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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/prefer_implicit_try.ex
defmodule Credo.Check.Readability.PreferImplicitTry do
@moduledoc """
Prefer using an implicit `try` rather than explicit `try` if you try to rescue
anything the function does.
For example, this:
def failing_function(first) do
try do
to_string(first)
rescue
_ -> :rescued
end
end
Can be rewritten without `try` as below:
def failing_function(first) do
to_string(first)
rescue
_ -> :rescued
end
Like all `Readability` issues, this one is not a technical concern.
The code will behave identical in both ways.
"""
@explanation [check: @moduledoc]
@def_ops [:def, :defp, :defmacro]
use Credo.Check, base_priority: :low
@doc false
def run(source_file, params \\ []) do
issue_meta = IssueMeta.for(source_file, params)
Credo.Code.prewalk(source_file, &traverse(&1, &2, issue_meta))
end
for op <- @def_ops do
defp traverse(
{unquote(op), _, [{_, _, _}, [do: {:try, [line: line_no], _}]]} = ast,
issues,
issue_meta
) do
{ast, issues ++ [issue_for(issue_meta, line_no)]}
end
end
defp traverse(ast, issues, _issue_meta) do
{ast, issues}
end
defp issue_for(issue_meta, line_no) do
format_issue(
issue_meta,
message: "Prefer using an implicit `try` rather than explicit `try`.",
trigger: "try",
line_no: line_no
)
end
end