Class: Linguist::Shebang
- Inherits:
-
Object
- Object
- Linguist::Shebang
- Defined in:
- lib/linguist/shebang.rb
Class Method Summary collapse
-
.call(blob, candidates) ⇒ Object
Public: Use shebang to detect language of the blob.
-
.interpreter(data) ⇒ Object
Public: Get the interpreter from the shebang.
Class Method Details
.call(blob, candidates) ⇒ Object
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.
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# File 'lib/linguist/shebang.rb', line 15 def self.call(blob, candidates) return [] if blob.symlink? languages = Language.find_by_interpreter interpreter(blob.data) candidates.any? ? candidates & languages : languages end |
.interpreter(data) ⇒ Object
Public: Get the interpreter from the shebang
Returns a String or nil
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# File 'lib/linguist/shebang.rb', line 25 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 |