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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/readability/trailing_white_space.ex
defmodule Credo.Check.Readability.TrailingWhiteSpace do
@moduledoc """
There should be no white-space (i.e. tabs, spaces) at the end of a line.
"""
@explanation [check: @moduledoc]
use Credo.Check, base_priority: :low
def run(%SourceFile{lines: lines} = source_file, params \\ []) do
issue_meta = IssueMeta.for(source_file, params)
traverse_line(lines, [], issue_meta)
end
defp traverse_line([{line_no, line} | tail], issues, issue_meta) do
issues =
case Regex.run(~r/\s+$/, line, return: :index) do
[{column, line_length}] ->
[issue_for(issue_meta, line_no, column + 1, line_length) | issues]
nil -> issues
end
traverse_line(tail, issues, issue_meta)
end
defp traverse_line([], issues, _issue_meta), do: issues
def issue_for(issue_meta, line_no, column, line_length) do
format_issue issue_meta,
message: "There should be no trailing white-space at the end of a line.",
line_no: line_no,
column: column,
trigger: String.duplicate(" ", line_length)
end
end