Completion
While most people use some sort of auto-completion plugin, vim and neovim actually have pretty decent completion functionality built-in. If you take a look at :help ins-completion you will see a list of various completion sources, like buffer words, entire lines, file paths, tags, dictionary words, and more. To be fair, some of these are pretty useless. When writing code you will probably not find yourself using a thesaurus very frequently. However, there are two completion mechanisms that stand out here: userfunc and omnifunc. Both work the exact same way, don’t ask me why there’s two of them; for simplicity’s sake I’m just going to say “omnifunc” from now on, but I mean both, technically. ...