Suppress events for intermediate window/tab/buffer changes (#1026)

* Add an optional parameter to neredtree#exec to suppress all events.

The value doesn't matter, but 1 is a good choice. Its presence is an
indicator that tells NERDTree to tell Vim to ignore all events. I'm not
yet sure if there needs to be an else section to that if block. It may
be OK to allow all events to fire in the right situations.

* Supress events in all intermediate nerdtree#exec calls.

Finding all the right function calls is the key here.

* Make ignoreAll a required parameter to nerdtree#exec().

* Put required ignoreAll argument (==0) in where it's now needed.

* Ignore events when creating a new vertical split.

* Ignore events when closing NERDTree. This may need to be reverted.

* Remove debugging statment and commented-out code.

* Wrap remaining buffer/window-switching commands in nerdtree#exec().

* Update version number.

* Add a space between arguments in nerdtree#exec() calls.

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Change Log
 
 #### 5.2...
+- **.9**: Suppress events for intermediate window/tab/buffer changes [#1026](https://github.com/scrooloose/nerdtree/pull/1026)
+- **.8**: Revert [#1019](https://github.com/scrooloose/nerdtree/pull/1019) to fix nvim artifacts and flickering. (PhilRunninger) [#1021](https://github.com/scrooloose/nerdtree/pull/1021)
 - **.7**: Use :mode only in neovim. MacVim still needs to use :redraw! [#1019](https://github.com/scrooloose/nerdtree/pull/1019)
 - **.6**: In CHANGELOG.md and PR template, make reference to PR a true HTML link. [#1017](https://github.com/scrooloose/nerdtree/pull/1017)
 - **.5**: Use `:mode` instead of `:redraw!` when updating menu. (PhilRunninger) [#1016](https://github.com/scrooloose/nerdtree/pull/1016)

autoload/nerdtree.vim

@@ -22,24 +22,8 @@ endfunction
 " SECTION: General Functions {{{1
 "============================================================
 
-"FUNCTION: nerdtree#redraw(bang)
-" Redraws the screen (Neovim uses the mode statement). If bang is TRUE, use
-" redraw! instead of redraw.
-function! nerdtree#redraw(bang)
-    if has('nvim')
-        mode
-    else
-        if a:bang
-            redraw!
-        else
-            redraw
-        endif
-    endif
-endfunction
-
-"FUNCTION: nerdtree#slash()
-" Returns the directory separator based on OS and &shellslash
 function! nerdtree#slash()
+
     if nerdtree#runningWindows()
         if exists('+shellslash') && &shellslash
             return '/'
@@ -170,13 +154,13 @@ function! nerdtree#deprecated(func, ...)
     endif
 endfunction
 
-" FUNCTION: nerdtree#exec(cmd) {{{2
+" FUNCTION: nerdtree#exec(cmd, ignoreAll) {{{2
-" Same as :exec cmd but with eventignore set for the duration
+" Same as :exec cmd but, if ignoreAll is TRUE, set eventignore=all for the duration
-" to disable the autocommands used by NERDTree (BufEnter,
+function! nerdtree#exec(cmd, ignoreAll)
-" BufLeave and VimEnter)
-function! nerdtree#exec(cmd)
     let old_ei = &ei
-    set ei=BufEnter,BufLeave,VimEnter
+    if a:ignoreAll
+        set ei=all
+    endif
     exec a:cmd
     let &ei = old_ei
 endfunction
@@ -232,7 +216,7 @@ endfunction
 "Args:
 "msg: the message to echo
 function! nerdtree#echo(msg)
-    call nerdtree#redraw(0)
+    redraw
     echomsg empty(a:msg) ? "" : ("NERDTree: " . a:msg)
 endfunction
 

autoload/nerdtree/ui_glue.vim

@@ -254,7 +254,7 @@ function! s:deleteBookmark(bookmark)
 
     let l:choices = "&Yes\n&No"
 
-    echo | call nerdtree#redraw(0)
+    echo | redraw
     let l:selection = confirm(l:message, l:choices, 1, 'Warning')
 
     if l:selection != 1
@@ -266,7 +266,7 @@ function! s:deleteBookmark(bookmark)
         call a:bookmark.delete()
         silent call b:NERDTree.root.refresh()
         call b:NERDTree.render()
-        echo | call nerdtree#redraw(0)
+        echo | redraw
     catch /^NERDTree/
         call nerdtree#echoWarning('could not remove bookmark')
     endtry
@@ -574,11 +574,11 @@ function! s:refreshRoot()
     call nerdtree#echo("Refreshing the root node. This could take a while...")
 
