diffs.nvim/plugin/diffs.lua
Barrett Ruth 7781904d65 feat: add unified diff conflict resolution for unmerged files
Problem: pressing du on a UU file in fugitive status fell through to
the unstaged path, where get_index_content(:0:) fails because unmerged
files have no stage 0 entry. The fallback produced a useless diff of
HEAD vs working file with conflict markers shown as changes.

Solution: add a merge.lua module that diffs git show :2: (ours) vs
:3: (theirs), displays the result with full syntax and intra-line
highlighting, and provides resolution keymaps (doo/dot/dob/don/]x/[x)
that write back to the working file's conflict markers. Hunks are
matched to conflict regions by comparing diff del-lines against each
region's ours content. Resolved hunks are tracked per-buffer with
virtual text. commands.lua gains an unmerged branch in gdiff_file and
read_buffer, and plugin/diffs.lua registers Plug(diffs-merge-*)
mappings.
2026-02-08 17:48:15 -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' })