REFACTOR: Even more cleanup

nvim/.config/nvim/lua/DarthMooMancer/statusline.lua

@@ -1,52 +1,30 @@
 local ok, D = pcall(require, 'nvim-web-devicons')
-local a, u, S = vim.api, vim.uv or vim.loop, vim.diagnostic.severity
+local a, S = vim.api, vim.diagnostic.severity
+local now = (vim.uv or vim.loop).now
 local C = a.nvim_get_current_buf
 local R = function()
 	vim.cmd.redrawstatus()
-end
-local M = '%#StatusLineMod#%m%*%#StatusLineRO#%r%* %='
-local FR = { '⠋', '⠙', '⠹', '⠸', '⠼', '⠴', '⠦', '⠧', '⠇', '⠏' }
-local N, SPIN, LOAD = #FR, '%#StatusLspSpinner#', '%* %#StatusLspLoading#'
-local c, T, JOB, TMR, IDX = {}, {}, nil, nil, 1
-local function HI()
-	local bg = a.nvim_get_hl(0, { name = 'StatusLine' }).bg or 'none'
-	for _, t in ipairs({
-		{ 'StatusLineFilename', 'Normal', true },
-		{ 'StatusLineMod', 'WarningMsg', true },
-		{ 'StatusLineRO', 'ErrorMsg', true },
-		{ 'StatusDiagError', 'DiagnosticError', true },
-		{ 'StatusDiagWarn', 'DiagnosticWarn', false },
-		{ 'StatusDiagHint', 'DiagnosticHint', false },
-		{ 'StatusLspSpinner', 'DiagnosticWarn', true },
-		{ 'StatusLspLoading', 'DiagnosticInfo', false },
-		{ 'StatusLspReady', 'Comment', false },
-	}) do
-		local h = a.nvim_get_hl(0, { name = t[2], link = false })
-		a.nvim_set_hl(0, t[1], { fg = h.fg, bg = bg, bold = t[3] })
-	end
-end
+end -- absorb autocmd ev (.file etc.)
+local M = '%m%r %='
+local LOAD = '%#DiagnosticInfo#'
+local T, JOB = {}, nil
+local IV = vim.g.statusline_prog_interval or 750 -- ms cap between progress redraws
+local LAST = 0
 local function snap(bb)
-	local p = a.nvim_buf_get_name(bb)
-	local nm = ' %#StatusLineFilename#'
-	if p == '' then
-		nm = nm .. '[No Name]%*'
-	else
-		local f = p:match('([^/\\]+)$') or p
+	local nm = ' %F' -- native tail: handles [No Name] and escaping in C
 	if ok then
-			local i, hl = D.get_icon(f, p:match('%.([^./\\]+)$'), { default = true })
+		local i, hl = D.get_icon(a.nvim_buf_get_name(bb), nil, { default = true })
 		if i then
-				nm = nm .. '%#' .. hl .. '#' .. i .. ' %*'
+			nm = ' %#' .. hl .. '#' .. i .. ' %*%F'
 		end
 	end
-		nm = nm .. f .. '%*'
-	end
 	local x = vim.diagnostic.count(bb)
 	local e, w, h = x[S.ERROR] or 0, x[S.WARN] or 0, x[S.HINT] or 0
 	local dg = ''
 	if e + w + h > 0 then
-		dg = (e > 0 and ('%#StatusDiagError#E' .. e .. '%* ') or '')
-			.. (w > 0 and ('%#StatusDiagWarn#W' .. w .. '%* ') or '')
-			.. (h > 0 and ('%#StatusDiagHint#H' .. h .. '%* ') or '')
+		dg = (e > 0 and ('%#DiagnosticError#E' .. e .. '%* ') or '')
+			.. (w > 0 and ('%#DiagnosticWarn#W' .. w .. '%* ') or '')
+			.. (h > 0 and ('%#DiagnosticHint#H' .. h .. '%* ') or '')
 	end
 	local rd, cs = '', vim.lsp.get_clients({ bufnr = bb })
 	if #cs > 0 then
@@ -54,12 +32,12 @@ local function snap(bb)
 		for i = 1, #cs do
 			nm2[i] = cs[i].name
 		end
-		rd = '%#StatusLspReady#󰄭 ' .. table.concat(nm2, '/') .. '%* '
+		rd = '󰄭 ' .. table.concat(nm2, '/') .. ' '
 	end
 	return nm .. M .. dg, rd
 end
 local function touch(bb, redraw)
