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#!/usr/bin/env bash
set -o errexit -o nounset -o pipefail
if ! git rev-parse --is-inside-work-tree > /dev/null 2>&1 ; then
echo 'Not inside a Git repository.' >&2
exit 1
fi
if ! git rev-parse HEAD > /dev/null 2>&1 ; then
echo "Where's your HEAD?" >&2
exit 1
fi
has_staged_changes=
git diff --cached --ignore-submodules --quiet || has_staged_changes=1
has_unstaged_changes=
git diff --ignore-submodules --quiet || has_unstaged_changes=1
if [ -z "$has_staged_changes" ] && [ -z "$has_unstaged_changes" ]; then
echo 'No staged or unstaged changes, seemingly?' >&2
exit 1
fi
add=-a
[ -n "$has_staged_changes" ] && add=
numof_parents="$( git rev-list --parents -n 1 HEAD | wc --words )"
if [ "$numof_parents" -eq 1 ]; then
dest_ref=--root
elif [ "$numof_parents" -eq 2 ]; then
dest_ref='HEAD^^'
else
echo 'Sure you want to fixup a merge commit?' >&2
exit 1
fi
git commit $add --fixup=HEAD
stash=
[ -n "$has_staged_changes" ] && [ -n "$has_unstaged_changes" ] && stash=1
unstash() {
git stash pop --quiet
}
if [ -n "$stash" ]; then
git stash push --quiet
trap unstash EXIT
fi
GIT_EDITOR=true git rebase -i --autosquash "$dest_ref"
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