Add a splash popup while starting up

Sometimes it can take quite a while to start up and initialise the debug
adapter. So we use popup/float to display the status as we start up and
shut down.

This increases minimum Vim version to 8.2, but that's been out for ages
now and I intend to agressively require latest/later vim/neovim
versions.

README.md

@@ -150,7 +150,7 @@ Alternatively, you can clone the repo and select which gadgets are installed:
 
 Vimspector requires:
 
-* Vim version 8.1 with at least patch 1264, or Neovim 0.4.3
+* At least Vim version 8.2, or Neovim 0.4.3 (experimental)
 * One of the following operating systems:
   * Linux
   * macOS Mojave or later
@@ -162,6 +162,12 @@ Why such a new vim ? Well 2 reasons:
 2. Because there are Vim bugs that vimspector triggers that will frustrate you
    if you hit them.
 
+Why is neovim experimental? Because the author doesn't use neovim regularly, and
+there are no regression tests for vimspector in neovim, so it's likely to break
+frequently.  Issue reports are handled on best-efforts basis, and PRs are
+welcome to fix bugs. See also the next section descibing differences for neovim
+vs vim.
+
 Why Windows support experimental? Because it's effort and it's not a priority
 for the author. PRs are welcome to fix bugs. Windows will not be regularly
 tested.

autoload/vimspector/internal/neopopup.vim

@@ -0,0 +1,70 @@
+" vimspector - A multi-language debugging system for Vim
+" Copyright 2018 Ben Jackson
+"
+" Licensed under the Apache License, Version 2.0 (the "License");
+" you may not use this file except in compliance with the License.
+" You may obtain a copy of the License at
+"
+"   http://www.apache.org/licenses/LICENSE-2.0
+"
+" Unless required by applicable law or agreed to in writing, software
+" distributed under the License is distributed on an "AS IS" BASIS,
+" WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+" See the License for the specific language governing permissions and
+" limitations under the License.
+
+" Boilerplate {{{
+let s:save_cpo = &cpoptions
+set cpoptions&vim
+" }}}
+
+" Neovim's float window API, like its job/channel API is painful to use
+" compared to Vim's so we have to employ more hacks
+
+" We can't seem to pass a Window handle back to the python, so we have to
+" maintain yet another cached here
+let s:db = {}
+let s:next_id = 0
+
+function! vimspector#internal#neopopup#DisplaySplash( message ) abort
+  let buf = nvim_create_buf(v:false, v:true)
+  call nvim_buf_set_lines(buf, 0, -1, v:true, [ a:message ] )
+
+  let l = len( a:message )
+
+  let opts = {
+        \ 'relative':   'editor',
+        \ 'width':      l,
+        \ 'height':     1,
+        \ 'col':        ( &columns / 2 ) - ( l / 2 ),
+        \ 'row':        &lines / 2,
+        \ 'anchor':     'NW',
+        \ 'style':      'minimal',
+        \ 'focusable':  v:false,
+        \ }
+  let win = nvim_open_win(buf, 0, opts)
+  call nvim_win_set_option(win, 'wrap', v:false)
+
+  let id = s:next_id
+  let s:next_id += 1
+  let s:db[ id ] = { 'win': win, 'buf': buf }
+  return id
+endfunction
+
+function! vimspector#internal#neopopup#UpdateSplash( id, message ) abort
+  let splash = s:db[ a:id ]
+  call nvim_buf_set_lines(splash.buf, 0, -1, v:true, [ a:message ] )
+  return a:id
+endfunction
+
+function! vimspector#internal#neopopup#HideSplash( id ) abort
+  let splash = s:db[ a:id ]
+  call nvim_win_close( splash.win, v:true )
+  unlet s:db[ a:id ]
+endfunction
+
+" Boilerplate {{{
+let &cpoptions=s:save_cpo
+unlet s:save_cpo
+" }}}
+

autoload/vimspector/internal/popup.vim

@@ -0,0 +1,38 @@
+" vimspector - A multi-language debugging system for Vim
+" Copyright 2018 Ben Jackson
+"
+" Licensed under the Apache License, Version 2.0 (the "License");
+" you may not use this file except in compliance with the License.
+" You may obtain a copy of the License at
+"
+"   http://www.apache.org/licenses/LICENSE-2.0
+"
+" Unless required by applicable law or agreed to in writing, software
+" distributed under the License is distributed on an "AS IS" BASIS,
+" WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+" See the License for the specific language governing permissions and
+" limitations under the License.
+
+
+" Boilerplate {{{
+let s:save_cpo = &cpoptions
+set cpoptions&vim
+" }}}
+
+function! vimspector#internal#popup#DisplaySplash( message ) abort
+  return popup_dialog( a:message, {} )
+endfunction
+
+function! vimspector#internal#popup#UpdateSplash( id, message ) abort
+  call popup_settext( a:id, a:message )
+  return a:id
+endfunction
+
+function! vimspector#internal#popup#HideSplash( id ) abort
+  call popup_hide( a:id )
+endfunction
+
+" Boilerplate {{{
+let &cpoptions=s:save_cpo
+unlet s:save_cpo
+" }}}

python3/vimspector/debug_session.py

@@ -19,7 +19,6 @@ import logging
 import os
 import shlex
 import subprocess
-import traceback
 import functools
 import vim
 