     let l:curWin = winnr()
-    call nerdtree#exec(g:NERDTree.GetWinNum() . "wincmd w")
+    call nerdtree#exec(g:NERDTree.GetWinNum() . "wincmd w", 1)
     call b:NERDTree.root.refresh()
     call b:NERDTree.render()
-    call nerdtree#redraw(0)
+    redraw
-    call nerdtree#exec(l:curWin . "wincmd w")
+    call nerdtree#exec(l:curWin . "wincmd w", 1)
     call nerdtree#echo("")
 endfunction
 

lib/nerdtree/bookmark.vim

@@ -159,8 +159,8 @@ endfunction
 " FUNCTION: s:Edit() {{{1
 " opens the NERDTreeBookmarks file for manual editing
 function! s:Bookmark.Edit()
-    execute "wincmd w"
+    call nerdtree#exec("wincmd w", 1)
-    execute "edit ".g:NERDTreeBookmarksFile
+    call nerdtree#exec("edit ".g:NERDTreeBookmarksFile, 1)
 endfunction
 
 " FUNCTION: Bookmark.getNode(nerdtree, searchFromAbsoluteRoot) {{{1

lib/nerdtree/menu_controller.vim

@@ -31,7 +31,11 @@ function! s:MenuController.showMenu()
         let l:done = 0
 
         while !l:done
-            call nerdtree#redraw(1)
+            if has('nvim')
+                mode
+            else
+                redraw!
+            endif
             call self._echoPrompt()
 
             let l:key = nr2char(getchar())
@@ -42,7 +46,7 @@ function! s:MenuController.showMenu()
 
         " Redraw when "Ctrl-C" or "Esc" is received.
         if !l:done || self.selection == -1
-            call nerdtree#redraw(1)
+            redraw!
         endif
     endtry
 
@@ -64,7 +68,7 @@ function! s:MenuController._echoPrompt()
 
         echo "Menu: [" . join(shortcuts, ",") . "] (" . navHelp . " or shortcut): "
     else
-        echo "NERDTree Menu. " . navHelp . " . or the shortcuts indicated"
+        echo "NERDTree Menu. " . navHelp . ", or the shortcuts indicated"
         echo "========================================================="
 
         for i in range(0, len(self.menuItems)-1)

lib/nerdtree/nerdtree.vim

@@ -44,19 +44,19 @@ function! s:NERDTree.Close()
         let l:useWinId = exists('*win_getid') && exists('*win_gotoid')
 
         if winnr() == s:NERDTree.GetWinNum()
-            call nerdtree#exec("wincmd p")
+            call nerdtree#exec("wincmd p", 1)
             let l:activeBufOrWin = l:useWinId ? win_getid() : bufnr("")
-            call nerdtree#exec("wincmd p")
+            call nerdtree#exec("wincmd p", 1)
         else
             let l:activeBufOrWin = l:useWinId ? win_getid() : bufnr("")
         endif
 
-        call nerdtree#exec(s:NERDTree.GetWinNum() . " wincmd w")
+        call nerdtree#exec(s:NERDTree.GetWinNum() . " wincmd w", 1)
-        close
+        call nerdtree#exec("close", 1)
         if l:useWinId
-            call nerdtree#exec("call win_gotoid(" . l:activeBufOrWin . ")")
+            call nerdtree#exec("call win_gotoid(" . l:activeBufOrWin . ")", 0)
         else
-            call nerdtree#exec(bufwinnr(l:activeBufOrWin) . " wincmd w")
+            call nerdtree#exec(bufwinnr(l:activeBufOrWin) . " wincmd w", 0)
         endif
     else
         close
@@ -98,7 +98,7 @@ endfunction
 "Places the cursor in the nerd tree window
 function! s:NERDTree.CursorToTreeWin()
     call g:NERDTree.MustBeOpen()
-    call nerdtree#exec(g:NERDTree.GetWinNum() . "wincmd w")
+    call nerdtree#exec(g:NERDTree.GetWinNum() . "wincmd w", 1)
 endfunction
 
 " Function: s:NERDTree.ExistsForBuffer()   {{{1

lib/nerdtree/opener.vim

@@ -107,10 +107,10 @@ function! s:Opener._isWindowUsable(winnumber)
     endif
 
     let oldwinnr = winnr()
-    call nerdtree#exec(a:winnumber . "wincmd p")
+    call nerdtree#exec(a:winnumber . "wincmd p", 1)
     let specialWindow = getbufvar("%", '&buftype') != '' || getwinvar('%', '&previewwindow')
     let modified = &modified
-    call nerdtree#exec(oldwinnr . "wincmd p")
+    call nerdtree#exec(oldwinnr . "wincmd p", 1)
 
     "if its a special window e.g. quickfix or another explorer plugin then we
     "have to split
@@ -172,7 +172,7 @@ function! s:Opener._newSplit()
     let below=0
 
