User-input in output, like dmenu

[0ion9]

Dmenu does not only allow filtering of the items piped in by typing, but also allows the user to input their own string. This is a useful feature if you want to provide a list of preset items but custom items are also valid.

For example,

printf '%s\n' foo bar | percol and input 'baz'. Percol currently outputs nothing, because no items are matched. A keyboard shortcut that quits and outputs all of the selected items AND the user input as-is, would be helpful. I specify it in that way because then it can be used to simultaneously filter a list and add an item to that list for future invocations to use.

In my mind, such a feature would have to explicitly depend on multiple selection and not on standard filtering-- otherwise, if the number of matches to the user-inputted string was >0, then the output would usually not be what the user intended.

Suggestions for less confusing issue title are welcome ;)