feat: add name+parent path option for component(filename) (#945)

Co-authored-by: Mika Raunio <mika@diago.global>

README.md

@@ -626,6 +626,7 @@ sections = {
                                -- 1: Relative path
                                -- 2: Absolute path
                                -- 3: Absolute path, with tilde as the home directory
+                               -- 4: Filename and parent dir, with tilde as the home directory
 
       shorting_target = 40,    -- Shortens path to leave 40 spaces in the window
                                -- for other components. (terrible name, any suggestions?)

lua/lualine/components/filename.lua

@@ -50,12 +50,24 @@ local function shorten_path(path, sep, max_len)
   return table.concat(segments, sep)
 end
 
+local function filename_and_parent(path, sep)
+  local segments = vim.split(path, sep)
+  if #segments == 0 then
+    return path
+  elseif #segments == 1 then
+    return segments[#segments]
+  else
+    return table.concat({segments[#segments - 1], segments[#segments]}, sep)
+  end
+end
+
 M.init = function(self, options)
   M.super.init(self, options)
   self.options = vim.tbl_deep_extend('keep', self.options or {}, default_options)
 end
 
 M.update_status = function(self)
+  local path_separator = package.config:sub(1, 1)
   local data
   if self.options.path == 1 then
     -- relative path
@@ -66,6 +78,9 @@ M.update_status = function(self)
   elseif self.options.path == 3 then
     -- absolute path, with tilde
     data = vim.fn.expand('%:p:~')
+  elseif self.options.path == 4 then
+    -- filename and immediate parent
+    data = filename_and_parent(vim.fn.expand('%:p:~'), path_separator)
   else
     -- just filename
     data = vim.fn.expand('%:t')
@@ -81,7 +96,6 @@ M.update_status = function(self)
     local windwidth = self.options.globalstatus and vim.go.columns or vim.fn.winwidth(0)
     local estimated_space_available = windwidth - self.options.shorting_target
 
-    local path_separator = package.config:sub(1, 1)
     data = shorten_path(data, path_separator, estimated_space_available)
   end