refactor 3 more functions out of the monolithic autoload file

autoload/nerdtree.vim

@@ -95,25 +95,6 @@ function! nerdtree#runningWindows()
     return has("win16") || has("win32") || has("win64")
 endfunction
 
-"FUNCTION: nerdtree#treeMarkupReg(dir) {{{2
-function! nerdtree#treeMarkupReg()
-    if g:NERDTreeDirArrows
-        return '^\([▾▸] \| \+[▾▸] \| \+\)'
-    endif
-
-    return '^[ `|]*[\-+~]'
-endfunction
-
-"FUNCTION: nerdtree#treeUpDirLine(dir) {{{2
-function! nerdtree#treeUpDirLine()
-    return '.. (up a dir)'
-endfunction
-
-"FUNCTION: nerdtree#treeWid(dir) {{{2
-function! nerdtree#treeWid()
-    return 2
-endfunction
-
 " SECTION: View Functions {{{1
 "============================================================
 
@@ -374,7 +355,7 @@ endfunction
 function! nerdtree#stripMarkupFromLine(line, removeLeadingSpaces)
     let line = a:line
     "remove the tree parts and the leading space
-    let line = substitute (line, nerdtree#treeMarkupReg(),"","")
+    let line = substitute (line, g:NERDTreeUI.MarkupReg(),"","")
 
     "strip off any read only flag
     let line = substitute (line, ' \[RO\]', "","")

autoload/nerdtree/ui_glue.vim

@@ -85,7 +85,7 @@ endfunction
 "FUNCTION: s:activateAll() {{{1
 "handle the user activating the updir line
 function! s:activateAll()
-    if getline(".") ==# nerdtree#treeUpDirLine()
+    if getline(".") ==# g:NERDTreeUI.UpDirLine()
         return nerdtree#ui_glue#upDir(0)
     endif
 endfunction
@@ -312,7 +312,7 @@ function! s:handleLeftClick()
         endfor
 
         if currentNode.path.isDirectory
-            if startToCur =~# nerdtree#treeMarkupReg() && startToCur =~# '[+~▾▸] \?$'
+            if startToCur =~# g:NERDTreeUI.MarkupReg() && startToCur =~# '[+~▾▸] \?$'
                 call currentNode.activate()
                 return
             endif
@@ -320,7 +320,7 @@ function! s:handleLeftClick()
 
         if (g:NERDTreeMouseMode ==# 2 && currentNode.path.isDirectory) || g:NERDTreeMouseMode ==# 3
             let char = strpart(startToCur, strlen(startToCur)-1, 1)
-            if char !~# nerdtree#treeMarkupReg()
+            if char !~# g:NERDTreeUI.MarkupReg()
                 if currentNode.path.isDirectory
                     call currentNode.activate()
                 else