feat: support gsub_file
erroring if gsub doesn't change anything, and add gsub_file!
#877
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This is a straw-person solution for #874 - overall I think it's not bad but expect changes to be requested; in particular, the option name is pretty verbose so happy if someone wants to suggest an alternative though to me really its about having
gsub_file!
.A bonus to this is that anything using
gsub_file
also supports this behaviour such ascomment_lines
anduncomment_lines
- I think it would be nice to have bang versions of such methods too but want to get the core behaviour/implementation nailed down first.Resolves #874