rustyline 9.1.2

Rustyline, a readline implementation based on Antirez's Linenoise
Documentation 
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# Config
  max_history_size

# Current session

* we should remember (index) of the first line inserted by this session.
    - if no line has been inserted => do nothing on save
    - reset this index after saving successfully.
* we should remember (path and timestamp) of the file used to initialize/`load` history.
    - if path used to save history is the same:
        + if timestamp is still the same => we can append only new lines if history has not been truncated.
        + update timestamp after saving successfully.
* we should remember (path and timestamp) of the file used to persist/`save` history.
    - reset them if `load` is then called with a different path
    - update them if `load` is then called with same path.
    - update them after saving successfully
    - if path used to save history is the same:
        + if timestamp is still the same => we can append only new lines if history has not been truncated.

```
HistoryInfo
  first_add_index: Option<usize>, // first line inserted by this session
  truncated: bool //
  path_info: Option<PathInfo>,
```
```
PathInfo
  path: Path,
  modified: SystemTime,
```

---
With `termwiz`, you can define your own `History` backend.
`termwiz` does not specify anything how the history is persisted.
Only how to access / search history entry.