#!/usr/bin/env sh

# nixos-config - My current NixOS configuration
#
# Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
# SPDX-License-Identifier: GPL-3.0-or-later
#
# This file is part of my nixos-config.
#
# You should have received a copy of the License along with this program.
# If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.

NAME="git-cgit"

not_empty() {
    arg="$1"
    name="$2"

    if [ "$arg" = "" ]; then
        echo 1>&2 "flag '$name' is empty"
        exit 2
    fi
}

help() {
    cat <<EOF
Create a cgit repo to push the current repo to.

USAGE:
    $NAME [OPTIONS] --git URL..

OPTIONS:
    --help | -h
                            Display this help and exit.
    --git URL
                            git upstream URL.
                            Should be in the form:
                                'ssh://git@<url>/path/to/repo'
    --desc DESC
                            Optional description (will be read from './.git/description' otherwise).
    --defbranch
                            Optional default branch
    --cgit-owner
                            Optional cgit owner
EOF
}

git_url=""
ssh_url=""
url_path=""
desc="$(cat "$(git rev-parse --show-toplevel)/.git/description")"

cgit_owner="$(id --name -u)"
defbranch="$(git branch --show-current)"

while [ "$#" -ne 0 ]; do
    case "$1" in
    "--help" | "-h")
        help
        exit 0
        ;;
    "--git")
        shift 1
        git_url="$1"
        ;;
    "--desc")
        shift 1
        desc="$1"
        ;;
    "--defbranch")
        shift 1
        defbranch="$1"
        ;;
    "--cgit-owner")
        shift 1
        cgit_owner="$1"
        ;;
    esac
    shift 1
done

# In the form git@<url>
ssh_url="${git_url#ssh://}"
while [ "$(dirname "$ssh_url")" != "." ]; do
    ssh_url="$(dirname "$ssh_url")"
done
url_path="${git_url#ssh://"$ssh_url"}"
url_path="${url_path#/}"

not_empty "$git_url" "--git"
not_empty "$ssh_url" "--git <indirectly>"
not_empty "$url_path" "--git <indirectly>"

not_empty "$desc" "--desc"
not_empty "$defbranch" "--defbranch"
not_empty "$cgit_owner" "--cgit-owner"

cat <<EOF
Initializing repo with following values:
    --git -> '$git_url'
    <ssh_url> -> '$ssh_url'
    <url_path> -> '$url_path'

    --desc -> '$desc'
    --defbranch -> '$defbranch'
    --cgit-owner -> '$cgit_owner'

EOF

printf "Continue [y/N]? "
read -r continue
if [ "$continue" != "y" ]; then
    echo 1>&2 "Not continuing.."
    exit 1
fi

set -x

git remote remove origin
git remote add origin "$git_url"

git push --set-upstream origin "$defbranch"

ssh "$ssh_url" -- perms "$url_path" + READERS @all
ssh "$ssh_url" -- desc "$url_path" "$desc"

ssh "$ssh_url" -- config "$url_path" --add cgit.defbranch "$defbranch"
ssh "$ssh_url" -- config "$url_path" --add cgit.owner "$cgit_owner"

ssh "$ssh_url" -- info
# vim: ft=sh