bug#14732: Package dos-mode for ELPA

[Arni Magnusson <arnima@hafro.is>]

Hi Stefan,

Do you think that `dos-mode' could perhaps make it to Emacs core (i.e. 
lisp/progmodes) instead of becoming an optional ELPA download?

The current `bat-generic-mode' provides surprisingly limited 
syntax-highlighting, and earlier we discussed that instead of submitting a 
patch for the generic mode, it would be better if I rewrite it as a 
derived mode. While doing that, my design goal was to write a minimalistic 
replacement of `bat-generic-mode' with the following improvements:

- highlighting of more commands: at attrib color date dir doskey endlocal 
erase fc find mkdir more move popd pushd rmdir setlocal sort time title 
type xcopy

- highlighting of more control flow keywords: cmd defined else equ exit 
geq gtr in leq lss neq

- highlighting of called script: call foo

- highlighting of %%variable: for %%X in (bark meow) do echo %%X

- highlighting of defined variable: if defined VAR

I studied other code inside progmodes to use a similar style, both 
internally and in the user interface, which has a menu with a few basic 
but useful commands.

At 6333 bytes, I think it is a substantial improvement in Emacs support 
for Dos scripts. I believe it would make many Emacs users happy to have 
`auto-mode-alist' turn on `dos-mode' for the "bat" filename extension. 
Actually, the net increase in code should be less than 6333 bytes, because 
almost all remnants of `bat-generic-mode' could be deleted.

An analogous improvement was when `js-mode' replaced the old 
`javascript-generic-mode'.

I would of course be fine with `dos-mode' being an ELPA package (my 
initial proposal), but I just think Emacs should out-of-the-box have 
slightly better support for editing Dos scripts. They are an unpopular but 
necessary part of many free software projects, and developers would 
appreciate to at least see the common Dos keywords colored.

Perhaps ELPA could be a stepping stone towards the venerable progmodes? A 
kind of a review process and a general call for a SMIE patch? In that 
case, we should probably change the header comment "This file is part of 
GNU Emacs". Just to be explicit, I'm happy to have the Emacs developers 
make any changes to the proposed 
http://www.emacswiki.org/emacs/download/dos.el.

All the best,

Arni

P.S. I have received and signed the copyright assignment, and mailed it to 
the Assignment Administrator (D. Robertson) on 25 July.



On Sun, 4 Aug 2013, Stefan Monnier wrote:

> [ Slowly going back over some of that email backlog. ]
>
>> http://www.emacswiki.org/emacs/download/dos.el
>
> Thanks you.  The code looks ready for ELPA (I'd use call-process a bit 
> more often than shell-command, to avoid quoting issues, tho).
>
> It would be nice to add some SMIE support to it.
>
>>> However, to accept such changes into Emacs, you will need to do legal 
>>> paperwork
>>
>> Great. I have signed an FSF agreement regarding Texinfo, and I'm more 
>> than willing to do the same for Emacs.
>
> Have you started this process? If not, then please fill the form below 
> and email it as instructed so the FSF can send you the relevant 
> paperwork to sign.
>
>
>        Stefan
>