Learn how to indent the buffer the way it currently is.
Output in buffer "*indent*" shows any lines which have conflicting
values of a variable, and the final value of all variables learned.
When called interactively, pop to this buffer automatically if
there are any discrepancies.
If no prefix ARG is given, then variables are set to numbers.
If a prefix arg is given, then variables are set to symbols when
applicable -- e.g. to symbol `+' if the value is that of the
basic indent.
If a positive numerical prefix is given, then `sh-basic-offset'
is set to the prefix's numerical value.
Otherwise, sh-basic-offset may or may not be changed, according
to the value of variable `sh-learn-basic-offset'.
Abnormal hook `sh-learned-buffer-hook' if non-nil is called when the
function completes. The function is abnormal because it is called
with an alist of variables learned. This feature may be changed or
removed in the future.
This command can often take a long time to run.