Fuzzy finder integrated history search

history_search.fish

function history_search
    set -l fuzzy_cmd
    if type -q sk
        set fuzzy_cmd sk
    else if type -q fzf
        set fuzzy_cmd fzf
    else
        echo "Error: Neither skim nor fzf is installed"
        return 1
    end

    # Height of the found results in relative percentage -- using 50 as a default
    set -l results_height 50

    # Get current time for clever delta calculations
    set -l now (date +%s)

    set -l fish_history_file $XDG_DATA_HOME/fish/fish_history

    # Create a temporary array to hold formatted history entries (Thanks fish!)
    set -l formatted_history

    # Declaring here
    set -l cmd ""
    set -l timestamp ""

    for line in (cat $fish_history_file)
        if string match -r '^- cmd: ' -- "$line" >/dev/null
            set cmd (string sub -s 8 -- "$line")
        else if string match -r '^  when: ' -- "$line" >/dev/null
            # Timestamp for the current command
            set timestamp (string sub -s 9 -- "$line")

            if test -n "$cmd" -a -n "$timestamp"
                set -l delta (math "$now - $timestamp")
                set -l delta_days (math "floor($delta / 86400)")

                set -l time_display
                if test $delta -lt 0
                    set time_display "+".(-1 \* $delta_days)"d"
                else if test $delta_days -lt 1 -a $delta -lt 72000
                    set time_display (date -r $timestamp "+%H:%M")
                else if test $delta_days -eq 0
                    set time_display 1d
                else
                    set time_display "$delta_days"d
                end

                set -a formatted_history " $time_display | $cmd"

                # Reset for next entry
                set cmd ""
                set timestamp ""
            end
        end
    end

    set -l selected (printf "%s\n" $formatted_history | $fuzzy_cmd --height $results_height% --reverse --with-nth 2.. --query=(commandline))

    if test -n "$selected"
        # Extract just the command part (remove the time prefix)
        set -l cmd_parts (string split --max 1 "|" $selected)
        if test (count $cmd_parts) -gt 1
            commandline $cmd_parts[2]
        else
            commandline $selected
        end
    end

    commandline $selected

    commandline -f repaint
end