🚀 go-pugleaf

GNU Emacs 18.53 and 18.55

The docstring for column functions should be more precise.  In
particular, behavior at end-of-line, at multiple-column characters
(tabs, control chars, etc.), and with selective-display is incomplete
or ambiguous.  (and also redundant between functions)


Suggested text:


move-to-column:

Move point to column COLUMN in the current line.  If that column lies
within a multiple-column character (tab, control char), moves to next
possible column; if beyond end-of-line, moves to end-of-line.  Returns
resulting current-column (qv).


current-column:

Return the horizontal position of point.

Horizontal position is the sum of the widths of the displayed
representations up to point (eg control characters have a width of 2
or 4, tabs have variable width); beginning of line is column 0.
Screen width is ignored, so it may return values greater than
(screen-width).

When selective-display is t, control-M is treated as end-of-line,
otherwise as a control character.


indent-to-column:

Indent from point with tabs and spaces until COLUMN is reached.
Always do at least MIN spaces even if that goes past COLUMN; by
default, MIN is zero.  Returns resulting current-column (qv).