chore: allow configuring height

also fixes window management for top and bottom tree side

README.md

@@ -82,8 +82,10 @@ require'nvim-tree'.setup {
   },
 
   view = {
-    -- width of the window, can be either a number (columns) or a string in `%`
+    -- width of the window, can be either a number (columns) or a string in `%`, for left or right side placement
     width = 30,
+    -- height of the window, can be either a number (columns) or a string in `%`, for top or bottom side placement
+    height = 30,
     -- side of the tree, can be one of 'left' | 'right' | 'top' | 'bottom'
     side = 'left',
     -- if true the tree will resize itself after opening a file

doc/nvim-tree-lua.txt

@@ -90,6 +90,7 @@ function.
       },
       view = {
         width = 30,
+        height = 30,
         side = 'left',
         auto_resize = false,
         mappings = {
@@ -204,7 +205,12 @@ Here is a list of the options available in the setup call:
 - |view|: window / buffer setup
 
   - |view.width|: width of the window, can be either a `%` string or
-    a number representing columns
+    a number representing columns. Only works with |view.side| `left` or `right`
+      type: `string | number`
+      default: `30`
+
+  - |view.height|: height of the window, can be either a `%` string or
+    a number representing rows. Only works with |view.side| `top` or `bottom`
       type: `string | number`
       default: `30`
 

lua/nvim-tree.lua

@@ -270,6 +270,7 @@ end
 
 function M.resize(size)
   view.View.width = size
+  view.View.height = size
   view.resize()
 end
 

lua/nvim-tree/config.lua

@@ -80,14 +80,23 @@ end
 
 function M.window_options()
   local opts = {}
-  if vim.g.nvim_tree_side == 'right' then
+  local side = require'nvim-tree.view'.View.side
+  if side == 'right' then
     opts.open_command = 'h'
     opts.preview_command = 'l'
     opts.split_command = 'aboveleft'
-  else
+  elseif side == "left" then
     opts.open_command = 'l'
     opts.preview_command = 'h'
     opts.split_command = 'belowright'
+  elseif side == "top" then
+    opts.open_command = 'j'
+    opts.preview_command = 'k'
+    opts.split_command = 'bot'
+  else
+    opts.open_command = 'k'
+    opts.preview_command = 'j'
+    opts.split_command = 'top'
   end
 
   return opts

lua/nvim-tree/lib.lua

@@ -13,7 +13,6 @@ local populate = pops.populate
 local refresh_entries = pops.refresh_entries
 
 local first_init_done = false
-local window_opts = config.window_options()
 
 local M = {}
 
@@ -368,7 +367,9 @@ function M.open_file(mode, filename)
     if not target_winid or not vim.tbl_contains(win_ids, target_winid) then
       -- Target is invalid, or window does not exist in current tabpage: create
       -- new window
-      vim.cmd(window_opts.split_command .. " vsp")
+      local window_opts = config.window_options()
+      local splitside = view.is_vertical() and "vsp" or "sp"
+      vim.cmd(window_opts.split_command .. " " .. splitside)
       target_winid = api.nvim_get_current_win()
       M.Tree.target_winid = target_winid
 

lua/nvim-tree/view.lua

@@ -106,6 +106,7 @@ end
 
 local DEFAULT_CONFIG = {
   width = 30,
+  height = 30,
   side = 'left',
   auto_resize = false,
   mappings = {
@@ -141,6 +142,7 @@ function M.setup(opts)
   local options = vim.tbl_deep_extend('force', DEFAULT_CONFIG, opts)
   M.View.side = options.side
   M.View.width = options.width
+  M.View.height = options.height
   M.View.auto_resize = opts.auto_resize
   if options.mappings.custom_only then
     M.View.mappings = options.mappings.list
@@ -186,7 +188,8 @@ function M._prevent_buffer_override()
     end
 
     if #vim.api.nvim_list_wins() < 2 then
-      vim.cmd("vsplit")
+      local cmd = M.is_vertical() and "vsplit" or "split"
+      vim.cmd(cmd)
     else
       vim.cmd("wincmd "..move_cmd[M.View.side])
     end
@@ -228,12 +231,18 @@ function M.focus(winnr, open_if_closed)
   a.nvim_set_current_win(wnr)
 end
 
-local function get_width()
-  if type(M.View.width) == "number" then
-    return M.View.width
+function M.is_vertical()
+  return M.View.side == 'left' or M.View.side == 'right'
+end
+
+local function get_size()
+  local width_or_height = M.is_vertical() and 'width' or 'height'
+  local size = M.View[width_or_height]
+  if type(size) == "number" then
+    return size
   end
-  local width_as_number = tonumber(M.View.width:sub(0, -2))
-  local percent_as_decimal = width_as_number / 100
+  local size_as_number = tonumber(size:sub(0, -2))
+  local percent_as_decimal = size_as_number / 100
   return math.floor(vim.o.columns * percent_as_decimal)
 end
 
@@ -242,7 +251,11 @@ function M.resize()
     return
   end
 
-  a.nvim_win_set_width(M.get_winnr(), get_width())
+  if M.is_vertical() then
+    a.nvim_win_set_width(M.get_winnr(), get_size())
+  else
+    a.nvim_win_set_height(M.get_winnr(), get_size())
+  end
 end
 
 local move_tbl = {
@@ -268,7 +281,8 @@ end
 function M.replace_window()
   local move_to = move_tbl[M.View.side]
   a.nvim_command("wincmd "..move_to)
-  a.nvim_command("vertical resize "..get_width())
+  local resize_direction = M.is_vertical() and 'vertical ' or ''
+  a.nvim_command(resize_direction.."resize "..get_size())
 end
 
 local function open_window()