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