This would greatly reduce people using additional coverage reporters like
excoveralls or similar as some tools (at least GitLab CI that I am using)
allows to parse test output to fetch general coverage from there.
My proposal is to generate per module and total percentage from default
coverage reporter. Example Coverage module that provides such result
(additional there is additional option :threshold which colours resulting
coverage red/green).
defmodule Cover do
@moduledoc false
@threshold 90
def start(compile_path, opts) do
Mix.shell().info("Cover compiling modules ...")
_ = :cover.start()
case :cover.compile_beam_directory(compile_path |> to_charlist) do
results when is_list(results) ->
:ok
{:error, _} ->
Mix.raise("Failed to cover compile directory: " <> compile_path)
end
output = opts[:output]
fn ->
File.mkdir_p!(output)
Mix.shell().info("\nCover results")
{:result, ok, _fail} = :cover.analyse(:coverage, :module)
Mix.shell().info("Percentage | Module")
Mix.shell().info("-----------|--------------------------")
total =
ok
|> Stream.each(&display(&1, opts))
|> Stream.each(&html(&1, output))
|> Enum.reduce({0, 0}, fn {_, {cov, not_cov}}, {tot_cov,
tot_not_cov} ->
{tot_cov + cov, tot_not_cov + not_cov}
end)
Mix.shell().info("-----------|--------------------------")
display({"Total", total}, opts)
end
end
defp colour(percentage, threshold) when percentage > threshold, do: :green
defp colour(_, _), do: :red
defp display({name, coverage}, opts) do
threshold = Keyword.get(opts, :threshold, @threshold)
percentage = percentage(coverage)
Mix.shell().info([
colour(percentage, threshold),
format(percentage, 9),
"%",
:reset,
" | #{name}"
])
end
defp html({mod, _}, output) do
{:ok, _} = :cover.analyse_to_file(mod, '#{output}/#{mod}.html', [:html])
end
defp percentage({0, 0}), do: 100
defp percentage({cov, not_cov}), do: cov / (cov + not_cov) * 100
defp format(num, len) when is_integer(num) do
num
|> Integer.to_string()
|> String.pad_leading(len)
end
defp format(num, len) when is_float(num) do
num
|> Float.round(2)
|> Float.to_string()
|> String.pad_leading(len)
end
end
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