bug#44592: In sh-script-mode, should the syntax of . and / be made symbol?

[Dario Gjorgjevski <dario.gjorgjevski@gmail.com>]

In the syntax table of sh-script-mode, the syntax of . and / is
punctuation.  This has the advantage of being able to use, e.g.,
kill-sexp to kill one component of a path.  However, it also has the
disadvantage of not correctly indenting line continuations when a path
to a command is given.

As an example, consider:

    relative-path/to/configure --prefix=$prefix             \
                               --with-x                     \
                               --with-x-toolkit=gtk3        \
                               --with-cairo

(This is how I would expect it to be indented.)  Currently,
sh-script-mode would consider only relative-path to be the first sexp on
the leading line and therefore indent it as:

    relative-path/to/configure --prefix=$prefix     \
                 --with-x                           \
                 --with-x-toolkit=gtk3              \
                 --with-cairo

Changing the syntax of . and / to symbol would make the entire
relative-path/to/configure be considered the first sexp and therefore
give the correct indentation show above.

Moreover, one would then be able to use, e.g., kill-sexp to kill a full
path as opposed to just one component.

What do you think?  Alternatively, we could work on fixing only the
SMIE-provided indentation and leave the syntax as it is.

Best regards,
Dario

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