#150 couldn't make stderr distinct from stdout (#107)

* use lua native calls to create empty file (replace os.exec(touch)

* deal with win paths better

* fix style

* fix quote style

---------

Co-authored-by: Tom Collings <tom.collings@gmail.com>
Co-authored-by: amleto <amleto@not.real.com>

lua/cmake-tools/session.lua

@@ -24,6 +24,8 @@ end
 local function get_current_path()
   local current_path = vim.loop.cwd()
   local clean_path = current_path:gsub("/", "")
+  clean_path = clean_path:gsub("\\", "")
+  clean_path = clean_path:gsub(":", "")
   return get_cache_path() .. clean_path .. ".lua"
 end
 
@@ -39,7 +41,10 @@ local function init_session()
 
   local path = get_current_path()
   if not utils.file_exists(path) then
-    os.execute("touch " .. path)
+    local file = io.open(path, "w")
+    if file then
+      file:close()
+    end
   end
 end