feat; Added condition for more fine grained control over special bu…

…ffers

Closes #272

doc/preview_options.txt

@@ -35,6 +35,8 @@
     ---@field filetypes? string[]
     --- Buftypes that should be ignored(e.g. nofile).
     ---@field ignore_buftypes? string[]
+	--- Condition to check if a buffer should be attached or not.
+	---@field condition? fun(buffer: integer): boolean
     --- Maximum number of lines a buffer can have before switching to partial rendering.
     ---@field max_buf_lines? integer
     ---
@@ -749,6 +751,15 @@ ignore_buftypes ~
 List of buffer types to ignore when attaching to new buffers. Checked after
 the filetype.
 
+											 *markview.nvim-preview.condition*
+condition ~
+
+    - Type: `nil | fun(buffer: integer): boolean`
+    - Dynamic: false
+    - Default: nil
+
+Condition used to check if a buffer should be attached to or not.
+
                                          *markview.nvim-preview.max_buf_lines*
 max_buf_lines ~
 

lua/definitions/preview.lua

@@ -35,6 +35,8 @@ local M = {};
 ---@field filetypes? string[]
 --- Buftypes that should be ignored(e.g. nofile).
 ---@field ignore_buftypes? string[]
+--- Condition to check if a buffer should be attached or not.
+---@field condition? fun(buffer: integer): boolean
 --- Maximum number of lines a buffer can have before switching to partial rendering.
 ---@field max_buf_lines? integer
 ---

plugin/markview.lua

@@ -131,12 +131,16 @@ vim.api.nvim_create_autocmd({ "BufAdd", "BufEnter" }, {
 		local attach_ft = spec.get({ "preview", "filetypes" }, { fallback = {}, ignore_enable = true });
 		local ignore_bt = spec.get({ "preview", "ignore_buftypes" }, { fallback = {}, ignore_enable = true });
 
+		local condition = spec.get({ "preview", "condition" }, { eval_args = { buffer } });
+
 		if vim.list_contains(ignore_bt, bt) == true then
 			--- Ignored buffer type.
 			return;
 		elseif vim.list_contains(attach_ft, ft) == false then
 			--- Ignored file type.
 			return;
+		elseif condition == false then
+			return;
 		end
 
 		markview.actions.attach(buffer);