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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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Files
lib/credo/check/consistency/unused_variable_names.ex
defmodule Credo.Check.Consistency.UnusedVariableNames do
use Credo.Check,
run_on_all: true,
base_priority: :high,
explanations: [
check: """
Elixir allows us to use `_` as a name for variables that are not meant to be
used. But it’s a common practice to give these variables meaningful names
anyway (`_user` instead of `_`), but some people prefer to name them all `_`.
A single style should be present in the same codebase.
"""
]
@collector Credo.Check.Consistency.UnusedVariableNames.Collector
@doc false
def run(source_files, exec, params \\ []) when is_list(source_files) do
@collector.find_and_append_issues(source_files, exec, params, &issues_for/3)
end
defp issues_for(expected, source_file, params) do
issue_meta = IssueMeta.for(source_file, params)
issue_locations = @collector.find_locations_not_matching(expected, source_file)
Enum.map(issue_locations, fn location ->
format_issue(issue_meta, [
{:message, message_for(expected, location[:trigger])} | location
])
end)
end
defp message_for(:meaningful, trigger) do
message = """
Unused variables should be named consistently.
It seems your strategy is to give them meaningful names (eg. `_foo`)
but `#{trigger}` does not follow that convention."
"""
to_one_line(message)
end
defp message_for(:anonymous, trigger) do
message = """
Unused variables should be named consistently.
It seems your strategy is to name them anonymously (ie. `_`)
but `#{trigger}` does not follow that convention.
"""
to_one_line(message)
end
defp to_one_line(str) do
str
|> String.split()
|> Enum.join(" ")
end
end