Re: Python indentation script...

On Fri, 26 Aug 2011, Burnett, Rick wrote:

> Hello All!
>
> I've been looking around to see if it is possible to create a script
> or add a feature that I would use quite a bit.
>
> When editing python code, how much a line is indented sets the scope
> of the code, as many of you know, however, sometimes with long scopes
> that are heavily nested, it can be confusing to easily see how many
> indents you need.
>
> What I would LOVE is to set vim similar to where it shows numbers, but
> instead, have the number show the number of indents relative to the
> current setting of ts.
>
> What would happen is this
>
> 1) The number is computed by the number of spaces at the lead
> (^\s*) / tab space setting (ts)
>
> 2) If the number had any remainder (so not zero remainder) this
> means something isn't spaced right, set the text color to orange.
>
> 3) If ANY tabs (\t) are in the line, set the color to red to
> indicate the line needs to be fixed.
>
> I realize computing every line is expensive, but I'd be willing to
> take that hit on turning this one for some of the difficult functions
> I write. It would also be nice if it ran on what was displayed only
> maybe.
>
> Is this possible? Or will I need to actually edit the gvim sourcecode
> for this sort of functionality?

The following seems to do what I think you're describing. Put it in a
file called after/syntax/python.vim, somewhere in your .vim directory in
your home dir. E.g., mine is at: ~/.vim/after/syntax/python.vim:

==> ~/.vim/after/syntax/python.vim <==
" Match any lines with tabs as PythonTabError
syn match PythonTabError /^.*\t.*$/

" Set up something to match lines w/ leading spaces not divisible by 'ts'
if &l:ts > 1
let s:badindent = '^\( \{'.&l:ts.'\}\)* \{1,'.(&l:ts-1).'\}[^ ].*$'
let s:badindent = ':syn match PythonSpacingError /'.s:badindent.'/'
exe s:badindent
endif

" PythonSpacingErrors should be orange (assumes 256-color terminal)
hi PythonSpacingError ctermbg=208 ctermfg=0 guifg=#ff9900

" PythonTabErrors should be red (just show the line the same as an error)
hi link PythonTabError Error
======================================

An example of the 'badindent' regular expression that's generated when
'ts=4':

syn match PythonSpacingError /^\( \{4\}\)* \{1,3\}[^ ].*$/

That matches:
^ -- start of line
\( \{4\}\)* -- any number of correct indentations
\{1,3\} -- followed by a number of spaces not divisible by 'ts'
[^ ] -- followed by a non-space
.*$ -- and the rest of the line

For more on everything:

:help :syn-match
:help :highlight
:help :highlight-link
:help after-directory

--
Best,
Ben

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