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credo
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A static code analysis tool with a focus on code consistency and teaching.
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Files
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Files
lib/credo/check/readability/multi_alias.ex
defmodule Credo.Check.Readability.MultiAlias do
@moduledoc false
@checkdoc """
Multi alias expansion makes module uses harder to search for in large code bases.
# preferred
alias Module.Foo
alias Module.Bar
# NOT preferred
alias Module.{Foo, Bar}
Like all `Readability` issues, this one is not a technical concern.
But you can improve the odds of others reading and liking your code by making
it easier to follow.
"""
@explanation [check: @checkdoc]
use Credo.Check, base_priority: :low
alias Credo.Code
@doc false
def run(source_file, params \\ []) do
issue_meta = IssueMeta.for(source_file, params)
Code.prewalk(source_file, &traverse(&1, &2, issue_meta))
end
defp traverse(
{:alias, _, [{{_, _, [{:__aliases__, opts, base_alias}, :{}]}, _, [multi_alias | _]}]} =
ast,
issues,
issue_meta
) do
{:__aliases__, _, module} = multi_alias
module = Enum.join(module, ".")
new_issue = issue_for(issue_meta, Keyword.get(opts, :line), base_alias, module)
{ast, [new_issue | issues]}
end
defp traverse(ast, issues, _issue_meta), do: {ast, issues}
defp issue_for(issue_meta, line_no, base_alias, trigger) do
module =
base_alias
|> Module.concat()
|> Module.concat(trigger)
|> inspect()
format_issue(
issue_meta,
message: "Avoid multi aliases to #{module}; consider removing.",
trigger: trigger,
line_no: line_no
)
end
end