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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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lib/credo/check/warning/unused_tuple_operation.ex
defmodule Credo.Check.Warning.UnusedTupleOperation do
@moduledoc """
The result of a call to the Tuple module's functions has to be used.
# TODO: write example
Tuple operations never work on the variable you pass in, but return a new
variable which has to be used somehow.
"""
@explanation [check: @moduledoc]
alias Credo.Check.Warning.UnusedFunctionReturnHelper
use Credo.Check, base_priority: :high
@doc false
def run(%SourceFile{} = source_file, params \\ []) do
issue_meta = IssueMeta.for(source_file, params)
all_unused_calls =
UnusedFunctionReturnHelper.find_unused_calls(source_file, params,
[:Tuple], nil)
all_unused_calls
|> Enum.reduce([], fn(invalid_call, issues) ->
{_, meta, _} = invalid_call
trigger =
invalid_call
|> Macro.to_string
|> String.split("(")
|> List.first
issues ++ [issue_for(meta[:line], trigger, issue_meta)]
end)
end
defp issue_for(line_no, trigger, issue_meta) do
format_issue issue_meta,
message: "There should be no unused return values for Tuple functions.",
trigger: trigger,
line_no: line_no
end
end