#!/bin/sh

## SPDX-FileCopyrightText: 2023 Benjamin Grande M. S. <ben.grande.b@gmail.com>
##
## SPDX-License-Identifier: AGPL-3.0-or-later

## Setup git client on new machine on a local/separate git configuration.
set -eu

gitconfig_file="${HOME}/.gitconfig.local"
signature_file="${HOME}/.signature"
vim_modeline="vim: ft=gitconfig"

usage(){
  printf '%s\n' "usage: ${0##*/} USER EMAIL SIGNINGKEY" >&2
}

if ! command -v git >/dev/null; then
  printf '%s\n' "Missing dependency: git" >&2
  exit 1
fi

if test -z "${3-}"; then
  usage
  exit 1
fi

user="$1"
email="$2"
signingkey="$3"

set_git_config(){
  git config --file "${gitconfig_file}" "$1" "$2"
}

set_git_config user.name "${user}"
set_git_config user.email "${email}"
set_git_config user.signingKey "${signingkey}"

if test -s "${signature_file}"; then
  set_git_config format.signatureFile "${signature_file}"
else
  set_git_config format.signature "${user}"
fi

grep -E \
  -e "^;*\s+(vim:.*(\s+|:)|vim:(\s*))(ft|filetype)=gitconfig((\s+|:).*|$)" \
  -q -- "${gitconfig_file}" ||
  sed -i'' -e "1i; ${vim_modeline}" -- "${gitconfig_file}"