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A static code analysis tool with a focus on code consistency and teaching.
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Files
lib/credo/check/readability/impl_true.ex
defmodule Credo.Check.Readability.ImplTrue do
use Credo.Check,
base_priority: :normal,
explanations: [
check: """
When implementing behaviour callbacks, `@impl true` indicates that a function implements a callback, but
a better way is to note the actual behaviour being implemented, for example `@impl MyBehaviour`. This
not only improves readability, but adds extra validation in cases where multiple behaviours are implemented
in a single module.
Instead of:
@impl true
def my_funcion() do
...
use:
@impl MyBehaviour
def my_funcion() do
...
"""
]
alias Credo.Code.Heredocs
@doc false
@impl true
def run(%SourceFile{} = source_file, params) do
issue_meta = IssueMeta.for(source_file, params)
source_file
|> Heredocs.replace_with_spaces()
|> String.split("\n")
|> Enum.with_index(1)
|> Enum.reduce([], &check_line(&1, &2, issue_meta))
end
defp check_line({line, line_number}, issues, issue_meta) do
case String.trim(line) do
"@impl true" -> [issue_for(issue_meta, line_number) | issues]
_ -> issues
end
end
defp issue_for(issue_meta, line_no) do
format_issue(
issue_meta,
message: "@impl true should be @impl MyBehaviour",
trigger: "@impl true",
line_no: line_no
)
end
end