feat: add vinegar abilities to the tree

fixes #860

README.md

@@ -253,6 +253,7 @@ These are the default bindings:
 -- default mappings
 local list = {
   { key = {"<CR>", "o", "<2-LeftMouse>"}, action = "edit" },
+  { key = "<C-e>",                        action = "edit_in_place" },
   { key = {"O"},                          action = "edit_no_picker" },
   { key = {"<2-RightMouse>", "<C-]>"},    action = "cd" },
   { key = "<C-v>",                        action = "vsplit" },
@@ -293,9 +294,10 @@ You can toggle the help UI by pressing `g?`.
 
 ## Tips & reminders
 
-1. you can add a directory by adding a `/` at the end of the paths, entering multiple directories `BASE/foo/bar/baz` will add directory foo, then bar and add a file baz to it.
-2. you can update window options for the tree by setting `require"nvim-tree.view".View.winopts.MY_OPTION = MY_OPTION_VALUE`
+1. You can add a directory by adding a `/` at the end of the paths, entering multiple directories `BASE/foo/bar/baz` will add directory foo, then bar and add a file baz to it.
+2. You can update window options for the tree by setting `require"nvim-tree.view".View.winopts.MY_OPTION = MY_OPTION_VALUE`
 3. `toggle` has a second parameter which allows to toggle without focusing the explorer (`require"nvim-tree.toggle(false, false)`).
+4. You can allow nvim-tree to behave like vinegar (see `:help nvim-tree-vinegar`).
 
 
 ## Screenshots

doc/nvim-tree-lua.txt

@@ -585,7 +585,7 @@ INFORMATIONS				        *nvim-tree-info*
 - type `>` to navigate to the next sibling of current file/directory
 - type `J` to navigate to the first sibling of current file/directory
 - type `K` to navigate to the last sibling of current file/directory
-
+- type `<C-e>` to edit the file in place, effectively replacing the tree explorer.
 - if the file is a directory, <CR> will open the directory
 - otherwise it will open the file in the buffer near the tree
 - if the file is a symlink, <CR> will follow the symlink
@@ -605,6 +605,7 @@ Defaults to:
   lua <<EOF
     local list = {
       { key = {"<CR>", "o", "<2-LeftMouse>"}, action = "edit" },
+      { key = "<C-e>",                        action = "edit_in_place" },
       { key = {"O"},                          action = "edit_no_picker" },
       { key = {"<2-RightMouse>", "<C-]>"},    action = "cd" },
       { key = "<C-v>",                        action = "vsplit" },
@@ -745,7 +746,42 @@ NvimTreeFileNew
 NvimTreeFileDeleted
 
 ==============================================================================
-EVENTS                                                 *nvim-tree-events*
+vinegar style                                         *nvim-tree-vinegar*
+
+|nvim_tree_vinegar|                                     *nvim_tree_vinegar*
+
+nvim-tree can behave like vinegar. To allow this, you will need to configure
+it in a specific way:
+
+- Use `require"nvim-tree".open_replacing_current_buffer()` instead of the
+default open command.
+You can easily implement a toggle using this too:
+>
+    local function toggle_replace()
+      local view = require"nvim-tree.view"
+      if view.is_visible() then
+	require.close()
+      else
+	require"nvim-tree".open_replacing_current_buffer()
+      end
+    end
+<
+- Use the `edit_in_place` action to edit files. It's bound to `<C-e>` by
+default, vinegar uses `-`. You can override this with:
+>
+    require"nvim-tree".setup {
+      view = {
+        mappings = {
+          { key = "-", action = "edit_in_place" }
+        }
+      } 
+    }
+<
+You'll also need to set |nvim-tree.hijack_netrw| to `true` during setup.
+A good functionnality to enable is |nvim-tree.hijack_directories|.
+
+==============================================================================
+events                                                 *nvim-tree-events*
 
 |nvim_tree_events|                                     *nvim_tree_events*
 

lua/nvim-tree.lua

@@ -44,6 +44,25 @@ function M.open(cwd)
   end
 end
 
+function M.open_replacing_current_buffer()
+  if view.is_visible() then
+    return
+  end
+
+  local buf = api.nvim_get_current_buf()
+  local bufname = api.nvim_buf_get_name(buf)
+  if bufname == "" or vim.loop.fs_stat(bufname) == nil then
+    return
+  end
+
+  local cwd = vim.fn.fnamemodify(bufname, ':p:h')
+  if not TreeExplorer or cwd ~= TreeExplorer.cwd then
+    lib.init(cwd)
+  end
+  view.open_in_current_win({ hijack_current_buf = false, resize = false })
+  require"nvim-tree.renderer".draw()
+end
+
 function M.tab_change()
   if view.is_visible({ any_tabpage = true }) then
     local bufname = vim.api.nvim_buf_get_name(0)

lua/nvim-tree/actions/init.lua

@@ -8,7 +8,8 @@ local nvim_tree_callback = require'nvim-tree.config'.nvim_tree_callback
 local M = {
   mappings = {
     { key = {"<CR>", "o", "<2-LeftMouse>"}, action = "edit" },
-    { key = {"O"},                          action = "edit_no_picker" },
+    { key = "<C-e>",                        action = "edit_in_place" },
+    { key = "O",                            action = "edit_no_picker" },
     { key = {"<2-RightMouse>", "<C-]>"},    action = "cd" },
     { key = "<C-v>",                        action = "vsplit" },
     { key = "<C-x>",                        action = "split"},
@@ -96,9 +97,10 @@ function M.on_keypress(action)
     end
   elseif node.name == ".." then
     return require'nvim-tree.actions.change-dir'.fn("..")
-  elseif action == "cd" and node.nodes ~= nil then
-    return require'nvim-tree.actions.change-dir'.fn(lib.get_last_group_node(node).absolute_path)
   elseif action == "cd" then
+    if node.nodes ~= nil then
+      require'nvim-tree.actions.change-dir'.fn(lib.get_last_group_node(node).absolute_path)
+    end
     return
   end
 

lua/nvim-tree/actions/open-file.lua

@@ -154,6 +154,12 @@ function M.fn(mode, filename)
     return
   end
 
+  if mode == "edit_in_place" then
+    vim.cmd("edit " .. vim.fn.fnameescape(filename))
+    require"nvim-tree.view".abandon_current_window()
+    return
+  end
+
   local tabpage = api.nvim_get_current_tabpage()
   local win_ids = api.nvim_tabpage_list_wins(tabpage)
 

lua/nvim-tree/view.lua

@@ -194,12 +194,20 @@ local function set_current_win()
   M.View.tabpages[current_tab] = { winnr = a.nvim_get_current_win() }
 end
 
-function M.open_in_current_win()
-  create_buffer(a.nvim_get_current_buf())
+function M.open_in_current_win(opts)
+  opts = opts or { hijack_current_buf = true, resize = true }
+  create_buffer(opts.hijack_current_buf and a.nvim_get_current_buf())
   set_current_win()
   set_window_options_and_buffer()
-  M.reposition_window()
-  M.resize()
+  if opts.resize then
+    M.reposition_window()
+    M.resize()
+  end
+end
+
+function M.abandon_current_window()
+  local tab = a.nvim_get_current_tabpage()
+  M.View.tabpages[tab] = { winnr = nil }
 end
 
 function M.is_visible(opts)