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A static code analysis tool with a focus on code consistency and teaching.
Current section
Files
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Current section
Files
lib/credo/check/readability/separate_alias_require.ex
defmodule Credo.Check.Readability.SeparateAliasRequire do
use Credo.Check,
id: "EX3021",
base_priority: :low,
explanations: [
check: """
All instances of `alias` should be consecutive within a file.
Likewise, all instances of `require` should be consecutive within a file.
For example:
defmodule Foo do
require Logger
alias Foo.Bar
alias Foo.Baz
require Integer
# ...
end
should be changed to:
defmodule Foo do
require Integer
require Logger
alias Foo.Bar
alias Foo.Baz
# ...
end
Like all `Readability` issues, this one is not a technical concern.
But you can improve the odds of others reading and liking your code by making
it easier to follow.
"""
]
alias Credo.Code.Block
@doc false
@impl true
def run(%SourceFile{} = source_file, params \\ []) do
ctx = Context.build(source_file, params, __MODULE__)
result = Credo.Code.prewalk(source_file, &walk/2, ctx)
result.issues
end
defp walk({:defmodule, _, _} = ast, ctx) do
{_previous_calls, issues} =
ast
|> Block.calls_in_do_block()
|> Enum.reduce({[], []}, fn
{macro_name, meta, args}, {previous_calls, issues}
when is_atom(macro_name) and is_list(args) ->
cond do
List.last(previous_calls) == macro_name ->
{previous_calls, issues}
macro_name in [:alias, :require] and Enum.member?(previous_calls, macro_name) ->
{previous_calls, issues ++ [issue_for(ctx, meta, macro_name)]}
true ->
{previous_calls ++ [macro_name], issues}
end
_, memo ->
memo
end)
{ast, put_issue(ctx, issues)}
end
defp walk(ast, ctx) do
{ast, ctx}
end
defp issue_for(ctx, meta, macro_name) do
format_issue(ctx,
message: message(macro_name),
trigger: macro_name,
line_no: meta[:line]
)
end
def message(:alias), do: "`alias` calls should be consecutive within a module."
def message(:require), do: "`require` calls should be consecutive within a module."
end