Title: Use fzf for ksh history search
       Author: Solène
       Date: 17 October 2021
       Tags: openbsd shell ksh fzf
       Description: 
       
       # Introduction
       
       fzf is a powerful tool to interactively select a line among data piped
       to stdin, a simple example is to pick a line in your shell history and
       it's my main fzf use.
       
       fzf ships with bindings for bash, zsh or fish but doesn't provide
       anything for ksh, OpenBSD default shell.  I found a way to run it with
       Ctrl+R but it comes with a limitation!
       
       This setup will run fzf for looking a history line with Ctrl+R and will
       run it without allowing you to edit the line! /!\
       
       # Configuration
       
       In your interactive shell configuration file (should be the one set in
       $ENV), add the following function and binding, it will rebind Ctrl+R to
       fzf-histo function that will look into your shell history.
       
       ```
       function fzf-histo {
           RES=$(fzf --tac --no-sort -e < $HISTFILE)
           test -n "$RES" || exit 0
           eval "$RES"
       }
       
       bind -m ^R=fzf-histo^J
       ```
       
       Reload your file or start a new shell, Ctrl+R should now run fzf for a
       more powerful history search.  Don't forget to install fzf package.