feature to rename tabs (#574)

* (feat) add rename

* remove tabname if LualineRenameTab is ran without args

* document LualineRenameTab

Co-authored-by: shadmansaleh <13149513+shadmansaleh@users.noreply.github.com>

README.md

@@ -617,6 +617,24 @@ tabline = {
 }
 ```
 
+#### Buffers
+Shows currently open buffers. Like bufferline . See
+[buffers options](#buffers-component-options)
+for all builtin behaviors of buffers component.
+
+#### Tabs
+Shows currently open tab. Like usual tabline. See
+[tabs options](#tabs-component-options)
+for all builtin behaviors of tabs component.
+You can also use `:LualineRenameTab` to set a name for a tabpage.
+For example:
+```vim
+:LualineRenameTab Project_K
+````
+It's useful when you're using rendering mode 2/3 in tabs.
+To unname a tablage run `:LualineRenameTab` without argument.
+
+#### Tabline as statusline
 You can also completely move your statusline to a tabline by configuring
 `lualine.tabline` and disabling `lualine.sections` and `lualine.inactive_sections`:
 

doc/lualine.txt

@@ -645,10 +645,40 @@ more traditional tabline/bufferline.
 <
 
 
-You can also completely move your statusline to a tabline by configuring
+                                                             *lualine-Buffers*
-`lualine.tabline` and disabling `lualine.sections` and
+
+Buffers                                Shows currently open buffers. Like
+                                       bufferline. See
+                                       |lualine-buffers-options| for all
+                                       builtin behaviors of buffers component.
+
+
+                                                                *lualine-Tabs*
+
+Tabs                                   Shows currently open tab. Like usual
+                                       tabline. See |lualine-tabs-options| for
+                                       all builtin behaviors of tabs component.
+                                       You can also use `:LualineRenameTab` to
+                                       set a name for a tabpage. For example:
+
+
+>
+    :LualineRenameTab Project_K
+<
+
+
+It’s useful when you’re using rendering mode 2/3 in tabs. To unname a
+tablage run `:LualineRenameTab` without argument.
+
+                                               *lualine-Tabline-as-statusline*
+
+Tabline as statusline                  You can also completely move your
+                                       statusline to a tabline by configuring
+                                       `lualine.tabline` and disabling
+                                       `lualine.sections` and
                                        `lualine.inactive_sections`:
 
+
 >
     tabline = {
     ......

lua/lualine/components/tabs/init.lua

@@ -167,6 +167,17 @@ vim.cmd([[
   function! LualineSwitchTab(tabnr, mouseclicks, mousebutton, modifiers)
     execute a:tabnr . "tabnext"
   endfunction
+
+  function! LualineRenameTab(...)
+    if a:0 == 1
+      let t:tabname = a:1
+    else
+      unlet t:tabname
+    end
+    redrawtabline
+  endfunction
+
+  command! -nargs=? LualineRenameTab call LualineRenameTab("<args>")
 ]])
 
 return M

lua/lualine/components/tabs/tab.lua

@@ -14,6 +14,10 @@ end
 --- of the tab.
 ---@return string
 function Tab:label()
+  local custom_tabname = vim.t[self.tabnr].tabname
+  if custom_tabname and custom_tabname ~= '' then
+    return custom_tabname
+  end
   local buflist = vim.fn.tabpagebuflist(self.tabnr)
   local winnr = vim.fn.tabpagewinnr(self.tabnr)
   local bufnr = buflist[winnr]