What does the r cpoptions flag do? Via :help cpo-r:
Redo ("." command) uses "/" to repeat a search command, instead of the actually used search string.
I understand that . repeats the last change, but I don't understand how search is involved.
Can you give me an example of how cpoptions-=r and cpoptions+=r behave differently?
Let's assume you just performed the following theoretically dot-repeatable command, which involves search:
d/foo<CR> After that, you moved the cursor somewhere else:
/three<CR> where you want to repeat the last deletion:
. With cpoptions-=r, doing . will repeat the command exactly as typed: the text from the cursor to the next foo is deleted:
d/foo<CR>,d/foo<CR>.No surprise.
With cpoptions+=r, the command reuses the last search, in this case three, not the one you used in the supposedly dot-repeatable command:
d/foo<CR>,d/three<CR>, not d/foo<CR>,d//: "delete until next match of the last search pattern" instead of "delete until the next foo".Surprise!
This behavior was somewhat expected in Vi but it was (rightfully, might I say) considered unintuitive and thus improved in Vim while leaving an escape hatch for people who preferred the Vi way. That is the whole point of :help 'cpotions'.
