Fixed treefarm logging bugs

jlib/log.lua

@@ -13,6 +13,7 @@ local Logger = {
     level_colors = {
         colors.red, colors.orange, colors.yellow, colors.blue, colors.white},
     prefixes = {"CRIT", "ERROR", "WARN", "INFO", "DEBUG"},
+    -- Explicit is better than implicit
     filename = nil
 }
 
@@ -37,7 +38,7 @@ function Logger:new(o)
 
     -- Open file handler
     if o.filename then
-        o._file = open(filename, "a")
+        o._file = fs.open(o.filename, "a")
     end
 
     return o
@@ -54,7 +55,7 @@ function Logger:log(level, message)
 
     -- Log to screen
     local cur_color = term.getTextColor()
-    term.setTextColor(self.colors[level + 1])
+    term.setTextColor(self.level_colors[level + 1])
     term.write("[" .. self.prefixes[level + 1] .. "] ")
     term.setTextColor(cur_color)
     print(message)