Shannon Booth d0fb816ac3 Shell: Implement a "cd history" (cdh) builtin ...

`cdh` with no arguments dumps the last 8 cd calls in history, and
`cdh [index]` can be used to cd to re-run a specific index from that
history. `cdh` itself it a thin wrapper of the `cd` builtin.

There's definitely some improvements that can be made for this command,
but this seems like a good starting point for getting a feel for it and
ideas for changing it in the future.

It's not entirely clear whether we should be storing the resolved path -
or simply just the last argument passed to cd. For now we just use the
last path passed into cd as this seemed like the better option for now.

This means:
 * invalid paths will still be stored in history (potentially useful)
 * cdh's can be repeated for duplicate directory names
 * the history looks a little nicer on the eyes

It might make sense to use resolved paths.

Closes #397

2020-03-09 19:35:36 +01:00

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