parfit reflows the prose in code comments to a target width, it only moves comments and leaves code and directives untouched.

A comment that looks like this:

```

// Curiously enough, the only thing that went through the mind of the bowl of petunias as it fell was 'Oh no, not again.' Many people have speculated that if we knew exactly why the bowl of petunias had thought that we would know a lot more about the nature of the universe than we do now.

```

Gets reflowed into this:

```

// Curiously enough, the only thing that went through the mind of

// the bowl of petunias as it fell was 'Oh no, not again.' Many

// people have speculated that if we knew exactly why the bowl of

// petunias had thought that we would know a lot more about the

// nature of the universe than we do now.

```

Inspired by `par` and my general fondness of RFC documentation.