Add documentation

move Global variable to plugin/OmniSharp.vim
Create log directory if it doesn't exist

Author: lrdickson

autoload/OmniSharp.vim

@@ -431,12 +431,7 @@ function! OmniSharp#Install(...) abort
   let l:location = shellescape(OmniSharp#util#ServerDir())
 
   if has('win32')
-    if exists('g:OmniSharp_log_dir')
-      let l:log_dir = g:OmniSharp_log_dir
-    else
-      let l:log_dir = s:plugin_root_dir . '\log'
-    end
-    let l:logfile = l:log_dir . '\install.log'
+    let l:logfile = g:OmniSharp_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'
@@ -445,11 +440,7 @@ function! OmniSharp#Install(...) abort
     \ 'powershell -ExecutionPolicy Bypass -File %s %s -l %s %s',
     \ l:script, l:http, l:location, l:version)
   else
-    if exists('g:OmniSharp_log_dir')
-      let l:log_dir = g:OmniSharp_log_dir
-    else
-      let l:log_dir = s:plugin_root_dir . '/log'
-    end
+    let l:logfile = g:OmniSharp_log_dir . '/install.log'
     let l:logfile = l:log_dir . '/install.log'
     let l:script = shellescape(
     \ s:plugin_root_dir . '/installer/omnisharp-manager.sh')

autoload/OmniSharp/log.vim

@@ -1,11 +1,7 @@
 let s:save_cpo = &cpoptions
 set cpoptions&vim
 
-if exists('g:OmniSharp_log_dir')
-  let s:stdiologfile = g:OmniSharp_log_dir . '/stdio.log'
-else
-  let s:stdiologfile = expand('<sfile>:p:h:h:h') . '/log/stdio.log'
-end
+let s:stdiologfile = g:OmniSharp_log_dir . '/stdio.log'
 
 " Log from OmniSharp-vim
 function! OmniSharp#log#Log(job, message, ...) abort

doc/omnisharp-vim.txt

@@ -106,6 +106,16 @@ to 1, omnisharp-vim will translate the cygwin/WSL unix paths into Windows paths
 and back.
 Default: 0 >
     let g:OmniSharp_translate_cygwin_wsl = 1
+<
+                                                            *g:OmniSharp_log_dir*
+Sets the log directory.
+
+Use this option to specify the directory log files will be written to. If the
+directory specified does not exist, it will be created. When no log directory is
+specified, logs are written to the log directory in the Omnisharp-vim plugin
+directory.
+Default: /omnisharp-vim/log >
+    let g:OmniSharp_log_dir = '/omnisharp-vim/log'
 <
                                                            *g:OmniSharp_loglevel*
 Sets the log level.

plugin/OmniSharp.vim

@@ -30,6 +30,13 @@ let g:OmniSharp_start_without_solution = get(g:, 'OmniSharp_start_without_soluti
 " Automatically start server
 let g:OmniSharp_start_server = get(g:, 'OmniSharp_start_server', get(g:, 'Omnisharp_start_server', 1))
 
+if has('win32')
+  let default_log_dir = expand('<sfile>:p:h:h') . '\log'
+else
+  let default_log_dir = expand('<sfile>:p:h:h') . '/log'
+end
+let g:OmniSharp_log_dir = get(g:, 'OmniSharp_log_dir', default_log_dir)
+
 let defaultlevel = g:OmniSharp_server_stdio ? 'info' : 'warning'
 let g:OmniSharp_loglevel = get(g:, 'OmniSharp_loglevel', defaultlevel)
 
@@ -130,4 +137,9 @@ if g:OmniSharp_selector_ui ==? 'ctrlp'
   endif
 endif
 
+" Make the log directory if it doesn't exist
+if !isdirectory(g:OmniSharp_log_dir)
+  call mkdir(g:OmniSharp_log_dir, "p")
+end
+
 " vim:et:sw=2:sts=2