Method shebang

IPython/core/magics/script.py:158–245

Run a cell via a shell command The `%%script` line is like the #! line of script, specifying a program (bash, perl, ruby, etc.) with which to run. The rest of the cell is run by that program. Examples -------- ::

(self, line, cell)

    @script_args
    @cell_magic("script")
    def shebang(self, line, cell):
        """Run a cell via a shell command
        
        The `%%script` line is like the #! line of script,
        specifying a program (bash, perl, ruby, etc.) with which to run.
        
        The rest of the cell is run by that program.
        
        Examples
        --------
        ::
        
            In [1]: %%script bash
               ...: for i in 1 2 3; do
               ...:   echo $i
               ...: done
            1
            2
            3
        """
        argv = arg_split(line, posix = not sys.platform.startswith('win'))
        args, cmd = self.shebang.parser.parse_known_args(argv)
        
        try:
            p = Popen(cmd, stdout=PIPE, stderr=PIPE, stdin=PIPE)
        except OSError as e:
            if e.errno == errno.ENOENT:
                print("Couldn't find program: %r" % cmd[0])
                return
            else:
                raise
        
        if not cell.endswith('\n'):
            cell += '\n'
        cell = cell.encode('utf8', 'replace')
        if args.bg:
            self.bg_processes.append(p)
            self._gc_bg_processes()
            to_close = []
            if args.out:
                self.shell.user_ns[args.out] = p.stdout
            else:
                to_close.append(p.stdout)
            if args.err:
                self.shell.user_ns[args.err] = p.stderr
            else:
                to_close.append(p.stderr)
            self.job_manager.new(self._run_script, p, cell, to_close, daemon=True)
            if args.proc:
                self.shell.user_ns[args.proc] = p
            return
        
        try:
            out, err = p.communicate(cell)
        except KeyboardInterrupt:
            try:
                p.send_signal(signal.SIGINT)
                time.sleep(0.1)