Add options to control window sizes

This adds the following options, allowing the default sizes to be
overridden:

- g:vimspector_sidebar_width: Controls the width of the left utility
  windows (variables, watches, stack trace)
- g:vimspector_bottombar_height: Controls the height of the output
  window below the code window

The terminal is typically created as a vertical split of the code
window.  The following control the sizing of the terminal window used
for debuggee input/output when using Vim's built-in terminal.

- g:vimspector_code_minwidth: Minimum number of columns to try and
  maintain for the code window.
- g:vimspector_terminal_maxwidth: Maximum number of columns to use for
  th terminal, when vertically splitting the code window.
- g:vimspector_terminal_minwidth: Minimum number of columns to use when
  it is not possible to fit g:vimspector_terminal_maxwidth columns next
  to the code window with g:vimspector_code_minwidth columns.

python3/vimspector/code.py

@@ -18,7 +18,7 @@ import logging
 import json
 from collections import defaultdict
 
-from vimspector import utils
+from vimspector import utils, settings
 
 
 class CodeView( object ):
@@ -218,7 +218,7 @@ class CodeView( object ):
     args = params[ 'args' ]
     env = params.get( 'env', {} )
 
-    options = {
+    term_options = {
       'vertical': 1,
       'norestore': 1,
       'cwd': cwd,
@@ -238,9 +238,9 @@ class CodeView( object ):
            and int( utils.Call( 'vimspector#internal#{}term#IsFinished'.format(
                                   self._api_prefix ),
                                 self._terminal_buffer_number ) ) ):
-        options[ 'curwin' ] = 1
+        term_options[ 'curwin' ] = 1
       else:
-        options[ 'vertical' ] = 0
+        term_options[ 'vertical' ] = 0
 
     buffer_number = None
     terminal_window = None
@@ -248,17 +248,19 @@ class CodeView( object ):
       # If we're making a vertical split from the code window, make it no more
       # than 80 columns and no fewer than 10. Also try and keep the code window
       # at least 82 columns
-      if options[ 'vertical' ] and not options.get( 'curwin', 0 ):
-        options[ 'term_cols' ] = max(
-          min ( int( vim.eval( 'winwidth( 0 ) - 82' ) ), 80 ),
-          10
+      if term_options[ 'vertical' ] and not term_options.get( 'curwin', 0 ):
+        term_options[ 'term_cols' ] = max(
+          min ( int( vim.eval( 'winwidth( 0 )' ) )
+                     - settings.Int( 'code_minwidth', 82 ),
+                settings.Int( 'terminal_maxwidth', 80 ) ),
+          settings.Int( 'terminal_minwidth' , 10 )
         )
 
       buffer_number = int(
         utils.Call(
           'vimspector#internal#{}term#Start'.format( self._api_prefix ),
           args,
-          options ) )
+          term_options ) )
       terminal_window = vim.current.window
 
     if buffer_number is None or buffer_number <= 0:

python3/vimspector/debug_session.py

@@ -29,7 +29,8 @@ from vimspector import ( breakpoints,
                          output,
                          stack_trace,
                          utils,
-                         variables )
+                         variables,
+                         settings )
 from vimspector.vendor.json_minify import minify
 
 # We cache this once, and don't allow it to change (FIXME?)
@@ -487,7 +488,8 @@ class DebugSession( object ):
     self._codeView = code.CodeView( code_window, self._api_prefix )
 
     # Call stack
-    vim.command( 'topleft vertical 50new' )
+    vim.command(
+      f'topleft vertical { settings.Int( "sidebar_width", 50 ) }new' )
     stack_trace_window = vim.current.window
     one_third = int( vim.eval( 'winheight( 0 )' ) ) / 3
     self._stackTraceView = stack_trace.StackTraceView( self,
@@ -515,7 +517,7 @@ class DebugSession( object ):
 
     # Output/logging
     vim.current.window = code_window
-    vim.command( 'rightbelow 10new' )
+    vim.command( f'rightbelow { settings.Int( "bottombar_height", 10 ) }new' )
     output_window = vim.current.window
     self._outputView = output.OutputView( self._connection,
                                           output_window,

python3/vimspector/settings.py

@@ -0,0 +1,26 @@
+# vimspector - A multi-language debugging system for Vim
+# Copyright 2020 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.
+
+
+import vim
+import builtins
+
+
+def Get( option: str, default=None, cls=str ):
+  return cls( vim.vars.get( f'vimspector_{ option }', default ) )
+
+
+def Int( option: str, default=0 ):
+  return Get( option, default=default, cls=builtins.int )