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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/unnecessary_alias_expansion.ex
defmodule Credo.Check.Readability.UnnecessaryAliasExpansion do
use Credo.Check,
id: "EX3030",
base_priority: :low,
explanations: [
check: """
Alias expansion is useful but when aliasing a single module,
it can be harder to read with unnecessary braces.
# preferred
alias ModuleA.Foo
alias ModuleA.{Foo, Bar}
# NOT preferred
alias ModuleA.{Foo}
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
ctx = Context.build(source_file, params, __MODULE__)
result = Credo.Code.prewalk(source_file, &walk/2, ctx)
result.issues
end
defp walk({:alias, _, [{{:., _, [_, :{}]}, _, [{:__aliases__, meta, [child]}]}]} = ast, ctx) do
{ast, put_issue(ctx, issue_for(ctx, meta, child))}
end
defp walk(ast, ctx) do
{ast, ctx}
end
defp issue_for(ctx, meta, trigger) do
format_issue(
ctx,
message: "Unnecessary alias expansion for #{trigger}, consider removing braces.",
trigger: trigger,
line_no: meta[:line]
)
end
end