vi treats dash - and space as word separators for commands such as dw and cw.
Is there a way to add underscore _ as well?
I quite often want to change part of a variable name containing underscores, such as changing src_branch to dest_branch. I end up counting characters and using s (like 3sdest), but it would be much easier to use cw (like cwdest).
Is there a way to add underscore
_as well?
:set iskeyword-=_
What is, and is not a member character to keywords depends on the language. For help on iskeyword use :help iskeyword.
In case you're using vim, you can change that by setting the iskeyword option (:he iskeyword). If that is not an option, you can always use ct_ instead of counting.
You could type cf_dest_ and save the counting part.
Edit: or as suggested: ct_ changes text until right before the underline character. (I'm using the f motion more, so it came more naturally to me)
Or you could redefine 'iskeyword' (:help iskeyword for details).
I was just looking at this myself and added this to my .vimrc:
set iskeyword=!-~,^*,^45,^124,^34,192-255,^_
My .vimrc had issues with ^| and ^", which was part of the default iskeyword for my setup, so I changed to their ascii values and it works fine. My main modification was to add "^_" to the end of the default setting to keep vim from seeing underscore as being part of a word.
To delete to the next underscore enter "df_" To change to the next underscore enter "cf_" NOTE: don't include the double quotes.