feat: allow manage_folds to be a filetype map

README.md

@@ -337,6 +337,11 @@ require("aerial").setup({
     wintypes = "special",
   },
 
+  -- Use symbol tree for folding. Set to true or false to enable/disable
+  -- Set to "auto" to manage folds if your previous foldmethod was 'manual'
+  -- This can be a filetype map (see :help aerial-filetype-map)
+  manage_folds = false,
+
   -- When you fold code with za, zo, or zc, update the aerial tree as well.
   -- Only works when manage_folds = true
   link_folds_to_tree = false,
@@ -345,10 +350,6 @@ require("aerial").setup({
   -- Only works when manage_folds = true
   link_tree_to_folds = true,
 
-  -- Use symbol tree for folding. Set to true or false to enable/disable
-  -- 'auto' will manage folds if your previous foldmethod was 'manual'
-  manage_folds = false,
-
   -- Set default symbol icons to use patched font icons (see https://www.nerdfonts.com/)
   -- "auto" will set it to true if nvim-web-devicons or lspkind-nvim is installed.
   nerd_font = "auto",

doc/aerial.txt

@@ -177,6 +177,11 @@ OPTIONS                                                           *aerial-option
         wintypes = "special",
       },
     
+      -- Use symbol tree for folding. Set to true or false to enable/disable
+      -- Set to "auto" to manage folds if your previous foldmethod was 'manual'
+      -- This can be a filetype map (see :help aerial-filetype-map)
+      manage_folds = false,
+    
       -- When you fold code with za, zo, or zc, update the aerial tree as well.
       -- Only works when manage_folds = true
       link_folds_to_tree = false,
@@ -185,10 +190,6 @@ OPTIONS                                                           *aerial-option
       -- Only works when manage_folds = true
       link_tree_to_folds = true,
     
-      -- Use symbol tree for folding. Set to true or false to enable/disable
-      -- 'auto' will manage folds if your previous foldmethod was 'manual'
-      manage_folds = false,
-    
       -- Set default symbol icons to use patched font icons (see https://www.nerdfonts.com/)
       -- "auto" will set it to true if nvim-web-devicons or lspkind-nvim is installed.
       nerd_font = "auto",

lua/aerial/config.lua

@@ -163,6 +163,11 @@ local default_options = {
     wintypes = "special",
   },
 
+  -- Use symbol tree for folding. Set to true or false to enable/disable
+  -- Set to "auto" to manage folds if your previous foldmethod was 'manual'
+  -- This can be a filetype map (see :help aerial-filetype-map)
+  manage_folds = false,
+
   -- When you fold code with za, zo, or zc, update the aerial tree as well.
   -- Only works when manage_folds = true
   link_folds_to_tree = false,
@@ -171,10 +176,6 @@ local default_options = {
   -- Only works when manage_folds = true
   link_tree_to_folds = true,
 
-  -- Use symbol tree for folding. Set to true or false to enable/disable
-  -- 'auto' will manage folds if your previous foldmethod was 'manual'
-  manage_folds = false,
-
   -- Set default symbol icons to use patched font icons (see https://www.nerdfonts.com/)
   -- "auto" will set it to true if nvim-web-devicons or lspkind-nvim is installed.
   nerd_font = "auto",
@@ -479,12 +480,6 @@ M.setup = function(opts)
     newconf.use_lspkind = true
   end
 
-  -- If not managing folds, don't link either direction
-  if newconf.manage_folds == false then
-    newconf.link_tree_to_folds = false
-    newconf.link_folds_to_tree = false
-  end
-
   -- for backwards compatibility
   for k, _ in pairs(default_options.lsp) do
     if newconf[k] ~= nil then
@@ -538,6 +533,7 @@ M.setup = function(opts)
   for k, v in pairs(newconf) do
     M[k] = v
   end
+  M.manage_folds = create_filetype_opt_getter(M.manage_folds, default_options.manage_folds)
   M.backends = create_filetype_opt_getter(M.backends, default_options.backends)
   local get_filter_kind_list =
     create_filetype_opt_getter(M.filter_kind, default_options.filter_kind)

lua/aerial/data.lua

@@ -20,21 +20,26 @@ local config = require("aerial.config")
 ---@field children? aerial.Symbol[]
 
 ---@class aerial.BufData
+---@field bufnr integer
 ---@field items aerial.Symbol[]
 ---@field positions any
 ---@field last_win integer
 ---@field collapsed table<string, boolean>
 ---@field collapse_level integer
 local BufData = {}
 
-function BufData.new()
+---@param bufnr integer
+function BufData.new(bufnr)
   local new = {
+    bufnr = bufnr,
     items = {},
     positions = {},
     last_win = -1,
     collapsed = {},
     collapse_level = 99,
   }
+  -- cache the evaluation of managing folds
+  new.manage_folds = config.manage_folds(bufnr)
   setmetatable(new, { __index = BufData })
   return new
 end
@@ -98,7 +103,7 @@ end
 ---@param item aerial.Symbol
 ---@return boolean
 function BufData:is_collapsable(item)
-  return config.manage_folds or (item.children and not vim.tbl_isempty(item.children))
+  return self.manage_folds or (item.children and not vim.tbl_isempty(item.children))
 end
 
 ---@generic T
@@ -166,19 +171,14 @@ local buf_to_symbols = {}
 
 local M = {}
 
----@return aerial.BufData
-function M.create()
-  return BufData.new()
-end
-
 ---@param buf nil|integer
 ---@return aerial.BufData
 function M.get_or_create(buf)
   buf = buf or 0
   local bufnr, _ = util.get_buffers(buf)
   local bufdata = buf_to_symbols[bufnr]
   if not bufdata then
-    bufdata = BufData.new()
+    bufdata = BufData.new(bufnr)
     if bufnr then
       buf_to_symbols[bufnr] = bufdata
     end

lua/aerial/fold.lua

@@ -6,7 +6,7 @@ local M = {}
 ---@param bufnr nil|integer
 M.add_fold_mappings = function(bufnr)
   bufnr = bufnr or 0
-  if config.link_folds_to_tree then
+  if config.manage_folds(bufnr) and config.link_folds_to_tree then
     local aerial = require("aerial")
     local tree = require("aerial.tree")
     vim.keymap.set("n", "za", tree.toggle, { buffer = bufnr })
@@ -98,7 +98,7 @@ M.restore_foldmethod = function()
 end
 
 M.maybe_set_foldmethod = function(bufnr)
-  local manage_folds = config.manage_folds
+  local manage_folds = config.manage_folds(bufnr)
   if not manage_folds then
     return
   end