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src/Util/Eff.md

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+# Effects utilities
+
+Contains utility functions extending the functionality of the `eff` package.
+
+```idris
+module Util.Eff
+
+import Control.Eff
+import Text.ANSI
+
+%default total
+```
+
+## Logging
+
+Use the `WriterL "log" String` effect like a logging library. We'll provide a few "log levels" as verbs for the effect, but no filtering is done, when logging is enabled, all logs are always displayed, however the log level is indicated with a colored tag. 
+
+<!-- idris
+namespace Logging
+-->
+```idris
+  export
+  info : Has (WriterL "log" String) fs => String -> Eff fs ()
+  info str =
+    let tag = show . bolden . show . colored Green $ "[INFO]"
+    in tellAt "log" (tag ++ ": " ++ str ++ "\n")
+
+  export
+  debug : Has (WriterL "log" String) fs => String -> Eff fs ()
+  debug str =
+    let tag = show . bolden . show . colored BrightWhite $ "[DEBUG]"
+    in tellAt "log" (tag ++ ": " ++ str ++ "\n")
+
+  export
+  warn : Has (WriterL "log" String) fs => String -> Eff fs ()
+  warn str =
+    let tag = show . bolden . show . colored Yellow $ "[WARN]"
+    in tellAt "log" (tag ++ ": " ++ str ++ "\n")
+```