feat(view): add view.width.min/max replacing adaptive_size, allowing upper bound (#1915)

* feat: max_width for adaptive_size

* view grow calculates size correctly based on sign column visibility

* limit width to a minimum of 20

* adaptive_size -> min/max table

* harden view size calculations against bad user input

* style

* add back an extra column of padding to adaptive resizing

* back out: limit width to a minimum of 20

* revert unnecessary change

* backout: view grow calculates size correctly based on sign column visibility

* remove adaptive_size from help

* backout unnecessary change M.View.config

Co-authored-by: Alexander Courtis <alex@courtis.org>

lua/nvim-tree/legacy.lua

@@ -30,6 +30,17 @@ local function refactored(opts)
 
   -- 2023/01/08
   utils.move_missing_val(opts, "trash", "require_confirm", opts, "ui.confirm", "trash", true)
+
+  -- 2023/01/15
+  if opts.view and opts.view.adaptive_size ~= nil then
+    if opts.view.adaptive_size and type(opts.view.width) ~= "table" then
+      local width = opts.view.width
+      opts.view.width = {
+        min = width,
+      }
+    end
+    opts.view.adaptive_size = nil
+  end
 end
 
 local function removed(opts)

lua/nvim-tree/view.lua

@@ -4,6 +4,9 @@ local events = require "nvim-tree.events"
 local utils = require "nvim-tree.utils"
 local log = require "nvim-tree.log"
 
+local DEFAULT_MIN_WIDTH = 30
+local DEFAULT_MAX_WIDTH = -1
+
 M.View = {
   adaptive_size = false,
   centralize_selection = false,
@@ -98,8 +101,8 @@ local function create_buffer(bufnr)
   events._dispatch_tree_attached_post(M.get_bufnr())
 end
 
-local function get_size()
-  local size = M.View.width
+local function get_size(size)
+  size = size or M.View.width
   if type(size) == "number" then
     return size
   elseif type(size) == "function" then
@@ -246,14 +249,29 @@ end
 local function grow()
   local starts_at = M.is_root_folder_visible(require("nvim-tree.core").get_cwd()) and 1 or 0
   local lines = vim.api.nvim_buf_get_lines(M.get_bufnr(), starts_at, -1, false)
-  local max_length = M.View.initial_width
+  -- 1 column of right-padding to indicate end of path
+  local padding = 3
+  local resizing_width = M.View.initial_width - padding
+  local max_width
+
+  -- maybe bound max
+  if M.View.max_width == -1 then
+    max_width = -1
+  else
+    max_width = get_size(M.View.max_width) - padding
+  end
+
   for _, l in pairs(lines) do
-    local count = vim.fn.strchars(l) + 3 -- plus some padding
-    if max_length < count then
-      max_length = count
+    local count = vim.fn.strchars(l)
+    if resizing_width < count then
+      resizing_width = count
+    end
+    if M.View.adaptive_size and max_width >= 0 and resizing_width >= max_width then
+      resizing_width = max_width
+      break
     end
   end
-  M.resize(max_length)
+  M.resize(resizing_width + padding)
 end
 
 function M.grow_from_content()
@@ -482,12 +500,9 @@ end
 
 function M.setup(opts)
   local options = opts.view or {}
-  M.View.adaptive_size = options.adaptive_size
   M.View.centralize_selection = options.centralize_selection
   M.View.side = (options.side == "right") and "right" or "left"
-  M.View.width = options.width
   M.View.height = options.height
-  M.View.initial_width = get_size()
   M.View.hide_root_folder = options.hide_root_folder
   M.View.tab = opts.tab
   M.View.preserve_window_proportions = options.preserve_window_proportions
@@ -497,6 +512,17 @@ function M.setup(opts)
   M.View.winopts.signcolumn = options.signcolumn
   M.View.float = options.float
   M.on_attach = opts.on_attach
+
+  if type(options.width) == "table" then
+    M.View.adaptive_size = true
+    M.View.width = options.width.min or DEFAULT_MIN_WIDTH
+    M.View.max_width = options.width.max or DEFAULT_MAX_WIDTH
+  else
+    M.View.adaptive_size = false
+    M.View.width = options.width
+  end
+
+  M.View.initial_width = get_size()
 end
 
 return M