defmodule Credo.Check.Warning.UnusedRegexOperation do
use Credo.Check,
id: "EX5022",
base_priority: :high,
explanations: [
check: """
The result of a call to the Regex module's functions has to be used.
While this is correct ...
def extract_username_and_salute(regex, string) do
[string] = Regex.run(regex, string)
"Hi #\{string}"
end
... we forgot to save the downcased username in this example:
def extract_username_and_salute(regex, string) do
Regex.run(regex, string)
"Hi #\{string}"
end
Regex operations never work on the variable you pass in, but return a new
variable which has to be used somehow.
"""
]
alias Credo.Check.Warning.UnusedOperation
@checked_module :Regex
@funs_with_return_value nil
@doc false
@impl true
def run(%SourceFile{} = source_file, params) do
UnusedOperation.run(
source_file,
params,
@checked_module,
@funs_with_return_value,
&format_issue/2
)
end
end