@@ -60,6 +59,7 @@ class DebugSession( object ):
     self._variablesView = None
     self._outputView = None
     self._breakpoints = breakpoints.ProjectBreakpoints()
+    self._splash_screen = None
 
     self._run_on_server_exit = None
 
@@ -326,9 +326,12 @@ class DebugSession( object ):
   def _Reset( self ):
     self._logger.info( "Debugging complete." )
     if self._uiTab:
-      self._logger.debug( "Clearing down UI with stack_trace: %s",
+      self._logger.debug( "Clearing down UI" )
-                          traceback.format_stack() )
       vim.current.tabpage = self._uiTab
+
+      self._splash_screen = utils.HideSplash( self._api_prefix,
+                                              self._splash_screen )
+
       self._stackTraceView.Reset()
       self._variablesView.Reset()
       self._outputView.Reset()
@@ -436,6 +439,7 @@ class DebugSession( object ):
   def GetOutputBuffers( self ):
     return self._outputView.GetCategories()
 
+  @IfConnected
   def GetCompletionsSync( self, text_line, column_in_bytes ):
     if not self._server_capabilities.get( 'supportsCompletionsRequest' ):
       return []
@@ -523,6 +527,11 @@ class DebugSession( object ):
     return True
 
   def _StartDebugAdapter( self ):
+    self._splash_screen = utils.DisplaySplash(
+      self._api_prefix,
+      self._splash_screen,
+      "Starting debug adapter..." )
+
     if self._connection:
       utils.UserMessage( 'The connection is already created. Please try again',
                          persist = True )
@@ -560,6 +569,9 @@ class DebugSession( object ):
                      "  g:_vimspector_adapter_spec "
                      ")".format( self._connection_type ) ):
       self._logger.error( "Unable to start debug server" )
+      self._splash_screen = utils.DisplaySplash( self._api_prefix,
+                                                 self._splash_screen,
+                                                 "Unable to start adapter" )
     else:
       self._connection = debug_adapter_connection.DebugAdapterConnection(
         self,
@@ -570,6 +582,11 @@ class DebugSession( object ):
     self._logger.info( 'Debug Adapter Started' )
 
   def _StopDebugAdapter( self, callback = None ):
+    self._splash_screen = utils.DisplaySplash(
+      self._api_prefix,
+      self._splash_screen,
+      "Shutting down debug adapter..." )
+
     def handler( *args ):
       if callback:
         self._logger.debug( "Setting server exit handler before disconnect" )
@@ -706,6 +723,11 @@ class DebugSession( object ):
     return [ command ]
 
   def _Initialise( self ):
+    self._splash_screen = utils.DisplaySplash(
+      self._api_prefix,
+      self._splash_screen,
+      "Initializing debug adapter..." )
+
     # For a good explaination as to why this sequence is the way it is, see
     # https://github.com/microsoft/vscode/issues/4902#issuecomment-368583522
     #
@@ -760,8 +782,18 @@ class DebugSession( object ):
       launch_config.get( 'request', 'launch' ) )
 
     if request == "attach":
+      self._splash_screen = utils.DisplaySplash(
+        self._api_prefix,
+        self._splash_screen,
+        "Attaching to debugee..." )
+
       self._PrepareAttach( adapter_config, launch_config )
     elif request == "launch":
+      self._splash_screen = utils.DisplaySplash(
+        self._api_prefix,
+        self._splash_screen,
+        "Launching debugee..." )
+
       # FIXME: This cmdLine hack is not fun.
       self._PrepareLaunch( self._configuration.get( 'remote-cmdLine', [] ),
                            adapter_config,
@@ -807,6 +839,9 @@ class DebugSession( object ):
     # leader rather than the process. The workaround is to manually SIGTRAP the
     # PID.
     #
+    self._splash_screen = utils.HideSplash( self._api_prefix,
+                                            self._splash_screen )
+
     if self._launch_complete and self._init_complete:
       for h in self._on_init_complete_handlers:
         h()

python3/vimspector/utils.py

@@ -546,3 +546,20 @@ def SetSyntax( current_syntax, syntax, *args ):
 def GetBufferFiletypes( buf ):
   ft = ToUnicode( vim.eval( f"getbufvar( {buf.number}, '&ft' )" ) )
   return ft.split( '.' )
+
+
+def DisplaySplash( api_prefix, splash, text ):
+  if splash:
+    return Call( f'vimspector#internal#{api_prefix}popup#UpdateSplash',
+                 splash,
+                 text )
+  else:
+    return Call( f'vimspector#internal#{api_prefix}popup#DisplaySplash',
+                 text )
+
+
+def HideSplash( api_prefix, splash ):
+  if splash:
+    Call( f'vimspector#internal#{api_prefix}popup#HideSplash', splash )
+
+  return None

tests/ci/image/Dockerfile

@@ -27,7 +27,7 @@ RUN ln -fs /usr/share/zoneinfo/Europe/London /etc/localtime && \
 ## cleanup of files from setup
 RUN rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-ARG VIM_VERSION=v8.1.1270
+ARG VIM_VERSION=v8.2.0460
 
 ENV CONF_ARGS "--with-features=huge \
                --enable-python3interp \

tests/tabpage.test.vim

@@ -10,7 +10,7 @@ function! Test_Step_With_Different_Tabpage()
   lcd testdata/cpp/simple
   edit simple.cpp
 
-  " Add the breakpoing
+  " Add the breakpoint
   " TODO refactor FeedKeys
   15
   call assert_equal( 15, line( '.' ) )
@@ -47,6 +47,7 @@ function! Test_Step_With_Different_Tabpage()
   call vimspector#Reset()
   call vimspector#ClearBreakpoints()
 
+  call WaitForAssert( {-> assert_notequal( vimspector_tabnr, tabpagenr() ) } )
   lcd -
   %bwipeout!
 endfunction