Logging/inspecting data, and timing functions, with code location information.

Logging/inspecting

Untangle provides alternatives for IO.inspect and the macros in Elixir's Logger to output code location information. It also provides a polyfill for dbg which was introduce in Elixir 1.14

The first argument is inspected and the second argument (if provided) is used as a label:

> import Untangle
Untangle
> debug(:no, "the answer is") # log at debug
11:19:09.915 [debug] [iex:2] the answer is: :no
:no
> dump(%{a: :map}, "it") # inspect something on stdout
[iex:3] it: %{a: :map}
%{a: :map}

When used in a code file, the location information becomes more useful, e.g.:

[lib/test_untangle.ex:15@Test.Untangle.example/2] Here's an empty list: []

You may also notice from the iex output that it returns its first argument. This makes it ideal for inserting into a pipeline for debugging purposes:

do_something()
|> debug("output of do_something/0")

When you are done debugging something, the location of the debug statement is already in the output so you know where to remove it, comment it out, or simply change warn or info for debug if you only need it during development :-)

Timing functions

You can decorate functions to measure and log their execution time:

use Untangle

@decorate time()
def fun(), do: :stuff

will output something like [info] Time to run MyModule.fun/0: 1 ms

Installation

If available in Hex, the package can be installed by adding untangle to your list of dependencies in mix.exs:

def deps do
  [
    {:untangle, "~> 0.3"}
  ]
end

Configure as default dbg/2 handler

In config/config.exs

config :elixir, :dbg_callback, {Untangle, :custom_dbg, []}

Docs

The docs can be found at https://hexdocs.pm/untangle.

Copyright and License

Copyright (c) 2022 Bonfire contributors

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.