     " Attempt to go to adjacent window
-    call nerdtree#exec(back)
+    call nerdtree#exec(back, 1)
 
     let onlyOneWin = (winnr("$") ==# 1)
 
@@ -201,9 +201,9 @@ function! s:Opener._newSplit()
     "resize the tree window if no other window was open before
     if onlyOneWin
         let size = exists("b:NERDTreeOldWindowSize") ? b:NERDTreeOldWindowSize : g:NERDTreeWinSize
-        call nerdtree#exec(there)
+        call nerdtree#exec(there, 1)
         exec("silent ". splitMode ." resize ". size)
-        call nerdtree#exec('wincmd p')
+        call nerdtree#exec('wincmd p', 0)
     endif
 
     " Restore splitmode settings
@@ -219,8 +219,8 @@ function! s:Opener._newVSplit()
         let l:winwidth = g:NERDTreeWinSize
     endif
 
-    call nerdtree#exec('wincmd p')
+    call nerdtree#exec('wincmd p', 1)
-    vnew
+    call nerdtree#exec('vnew', 1)
 
     let l:currentWindowNumber = winnr()
 
@@ -228,7 +228,7 @@ function! s:Opener._newVSplit()
     call g:NERDTree.CursorToTreeWin()
     execute 'silent vertical resize ' . l:winwidth
 
-    call nerdtree#exec(l:currentWindowNumber . 'wincmd w')
+    call nerdtree#exec(l:currentWindowNumber . 'wincmd w', 0)
 endfunction
 
 " FUNCTION: Opener.open(target) {{{1
@@ -290,9 +290,9 @@ function! s:Opener._previousWindow()
     else
         try
             if !self._isWindowUsable(winnr("#"))
-                call nerdtree#exec(self._firstUsableWindow() . "wincmd w")
+                call nerdtree#exec(self._firstUsableWindow() . "wincmd w", 1)
             else
-                call nerdtree#exec('wincmd p')
+                call nerdtree#exec('wincmd p', 1)
             endif
         catch /^Vim\%((\a\+)\)\=:E37/
             call g:NERDTree.CursorToTreeWin()
@@ -305,8 +305,8 @@ endfunction
 
 " FUNCTION: Opener._restoreCursorPos() {{{1
 function! s:Opener._restoreCursorPos()
-    call nerdtree#exec(self._tabnr . 'tabnext')
+    call nerdtree#exec(self._tabnr . 'tabnext', 1)
-    call nerdtree#exec(bufwinnr(self._bufnr) . 'wincmd w')
+    call nerdtree#exec(bufwinnr(self._bufnr) . 'wincmd w', 1)
 endfunction
 
 " FUNCTION: Opener._reuseWindow() {{{1
@@ -321,7 +321,7 @@ function! s:Opener._reuseWindow()
     "check the current tab for the window
     let winnr = bufwinnr('^' . self._path.str() . '$')
     if winnr != -1
-        call nerdtree#exec(winnr . "wincmd w")
+        call nerdtree#exec(winnr . "wincmd w", 0)
         call self._checkToCloseTree(0)
         return 1
     endif
@@ -334,9 +334,9 @@ function! s:Opener._reuseWindow()
     let tabnr = self._path.tabnr()
     if tabnr
         call self._checkToCloseTree(1)
-        call nerdtree#exec(tabnr . 'tabnext')
+        call nerdtree#exec(tabnr . 'tabnext', 1)
         let winnr = bufwinnr('^' . self._path.str() . '$')
-        call nerdtree#exec(winnr . "wincmd w")
+        call nerdtree#exec(winnr . "wincmd w", 0)
         return 1
     endif
 

lib/nerdtree/ui.vim

@@ -340,7 +340,7 @@ function! s:UI.restoreScreenState()
     if !has_key(self, '_screenState')
         return
     endif
-    exec("silent vertical resize " . self._screenState['oldWindowSize'])
+    call nerdtree#exec("silent vertical resize " . self._screenState['oldWindowSize'], 1)
 
     let old_scrolloff=&scrolloff
     let &scrolloff=0
@@ -360,7 +360,7 @@ function! s:UI.saveScreenState()
     let self._screenState['oldPos'] = getpos(".")
     let self._screenState['oldTopLine'] = line("w0")
     let self._screenState['oldWindowSize']= winwidth("")
-    call nerdtree#exec(win . "wincmd w")
+    call nerdtree#exec(win . "wincmd w", 1)
 endfunction
 
