Meson build: sage pexpect interface broken due to missing sage-ipython

[antonio-rojas]

Steps To Reproduce

When sage is built with meson, the sage pexpect interface is broken because it uses the no longer available sage-ipython script.

sage: Sage()("1")

Expected Behavior

No error

Actual Behavior

---------------------------------------------------------------------------
ExceptionPexpect                          Traceback (most recent call last)
File /usr/lib/python3.13/site-packages/sage/interfaces/expect.py:512, in Expect._start(self, alt_message, block_during_init)
    511 try:
--> 512     self._expect = SageSpawn(cmd,
    513             logfile=self.__logfile,
    514             timeout=None,  # no timeout
    515             env=pexpect_env,
    516             name=self._repr_(),
    517             echo=self._terminal_echo,
    518             # Work around https://bugs.python.org/issue1652
    519             preexec_fn=lambda: signal.signal(signal.SIGPIPE, signal.SIG_DFL),
    520             quit_string=self._quit_string())
    522     # Attempt to shutdown the running process gracefully
    523     # when sage terminates.

File sagespawn.pyx:66, in sage.interfaces.sagespawn.SageSpawn.__init__()

File sagespawn.pyx:67, in sage.interfaces.sagespawn.SageSpawn.__init__()

File /usr/lib/python3.13/site-packages/pexpect/pty_spawn.py:205, in spawn.__init__(self, command, args, timeout, maxread, searchwindowsize, logfile, cwd, env, ignore_sighup, echo, preexec_fn, encoding, codec_errors, dimensions, use_poll)
    204 else:
--> 205     self._spawn(command, args, preexec_fn, dimensions)
    206 self.use_poll = use_poll

File /usr/lib/python3.13/site-packages/pexpect/pty_spawn.py:276, in spawn._spawn(self, command, args, preexec_fn, dimensions)
    275 if command_with_path is None:
--> 276     raise ExceptionPexpect('The command was not found or was not ' +
    277             'executable: %s.' % self.command)
    278 self.command = command_with_path

ExceptionPexpect: The command was not found or was not executable: sage-ipython.

During handling of the above exception, another exception occurred:

RuntimeError                              Traceback (most recent call last)
File /usr/lib/python3.13/site-packages/sage/interfaces/expect.py:1518, in ExpectElement.__init__(self, parent, value, is_name, name)
   1517 try:
-> 1518     self._name = parent._create(value, name=name)
   1519 # Convert ValueError and RuntimeError to TypeError for
   1520 # coercion to work properly.

File /usr/lib/python3.13/site-packages/sage/interfaces/interface.py:520, in Interface._create(self, value, name)
    519 name = self._next_var_name() if name is None else name
--> 520 self.set(name, value)
    521 return name

File /usr/lib/python3.13/site-packages/sage/interfaces/sage0.py:332, in Sage.set(self, var, value)
    331 cmd = '%s=%s' % (var, value)
--> 332 out = self.eval(cmd)
    333 if 'Traceback' in out:

File /usr/lib/python3.13/site-packages/sage/interfaces/sage0.py:319, in Sage.eval(self, line, strip, **kwds)
    318 line = self._wrap_multiline(line)
--> 319 return Expect.eval(self, line, **kwds).strip()

File /usr/lib/python3.13/site-packages/sage/interfaces/expect.py:1412, in Expect.eval(self, code, strip, synchronize, locals, allow_use_file, split_lines, **kwds)
   1411 elif split_lines:
-> 1412     return '\n'.join(self._eval_line(L, allow_use_file=allow_use_file, **kwds)
   1413                      for L in code.split('\n') if L)
   1414 else:

File /usr/lib/python3.13/site-packages/sage/interfaces/expect.py:1412, in <genexpr>(.0)
   1411 elif split_lines:
-> 1412     return '\n'.join(self._eval_line(L, allow_use_file=allow_use_file, **kwds)
   1413                      for L in code.split('\n') if L)
   1414 else:

File /usr/lib/python3.13/site-packages/sage/interfaces/expect.py:988, in Expect._eval_line(self, line, allow_use_file, wait_for_prompt, restart_if_needed)
    987 if self._expect is None:
--> 988     self._start()
    989 E = self._expect

File /usr/lib/python3.13/site-packages/sage/interfaces/expect.py:529, in Expect._start(self, alt_message, block_during_init)
    527     except (ExceptionPexpect, pexpect.EOF) as e:
    528         # Change pexpect errors to RuntimeError
--> 529         raise RuntimeError("unable to start %s because the command %r failed: %s\n%s" %
    530                 (self.name(), cmd, e, self._install_hints()))
    531 except BaseException:

RuntimeError: unable to start sage because the command 'sage-ipython --HistoryManager.hist_file=:memory: --colors=nocolor --no-term-title --simple-prompt' failed: The command was not found or was not executable: sage-ipython.


During handling of the above exception, another exception occurred:

TypeError                                 Traceback (most recent call last)
Cell In[1], line 1
----> 1 Sage()("1")

File /usr/lib/python3.13/site-packages/sage/interfaces/sage0.py:254, in Sage.__call__(self, x)
    251         return self(x.sage())
    253 if isinstance(x, str):
--> 254     return SageElement(self, x)
    256 if self.is_local():
    257     with open(self._local_tmpfile(), 'wb') as fobj:

File /usr/lib/python3.13/site-packages/sage/interfaces/expect.py:1523, in ExpectElement.__init__(self, parent, value, is_name, name)
   1521 except (RuntimeError, ValueError) as x:
   1522     self._session_number = -1
-> 1523     raise TypeError(*x.args)
   1524 except BaseException:
   1525     self._session_number = -1

TypeError: unable to start sage because the command 'sage-ipython --HistoryManager.hist_file=:memory: --colors=nocolor --no-term-title --simple-prompt' failed: The command was not found or was not executable: sage-ipython.

Additional Information

No response

Environment

• OS: Arch Linux
• Sage Version: 10.7.beta0

Checklist

• I have searched the existing issues for a bug report that matches the one I want to file, without success.
• I have read the documentation and troubleshoot guide

[Krishnadubey1008]

@antonio-rojas should we recreate the sage-ipython script.

[antonio-rojas]

I don't think the full sage-ipython is required. It is only used to start a sage session without colors and ansi codes so the output is machine parseable. Probably a "simple mode" for sage that does just that would be enough (would be good if it's still called --simple-prompt for backwards compatibility, since this is also used by some thirt-party UIs)

[Krishnadubey1008]

so, we only need to replace sage-ipython by --simple-prompt in files like sage0.py ,correct me if I am missing something

[antonio-rojas]

Yes (but of course --simple-prompt needs to be implemented first)

[krishna7369]

@antonio-rojas if I am correct sage/src/sage/cli/init.py is the script where I should make changes and add --simple-prompt inside parser.add_argument