I would like to compare to constants, not strings

[danehammer]

		switch keypress := msg.String(); keypress {
		case "ctrl+c":

This just feels a little dirty. I see there's constants in key.go, can we export them?

[hopefulTex]

The key example at the bottom shows how you can set and check keybindings.
You can use key.Matches(msg, keybind) for your cases.
Check the bottom of the README

[meowgorithm]

Hi! There actually are exported constants for keys.

A KeyMsg is really just a Key, which looks like this:

type Key struct {
	Type  KeyType
	Runes []rune
	Alt   bool
}

So here's how you could work with key constants:

switch msg := msg.(type) {
case KeyMsg:
    switch msg.Type {
    case tea.KeyEnter:
        fmt.Println("you pressed enter!")
    case tea.KeyRunes:
        switch string(msg.Runes) {
        case "a":
            fmt.Println("you pressed a!")
        }
    }
}

Keep in mind there are no constants for letter keys (such as the "a" key) because we need to be able to match all sorts of input like ö, ø, and 猫—hence KeyRunes. Additionally, Input method editors can input several runes at once (i.e. 猫咪), hence the need for a slice.

Anyway, for more info see Key, KeyMsg, and KeyType in the docs.