gp interface help should use extended help text (from "??")

[sagetrac-cwitty]

<wstein> 
 The new ?? help looks quite nice. It would
 be good for gp.foo? to use it.

The idea is that

sage: foo = gp(x)
sage: foo.polroots?

should use the help text from the gp command ??polroots.

The obvious approach is to change '?%s' to '??%s' in gp.py's help() method. This doesn't quite work, for two reasons:

1. gphelp carefully formats the text to fit in the current line width, and then Sage displays this text indented; so almost every line wraps.

2. gphelp uses control characters to make words bold, underlined, etc.; when the help is viewed from the notebook, these control codes are visible in the output, and look very ugly.

CC: @videlec @jdemeyer @slel

Component: interfaces

Keywords: pari/gp, help

Reviewer: Michael Orlitzky

Issue created by migration from https://trac.sagemath.org/ticket/1062

[mezzarobba]

comment:1

See #17860 for a possible strategy.

[slel]

Changed keywords from none to pari/gp, help

[videlec]

comment:3

This works in cypari2 which is de facto the way to use PARI in Sage

sage: x.polroots?
Signature:      x.polroots(precision)
Docstring:     
   Complex roots of the given polynomial using Schonhage's method, as
   modified by Gourdon.

[orlitzky]

Reviewer: Michael Orlitzky

[fchapoton]

comment:5

I do not agree that this works. We currently display only the short documentation, for pari() objects as well as for gp() objects.

The complete doc is much longer.