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Parse command flags with optparser #809

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Parse command flags with optparser #809

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@st0012 st0012 commented Dec 9, 2023

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@st0012 st0012 added the enhancement New feature or request label Dec 9, 2023
Currently, we simply split the input on whitespace and use the first
word as the command name to check if it's a command. But this means that
assigning a local variable which's name is the same as a command will
also be recognized as a command.

For example, in the following case, `info` is recognized as a command:

```
irb(main):001> info = 123
`debug` command is only available when IRB is started with binding.irb
=> nil
```

This commit improves the command input recognition by using more sophis-
ticated regular expressions.
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