src/regex/splice.sh

   1 #!/bin/sh
   2 #############################################################################
   3 # Name:        splice
   4 # Purpose:     Splice a marked section of regcustom.h into regex.h
   5 # Author:      Mike Wetherell
   6 # RCS-ID:      $Id$
   7 # Copyright:   (c) 2004 Mike Wetherell
   8 # Licence:     wxWindows licence
   9 #############################################################################
  10
  11 #
  12 # Works by greping for the marks then passing their line numbers to sed. Which
  13 # is slighly the long way round, but allows some error checking.
  14 #
  15
  16 SRC=regcustom.h
  17 DST=regex.h
  18 MARK1='^/\* --- begin --- \*/$'
  19 MARK2='^/\* --- end --- \*/$'
  20 PROG=`basename $0`
  21 TMP=$DST.tmp
  22
  23 # findline(pattern, file)
  24 # Prints the line number of the 1st line matching the pattern in the file
  25 #
  26 findline() {
  27     if ! LINE=`grep -n -- "$1" "$2"`; then
  28         echo "$PROG: marker '$1' not found in '$2'" >&2
  29         return 1
  30     fi
  31     echo $LINE | sed -n '1s/[^0-9].*//p'    # take just the line number
  32 }
  33
  34 # findmarkers([out] line1, [out] line2, pattern1, pattern2, file)
  35 # Returns (via the variables named in the 1st two parameters) the line
  36 # numbers of the lines matching the patterns in file. Checks pattern1 comes
  37 # before pattern2.
  38 #
  39 findmarkers() {
  40     if ! LINE1=`findline "$3" "$5"` || ! LINE2=`findline "$4" "$5"`; then
  41         return 1
  42     fi
  43     if [ $LINE1 -ge $LINE2 ]; then
  44         echo "$PROG: marker '$3' not before '$4' in '$5'" >&2
  45         return 1
  46     fi
  47     eval $1=$LINE1
  48     eval $2=$LINE2
  49 }
  50
  51 # find markers
  52 #
  53 if findmarkers SRCLINE1 SRCLINE2 "$MARK1" "$MARK2" $SRC &&
  54    findmarkers DSTLINE1 DSTLINE2 "$MARK1" "$MARK2" $DST
  55 then
  56     # do splice
  57     #
  58     if (sed $DSTLINE1,\$d $DST &&
  59         sed -n $SRCLINE1,${SRCLINE2}p $SRC &&
  60         sed 1,${DSTLINE2}d $DST) > $TMP
  61     then
  62         mv $TMP $DST
  63         exit 0
  64     else
  65         rm $TMP
  66     fi
  67 fi
  68
  69 exit 1