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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