#!/bin/sh
##
## SPDX-FileCopyrightText: 2023 Benjamin Grande M. S. <ben.grande.b@gmail.com>
##
## SPDX-License-Identifier: AGPL-3.0-or-later
##
##
## Git send-email and format-patch does not GPG sign the data.
## This wrapper opens a patch with Vi, skip the first block (where the
## headers hopefully are) and signs the remaining content of the file, which
## is the mail body (cover letter and patch).
##
## == Workflow ==
## Dev Qube:
## $ git format-patch [OPTIONS]
## $ cd /patches/dir/
## $ vim *.patch                  # edit the cover letter
## $ qvm-move *.patch             # move patches to the mail qube
## $ cd -
## Mail Qube:
## $ cd ~/QubesIncoming/dev-qube/
## # take a look at the files
## $ gpg-sign-email *.patch.asc   # sign patches with the mail key
## $ git send-email *.patch.asc

set -eu

if test -z "${1-}"; then
  printf '%s\n' "usage: ${0##*/} [PATCH] [PATCH...]"
  printf '%s\n' "example: ${0##*/} *.patch"
  printf "info: signed files are saved with the suffix '.asc'\n"
  exit 1
fi

vi_cmd="$(has -s vim vi)"
if test -z "$vi_cmd"; then
  printf '%s\n' "Please install 'vi(m)'."
  exit 1
fi

for f in "${@}"; do
  cp "$f" "$f.asc"
  "$vi_cmd" -u NONE \
    -c 'set nomodeline' -c 'norm gg}j' \
    -c '.,$!gpg -a --clear-sign' \
    -c 'wq' -- "$f.asc"
done