#!/bin/bash
#
# Parse the object names out of Nagios' xdata/xodtemplate.h, and
# convert them to their definition format.
#
# Operates on whatever file you give it, like the other utilities.
#

EXIT_USAGE=1
EXIT_INPUT_FILE_DOESNT_EXIST=2
EXIT_OUTPUT_FILE_EXISTS=3

if [ $# -lt 2 ]; then
    echo "Usage: $0 <input_file> <output_file>"
    exit $EXIT_USAGE
fi


INFILE="$1"
OUTFILE="$2"

if [ ! -f "$INFILE" ]; then
    echo "Error: input file $INFILE doesn't exist."
    exit $EXIT_INPUT_FILE_DOESNT_EXIST
fi

if [ -f "$OUTFILE" ]; then
    echo "Error: output file $OUTFILE already exists."
    exit $EXIT_OUTPUT_FILE_EXISTS
fi

# Common options. Color screws up the output.
GREP="grep --extended-regexp --color=never"

# Grep grabs all of the "#define XODTEMPLATE_..." lines, except for
# XODTEMPLATE_NONE, which ain't real.
#
# Sed removes the "XODTEMPLATE_" prefixes, then tr lowercases everything.
#
# Oh and we sort everything, add "define ", and surround each line with
# quotes, because we can get away with it here.
#
$GREP --only-matching '[[:space:]]XODTEMPLATE_[[:alnum:]_]+' "$INFILE" \
    | $GREP -v 'XODTEMPLATE_NONE'                                      \
    | sed 's/ XODTEMPLATE_//g'                                         \
    | tr '[A-Z]' '[a-z]'                                               \
    | sort                                                             \
    | sed -e 's/^/\"define /g' -e 's/$/\"/g' >> "$OUTFILE"