Fix problem when project directory has a trailing slash

data/plugins/treeview.lua

@@ -38,7 +38,7 @@ function TreeView:get_cached(item, dirname)
   local t = dir_cache[item.filename]
   if not t then
     t = {}
-    local basename = item.filename:match("[^\\/]+$")
+    local basename = common.basename(item.filename)
     if item.topdir then
       t.filename = basename
       t.expanded = true
@@ -145,7 +145,6 @@ end
 
 local function create_directory_in(item)
   local path = item.abs_filename
-  local basename = path:match("[^\\/]+$")
   core.command_view:enter("Create directory in " .. path, function(text)
     local dirname = path .. PATHSEP .. text
     local success, err = system.mkdir(dirname)

data/plugins/workspace.lua

@@ -4,7 +4,7 @@ local DocView = require "core.docview"
 
 
 local function workspace_files_for(project_dir)
-  local basename = project_dir:match("[^\\/]+$")
+  local basename = common.basename(project_dir)
   local workspace_dir = USERDIR .. PATHSEP .. "ws"
   local info_wsdir = system.get_file_info(workspace_dir)
   if not info_wsdir then
@@ -49,7 +49,7 @@ local function get_workspace_filename(project_dir)
   while id_list[id] do
     id = id + 1
   end
-  local basename = project_dir:match("[^\\/]+$")
+  local basename = common.basename(project_dir)
   return USERDIR .. PATHSEP .. "ws" .. PATHSEP .. basename .. "-" .. tostring(id)
 end