open install.log in the log directory

Author: lrdickson

autoload/OmniSharp.vim

@@ -431,7 +431,12 @@ function! OmniSharp#Install(...) abort
   let l:location = shellescape(OmniSharp#util#ServerDir())
 
   if has('win32')
-    let l:logfile = s:plugin_root_dir . '\log\install.log'
+    if exists('g:OmniSharp_vim_log_dir')
+      let l:log_dir = g:OmniSharp_vim_log_dir
+    else
+      let l:log_dir = s:plugin_root_dir . '\log'
+    end
+    let l:logfile = l:log_dir . '\install.log'
     let l:script = shellescape(
     \ s:plugin_root_dir . '\installer\omnisharp-manager.ps1')
     let l:version_file_location = l:location . '\OmniSharpInstall-version.txt'
@@ -440,7 +445,12 @@ function! OmniSharp#Install(...) abort
     \ 'powershell -ExecutionPolicy Bypass -File %s %s -l %s %s',
     \ l:script, l:http, l:location, l:version)
   else
-    let l:logfile = s:plugin_root_dir . '/log/install.log'
+    if exists('g:OmniSharp_vim_log_dir')
+      let l:log_dir = g:OmniSharp_vim_log_dir
+    else
+      let l:log_dir = s:plugin_root_dir . '/log'
+    end
+    let l:logfile = l:log_dir . '/install.log'
     let l:script = shellescape(
     \ s:plugin_root_dir . '/installer/omnisharp-manager.sh')
     let l:mono = g:OmniSharp_server_use_mono ? '-M' : ''