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#!/usr/bin/env bash
# Recursively dump all blobs in the subtree identified by ID.
set -o pipefail
usage() {
cat <<EOF
Usage: cat-git-tree [--git-dir DIR] ID
EOF
}
cat-item()
{
local hash="$1"
local type="$2"
case "$type" in
blob)
git cat-file blob "$hash" || exit $?
;;
tree)
local tree=$(git ls-tree "$hash") || exit $?
while read -r line; do
local sub_type=$(echo "$line" | cut -d' ' -f 2) || exit $?
local sub_hash=$(echo "$line" | cut -d' ' -f 3) || exit $?
sub_hash=$(echo "$sub_hash" | cut -d' ' -f 1) || exit $?
cat-item "$sub_hash" "$sub_type"
done <<< "$tree"
;;
*)
echo "Unexpected item: $type $hash" 1>&2
exit 1
;;
esac
}
case $# in
1) ;;
3)
if test "$1" != --git-dir; then
usage 1>&2
exit 1
fi
export GIT_DIR="$2"
shift 2
;;
*)
usage 1>&2
exit 1
;;
esac
top="$1"
type=$(git cat-file -t "$top") || exit $?
cat-item "$top" "$type"
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