zsh vi-like search

.zsh-vi-search

function _history-search-backward()
{   
    zle .history-incremental-pattern-search-backward $BUFFER
}
function _history-search-forward()
{   
    zle .history-incremental-pattern-search-forward $BUFFER
}
zle -N history-incremental-pattern-search-backward _history-search-backward
zle -N history-incremental-pattern-search-backward _history-search-forward
bindkey -M vicmd "?" .history-incremental-pattern-search-backward
bindkey -M vicmd "/" .history-incremental-pattern-search-forward
bindkey -M vicmd "N" history-incremental-pattern-search-backward
bindkey -M vicmd "n" history-incremental-pattern-search-forward

.zsh-vi-search makes vi-mode search commands work much more like they do in vi:

1. searches work within commands too, not just across commands,
2. n and N will continue the search forwards and backwards respectively, and
3. / and ? have their vi-like directions of forwards and backwards, instead of the reversed ones that vi-mode in zsh defaults to.