feat(ui): tab renaming (#848)

* ported over changes from previous pr

* Update lua/bufferline/commands.lua

Co-authored-by: Akin <[email protected]>

* Update lua/bufferline/tabpages.lua

Co-authored-by: Akin <[email protected]>

* change to use ui.refresh

---------

Co-authored-by: Muhmud Ahmad <[email protected]>
Co-authored-by: Akin <[email protected]>

doc/bufferline.txt

@@ -246,6 +246,14 @@ has a lot of the same features/styling but not all. A few things to note are
 * Sorting doesn't work yet as that needs to be thought through.
 * Grouping doesn't work yet as that also needs to be thought through.
 
+`BufferLineTabRename`
+
+Tabs can be renamed using the `BufferLineTabRename` command:
+
+e.g.
+
+- Rename the current tab: `BufferLineTabRename Code`
+- Rename a tab based on it's `tabnr`: `BufferLineTabRename 1 Code`
 
 ==============================================================================
 NUMBERS                                                    *bufferline-numbers*

lua/bufferline.lua

@@ -31,6 +31,7 @@ local M = {
   get_elements = commands.get_elements,
   close_with_pick = commands.close_with_pick,
   close_in_direction = commands.close_in_direction,
+  rename_tab = commands.rename_tab,
   close_others = commands.close_others,
   unpin_and_close = commands.unpin_and_close,
 
@@ -168,6 +169,7 @@ local function setup_commands()
   command("BufferLineSortByTabs", function() M.sort_by("tabs") end)
   command("BufferLineGoToBuffer", function(opts) M.go_to(opts.args) end, { nargs = 1 })
   command("BufferLineTogglePin", function() groups.toggle_pin() end, { nargs = 0 })
+  command("BufferLineTabRename", function(opts) M.rename_tab(opts.fargs) end, { nargs = '*' })
   command("BufferLineGroupClose", function(opts) groups.action(opts.args, "close") end, {
     nargs = 1,
     complete = groups.complete,

lua/bufferline/commands.lua

@@ -9,6 +9,7 @@ local config = lazy.require("bufferline.config") ---@module "bufferline.config"
 local groups = lazy.require("bufferline.groups") ---@module "bufferline.groups"
 local sorters = lazy.require("bufferline.sorters") ---@module "bufferline.sorters"
 local pick = lazy.require("bufferline.pick") ---@module "bufferline.pick"
+local tabpage = lazy.require("bufferline.tabpages") ---@module "bufferline.tabpages"
 
 local M = {}
 
@@ -264,6 +265,17 @@ function M.sort_by(sort_by)
   ui.refresh()
 end
 
+function M.rename_tab(args)
+  if #args == 0 then return end
+  local tabnr = tonumber(args[1])
+  local name = table.concat(args, " ", 2)
+  if not tabnr then
+    name = table.concat(args, " ")
+    tabnr = 0
+  end
+  tabpage.rename_tab(tabnr, name)
+end
+
 _G.___bufferline_private.handle_close = handle_close
 _G.___bufferline_private.handle_click = handle_click
 _G.___bufferline_private.handle_group_click = handle_group_click

lua/bufferline/tabpages.lua

@@ -21,7 +21,7 @@ local function render(tabpage, is_active, style, highlights)
   local hl = is_active and h.tab_selected.hl_group or h.tab.hl_group
   local separator_hl = is_active and h.tab_separator_selected.hl_group or h.tab_separator.hl_group
   local chars = constants.sep_chars[style] or constants.sep_chars.thin
-  local name = padding .. tabpage.tabnr .. padding
+  local name = padding .. (tabpage.variables.name or tabpage.tabnr) .. padding
   local char_order = ({ thick = { 1, 2 }, thin = { 1, 2 } })[style] or { 2, 1 }
   return {
     { highlight = separator_hl, text = chars[char_order[1]] },
@@ -34,6 +34,17 @@ local function render(tabpage, is_active, style, highlights)
   }
 end
 
+function M.rename_tab(tabnr, name)
+  if tabnr == 0 then
+    tabnr = vim.fn.tabpagenr()
+  end
+  if name == "" then
+    name = string(tabnr)
+  end
+  api.nvim_tabpage_set_var(tabnr, "name", name)
+  ui.refresh()
+end
+
 function M.get()
   local tabs = vim.fn.gettabinfo()
   local current_tab = vim.fn.tabpagenr()