349 lines
9 KiB
Lua
349 lines
9 KiB
Lua
---@class diffs.Highlights
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---@field background boolean
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---@field gutter boolean
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---@class diffs.TreesitterConfig
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---@field enabled boolean
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---@field max_lines integer
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---@class diffs.VimConfig
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---@field enabled boolean
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---@field max_lines integer
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---@class diffs.Config
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---@field enabled boolean
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---@field debug boolean
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---@field debounce_ms integer
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---@field hide_prefix boolean
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---@field treesitter diffs.TreesitterConfig
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---@field vim diffs.VimConfig
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---@field highlights diffs.Highlights
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---@class diffs
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---@field attach fun(bufnr?: integer)
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---@field refresh fun(bufnr?: integer)
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---@field setup fun(opts?: diffs.Config)
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local M = {}
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local highlight = require('diffs.highlight')
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local log = require('diffs.log')
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local parser = require('diffs.parser')
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local ns = vim.api.nvim_create_namespace('diffs')
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---@param hex integer
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---@param bg_hex integer
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---@param alpha number
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---@return integer
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local function blend_color(hex, bg_hex, alpha)
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---@diagnostic disable: undefined-global
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local r = bit.band(bit.rshift(hex, 16), 0xFF)
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local g = bit.band(bit.rshift(hex, 8), 0xFF)
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local b = bit.band(hex, 0xFF)
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local bg_r = bit.band(bit.rshift(bg_hex, 16), 0xFF)
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local bg_g = bit.band(bit.rshift(bg_hex, 8), 0xFF)
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local bg_b = bit.band(bg_hex, 0xFF)
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local blend_r = math.floor(r * alpha + bg_r * (1 - alpha))
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local blend_g = math.floor(g * alpha + bg_g * (1 - alpha))
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local blend_b = math.floor(b * alpha + bg_b * (1 - alpha))
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return bit.bor(bit.lshift(blend_r, 16), bit.lshift(blend_g, 8), blend_b)
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---@diagnostic enable: undefined-global
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end
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---@param name string
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---@return table
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local function resolve_hl(name)
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local hl = vim.api.nvim_get_hl(0, { name = name })
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while hl.link do
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hl = vim.api.nvim_get_hl(0, { name = hl.link })
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end
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return hl
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end
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---@type diffs.Config
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local default_config = {
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enabled = true,
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debug = false,
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debounce_ms = 0,
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hide_prefix = false,
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treesitter = {
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enabled = true,
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max_lines = 500,
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},
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vim = {
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enabled = false,
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max_lines = 200,
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},
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highlights = {
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background = true,
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gutter = true,
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},
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}
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---@type diffs.Config
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local config = vim.deepcopy(default_config)
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---@type table<integer, boolean>
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local attached_buffers = {}
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---@type table<integer, boolean>
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local diff_windows = {}
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---@param bufnr integer
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---@return boolean
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function M.is_fugitive_buffer(bufnr)
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return vim.api.nvim_buf_get_name(bufnr):match('^fugitive://') ~= nil
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end
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local dbg = log.dbg
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---@param bufnr integer
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local function highlight_buffer(bufnr)
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if not config.enabled then
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return
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end
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if not vim.api.nvim_buf_is_valid(bufnr) then
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return
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end
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vim.api.nvim_buf_clear_namespace(bufnr, ns, 0, -1)
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local hunks = parser.parse_buffer(bufnr)
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dbg('found %d hunks in buffer %d', #hunks, bufnr)
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for _, hunk in ipairs(hunks) do
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highlight.highlight_hunk(bufnr, ns, hunk, {
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hide_prefix = config.hide_prefix,
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treesitter = config.treesitter,
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vim = config.vim,
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highlights = config.highlights,
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})
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end
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end
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---@param bufnr integer
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---@return fun()
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local function create_debounced_highlight(bufnr)
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local timer = nil ---@type table?
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return function()
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if timer then
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timer:stop() ---@diagnostic disable-line: undefined-field
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timer:close() ---@diagnostic disable-line: undefined-field
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timer = nil
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end
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local t = vim.uv.new_timer()
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if not t then
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highlight_buffer(bufnr)
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return
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end
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timer = t
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t:start(
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config.debounce_ms,
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0,
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vim.schedule_wrap(function()
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if timer == t then
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timer = nil
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t:close()
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end
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highlight_buffer(bufnr)
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end)
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)
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end
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end
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---@param bufnr? integer
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function M.attach(bufnr)
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bufnr = bufnr or vim.api.nvim_get_current_buf()
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if attached_buffers[bufnr] then
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return
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end
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attached_buffers[bufnr] = true
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dbg('attaching to buffer %d', bufnr)
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local debounced = create_debounced_highlight(bufnr)
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highlight_buffer(bufnr)
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vim.api.nvim_create_autocmd({ 'TextChanged', 'TextChangedI' }, {
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buffer = bufnr,
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callback = debounced,
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})
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vim.api.nvim_create_autocmd('Syntax', {
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buffer = bufnr,
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callback = function()
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dbg('syntax event, re-highlighting buffer %d', bufnr)
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highlight_buffer(bufnr)
