Skip to content

Latest commit

 

History

History
65 lines (55 loc) · 1.45 KB

CONTRIBUTING.md

File metadata and controls

65 lines (55 loc) · 1.45 KB
Raw

How does it work

Every hydra (except pink) is an infinite chain of <Plug>(...) kyebindings.

To enter Hydra used

keymap.set(body..lhs, table.concat{
   '<Plug>(hydra_enter)',
   '<Plug>(hydra_lhs)',
   '<Plug>(hydra_wait)'
})

Then for every red (non-exiting) head the next binding used:

keymap.set('<Plug>(hydra_wait)'..lhs, table.concat{
   '<Plug>(hydra_lhs)',
   '<Plug>(hydra_wait)'
})

Blue (exiting) head:

keymap.set('<Plug>(hydra_wait)'..lhs, table.concat{
   '<Plug>(hydra_exit)',
   '<Plug>(hydra_lhs)'
})

And to correctly exit from hydra, next bindings are set:

keymap.set('<Plug>(hydra_wait)', '<Plug>(hydra_leave)')
keymap.set('<Plug>(hydra_wait)'..<the first N keys in lhs>,
   '<Plug>(hydra_leave)'
)

So the infinite chain of the form

<Plug>(hydra_enter)
<Plug>(hydra_lhs)
<Plug>(hydra_wait)
<Plug>(hydra_lhs)
<Plug>(hydra_wait)
...
<Plug>(hydra_wait)
<Plug>(hydra_exit)
<Plug>(hydra_lhs)

comes out.

Every head's mapping ends with <Plug>(hydra_wait), and since there are exist keymaps that starts with it, Vim is waiting for possible continuation. Pressing any non-head key at this moment will execute:

<Plug>(hydra_wait) --> <Plug>(hydra_leave)

<Plug>(hydra_leave) will check the hydra's color and if hydra is amaranth or teal it will consume the pressed key and send <Plug>(hydra_wait). Otherway it will execute <Plug>(hydra_exit) after which the pressed key will be executed.