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A static code analysis tool with a focus on code consistency and teaching.
Current section
Files
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Files
lib/credo/check/readability/multi_alias.ex
defmodule Credo.Check.Readability.MultiAlias do
use Credo.Check,
id: "EX3011",
base_priority: :low,
tags: [:controversial],
explanations: [
check: """
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.
"""
]
@doc false
@impl true
def run(%SourceFile{} = source_file, params) do
issue_meta = IssueMeta.for(source_file, params)
Credo.Code.prewalk(source_file, &traverse(&1, &2, issue_meta))
end
# TODO: consider for experimental check front-loader (ast)
defp traverse(
{:alias, _, [{{_, _, [{alias, opts, _base_alias}, :{}]}, _, [multi_alias | _]}]} = ast,
issues,
issue_meta
)
when alias in [:__aliases__, :__MODULE__] do
{:__aliases__, _, module} = multi_alias
module = Enum.join(module, ".")
new_issue = issue_for(issue_meta, Keyword.get(opts, :line), module)
{ast, [new_issue | issues]}
end
defp traverse(ast, issues, _issue_meta), do: {ast, issues}
defp issue_for(issue_meta, line_no, trigger) do
format_issue(
issue_meta,
message:
"Avoid grouping aliases in '{ ... }'; please specify one fully-qualified alias per line.",
trigger: trigger,
line_no: line_no
)
end
end