 " FUNCTION: s:UI.setShowHidden(val) {{{1
@@ -506,10 +506,10 @@ endfunction
 function! s:UI.toggleZoom()
     if exists("b:NERDTreeZoomed") && b:NERDTreeZoomed
         let size = exists("b:NERDTreeOldWindowSize") ? b:NERDTreeOldWindowSize : g:NERDTreeWinSize
-        exec "silent vertical resize ". size
+        call nerdtree#exec("silent vertical resize ". size, 1)
         let b:NERDTreeZoomed = 0
     else
-        exec "vertical resize ". get(g:, 'NERDTreeWinSizeMax', '')
+        call nerdtree#exec("vertical resize ". get(g:, 'NERDTreeWinSizeMax', ''), 1)
         let b:NERDTreeZoomed = 1
     endif
 endfunction

nerdtree_plugin/fs_menu.vim

@@ -78,7 +78,7 @@ function! s:inputPrompt(action)
     endif
 
     if g:NERDTreeMenuController.isMinimal()
-        call nerdtree#redraw(1) " Clear the menu
+        redraw! " Clear the menu
         return minimal . " "
     else
         let divider = "=========================================================="
@@ -114,14 +114,14 @@ function! s:promptToDelBuffer(bufnum, msg)
             let l:listedBufferCount = 0
         endif
         if l:listedBufferCount > 1
-            exec "tabdo windo if winbufnr(0) == " . a:bufnum . " | exec ':bnext! ' | endif"
+            call nerdtree#exec("tabdo windo if winbufnr(0) == " . a:bufnum . " | exec ':bnext! ' | endif", 1)
         else
-            exec "tabdo windo if winbufnr(0) == " . a:bufnum . " | exec ':enew! ' | endif"
+            call nerdtree#exec("tabdo windo if winbufnr(0) == " . a:bufnum . " | exec ':enew! ' | endif", 1)
         endif
-        exec "tabnext " . s:originalTabNumber
+        call nerdtree#exec("tabnext " . s:originalTabNumber, 1)
-        exec s:originalWindowNumber . "wincmd w"
+        call nerdtree#exec(s:originalWindowNumber . "wincmd w", 1)
         " 3. We don't need a previous buffer anymore
-        exec "bwipeout! " . a:bufnum
+        call nerdtree#exec("bwipeout! " . a:bufnum, 0)
     endif
 endfunction
 
@@ -141,17 +141,17 @@ function! s:renameBuffer(bufNum, newNodeName, isDirectory)
         let editStr = g:NERDTreePath.New(a:newNodeName).str({'format': 'Edit'})
     endif
     " 1. ensure that a new buffer is loaded
-    exec "badd " . quotedFileName
+    call nerdtree#exec("badd " . quotedFileName, 1)
     " 2. ensure that all windows which display the just deleted filename
     " display a buffer for a new filename.
     let s:originalTabNumber = tabpagenr()
     let s:originalWindowNumber = winnr()
-    exec "tabdo windo if winbufnr(0) == " . a:bufNum . " | exec ':e! " . editStr . "' | endif"
+    call nerdtree#exec("tabdo windo if winbufnr(0) == " . a:bufNum . " | exec ':e! " . editStr . "' | endif", 1)
-    exec "tabnext " . s:originalTabNumber
+    call nerdtree#exec("tabnext " . s:originalTabNumber, 1)
-    exec s:originalWindowNumber . "wincmd w"
+    call nerdtree#exec(s:originalWindowNumber . "wincmd w", 1)
     " 3. We don't need a previous buffer anymore
     try
-        exec "confirm bwipeout " . a:bufNum
+        call nerdtree#exec("confirm bwipeout " . a:bufNum, 0)
     catch
         " This happens when answering Cancel if confirmation is needed. Do nothing.
     endtry
@@ -185,7 +185,7 @@ function! NERDTreeAddNode()
             call newTreeNode.putCursorHere(1, 0)
         endif
 
-        call nerdtree#redraw(1)
+        redraw!
     catch /^NERDTree/
         call nerdtree#echoWarning("Node Not Created.")
     endtry
@@ -234,7 +234,7 @@ function! NERDTreeMoveNode()
 
         call curNode.putCursorHere(1, 0)
 
-        call nerdtree#redraw(1)
+        redraw!
     catch /^NERDTree/
         call nerdtree#echoWarning("Node Not Renamed.")
     endtry
@@ -272,7 +272,7 @@ function! NERDTreeDeleteNode()
                 call s:promptToDelBuffer(bufnum, prompt)
             endif
 
-            call nerdtree#redraw(1)
+            redraw!
         catch /^NERDTree/
             call nerdtree#echoWarning("Could not remove node")
         endtry
@@ -362,7 +362,7 @@ function! NERDTreeCopyNode()
         call nerdtree#echo("Copy aborted.")
     endif
     let &shellslash = l:shellslash
-    call nerdtree#redraw(1)
+    redraw!
 endfunction
 
 " FUNCTION: NERDTreeCopyPath() {{{1