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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 false
@checkdoc """
There should be no white-space (i.e. tabs, spaces) at the end of a line.
Most text editors provide a way to remove them automatically.
"""
@explanation [
check: @checkdoc,
params: [
ignore_strings: "Set to `false` to check lines that are strings or in heredocs"
]
]
@default_params [
ignore_strings: true
]
use Credo.Check, base_priority: :low
alias Credo.Code
alias Credo.Code.Strings
alias Credo.Code.Heredocs
@doc false
def run(source_file, params \\ []) do
issue_meta = IssueMeta.for(source_file, params)
ignore_strings = Params.get(params, :ignore_strings, @default_params)
source_file
|> to_lines(ignore_strings)
|> traverse_line([], issue_meta)
end
defp to_lines(source_file, true) do
source_file
|> Strings.replace_with_spaces(".")
|> Heredocs.replace_with_spaces(".", ".", ".", source_file.filename)
|> Code.to_lines()
end
defp to_lines(source_file, false) do
SourceFile.lines(source_file)
end
defp traverse_line([{line_no, line} | tail], issues, issue_meta) do
issues =
case Regex.run(~r/\h+$/, 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
defp 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