#!/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 "^;*\s+(vim:.*(\s+|:)|vim:(\s*))(ft|filetype)=gitconfig((\s+|:).*|$)" \
  -q "$gitconfig_file" || sed -i'' "1i; $vim_modeline" "$gitconfig_file"