Rails "Copy Test Runner Command to Clipboard" for Sublime Text 2

Context.sublime-menu

[
    { "command": "get_single_test_run", "caption": "Copy Test Runner Command to Clipboard" },
    { "caption": "-", "id": "end" }
]

get_single_test_run_command.py

import sublime
import sublime_plugin


class GetSingleTestRunCommand(sublime_plugin.TextCommand):
    EXTENSIONS = ['.rb']
    LINE_MUST_CONTAIN = ["should"]
    COMMAND = "bundle exec testrbl -I test"

    def run(self, edit):
        selection = self.view.sel()
        fileName = self.view.file_name()
        if selection and fileName:
            startOfSelection = selection[0].begin()
            lineNumberOfStartOfSelection = \
                self.view.rowcol(startOfSelection)[0] + 1
            expr = fileName + ":" + str(lineNumberOfStartOfSelection)
            sublime.set_clipboard(self.COMMAND + " " + expr)

    def is_enabled(self):
        lineContent = self.view.substr(self.view.line(self.view.sel()[0]))
        lineMatches = any(x in lineContent for x in self.LINE_MUST_CONTAIN)
        return lineMatches

    def is_visible(self):
        if not self.view.file_name():
            return False
        if not len(self.view.file_name()):
            return False
        return any(
            self.view.file_name().endswith(ext)
            for ext in self.EXTENSIONS
        )