REFACTOR: reducing more

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

@@ -1,71 +1,60 @@
-local ok, D = pcall(require, 'nvim-web-devicons')
+local D = require('nvim-web-devicons')
 local a, S = vim.api, vim.diagnostic.severity
 local now = (vim.uv or vim.loop).now
 local C = a.nvim_get_current_buf
+local function cn(c)
+	return c.name
+end
 local R = function()
 	vim.cmd.redrawstatus()
-end -- absorb autocmd ev (.file etc.)
-local M = '%m%r %='
-local LOAD = '%#DiagnosticInfo#'
+end
 local T, JOB = {}, nil
-local IV = vim.g.statusline_prog_interval or 750 -- ms cap between progress redraws
-local LAST = 0
+local IV, LAST = 750, 0
+
 local function snap(bb)
-	local nm = ' %F' -- native tail: handles [No Name] and escaping in C
-	if ok then
-		local i, hl = D.get_icon(a.nvim_buf_get_name(bb), nil, { default = true })
-		if i then
-			nm = ' %#' .. hl .. '#' .. i .. ' %*%F'
-		end
+	local nm = ' %F'
+	local i, hl = D.get_icon(a.nvim_buf_get_name(bb), nil, { default = true })
+	if i then
+		nm = ' %#' .. hl .. '#' .. i .. ' %*%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 ('%#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
-		local nm2 = {}
-		for i = 1, #cs do
-			nm2[i] = cs[i].name
-		end
-		rd = '󰄭 ' .. table.concat(nm2, '/') .. ' '
-	end
-	return nm .. M .. dg, rd
+	local dg = (e > 0 and ('%#DiagnosticError#E' .. e .. '%* ') or '')
+		.. (w > 0 and ('%#DiagnosticWarn#W' .. w .. '%* ') or '')
+		.. (h > 0 and ('%#DiagnosticHint#H' .. h .. '%* ') or '')
+	local cs = vim.lsp.get_clients({ bufnr = bb })
+	local rd = #cs > 0 and ('󰄭 ' .. table.concat(vim.tbl_map(cn, cs), '/') .. ' ') or ''
+	return nm .. '%m%r %=' .. dg, rd
 end
+
 local function touch(bb, redraw)
-	local v = vim.b[bb] -- per-buffer cache; nvim frees b: vars on unload
-	if v then
-		v.d = true
-	end
+	vim.b[bb].d = true
 	if redraw then
 		R()
 	end
 end
-local function SYNC(force) -- refresh JOB; redraw only when it changed and (force or gate open)
+
+local function sync(force)
 	local prev = JOB
 	JOB = nil
 	for _, t in pairs(T) do
-		for _, m in pairs(t) do
+		local _, m = next(t)
+		if m then
 			JOB = m
 			break
 		end
-		if JOB then
-			break
-		end
 	end
 	if JOB ~= prev and (force or now() - LAST >= IV) then
 		LAST = now()
 		R()
 	end
 end
+
 local G = a.nvim_create_augroup('STL5', { clear = true })
 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)
@@ -75,39 +64,32 @@ end)
 au({ 'LspAttach', 'LspDetach' }, function(e)
 	if e.event == 'LspDetach' then
 		T[e.data.client_id] = nil
-		SYNC(true)
+		sync(true)
 	end
 	touch(e.buf, true)
 end)
 au('LspProgress', function(e)
 	local v = e.data.params.value
-	if type(v) ~= 'table' then
-		return
-	end
 	local id, tk = e.data.client_id, e.data.params.token or 'default'
 	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
+		sync(true)
 	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
+		local title = (v.title and v.title ~= '') and v.title or nil
+		local msg = (v.message and v.message ~= '') and v.message or nil
+		T[id][tk] = (title and msg and (title .. ' ' .. msg)) or title or msg or 'Loading...'
+		sync()
 	end
 end)
-au('ColorScheme', R)
-au('FocusGained', R)
-local function Status()
+au({ 'ColorScheme', 'FocusGained' }, R)
+
+function _G.Status()
 	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
+		v.stl, v.d = v.h .. v.r, nil
 	end
-	return JOB and (v.h .. LOAD .. JOB .. '%* ') or v.stl
+	return JOB and (v.h .. '%#DiagnosticInfo#' .. JOB .. '%* ') or v.stl
 end
-_G.Status = Status
 vim.opt.statusline = '%!v:lua.Status()'