chore: rewrite buffer/window handling into view file (#287)

lua/nvim-tree/view.lua

@@ -0,0 +1,152 @@
+local a = vim.api
+
+local M = {}
+
+function M.nvim_tree_callback(callback_name)
+  return string.format(":lua require'nvim-tree'.on_keypress('%s')<CR>", callback_name)
+end
+
+M.View = {
+  bufnr = nil,
+  winnr = nil,
+  width = 30,
+  side = 'left',
+  auto_resize = false,
+  winopts = {
+    relativenumber = false,
+    number = false,
+    list = false,
+    winfixwidth = true,
+    winfixheight = true,
+    foldenable = false,
+    spell = false,
+    signcolumn = 'yes',
+    foldmethod = 'manual',
+    foldcolumn = '0',
+    winhl = 'EndOfBuffer:NvimTreeEndOfBuffer,Normal:NvimTreeNormal,CursorLine:NvimTreeCursorLine,VertSplit:NvimTreeVertSplit'
+  },
+  bufopts = {
+    swapfile = false,
+    buftype = 'nofile';
+    modifiable = false;
+    filetype = 'NvimTree';
+  },
+  bindings = {
+    ["<CR>"]           = M.nvim_tree_callback("edit"),
+    ["o"]              = M.nvim_tree_callback("edit"),
+    ["<2-LeftMouse>"]  = M.nvim_tree_callback("edit"),
+    ["<2-RightMouse>"] = M.nvim_tree_callback("cd"),
+    ["<C-]>"]          = M.nvim_tree_callback("cd"),
+    ["<C-v>"]          = M.nvim_tree_callback("vsplit"),
+    ["<C-x>"]          = M.nvim_tree_callback("split"),
+    ["<C-t>"]          = M.nvim_tree_callback("tabnew"),
+    ["<"]              = M.nvim_tree_callback("prev_sibling"),
+    [">"]              = M.nvim_tree_callback("next_sibling"),
+    ["P"]              = M.nvim_tree_callback("parent_node"),
+    ["<BS>"]           = M.nvim_tree_callback("close_node"),
+    ["<S-CR>"]         = M.nvim_tree_callback("close_node"),
+    ["<Tab>"]          = M.nvim_tree_callback("preview"),
+    ["K"]              = M.nvim_tree_callback("first_sibling"),
+    ["J"]              = M.nvim_tree_callback("last_sibling"),
+    ["I"]              = M.nvim_tree_callback("toggle_ignored"),
+    ["H"]              = M.nvim_tree_callback("toggle_dotfiles"),
+    ["R"]              = M.nvim_tree_callback("refresh"),
+    ["a"]              = M.nvim_tree_callback("create"),
+    ["d"]              = M.nvim_tree_callback("remove"),
+    ["r"]              = M.nvim_tree_callback("rename"),
+    ["<C-r>"]          = M.nvim_tree_callback("full_rename"),
+    ["x"]              = M.nvim_tree_callback("cut"),
+    ["c"]              = M.nvim_tree_callback("copy"),
+    ["p"]              = M.nvim_tree_callback("paste"),
+    ["[c"]             = M.nvim_tree_callback("prev_git_item"),
+    ["]c"]             = M.nvim_tree_callback("next_git_item"),
+    ["-"]              = M.nvim_tree_callback("dir_up"),
+    ["q"]              = M.nvim_tree_callback("close"),
+  }
+}
+
+-- set user options and create tree buffer (should never be wiped)
+function M.setup()
+  M.View.bindings = vim.tbl_extend(
+    'force',
+    M.View.bindings,
+    vim.g.nvim_tree_bindings or {}
+  )
+  M.View.auto_resize = vim.g.nvim_tree_auto_resize or M.View.auto_resize
+  M.View.side = vim.g.nvim_tree_side or M.View.side
+  M.View.width = vim.g.nvim_tree_width or M.View.width
+
+  M.View.bufnr = a.nvim_create_buf(false, false)
+  for k, v in pairs(M.View.bufopts) do
+    a.nvim_buf_set_option(M.View.bufnr, k, v)
+  end
+  a.nvim_buf_set_name(M.View.bufnr, 'NvimTree')
+
+  if not vim.g.nvim_tree_disable_keybindings then
+    for key, cb in pairs(M.View.bindings) do
+      a.nvim_buf_set_keymap(M.View.bufnr, 'n', key, cb, { noremap = true, silent = true })
+    end
+  end
+end
+
+function M.win_open()
+  return M.View.winnr ~= nil and a.nvim_win_is_valid(M.View.winnr)
+end
+
+function M.set_cursor(opts)
+  if M.win_open() then
+    a.nvim_win_set_cursor(M.View.winnr, opts)
+  end
+end
+
+function M.focus(winnr, open_if_closed)
+  local wnr = winnr or M.View.winnr
+
+  if a.nvim_win_get_tabpage(wnr) ~= a.nvim_win_get_tabpage(0) then
+    M.close()
+    M.open()
+    wnr = M.View.winnr
+  elseif open_if_closed and not M.win_open() then
+    M.open()
+  end
+
+  a.nvim_set_current_win(wnr)
+end
+
+function M.resize()
+  if not M.View.auto_resize then
+    return
+  end
+
+  a.nvim_win_set_width(M.View.winnr, M.View.width)
+end
+
+local move_tbl = {
+  left = 'H',
+  right = 'L',
+  bottom = 'J',
+  top = 'K',
+}
+
+function M.open()
+  a.nvim_command("vsplit")
+  local move_to = move_tbl[M.View.side]
+  a.nvim_command("wincmd "..move_to)
+  a.nvim_command("vertical resize "..M.View.width)
+  M.View.winnr = a.nvim_get_current_win()
+  for k, v in pairs(M.View.winopts) do
+    a.nvim_win_set_option(M.View.winnr, k, v)
+  end
+  a.nvim_win_set_buf(M.View.winnr, M.View.bufnr)
+  vim.cmd ":wincmd ="
+end
+
+function M.close()
+  if not M.win_open() then return end
+  if #a.nvim_list_wins() == 1 then
+    return vim.cmd ':q!'
+  end
+  a.nvim_win_hide(M.View.winnr)
+end
+
+return M