Error in SetKeyword when ft=racket

[meithecatte]

1. vi test.rkt
2. i(<ESC>
3. ,W

Expected result: (())
Actual result:

Error detected while processing function PareditWrap[1]..<SNR>23_SetKeyword:
line    3:
E474: Invalid argument: iskeyword+=+,-,*,/,%,<,=,>,:,$,?,!,@-@,94,~,#,|,&
Press ENTER or type command to continue

This seems to be caused by repeated values, the racket plugin seems to set iskeyword=@,48-57,_,192-255,#,%,^.

[kovisoft]

Could you please tell me what racket plugin are you using?

[meithecatte]

Sorry for that! I've set it up so long ago that I assumed it was a part of the default vim installation...

It's https://github.com/wlangstroth/vim-racket

[kovisoft]

Strange, it seems that vim cannot append anything to iskeyword if it contains a ^ character.
Fixed in commit 462713f

[meithecatte]

Hmm, do you think this is intended behavior? Maybe it would be worth it to report a bug upstream?

Also, thanks! Your plugin is probably the one that impacts my Vim experience the most.

[kovisoft]

I'm not sure if this is a bug or something I'm not aware of. Anyway it's easy to reproduce:

:setlocal iskeyword=^
:setlocal iskeyword+=+
E474: Invalid argument: iskeyword+=+

[cwfoo]

@kovisoft The behavior for ^ (caret) is documented in :help isfname:

https://github.com/vim/vim/blob/v8.2.2556/runtime/doc/options.txt#L4514-L4519

	If a part starts with '^', the following character number or range
	will be excluded from the option.  The option is interpreted from left
	to right.  Put the excluded character after the range where it is
	included.  To include '^' itself use it as the last character of the
	option or the end of a range.  Example:
		"^a-z,#,^"	(exclude 'a' to 'z', include '#' and '^')

https://github.com/vim/vim/blob/v8.2.2556/runtime/doc/options.txt#L4529-L4531

	A comma can be excluded by prepending a '^'.  Example:
		" -~,^,,9"	All characters from space to '~', excluding
				comma, plus <Tab>.

[kovisoft]

Ah, thank you very much, I was not aware of this. Now I see what the real problem is. And I think my above fix is not fully okay, because I need to check for ^ that is the very last character of the option. Other ^ characters somewhere inside the option don't cause problems.

[cwfoo]

Strange, it seems that vim cannot append anything to iskeyword if it contains a ^ character.
Fixed in commit 462713f

paredit/plugin/paredit.vim

Lines 283 to 290 in 462713f

	if &ft =~ s:fts_balancing_all_brackets
	setlocal iskeyword+=+,-,*,/,%,<,=,>,:,$,?,!,@-@,94,~,#,\|,&
	else
	setlocal iskeyword+=+,-,*,/,%,<,=,>,:,$,?,!,@-@,94,~,#,\|,&,.,{,},[,]
	endif
	if match(old_value, '\^') >= 0
	setlocal iskeyword+=^
	endif

Why is setlocal iskeyword+=^ needed when 94 has already been added to iskeyword?

[kovisoft]

You are absolutely right, thanks for all your comments. I removed the setlocal iskeyword+=^, see commit d1176a7