Version 1.5.0

* Fix table concat bug
* Add `setup_buffer`

lua/virt-column/init.lua

@@ -1,3 +1,4 @@
+local utils = require "virt-column.utils"
 local ffi = require "ffi"
 
 ffi.cdef "int curwin_col_off(void);"
@@ -7,6 +8,7 @@ local M = {
         char = "┃",
         virtcolumn = "",
     },
+    buffer_config = {},
 }
 
 M.clear_buf = function(bufnr)
@@ -33,6 +35,11 @@ M.setup = function(config)
     ]]
 end
 
+M.setup_buffer = function(config)
+    M.buffer_config[vim.api.nvim_get_current_buf()] = config
+    M.refresh()
+end
+
 M.refresh = function()
     local bufnr = vim.api.nvim_get_current_buf()
 
@@ -40,11 +47,12 @@ M.refresh = function()
         return
     end
 
+    local config = vim.tbl_deep_extend("force", M.config, M.buffer_config[bufnr] or {})
     local winnr = vim.api.nvim_get_current_win()
     local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
     local width = vim.api.nvim_win_get_width(winnr) - ffi.C.curwin_col_off()
     local textwidth = vim.opt.textwidth:get()
-    local colorcolumn = { unpack(vim.opt.colorcolumn:get()), unpack(vim.split(M.config.virtcolumn, ",")) }
+    local colorcolumn = utils.concat_table(vim.opt.colorcolumn:get(), vim.split(config.virtcolumn, ","))
 
     for i, c in ipairs(colorcolumn) do
         if vim.startswith(c, "+") then
@@ -67,7 +75,7 @@ M.refresh = function()
             local line = lines[i]:gsub("\t", string.rep(" ", vim.opt.tabstop:get()))
             if width > column and vim.api.nvim_strwidth(line) < column then
                 vim.api.nvim_buf_set_extmark(bufnr, M.namespace, i - 1, 0, {
-                    virt_text = { { M.config.char, "VirtColumn" } },
+                    virt_text = { { config.char, "VirtColumn" } },
                     virt_text_pos = "overlay",
                     hl_mode = "combine",
                     virt_text_win_col = column - 1,