Module: Language::Python::Shebang

Defined in:
language/python.rb

Overview

Mixin module for Formula adding shebang rewrite features.

Constant Summary collapse

PYTHON_SHEBANG_REGEX =

A regex to match potential shebang permutations.

%r{^#! ?/usr/bin/(?:env )?python(?:[23](?:\.\d{1,2})?)?( |$)}.freeze
PYTHON_SHEBANG_MAX_LENGTH =

The length of the longest shebang matching SHEBANG_REGEX.

"#! /usr/bin/env pythonx.yyy ".length

Class Method Summary collapse

Class Method Details

.detected_python_shebang(formula = self, use_python_from_path: false) ⇒ Utils::Shebang::RewriteInfo

Parameters:

  • formula (T.untyped) (defaults to: self)
  • use_python_from_path (Boolean) (defaults to: false)

Returns:



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# File 'language/python.rb', line 114

def detected_python_shebang(formula = self, use_python_from_path: false)
  python_path = if use_python_from_path
    "/usr/bin/env python3"
  else
    python_deps = formula.deps.map(&:name).grep(/^python(@.+)?$/)
    raise ShebangDetectionError.new("Python", "formula does not depend on Python") if python_deps.empty?
    if python_deps.length > 1
      raise ShebangDetectionError.new("Python", "formula has multiple Python dependencies")
    end

    python_dep = python_deps.first
    Formula[python_dep].opt_bin/python_dep.sub("@", "")
  end

  python_shebang_rewrite_info(python_path)
end