Add option to use emacs keymaps in prompt window - #147
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Fuzzbox normally follows Vim cmdline editing keymaps, but if you prefer the Emacs style keymaps that are the default in Readline and probably the default in your shell, you can now set g:fuzzbox_emacs_keys to true
Map CTRL-K to delete from cursor to end of line in prompt when Emacs keys are enabled and replace previous CTRL-K mappings in FuzzyMru and FuzzyHighlights with CTRL-Y. Why CTRL-Y? Honestly, mostly because I'm used to it from vim-unimpaired, where it is used because "if you tilt it a bit it looks like a switch". But, also because it doesn't make sense to apply Vim's CTRL-Y scroll up behaviour in Fuzzbox as its opposite in Vim to scroll down is CTRL-E, and CTRL-E is already used to moves the cursor to the end of the line, same as Vim's cmdline editing or Readline's Emacs mode in a shell.
Update FuzzyHighlights and FuzzyMru to continue to support CTRL-K toggle mapping when emacs editing mode has not been enabled, but show a warning
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Fuzzbox normally follows Vim cmdline editing keymaps, but if you prefer the Emacs style keymaps that are the default in Readline and probably the default in your shell, you can now set
g:fuzzbox_emacs_keysto true.Related to #145