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#!/bin/sh -eu
directory="$XDG_DATA_HOME/bash"
persist="$directory/history"
default="$HOME/.bash_history"
current="$HISTFILE"
_prune() {
sed --in-place '/^#/d' "$1" && # Remove all timestamps.
sed --in-place '/......../!d' "$1" && # Remove all commands 8 characters or less.
sort --unique "$1" | sponge "$1" # Remove all duplicate entries.
}
_migrate() {
[ -f "$default" ] &&
cat "$default" >>"$persist" &&
_prune "$persist" &&
rm "$default"
}
_store() {
cat "$current" >> "$persist" &&
cat "$current" >> "$persist.bak" &&
_prune "$persist" &&
true > "$current"
}
mkdir --parents "$directory"
touch "$current"
_migrate || true
_store
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