-	local v = c[bb]
+	local v = vim.b[bb] -- per-buffer cache; nvim frees b: vars on unload
 	if v then
 		v.d = true
 	end
@@ -67,7 +45,8 @@ local function touch(bb, redraw)
 		R()
 	end
 end
-local function SYNC()
+local function SYNC(force) -- refresh JOB; redraw only when it changed and (force or gate open)
+	local prev = JOB
 	JOB = nil
 	for _, t in pairs(T) do
 		for _, m in pairs(t) do
@@ -78,57 +57,29 @@ local function SYNC()
 			break
 		end
 	end
-	if JOB and not TMR then
-		IDX = math.floor(u.now() / 100) % N + 1
-		TMR = u.new_timer()
-		TMR:start(
-			0,
-			100,
-			vim.schedule_wrap(function()
-				if JOB then
-					IDX = IDX % N + 1
-					R()
-				elseif TMR then
-					TMR:stop()
-					TMR:close()
-					TMR = nil
-				end
-			end)
-		)
-	elseif not JOB and TMR then
-		TMR:stop()
-		TMR:close()
-		TMR = nil
+	if JOB ~= prev and (force or now() - LAST >= IV) then
+		LAST = now()
 		R()
 	end
 end
 local G = a.nvim_create_augroup('STL5', { clear = true })
-for _, s in ipairs({
-	{
-		{ 'BufEnter', 'BufFilePost' },
-		function(e)
+local function au(ev, cb)
+	a.nvim_create_autocmd(ev, { group = G, callback = cb })
+end
+au({ 'BufEnter', 'BufFilePost' }, function(e)
 	touch(e.buf, true)
-		end,
-	},
-	{
-		'DiagnosticChanged',
-		function(e)
+end)
+au('DiagnosticChanged', function(e)
 	touch(e.buf, e.buf == C())
-		end,
-	},
-	{
-		{ 'LspAttach', 'LspDetach' },
-		function(e)
+end)
+au({ 'LspAttach', 'LspDetach' }, function(e)
 	if e.event == 'LspDetach' then
 		T[e.data.client_id] = nil
-				SYNC()
+		SYNC(true)
 	end
 	touch(e.buf, true)
-		end,
-	},
-	{
-		'LspProgress',
-		function(e)
+end)
+au('LspProgress', function(e)
 	local v = e.data.params.value
 	if type(v) ~= 'table' then
 		return
@@ -137,50 +88,26 @@ for _, s in ipairs({
 	T[id] = T[id] or {}
 	if v.kind == 'end' or (v.kind == 'report' and v.percentage == 100) then
 		T[id][tk] = nil
+		SYNC(true) -- clear immediately, don't gate
 	else
 		local m = (v.title and v.title ~= '' and v.title) or v.message or 'Loading...'
 		if v.title and v.message and v.message ~= '' then
 			m = v.title .. ' ' .. v.message
 		end
 		T[id][tk] = m
+		SYNC() -- gated: at most one redraw per IV ms
 	end
-			SYNC()
-		end,
-	},
-	{
-		'BufUnload',
-		function(e)
-			c[e.buf] = nil
-		end,
-	},
-	{
-		'ColorScheme',
-		function()
-			HI()
-			R()
-		end,
-	},
-	{ 'FocusGained', R },
-}) do
-	a.nvim_create_autocmd(s[1], { group = G, callback = s[2] })
-end
-HI()
+end)
+au('ColorScheme', R)
+au('FocusGained', R)
 local function Status()
-	local bb = C()
-	local v = c[bb]
-	if not v or v.d then
-		if not v then
-			v = {}
-			c[bb] = v
-		end
-		v.h, v.r = snap(bb)
+	local v = vim.b
+	if not v.h or v.d then
+		v.h, v.r = snap(C())
 		v.stl = v.h .. v.r
 		v.d = nil
 	end
-	if JOB then
-		return v.h .. SPIN .. FR[IDX] .. LOAD .. JOB .. '%* '
-	end
-	return v.stl
+	return JOB and (v.h .. LOAD .. JOB .. '%* ') or v.stl
 end
 _G.Status = Status
 vim.opt.statusline = '%!v:lua.Status()'