Run biome linter and send result to quickfix list

autocmds.lua

local function find_biome_executable()
	local cwd = vim.fn.getcwd()

	-- Check for local biome executable in node_modules
	local paths_to_check = {
		cwd .. "/node_modules/.bin/biome",
		cwd .. "/../node_modules/.bin/biome",
		cwd .. "/../../node_modules/.bin/biome",
	}

	for _, path in ipairs(paths_to_check) do
		if vim.fn.executable(path) == 1 then
			return path
		end
	end

	-- Fallback to npx if not found
	return "npx @biomejs/biome"
end


-- Run biome lint and send report to quickfix
local function biome_lint()
	local file = vim.fn.expand("%")
	local biome_cmd = find_biome_executable()

	print("🚀 Launching Biome's linter")

	-- Redirect stderr to /dev/null to hide the warning
	local cmd = biome_cmd .. " lint --diagnostic-level=error --reporter=json"
	if file then
		cmd = cmd .. " " .. vim.fn.shellescape(file)
	end
	cmd = cmd .. " 2>/dev/null"

  	local output = vim.fn.system(cmd)

	if vim.trim(output) == "" then
		print("No Biome issues found")
		vim.fn.setqflist({})
		return
	end

	local ok, json_data = pcall(vim.fn.json_decode, output)
	if not ok then
		print("Failed to parse Biome JSON output")
		return
	end

	local qf_list = {}

	if json_data.diagnostics then
		for _, diagnostic in ipairs(json_data.diagnostics) do
			local location = diagnostic.location
			if location and location.path then
				-- Parse line/column from span and source code
				local line = 1
				local col = 1

				if location.span and location.sourceCode then
					local start_pos = location.span[1]
					local source_lines = vim.split(location.sourceCode, "\n")
					local char_count = 0

					for line_num, line_content in ipairs(source_lines) do
						if char_count + #line_content >= start_pos then
							line = line_num
							col = start_pos - char_count + 1
							break
						end
						char_count = char_count + #line_content + 1 -- +1 for newline
					end
				end

				table.insert(qf_list, {
					filename = location.path.file,
					lnum = line,
					col = col,
					type = diagnostic.severity == "error" and "E" or "W",
					text = diagnostic.category .. ": " .. diagnostic.description,
				})
			end
		end
	end

	vim.fn.setqflist(qf_list)
	if #qf_list > 0 then
		vim.cmd("copen")
		print("Found " .. #qf_list .. " Biome issue(s)")
	else
		print("No Biome issues found")
	end
end

vim.api.nvim_create_user_command("BiomeLint", biome_lint, {})