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