#!/bin/bash
# Output absolute import paths for each provided package
#
#   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/>.
#
# All arguments must be paths to the source XML files for a package.  The
# output will be of the form:
#
#   file.xml: /absolute/import/path
#
# Relative paths will be concatenated with the directory name of the source
# file.  Parent references are resolved by replacing "/foo/../bar" with
# "/bar".  Absolute imports are taken as-is.
#
# Namespace prefixes are ignored and the first attribute to the `import'
# node must be `@package', and must appear on the same line.
##

grep -H '<\([a-z]\+:\)\?import \+\(package\|path\)=' "$@" \
  | awk -F': |"' '
      # prefix with filename
      { printf "%s ", $1 }

      # absolute paths should just be echoed
      $3 ~ /^\// { print $3; next }

      # otherwise concatenate import with package directory
      {
        dir  = gensub( /[^/]+.xml/, "", 1, $1 )
        path = "/" dir $3

        # resolve parent references
        while ( path ~ /\/\.\.\// ) {
          sub( /\/[^/]+\/\.\.\//, "/", path )
        }

        print path
      }'