got/got-checkout at main · haidara02/got · GitHub

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#!/bin/dash

if [ ! -d ".got" ]
then
    echo "$0: error: got repository directory .got not found" 1>&2
    exit 1
fi

usage_error() {
    echo "usage: $0 <branch>" 1>&2
    exit 1
}

p=$(find ".got/commits/" -type d -name ".commit.*" -printf "%f\n" | sort | tail -1 | grep -Eo ".$")
if [ -z "$p" ]
then
    echo "$0: error: this command can not be run until after the first commit" 1>&2
    exit 1
fi

if [ "$#" != 1 ]
then
    usage_error
fi

if echo "$1" | grep -Eq "^-"
then
    usage_error
elif [ ! -d ".got/branches/$1" ]
then
    echo "$0: error: unknown branch '$1'" 1>&2
    exit 1
fi

current_branch=$(cat .got/HEAD)
if [ "$current_branch" = "$1" ]
then
    echo "Already on '$1'"
    exit 0
fi

# previous commit of current branch
p_current=$(tail -1 ".got/log" | cut -d' ' -f1)
# previous commit of requested branch
p_next=$(tail -1 ".got/branches/$1/log" | cut -d' ' -f1)

overwritten=$(diff -qr ".got/index" ".got/commits/.commit.$p_current" | grep -E "differ" | sed -E "s/.*\/([^\/]*) .*$/\1/g")
for file in ".got/commits/.commit.$p_next"/*
do
    file=$(basename "$file")
    if [ -f ".got/commits/.commit.$p_current/$file" ] && [ -f "$file" ]
    then
        if ! diff "$file" ".got/commits/.commit.$p_current/$file" > /dev/null
        then
            overwritten="$overwritten\n$file"
        fi
    elif [ -f "$file" ]
    then
        overwritten="$overwritten\n$file"
    fi
done

if [ "$p_current" = "$p_next" ]
then
    :
elif [ -n "$overwritten" ]
then
    echo "$0: error: Your changes to the following files would be overwritten by checkout:" 1>&2
    echo "$overwritten" | sort -u | grep -v "^$"
    exit 1
else
    for file in ".got/commits/.commit.$p_current"/*
    do
        file=$(basename "$file")
        if [ "$file" = "*" ]
        then
            continue
        elif [ ! -f ".got/commits/.commit.$p_next/$file" ]
        then
            rm -f "$file" || exit 1
            rm -f ".got/index/$file" || exit 1
        fi
    done
    cp -r ".got/commits/.commit.$p_next"/* "."
    cp -r ".got/commits/.commit.$p_next"/* ".got/index/"
fi
echo "$1" > ".got/HEAD"
# backup current branch's logs
cp ".got/log" ".got/branches/$current_branch/log" || exit 1
cp ".got/branches/$1/log" ".got/log" || exit 1
echo "Switched to branch '$1'"
exit 0