src/etc/newsyntax38

   1 #! /bin/sh
   2 #
   3 # newsyntax38 -- update a screenrc file from 3.3 to 3.8 syntax
   4 #
   5 # Please bring your scripts up to syntax level 3.3 before running this script.
   6 # Please check all comments after running this script and watch out
   7 # for funny passages.
   8 #
   9 # * aka and shellaka are replaced by title and shelltitle.
  10 #
  11 # * Pairs of termcap and terminfo commands are folded into a single
  12 #   termcapinfo command where possible.
  13 #
  14 # * trailing blanks are zapped. Unintentionally.
  15 #
  16 # 12.10.95, jnweiger, use at your own risk.
  17 #
  18 if [ $# != 1 ]; then
  19   echo "usage $0 screenrcfile"
  20   echo ""
  21   echo "The named file will be updated in place to the syntax of screen 3.8"
  22   echo "A backup copy will be written to <screenrcfile>.bak"
  23   exit 1;
  24 fi
  25
  26 #Ultrix 4.2 /bin/sh does not handle "read a < $1"
  27 #Dean Gaudet <dgaudet@watdragon.uwaterloo.ca>
  28 exec < $1
  29 read a
  30
  31 if [ "$a" = "#3.8" ]; then
  32   echo "$1 already updated"
  33   exit 0
  34 fi
  35
  36 rm -f $1.old $1.dups
  37
  38 cp $1 $1.old
  39 echo "#3.8" > $1
  40 echo "# Do not remove the above line. This screen rc file was updated" >> $1
  41 echo "# by the newsyntax script." >> $1
  42
  43 # termcap and terminfo lines can only be folded when there is no parameter
  44 # expansion in the codes. Parameters are denoted differently in
  45 # termcap and termcap syntax. Everything else is identical, I assume.
  46 # Thus codes not containing '%' can be savely folded.
  47
  48 sed < $1.old > $1.dups \
  49 -e 's/^\([       #]*\)aka/\1title/' \
  50 -e 's/^\([       #]*\)shellaka/\1shelltitle/' \
  51 -e 's/^\([       #]*\)termcap[   ][      ]*\([^%]*$\)/\1termcapinfo \2/' \
  52 -e 's/^\([       #]*\)terminfo[  ][      ]*\([^%]*$\)/\1termcapinfo \2/' \
  53 -e 's/\\/\\\\/g'
  54
  55 # Oh, my bourne shell seems to gobble backslashes while reading.
  56 # Thus the sed above duplicates them in advance.
  57 # Hope this is not just another silly bash featureism.
  58 # It still zaps trailing blanks. I do not know why. But that is nice.
  59
  60 exec < $1.dups
  61 while read a ; do
  62   if [ "$a" = "$b" ]; then
  63     case "$a" in
  64       *termcapinfo*) continue ;;
  65     esac
  66   fi
  67   echo "$a" >> $1
  68   b="$a"
  69 done
  70
  71 rm -f $1.dups