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Contents
module Linguist
class Shebang
# Public: Use shebang to detect language of the blob.
#
# blob - An object that quacks like a blob.
# candidates - A list of candidate languages.
#
# Examples
#
# Shebang.call(FileBlob.new("path/to/file"))
#
# Returns an array of languages from the candidate list for which the
# blob's shebang is valid. Returns an empty list if there is no shebang.
# If the candidate list is empty, any language is a valid candidate.
def self.call(blob, candidates)
return [] if blob.symlink?
languages = Language.find_by_interpreter interpreter(blob.data)
candidates.any? ? candidates & languages : languages
end
# Public: Get the interpreter from the shebang
#
# Returns a String or nil
def self.interpreter(data)
shebang = data.lines.first
# First line must start with #!
return unless shebang && shebang.start_with?("#!")
s = StringScanner.new(shebang)
# There was nothing after the #!
return unless path = s.scan(/^#!\s*\S+/)
# Keep going
script = path.split('/').last
# if /usr/bin/env type shebang then walk the string
if script == 'env'
s.scan(/\s+/)
s.scan(/.*=[^\s]+\s+/) # skip over variable arguments e.g. foo=bar
script = s.scan(/\S+/)
end
# Interpreter was /usr/bin/env with no arguments
return unless script
# "python2.6" -> "python2"
script.sub!(/(\.\d+)$/, '')
# #! perl -> perl
script.sub!(/^#!\s*/, '')
# Check for multiline shebang hacks that call `exec`
if script == 'sh' &&
data.lines.first(5).any? { |l| l.match(/exec (\w+).+\$0.+\$@/) }
script = $1
end
File.basename(script)
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems