#!/usr/bin/env bash

#
# Loads an SVN snapshot into a new repository.
#

if which tput >/dev/null 2>&1; then
    ncolors=$(tput colors)
fi
if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
    RED="$(tput setaf 1)"
    GREEN="$(tput setaf 2)"
    YELLOW="$(tput setaf 3)"
    BLUE="$(tput setaf 4)"
    MAGENTA="$(tput setaf 5)"
    CYAN="$(tput setaf 6)"
    BOLD="$(tput bold)"
    NORMAL="$(tput sgr0)"
else
    RED=""
    GREEN=""
    YELLOW=""
    BLUE=""
    MAGENTA=""
    CYAN=""
    BOLD=""
    NORMAL=""
fi

error() {
    printf "${BOLD}${RED}$1${NORMAL}\n"
}

set -e

backup_path="$1"
repo_path="$2"

if [[ ($backup_path == "") || ($repo_path == "") ]]; then
    error "Missing args: <backup file path> <svn repo path>"
    exit 1
fi

if [[ ! -f "$backup_path" ]]; then
    error "Backup file '$backup_path' doesn't exist.\n"
    exit 1
fi

if [[ ! -d "$repo_path" ]]; then
    error "SVN repo '$repo_path' doesn't exist.\n"
    exit 1
fi

printf "${BOLD}${YELLOW}Loading backup '$backup_path' to '$repo_path'\n"
printf "The destination repo should be a new repo with no commits.\n"
printf "Proceed? (1|y)\n> ${NORMAL}"

read -e proceed
if [[ ! ($proceed == "1" || $proceed == "y") ]]; then
    exit 1
fi

# Was having trouble getting this to work on svnadmin 1.14.1 on Windows:
#   gunzip -c "$backup_path" | svnadmin load "$repo_path"
# It was very slow and the output would freeze.
# So now we unzip and then import.
source_dir=$(dirname "$backup_path")
dump_file="$source_dir/$RANDOM.dump"
printf "${BOLD}Unzipping to '$dump_file'\n"
gunzip -cf "$backup_path" >> "$dump_file"
printf "${BOLD}Loading into SVN repo\n"
svnadmin load -F "$dump_file" "$repo_path"
rm "$dump_file"