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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/one_arity_function_in_pipe.ex
defmodule Credo.Check.Readability.OneArityFunctionInPipe do
use Credo.Check,
id: "EX3034",
base_priority: :low,
explanations: [
check: """
Use parentheses for one-arity functions when using the pipe operator (|>).
# not preferred
some_string |> String.downcase |> String.trim
# preferred
some_string |> String.downcase() |> String.trim()
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({:|>, _, [_, {name, meta, nil}]} = ast, ctx) when is_atom(name) do
{ast, put_issue(ctx, issue_for(ctx, meta, name))}
end
defp walk(ast, ctx) do
{ast, ctx}
end
defp issue_for(ctx, meta, name) do
format_issue(
ctx,
message: "One arity functions should have parentheses in pipes.",
trigger: name,
line_no: meta[:line]
)
end
end