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lib/dogma/rule/hard_tabs.ex
use Dogma.RuleBuilder
defrule Dogma.Rule.HardTabs do
@moduledoc ~S"""
Requires that all indentation is done using spaces rather than hard tabs.
So the following would be invalid:
def something do
\t:body # this line starts with a tab, not spaces
end
"""
@indenting_tab_pattern ~r/^[\t\s]*\t+/
def test(_rule, script) do
script.lines
|> Enum.filter(&tabs_at_start?/1)
|> Enum.map(&error/1)
end
defp tabs_at_start?({_, line}) do
@indenting_tab_pattern |> Regex.match?(line)
end
defp error({pos, _}) do
%Error{
rule: __MODULE__,
message: "Hard tab indention. Use spaces instead.",
line: Dogma.Script.line(pos),
}
end
end