#!/bin/bash
# Generates GNU Make recipes for c1map build
#
#   Copyright (C) 2014-2023 Ryan Specialty, LLC.
#
#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
##

set -euo pipefail


# Recursively produce list of dependencies for given package
#
# Since all compilation occurs on the base package in the root of the c1map
# directory, recursive dependencies are output as part of the recipe for the
# base package rather than as dependencies of individual sub-packages.
include-list()
{
  local -r dir="${1?Missing base directory}"
  local -r file="${2?Missing package filename}"

  # get name of all includes, recursively
  grep -o 'lvm:include name="[^"]\+"' "$file" \
    | cut -d\" -f2 \
    | tee >(
      while read dep; do
        include-list "$dir" "$dir/$dep.xml"
      done
    )
}


# Format includes for GNUMakefile recipe
#
# All unique dependencies will be prefixed with the appropriate base path
# and will be output on a single line.
format-includes()
{
  local -r dir="${1?Missing base directory}"

  sort -u \
    | sed "s#^.*\$#$dir/&.xml#" \
    | tr '\n' ' '
}


# Produce recipe for base package
#
# This should only be provided with the filename of a base package (that is,
# an immediate child of c1map).
#
# A recipe will be output for generating a PHP file from the source code
# and all package dependencies, recursively.
c1recipe()
{
  local -r file="${1?Missing source filename}"

  local -r dir=$( dirname "$file" )
  local -r base=$( basename "$file" .xml )

  local -r includes=$(
    include-list "$dir" "$file" \
      | format-includes "$dir" \
  )

  echo "$dir/$base.php: $file $includes"
  echo -e '\t$(TAME) c1map $< $@'
}


# Produce recipe for each provided base package
#
# This should only be provided with filenames of a base package (that is,
# an immediate children of c1map).
main()
{
  while [ $# -gt 0 ]; do
    c1recipe "$1"
    shift
  done
}


main "$@"
