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A static code analysis tool with a focus on code consistency and teaching.
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lib/credo/check/refactor/unless_with_else.ex
defmodule Credo.Check.Refactor.UnlessWithElse do
@moduledoc """
An `unless` block should not contain an else block.
So while this is fine:
unless allowed? do
raise "Not allowed!"
end
This should be refactored:
unless allowed? do
raise "Not allowed!"
else
proceed_as_planned
end
to look like this:
if allowed? do
proceed_as_planned
else
raise "Not allowed!"
end
The reason for this is not a technical but a human one. The `else` in this
case will be executed when the condition is met, which is the opposite of
what the wording seems to apply.
"""
@explanation [check: @moduledoc]
use Credo.Check, base_priority: :high
def run(source_file, params \\ []) do
issue_meta = IssueMeta.for(source_file, params)
Credo.Code.prewalk(source_file, &traverse(&1, &2, issue_meta))
end
defp traverse({:unless, meta, _arguments} = ast, issues, issue_meta) do
new_issue =
issue_for_else_block(CodeHelper.else_block_for!(ast), meta, issue_meta)
{ast, issues ++ List.wrap(new_issue)}
end
defp traverse(ast, issues, _issue_meta) do
{ast, issues}
end
defp issue_for_else_block(nil, _meta, _issue_meta) do
nil
end
defp issue_for_else_block(_else_block, meta, issue_meta) do
issue_for(issue_meta, meta[:line], "unless")
end
defp issue_for(issue_meta, line_no, trigger) do
format_issue issue_meta,
message: "Unless conditions should not have an `else` block.",
trigger: trigger,
line_no: line_no
end
end