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# frozen_string_literal: true
module Gitlab
module MarkupHelper
extend self
MARKDOWN_EXTENSIONS = %w[mdown mkd mkdn md markdown].freeze
ASCIIDOC_EXTENSIONS = %w[adoc ad asciidoc].freeze
OTHER_EXTENSIONS = %w[textile rdoc org creole wiki mediawiki rst].freeze
EXTENSIONS = MARKDOWN_EXTENSIONS + ASCIIDOC_EXTENSIONS + OTHER_EXTENSIONS
PLAIN_FILENAMES = %w[readme index].freeze
# Public: Determines if a given filename is compatible with GitHub::Markup.
#
# filename - Filename string to check
#
# Returns boolean
def markup?(filename)
EXTENSIONS.include?(extension(filename))
end
# Public: Determines if a given filename is compatible with
# GitLab-flavored Markdown.
#
# filename - Filename string to check
#
# Returns boolean
def gitlab_markdown?(filename)
MARKDOWN_EXTENSIONS.include?(extension(filename))
end
# Public: Determines if the given filename has AsciiDoc extension.
#
# filename - Filename string to check
#
# Returns boolean
def asciidoc?(filename)
ASCIIDOC_EXTENSIONS.include?(extension(filename))
end
# Public: Determines if the given filename is plain text.
#
# filename - Filename string to check
#
# Returns boolean
def plain?(filename)
extension(filename) == 'txt' || plain_filename?(filename)
end
def previewable?(filename)
markup?(filename)
end
private
def extension(filename)
File.extname(filename).downcase.delete('.')
end
def plain_filename?(filename)
PLAIN_FILENAMES.include?(filename.downcase)
end
end
end
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