nvim/lua/plugins/typst.lua

local function parse_stderr(data)
  local message = table.concat(data, "\n")
  local level = "info"
  
  -- Check each line for error or warning
  for line in message:gmatch("[^\r\n]+") do
    local lower_line = line:lower()
    if lower_line:match("^%s*error:") then
      level = "error"
      break
    elseif lower_line:match("^%s*warning:") then
      level = "warn"
      -- Don't break here, in case an error appears later
    end
  end
  
  return message, level
end


local function typst_build_and_open_sioyek()
  local bufname = vim.fn.expand('%:p')
  local pdf_path = vim.fn.fnamemodify(bufname, ':r') .. '.pdf'
  local cmd = string.format('typst compile "%s"', bufname)

  vim.fn.jobstart(cmd, {
    on_exit = function(_, exit_code)
      if exit_code == 0 then
        vim.notify("Typst build completed successfully", vim.log.levels.INFO, {
          title = "Typst Build",
          timeout = 3000,
        })
        
        -- Now open or reload Sioyek
        local sioyek_running = vim.fn.system('pgrep sioyek'):match('%d+')
        
        if sioyek_running then
          vim.fn.system('sioyek --execute-command reload_no_flicker')
          vim.notify("Sioyek reloaded", vim.log.levels.INFO, {
            title = "Sioyek",
            timeout = 2000,
          })
        else
          vim.fn.jobstart('sioyek "' .. pdf_path .. '"', {
            on_exit = function(_, sioyek_exit_code)
              if sioyek_exit_code == 0 then
                vim.notify("Sioyek opened", vim.log.levels.INFO, {
                  title = "Sioyek",
                  timeout = 2000,
                })
              else
                vim.notify("Failed to open Sioyek", vim.log.levels.ERROR, {
                  title = "Sioyek",
                  timeout = 3000,
                })
              end
            end
          })
        end
      else
        vim.notify("Typst build failed", vim.log.levels.ERROR, {
          title = "Typst Build",
          timeout = 5000,
        })
      end
    end,
    stderr_buffered = true,
    on_stderr = function(_, data)
      if data and #data > 0 then
        local message, level = parse_stderr(data)
        vim.notify(message, vim.log.levels[level:upper()], {
          title = "Typst Build",
          timeout = 5000,
        })
      end
    end,
  })
end

vim.api.nvim_create_user_command('TypstBuild', typst_build_and_open_sioyek, {})

-- Create an autocommand group
local typst_group = vim.api.nvim_create_augroup('TypstBuildGroup', { clear = true })

-- Create a command to toggle the autocommand
local typst_auto_build_enabled = false

-- Function to create the autocommand
local function create_typst_autocmd()
  vim.api.nvim_create_autocmd('BufWritePost', {
    group = typst_group,
    pattern = '*.typ',
    callback = function()
      vim.cmd('TypstBuild')
    end,
  })
end

-- Create a command to toggle the autocommand
vim.api.nvim_create_user_command('TypstAutoBuild', function()
  typst_auto_build_enabled = not typst_auto_build_enabled
  if typst_auto_build_enabled then
    create_typst_autocmd()
    vim.notify('Typst auto-build enabled', vim.log.levels.INFO)
  else
    vim.api.nvim_clear_autocmds({ group = typst_group })
    vim.notify('Typst auto-build disabled', vim.log.levels.INFO)
  end
end, {})

return {
	-- { "kaarmu/typst.vim", ft = "typst", lazy = false },
	-- {
	-- 	"chomosuke/typst-preview.nvim",
	-- 	lazy = false, -- or ft = 'typst'
	-- 	version = "0.3.*",
	-- 	config = function()
	-- 		require("typst-preview").setup({
	-- 			-- Setting this true will enable printing debug information with print()
	-- 			debug = false,
	--
	-- 			-- Custom format string to open the output link provided with %s
	-- 			-- Example: open_cmd = 'firefox %s -P typst-preview --class typst-preview'
	-- 			open_cmd = 'sioyek --execute-command reload_no_flicker %s',
	--
	-- 			-- Setting this to 'always' will invert black and white in the preview
	-- 			-- Setting this to 'auto' will invert depending if the browser has enable
	-- 			-- dark mode
	-- 			invert_colors = "never",
	--
	-- 			-- Whether the preview will follow the cursor in the source file
	-- 			follow_cursor = true,
	--
	-- 			-- Provide the path to binaries for dependencies.
	-- 			-- Setting this will skip the download of the binary by the plugin.
	-- 			-- Warning: Be aware that your version might be older than the one
	-- 			-- required.
	-- 			dependencies_bin = {
	-- 				-- if you are using tinymist, just set ['typst-preview'] = "tinymist".
	-- 				["typst-preview"] = nil,
	-- 				["websocat"] = nil,
	-- 			},
	--
	-- 			-- This function will be called to determine the root of the typst project
	-- 			get_root = function(path_of_main_file)
	-- 				return vim.fn.fnamemodify(path_of_main_file, ":p:h")
	-- 			end,
	--
	-- 			-- This function will be called to determine the main file of the typst
	-- 			-- project.
	-- 			get_main_file = function(path_of_buffer)
	-- 				return path_of_buffer
	-- 			end,
	-- 		})
	-- 	end,
	-- 	build = function()
	-- 		require("typst-preview").update()
	-- 	end,
	-- },
}