#!/bin/bash

# This file is maintained at http://git.mdcc.cx/caspar

# casparize - create Makefile-populated directories
# Copyright (C) 2009  Jeroen Hoppenbrouwers <hoppie@hoppie.nl>
#
#    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/>.
#
# Creates a directory in working directory named like the last path
# element of the parameter, and creates a Makefile in the new directory
# containing standard caspar(7) setup that refers to the parameter path.
# If relevant, also copies the original config file into the new dir.
# Is reasonably picky about path names, tries to avoid common errors.
#
# V1.3 2009-07-25

# Abort on first error.
set -e

if [ -z "$1" ]; then
  echo "Usage:"
  echo "  casparize /path/to/config/dir"
  echo "    Creates dir in working directory and"
  echo "    sets up caspar(7) Makefile in it."
  echo "  casparize /path/to/config/dir/file"
  echo "    Creates dir in working directory and"
  echo "    sets up caspar(7) Makefile in it,"
  echo "    then copies the config file into it."
  echo ""
  echo "Typical example:"
  echo "  \$ cd <svn>/etc"
  echo "  \$ casparize /etc/postfix/main.cf"
  echo ""
  echo "Will never overwrite anything that already exists."
  exit 1
fi

# Complain if config path is not absolute.
if [ "${1:0:1}" != "/" ]; then
  echo "ERROR: config path must be absolute".
  exit 1
fi

# If given config path is a file, split it off and continue with just the
# config directory (until at the end where the file comes in).
if [ -d "$1" ]; then
  # Target is a directory; just continue.
  conffile=""
  confdir=$1
else
  # Target is a file; split off.
  conffile=`basename $1`
  confdir=`dirname $1`
fi

# Two options are covered:
# 1. New directory required, create in working directory.
# 2. New dir and file required, create dir in working directory and file
#    in the newly created directory.
# What is NOT covered is "create file in working directory" because we
# assume that it is rare to not have the working directory set up with a
# Makefile. But it could be done.

# Complain if working directory basename is not equal to one-but-last
# element of the given config directory path. This catches most "oops"
# cases.
here=`pwd`
here=`basename $here`
target=`dirname $confdir`
target=`basename $target`
if [ "$here" != "$target" ]; then
  echo "ERROR: Check config directory versus working directory."
  exit 1
fi

# Find the include/install.mk file by looking up the tree from working dir.
scandir=`pwd`
uplevels=""
until [ -a "${uplevels}include/install.mk" ]; do
  scandir=`dirname $scandir`
  if [ "$scandir" = "/" ]; then
    echo "ERROR: could not find include/install.mk anywhere up the path."
    exit 1
  fi
  uplevels+="../"
done

# Directory to be created in working directory.
base=`basename $confdir`

# If the directory to be created already exists, don't complain.
# It may be that caspar(1) is used to create the Makefile only.
mkdir -pv $base

if [ -e "${base}/Makefile" ]; then
  # Complain if the Makefile already exists.
  echo "WARNING: $base/Makefile already exists; not overwriting."
else
  # Create the Makefile.
  echo "csp_DIR = $confdir" > ${base}/Makefile
  echo "include ${uplevels}../include/install.mk" >> ${base}/Makefile
  echo "casparize: created file \`$base/Makefile'"
fi

# If required, create the configuration file as well (copy over).
if [ -n "${conffile}" ]; then
  if [ -e "${base}/${conffile}" ]; then
    echo "WARNING: ${base}/${conffile} already exists; not overwriting."
  else
    cp ${confdir}/${conffile} $base
    echo "casparize: created file \`${base}/${conffile}'"
  fi
fi

exit 0