fix(filename): include window_width to space estimation & expose

shorting_target option

setting shorting target to 0 disables path shorting
closes #8

Co-authored-by: NullVoxPopuli <LPSego3+dev@gmail.com>

README.md

@@ -320,7 +320,9 @@ sections = {
     {
       'filename',
       file_status = true, -- displays file status (readonly status, modified status)
-      path = 0 -- 0 = just filename, 1 = relative path, 2 = absolute path
+      path = 0, -- 0 = just filename, 1 = relative path, 2 = absolute path
+      shorting_target = 40 -- Shortens path to leave 40 space in the window
+                           -- for other components. Terrible name any suggestions?
     }
   }
 }

doc/lualine.txt

@@ -252,6 +252,8 @@ Component specific local options~
         'filename',
         file_status = true, -- displays file status (readonly status, modified status)
         path = 0 -- 0 = just filename, 1 = relative path, 2 = absolute path
+        shorting_target = 40 -- Shortens path to leave 40 space in the window
+                             -- for other components. Terrible name any suggestions?
       }
     }
   }

lua/lualine/components/filename.lua

@@ -24,6 +24,9 @@ FileName.new = function(self, options, child)
     new_instance.options.file_status = true
   end
   if new_instance.options.path == nil then new_instance.options.path = 0 end
+  if new_instance.options.shorting_target == nil then
+    new_instance.options.shorting_target = 40
+  end
 
   return new_instance
 end
@@ -43,14 +46,17 @@ FileName.update_status = function(self)
 
   if data == '' then data = '[No Name]' end
 
+  if self.options.shorting_target ~= 0 then
     local windwidth = vim.fn.winwidth(0)
-  local estimated_space_available = 40
+    local estimated_space_available = windwidth - self.options.shorting_target
+
     local path_separator = package.config:sub(1, 1)
     for _ = 0, count(data, path_separator) do
       if windwidth <= 84 or #data > estimated_space_available then
         data = shorten_path(data, path_separator)
       end
     end
+  end
 
   if self.options.file_status then
     if vim.bo.modified then