utils/parse_macros

   1 #!/bin/bash
   2 #
   3 # Parse the macro names out of Nagios' include/macros.h.
   4 #
   5 # Operates on whatever file you give it. That should probably be
   6 # include/macros.h. Just sayin'.
   7 #
   8
   9 EXIT_USAGE=1
  10 EXIT_INPUT_FILE_DOESNT_EXIST=2
  11 EXIT_OUTPUT_FILE_EXISTS=3
  12 EXIT_TEMP_FILE_EXISTS=4
  13
  14 if [ $# -lt 2 ]; then
  15     echo "Usage: $0 <input_file> <output_file>"
  16     exit $EXIT_USAGE
  17 fi
  18
  19
  20 INFILE="$1"
  21 OUTFILE="$2"
  22 TEMPFILE="${OUTFILE}.tmp"
  23
  24 if [ ! -f "$INFILE" ]; then
  25     echo "Error: input file $INFILE doesn't exist."
  26     exit $EXIT_INPUT_FILE_DOESNT_EXIST
  27 fi
  28
  29 if [ -f "$OUTFILE" ]; then
  30     echo "Error: output file $OUTFILE already exists."
  31     exit $EXIT_OUTPUT_FILE_EXISTS
  32 fi
  33
  34 if [ -f "$TEMPFILE" ]; then
  35     echo "Error: temporary file $TEMPFILE already exists."
  36     exit $EXIT_TEMP_FILE_EXISTS
  37 fi
  38
  39 # Common options. Color screws up the output.
  40 GREP="grep --extended-regexp --color=never"
  41
  42 # Grep grabs all of the "#define MACRO..." lines, except for
  43 # MACRO_X_COUNT and MACRO_ENV_VAR_PREFIX which aren't real macros.
  44 # Sed just removes the "MACRO_" prefixes.
  45 $GREP --only-matching '[[:space:]]MACRO_[[:alnum:]_]+' "$INFILE" \
  46     | $GREP -v 'MACRO_X_COUNT'                                   \
  47     | $GREP -v 'MACRO_ENV_VAR_PREFIX'                            \
  48     | sed 's/ MACRO_//g' >> "$OUTFILE"
  49
  50 # We need to include ARG1, ARG2... ARG<max>,
  51 # where the maximum is defined in macros.h.
  52 MAXARG=`$GREP 'MAX_COMMAND_ARGUMENTS' "$INFILE" \
  53         | $GREP --only-matching '[[:digit:]]+'`
  54
  55 for argnum in `seq 1 $MAXARG`; do
  56     echo "ARG${argnum}" >> "$OUTFILE"
  57 done
  58
  59 # And, the USER1, USER2... USER<max> macros.
  60 # Same as above.
  61 MAXUSER=`$GREP 'MAX_USER_MACROS' "$INFILE" \
  62          | $GREP --only-matching '[[:digit:]]+'`
  63
  64 for argnum in `seq 1 $MAXUSER`; do
  65     echo "USER${argnum}" >> "$OUTFILE"
  66 done
  67
  68 # Now, we sort the thing.
  69 sort "$OUTFILE" > "$TEMPFILE"
  70
  71 # Add quotes and '\\$' before and after each macro. This just
  72 # makes it easy to cut-and-pase into nagios-mode.el.
  73 sed -e 's/^/\"\\\\\$/g' -e 's/$/\\\\\$\"/g' "$TEMPFILE" > "$OUTFILE"
  74 rm "$TEMPFILE"