require'nvim-treesitter.configs'.setup {
  -- 安装 language parser
  -- :TSInstallInfo 命令查看支持的语言
  ensure_installed = {"vim", "lua", "javascript", "go", "php"},
  -- 启用代码高亮功能
  highlight = {
    enable = true,
    additional_vim_regex_highlighting = false
  },
  -- 启用增量选择
  incremental_selection = {
    enable = true,
    keymaps = {
      init_selection = '<CR>',
      node_incremental = '<CR>',
      node_decremental = '<BS>',
      scope_incremental = '<TAB>',
    }
  },
  -- 启用基于Treesitter的代码格式化(=) . NOTE: This is an experimental feature.
  indent = {
    enable = true
  }
}
-- 开启 Folding
vim.wo.foldmethod = 'expr'
vim.wo.foldexpr = 'nvim_treesitter#foldexpr()'
-- 默认不要折叠
-- https://stackoverflow.com/questions/8316139/how-to-set-the-default-to-unfolded-when-you-open-a-file
vim.wo.foldlevel = 99

-- Some servers have issues with backup files, see #649
vim.opt.backup = false
vim.opt.writebackup = false

-- Having longer updatetime (default is 4000 ms = 4s) leads to noticeable
-- delays and poor user experience
vim.opt.updatetime = 300

-- Always show the signcolumn, otherwise it would shift the text each time
-- diagnostics appeared/became resolved
vim.opt.signcolumn = "yes"

local keyset = vim.keymap.set
-- Autocomplete
function _G.check_back_space()
    local col = vim.fn.col('.') - 1
    return col == 0 or vim.fn.getline('.'):sub(col, col):match('%s') ~= nil
end

-- Use Tab for trigger completion with characters ahead and navigate
-- NOTE: There's always a completion item selected by default, you may want to enable
-- no select by setting `"suggest.noselect": true` in your configuration file
-- NOTE: Use command ':verbose imap <tab>' to make sure Tab is not mapped by
-- other plugins before putting this into your config
local opts = {silent = true, noremap = true, expr = true, replace_keycodes = false}
keyset("i", "<TAB>", 'coc#pum#visible() ? coc#pum#next(1) : v:lua.check_back_space() ? "<TAB>" : coc#refresh()', opts)
keyset("i", "<S-TAB>", [[coc#pum#visible() ? coc#pum#prev(1) : "\<C-h>"]], opts)
keyset("i", "<cr>", [[coc#pum#visible() ? coc#pum#confirm() : "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"]], opts)

-- GoTo code navigation
keyset("n", "<c-]>", "<Plug>(coc-definition)", {silent = true})
keyset("n", "<c-t>", "<Plug>(coc-type-definition)", {silent = true})
keyset("n", "gi", "<Plug>(coc-implementation)", {silent = true})
keyset("n", "gr", "<Plug>(coc-references)", {silent = true})

-- Use K to show documentation in preview window
function _G.show_docs()
    local cw = vim.fn.expand('<cword>')
    if vim.fn.index({'vim', 'help'}, vim.bo.filetype) >= 0 then
        vim.api.nvim_command('h ' .. cw)
    elseif vim.api.nvim_eval('coc#rpc#ready()') then
        vim.fn.CocActionAsync('doHover')
    else
        vim.api.nvim_command('!' .. vim.o.keywordprg .. ' ' .. cw)
    end
end
keyset("n", "K", '<CMD>lua _G.show_docs()<CR>', {silent = true})
-- Use <c-j> to trigger snippets
keyset("i", "<c-j>", "<Plug>(coc-snippets-expand-jump)")
-- Use <c-space> to trigger completion
keyset("i", "<c-space>", "coc#refresh()", {silent = true, expr = true})


require("formatter").setup({
  filetype = {
    php = {
      function()
        return {
		  exe = "php-cs-fixer",
    	  args = {
            "fix",
            "--config=/home/www/php/php-cs-fixer/config.php --allow-risky=yes"
    	  },
    	  stdin = false,
          ignore_exitcode = true,
        }
      end,
    }
  },
})

-- format on save
vim.api.nvim_exec(
  [[
    augroup FormatAutogroup
    autocmd!
    autocmd BufWritePost *.php FormatWrite
    augroup END
]],
  true
)