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mcfly-fzf
Integrate Mcfly with fzf to combine a solid command history database with a widely-loved fuzzy search UI
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It is a custom pretrained NN with very few nodes, the full source code is here: https://github.com/cantino/mcfly/blob/master/src/network.rs
I believe McFly hangs on to all history in the database, though you can limit the UI to only return the most recent entries (MCFLY_HISTORY_LIMIT).
One side note -- I made a small tool to integrate the McFly database with the fzf UI, which might be of interest to you [1]. Overall I've been a happy user of McFly for a few years, and it's 100% an upgrade over bash's command history (properly storing commands from multiple terminal windows; collecting working directory + exit status info, etc.)
[1] https://github.com/bnprks/mcfly-fzf
How does this differ from https://github.com/zsh-users/zsh-history-substring-search ? Except that yours seems to be built-in and zsh-history-substring-search is ~800 lines of zsh