim_get_current_buf()
local config = require('diffs').get_conflict_config()
fn(bufnr, config)
end
vim.keymap.set('n', '<Plug>(diffs-merge-ours)', function()
merge_action(require('diffs.merge').resolve_ours)
end, { desc = 'Accept ours in merge diff' })
vim.keymap.set('n', '<Plug>(diffs-merge-theirs)', function()
merge_action(require('diffs.merge').resolve_theirs)
end, { desc = 'Accept theirs in merge diff' })
vim.keymap.set('n', '<Plug>(diffs-merge-both)', function()
merge_action(require('diffs.merge').resolve_both)
end, { desc = 'Accept both in merge diff' })
vim.keymap.set('n', '<Plug>(diffs-merge-none)', function()
merge_action(require('diffs.merge').resolve_none)
end, { desc = 'Reject both in merge diff' })
vim.keymap.set('n', '<Plug>(diffs-merge-next)', function()
require('diffs.merge').goto_next(vim.api.nvim_get_current_buf())
end, { desc = 'Jump to next conflict hunk' })
vim.keymap.set('n', '<Plug>(diffs-merge-prev)', function()
require('diffs.merge').goto_prev(vim.api.nvim_get_current_buf())
end, { desc = 'Jump to previous conflict hunk' })