Class: Linguist::Shebang
- Inherits:
-
Object
- Object
- Linguist::Shebang
- Defined in:
- lib/linguist/shebang.rb
Class Method Summary collapse
-
.call(blob, _ = nil) ⇒ 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, _ = nil) ⇒ Object
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# File 'lib/linguist/shebang.rb', line 13 def self.call(blob, _ = nil) Language.find_by_interpreter interpreter(blob.data) 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 20 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 |