[feature] Add ability to output selection when exiting

[pyhedgehog]

...as a continuation of #209.

As I've commented in original issue yank feature is something different.

1. How to customize what console program think clipboard is? I.e. I'm using windows and connecting to linux via several ssh hops... you understand.
2. How to use this (as was asked in #132 and #209) as a dialog-like selector in script? I.e. I've planned to write curl http://example.com/something.json|fx --select-value|jq -c 'to_entries[]'|sponge entries.jsonl. In some other script you can write something like:

jq 'del(.[].data)' long.json >short.json
path=`fx --select-path short.json`
jq -r "$path|.data" long.json | base64 -d >data.png

[antonmedv]

Done! Now you can print selected part of json:

Here is preview (type p):

Or type P to output it to stdout.

fx file.json > selected.json

Will be released in fx v32.

[eadmaster]

i've just downloaded fx v33, and both --select-path and --select-value switches are not working:

ReferenceError: select is not defined
    at Object.eval (eval at run (/tmp/fx-33.0.0.js:141:14), <anonymous>:3:7)
    at run (/tmp/fx-33.0.0.js:141:25)
    at transform (/tmp/fx-33.0.0.js:74:20)
    at main (/tmp/fx-33.0.0.js:59:13)

[antonmedv]

Those flags are not supposed. Value is printed by default.

[eadmaster]

Or type P to output it to stdout.

oh, i see it now, i have to press "P" instead of Enter.