Edit recorded asciicasts (cut and concatenate parts)

[adamschmideg]

This is a feature request I started to work on. The idea is, the user edits the recorded asciicasts and changes the event types. Take for example this recording with edited event types,

[1, "o", "Hel"]
[2, "s", "l"]
[3, "s", "o"]
[4, "d", " whirled"]
[5, "o", " world"]

The extended event types are

• "s": squeeze with the previous event
• "d": delete this event

The result of the above example is

[1, "o", "Hello"]
[5, "o", " world"]

Editing would be invoked asciinema edit --from part1.cast --from part2.cast result.cast. Each input file is processed the way detailed above, then concatenated into a single cast file with the right offset.

[davedittrich]

This is similar to #54.

I agree editing capabilities would be very helpful.