feat: support gitsigns

lua/hardline/parts/git.lua

@@ -1,5 +1,6 @@
 local fn = vim.fn
 local g = vim.g
+local b = vim.b
 local fmt = string.format
 
 local function get_hunks()
@@ -11,6 +12,12 @@ local function get_hunks()
     if (summary[1] == -1) then -- signify returns {-1, -1, -1} in empty buffer
       return ''
     end
+  elseif b.gitsigns_status_dict ~= nil then
+    local status_dict = b.gitsigns_status_dict
+    if status_dict.added == nil then
+      return ''
+    end
+    summary = {status_dict.added, status_dict.changed, status_dict.removed}
   else
     return ''
   end
@@ -29,6 +36,8 @@ local function get_branch()
     branch = fn['gina#component#repo#branch']()
   elseif g.loaded_gitbranch then
     branch = fn['gitbranch#name']()
+  elseif b.gitsigns_head ~= nil then
+    branch = b.gitsigns_head
   end
   return branch ~= '' and fmt('(%s)', branch) or ''
 end