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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/readability/trailing_blank_line.ex
defmodule Credo.Check.Readability.TrailingBlankLine do
@moduledoc false
@checkdoc """
Files should end in a trailing blank line.
This is mostly for historical reasons: every text file should end with a \\n,
or newline since this acts as `eol` or the end of the line character.
See also: http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
Most text editors ensure this "final newline" automatically.
"""
@explanation [check: @checkdoc]
use Credo.Check, base_priority: :low
@doc false
def run(source_file, params \\ []) do
issue_meta = IssueMeta.for(source_file, params)
{line_no, last_line} =
source_file
|> SourceFile.lines()
|> List.last()
if String.trim(last_line) == "" do
[]
else
[issue_for(issue_meta, line_no)]
end
end
defp issue_for(issue_meta, line_no) do
format_issue(
issue_meta,
message: "There should be a final \\n at the end of each file.",
line_no: line_no
)
end
end