import

#!/bin/bash
#
# Copyright (c) 2013, Anton Backer <olegov@gmail.com>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
# FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
# OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.

set -e

die() { echo "$1" >&2; exit 1; }

while :
do
    case $1 in
        --gc)
            gc=1;
            shift
            ;;
        *)
            break
            ;;
    esac
done

find=find
if which gfind >/dev/null; then find=gfind; fi

readlink=readlink
if which greadlink >/dev/null; then readlink=greadlink; fi

src_path="$HOME"/Dropbox/Apps/WorkFlowy
dst_path="$(dirname "$("$readlink" -f "$0")")"
cd "$dst_path" || die "Unable to change directory"

branch=backups
orig_branch="$(git symbolic-ref HEAD | sed s,^refs/heads/,,)"

echo "Checking out the '$branch' branch..."
if git show-ref --verify --quiet refs/heads/"$branch"; then
    git checkout "$branch"
    last_imported="$(git log --format='%ad' --date=short)"
else
    git checkout --orphan "$branch" && git rm -rf .
    last_imported="0000-00-00"
fi

echo "Importing..."
ln "$src_path"/Data/* .
ln "$src_path"/History/* .

echo "Normalizing..."
# At some point files were being backed up with +x
chmod 644 *.txt *.backup
# Make sorting trivial
rename 's/-(\d)\b/-0$1/g' *.txt *.backup  # rename -M?M-D?D to -MM-DD
rename 's/.*\.(\d*-\d*-\d*)(?:\.workflowy)?/$1/' *.txt *.backup  # rename to YYYY-MM-DD.txt or .backup

echo "Committing..."
for f in *-*-*.txt; do
    if [[ ! "${f%.txt}" > "$last_imported" ]]; then
        rm "$f" "${f%.txt}.backup"
        continue
    fi
    mv -f "$f" history.txt
    mv -f "${f%.txt}.backup" data.backup
    git add history.txt data.backup
    # Try to commit if the index actually has changes; ignore otherwise
    git commit --date="${f%.txt}T06:00:00" -m "Backup ${f%.txt}" || true
done

echo "Cleaning up..."
$find \
    -mindepth 1 \
    -not -name data.backup -and \
    -not -name history.txt -and \
    -not -path '*/\.*' \
    -delete
[[ -z "$gc" ]] || git gc --aggressive
git checkout "$orig_branch"