> Thanks but :{range}! only filters entire lines from the buffer.
> I need something finer grained.
You may use system() with 2 arguments, but your “finer grained” filter will be
tricky. You can check out my translit3: it has command to transliterate
selection. Command achieves the following task:
1. It transliterates whatever you have selected: i.e. works with character- and
block-wise selections in addition to line-wise.
2. It does not alter any registers, jump list (except for last change jump
list) or last selection. If you remove this requirement task will be far, far
easier.
3. It add only one item to undo tree.
. Functions used to achieve this:
1. For character-wise selection:
1. To get characters that will be transliterated:
https://sourceforge.net/p/translit3/code/ci/fc8da4b019def8f84fe2f426639a9e37ee9dc7e2/tree/autoload/translit3.vim#l2119
2. Just the next function deletes character range (guess it could be
achieved with normal! without giving up the second restriction):
http://sourceforge.net/p/translit3/code/ci/fc8da4b019def8f84fe2f426639a9e37ee9dc7e2/tree/autoload/translit3.vim#l2146.
3. And the third one puts given text in given position (the least verbose
one):
http://sourceforge.net/p/translit3/code/ci/fc8da4b019def8f84fe2f426639a9e37ee9dc7e2/tree/autoload/translit3.vim#l2177.
Note: functions operate on lists like “getline(start, end)” or “readfile()”
return. Without my patch that adds “system()” equivalent that returns same
lists and accepts such list as a second argument you have to rely on “split()”
and “join()” (assuming you do not care about possible NULs in filtered lines or
filter result).
2. For line-wise and block-wise selections:
http://sourceforge.net/p/translit3/code/ci/fc8da4b019def8f84fe2f426639a9e37ee9dc7e2/tree/autoload/translit3.vim#l2233
(note: block-wise part contains bug: it transliterates one more line. You need
to change “line<=eline” conditions into “line<eline”. I will release the fix
soon).
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