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Contents
module Linguist
module Strategy
class Modeline
EMACS_MODELINE = /-\*-\s*(?:(?!mode)[\w-]+\s*:\s*(?:[\w+-]+)\s*;?\s*)*(?:mode\s*:)?\s*([\w+-]+)\s*(?:;\s*(?!mode)[\w-]+\s*:\s*[\w+-]+\s*)*;?\s*-\*-/i
# First form vim modeline
# [text]{white}{vi:|vim:|ex:}[white]{options}
# ex: 'vim: syntax=ruby'
VIM_MODELINE_1 = /(?:vim|vi|ex):\s*(?:ft|filetype|syntax)=(\w+)\s?/i
# Second form vim modeline (compatible with some versions of Vi)
# [text]{white}{vi:|vim:|Vim:|ex:}[white]se[t] {options}:[text]
# ex: 'vim set syntax=ruby:'
VIM_MODELINE_2 = /(?:vim|vi|Vim|ex):\s*se(?:t)?.*\s(?:ft|filetype|syntax)=(\w+)\s?.*:/i
MODELINES = [EMACS_MODELINE, VIM_MODELINE_1, VIM_MODELINE_2]
# Scope of the search for modelines
# Number of lines to check at the beginning and at the end of the file
SEARCH_SCOPE = 5
# Public: Detects language based on Vim and Emacs modelines
#
# blob - An object that quacks like a blob.
#
# Examples
#
# Modeline.call(FileBlob.new("path/to/file"))
#
# Returns an Array with one Language if the blob has a Vim or Emacs modeline
# that matches a Language name or alias. Returns an empty array if no match.
def self.call(blob, _ = nil)
header = blob.lines.first(SEARCH_SCOPE).join("\n")
footer = blob.lines.last(SEARCH_SCOPE).join("\n")
Array(Language.find_by_alias(modeline(header + footer)))
end
# Public: Get the modeline from the first n-lines of the file
#
# Returns a String or nil
def self.modeline(data)
match = MODELINES.map { |regex| data.match(regex) }.reject(&:nil?).first
match[1] if match
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems