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The default characters sent for this were incorrect. Delete now sends
xterm-compatible escapes (dch1, kdch1), and Backspace sends the delete
code 0x7f.
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It's a generic impl of `input::Notify` for `Write` types; as such, it
seems completely reasonable to include in the input module. Moving it
also serves to declutter main.
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This doesn't currently handle any of the modifiers, but it does mean
applications like `htop` can be used.
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There's a number of keys/combinations that should emit escape sequences
to the PTY when triggered. This commit adds a framework to support that.
The input::Processor is a type which tracks state of modifier keys. When
special keys (like arrow, function) are detected, the processor pulls up
a list of candidate escapes to send, and picks the first one based on
terminal mode and active modifier keys. The input::Processor is generic
over the thing receiving the escape sequences, the input::Notify type.
Included is a wrapper for `&mut io::Write` which implements
input::Notify and is currently used to connect the processor to the PTY
stream.
This added handling of the APP_CURSOR mode which changes affects input
processing.
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