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end,
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})
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vim.api.nvim_create_autocmd('BufReadPost', {
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buffer = bufnr,
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callback = function()
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dbg('BufReadPost event, re-highlighting buffer %d', bufnr)
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highlight_buffer(bufnr)
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end,
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})
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vim.api.nvim_create_autocmd('BufWipeout', {
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buffer = bufnr,
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callback = function()
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attached_buffers[bufnr] = nil
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end,
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})
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end
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---@param bufnr? integer
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function M.refresh(bufnr)
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bufnr = bufnr or vim.api.nvim_get_current_buf()
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highlight_buffer(bufnr)
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end
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local function compute_highlight_groups()
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local normal = vim.api.nvim_get_hl(0, { name = 'Normal' })
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local diff_add = vim.api.nvim_get_hl(0, { name = 'DiffAdd' })
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local diff_delete = vim.api.nvim_get_hl(0, { name = 'DiffDelete' })
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local diff_added = resolve_hl('diffAdded')
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local diff_removed = resolve_hl('diffRemoved')
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local bg = normal.bg or 0x1e1e2e
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local add_bg = diff_add.bg or 0x2e4a3a
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local del_bg = diff_delete.bg or 0x4a2e3a
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local add_fg = diff_added.fg or diff_add.fg or 0x80c080
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local del_fg = diff_removed.fg or diff_delete.fg or 0xc08080
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local blended_add = blend_color(add_bg, bg, 0.4)
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local blended_del = blend_color(del_bg, bg, 0.4)
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vim.api.nvim_set_hl(0, 'DiffsAdd', { default = true, bg = blended_add })
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vim.api.nvim_set_hl(0, 'DiffsDelete', { default = true, bg = blended_del })
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vim.api.nvim_set_hl(0, 'DiffsAddNr', { default = true, fg = add_fg, bg = blended_add })
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vim.api.nvim_set_hl(0, 'DiffsDeleteNr', { default = true, fg = del_fg, bg = blended_del })
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local diff_change = resolve_hl('DiffChange')
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local diff_text = resolve_hl('DiffText')
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vim.api.nvim_set_hl(0, 'DiffsDiffAdd', { bg = diff_add.bg })
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vim.api.nvim_set_hl(0, 'DiffsDiffDelete', { fg = diff_delete.fg, bg = diff_delete.bg })
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vim.api.nvim_set_hl(0, 'DiffsDiffChange', { bg = diff_change.bg })
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vim.api.nvim_set_hl(0, 'DiffsDiffText', { bg = diff_text.bg })
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end
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local DIFF_WINHIGHLIGHT = table.concat({
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'DiffAdd:DiffsDiffAdd',
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'DiffDelete:DiffsDiffDelete',
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'DiffChange:DiffsDiffChange',
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'DiffText:DiffsDiffText',
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}, ',')
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function M.attach_diff()
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if not config.enabled then
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return
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end
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local tabpage = vim.api.nvim_get_current_tabpage()
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local wins = vim.api.nvim_tabpage_list_wins(tabpage)
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local diff_wins = {}
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for _, win in ipairs(wins) do
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if vim.api.nvim_win_is_valid(win) and vim.wo[win].diff then
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table.insert(diff_wins, win)
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end
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end
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if #diff_wins == 0 then
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return
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end
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for _, win in ipairs(diff_wins) do
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vim.api.nvim_set_option_value('winhighlight', DIFF_WINHIGHLIGHT, { win = win })
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diff_windows[win] = true
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dbg('applied diff winhighlight to window %d', win)
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end
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end
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function M.detach_diff()
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for win, _ in pairs(diff_windows) do
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if vim.api.nvim_win_is_valid(win) then
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vim.api.nvim_set_option_value('winhighlight', '', { win = win })
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end
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diff_windows[win] = nil
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end
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end
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---@param opts? diffs.Config
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function M.setup(opts)
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opts = opts or {}
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vim.validate({
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enabled = { opts.enabled, 'boolean', true },
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debug = { opts.debug, 'boolean', true },
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debounce_ms = { opts.debounce_ms, 'number', true },
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hide_prefix = { opts.hide_prefix, 'boolean', true },
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treesitter = { opts.treesitter, 'table', true },
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vim = { opts.vim, 'table', true },
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highlights = { opts.highlights, 'table', true },
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})
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if opts.treesitter then
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vim.validate({
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['treesitter.enabled'] = { opts.treesitter.enabled, 'boolean', true },
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['treesitter.max_lines'] = { opts.treesitter.max_lines, 'number', true },
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})
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end
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if opts.vim then
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vim.validate({
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['vim.enabled'] = { opts.vim.enabled, 'boolean', true },
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['vim.max_lines'] = { opts.vim.max_lines, 'number', true },
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})
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end
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if opts.highlights then
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vim.validate({
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['highlights.background'] = { opts.highlights.background, 'boolean', true },
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['highlights.gutter'] = { opts.highlights.gutter, 'boolean', true },
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})
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end
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if opts.debounce_ms and opts.debounce_ms < 0 then
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error('diffs: debounce_ms must be >= 0')
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end
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if opts.treesitter and opts.treesitter.max_lines and opts.treesitter.max_lines < 1 then
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error('diffs: treesitter.max_lines must be >= 1')
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end
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if opts.vim and opts.vim.max_lines and opts.vim.max_lines < 1 then
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error('diffs: vim.max_lines must be >= 1')
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end
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config = vim.tbl_deep_extend('force', default_config, opts)
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log.set_enabled(config.debug)
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compute_highlight_groups()
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vim.api.nvim_create_autocmd('ColorScheme', {
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callback = function()
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compute_highlight_groups()
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for bufnr, _ in pairs(attached_buffers) do
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highlight_buffer(bufnr)
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end
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end,
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})
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vim.api.nvim_create_autocmd('WinClosed', {
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callback = function(args)
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local win = tonumber(args.match)
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if win and diff_windows[win] then
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diff_windows[win] = nil
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end
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end,
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})
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end
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return M
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