Modify code for better readability

autoload/vundle/installer.vim

@@ -201,17 +201,18 @@ endf
 
 func! s:sync(bang, bundle) abort
   let git_dir = expand(a:bundle.path().'/.git/', 1)
+  let bundle_path = shellescape(a:bundle.path())
   if isdirectory(git_dir) || filereadable(expand(a:bundle.path().'/.git', 1))
     if !(a:bang) | return 'todate' | endif
-    let cmd = 'cd '.shellescape(a:bundle.path()).' && git pull && git submodule update --init --recursive'
+    let cmd  = g:shellesc_cd('cd '.bundle_path)
+    let cmd .= ' && git pull'
+    let cmd .= ' && git submodule update --init --recursive'
 
-    let cmd = g:shellesc_cd(cmd)
-
-    let get_current_sha = 'cd '.shellescape(a:bundle.path()).' && git rev-parse HEAD'
-    let get_current_sha = g:shellesc_cd(get_current_sha)
+    let get_current_sha  = g:shellesc_cd('cd '.bundle_path)
+    let get_current_sha .= ' && git rev-parse HEAD'
     let initial_sha = system(get_current_sha)[0:15]
   else
-    let cmd = 'git clone --recursive '.shellescape(a:bundle.uri).' '.shellescape(a:bundle.path())
+    let cmd = 'git clone --recursive '.shellescape(a:bundle.uri).' '.bundle_path
     let initial_sha = ''
   endif