McFly fzf integration

Integrate McFly with fzf to combine a solid command history database with a widely-loved fuzzy search UI

Features:

• Advanced history tracking and prioritization courtesy of McFly
• Rebinds ctrl-r to use an fzf-based interface
  • Supports fzf search syntax
  • Inline layout options
• Toggle options in fzf interface:
  • F1: Sort by time / neural network score
  • F2: Limit to commands run from current directory / any directory
  • F3: Filter by exit status: [Okay (zero) / Fail (non-zero) / Any]

Installation

1. Install mcfly: Included with the mcfly-fzf binaries. Alternatively download mcfly release binary, or view other installation options

2. Install fzf: Download binary, or view other installation options

3. Install mcfly-fzf: Download binary
   Alternatively, install from source:

   cargo install --git https://github.com/bnprks/mcfly-fzf
   

4. Make sure that mcfly, fzf, and mcfly-fzf are all added to your $PATH. Following instructions from McFly:

   For example, you could create a directory at ~/bin, copy mcfly to this location, and add export PATH="$PATH:$HOME/bin" to your .bashrc / .zshrc, or run set -Ua fish_user_paths "$HOME/bin" for fish.

5. Add the following to the end of your ~/.bashrc, ~/.zshrc, or ~/.config/fish/config.fish file:

   Bash:

   eval "$(mcfly init bash)"
   eval "$(mcfly-fzf init bash)"

   Zsh:

   eval "$(mcfly init zsh)"
   eval "$(mcfly-fzf init zsh)"

   Fish:

   mcfly init fish | source
   mcfly-fzf init fish | source

Usage

• Press ctrl-r to open search:
  • Type to search
  • Arrow keys to navigate up/down
  • Enter to select
  • F1/F2/F3 to adjust view settings
• Respects the following environment variables
  • MCFLY_HISTORY_LIMIT
  • MCFLY_RESULTS_SORT
  • FZF_DEFAULT_OPTS, FZF_CTRL_R_OPTS (can include multiple options from man fzf)
• To delete history entries, run mcfly search manually

How it works

Overall:

• mcfly-fzf imports the mcfly crate to access the database.
• A per-session temporary json file stores the search setting toggles within and between searches.

What happens during ctrl-r:

1. mcfly-fzf dump reads the mcfly sqlite database and prints the entry to stdout, where it is piped to fzf
2. Toggling F1/F2/F3 in fzf runs mcfly-fzf toggle, which updates a temporary json file stored at $MCFLY_FZF_OPTS. Then mcfly-fzf dump runs again to re-populate the filtered results for fzf.
3. After selecting a history item, mcfly-fzf select marks the item in the selected_commands table so that the McFly neural network can prioritize frequently-selected items.