GNU bug report logs - #37951
27.0.50; octave completion-at-point for fieldnames

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From: noah <noah.v.peart <at> gmail.com>
To: 37951 <at> debbugs.gnu.org
Subject: bug#37951: 27.0.50; octave completion-at-point for fieldnames
Date: Sun, 27 Oct 2019 19:22:43 -0400

This is relevant to octave.el (should I be sending to a different
list or tagging it somehow?)

The completion-at-point functions in both octave source buffers
and inferior octave buffers don't complete for fieldnames of
eg. structs. For example, it would be nice to get completion
candidates after '.' in these cases

    octave> s(1) = struct('field1', [], 'field2', [])
    octave> s(2) = struct('field1', [], 'field2', [])
    octave> s.         # case 1
    octave> s(1).      # case 2
    
This is simply a matter of not capturing the correct bounds of
objects at point in `octave-completion-at-point` and
`inferior-octave-completion-at-point`.

The octave function `completion_matches` already returns the correct
completion candidates ("s.field1" "s.field2") when passed the full
"s." or "s(1)." strings in the above example.

The following modification to retrieve the bounds of the object
at point seems to work in both source and inferior buffers.

    (defun my-octave-bounds-of-object-at-point (&optional lim)
      (let ((beg (save-excursion
                   (skip-syntax-backward "w_" lim)
                   ;; just this extra check
                   (when (eq ?. (char-before))
                     (forward-char -1)
                     (and (eq ?\) (char-before)) ; struct(i).
                          (ignore-errors (backward-sexp)))
                     (skip-syntax-backward "w_" lim))
                   (point)))
            (end (point)))
        (when (< beg end)                   ; extends region past point
          (save-excursion
            (skip-syntax-forward "w_")
            (setq end (point))))
        (when (> end beg)
          (cons beg end))))

However, being pretty new to octave, I'm not sure about all the cases
where this completion would be applicable.


In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2019-10-27 built on noah-M51AC
Repository revision: 0e4dd67aae8b10032317a29a6bd99d2d4a64c897
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 18.04.3 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
user-error: Beginning of history; no preceding item
previous-line: Beginning of buffer

Configured using:
 'configure --prefix=/usr/local --with-modules --with-xwidgets'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND GPM DBUS GSETTINGS GLIB NOTIFY INOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS JSON
PDUMPER LCMS2 GMP

Important settings:
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  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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  blink-cursor-mode: t
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  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
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make-network-process emacs)

Memory information:
((conses 16 44989 6110)
 (symbols 48 6002 1)
 (strings 32 15444 1947)
 (string-bytes 1 504797)
 (vectors 16 10036)
 (vector-slots 8 129209 9586)
 (floats 8 20 24)
 (intervals 56 189 0)
 (buffers 1000 11))

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