#!/bin/sh

shout() { echo "$0: $@" >&2; }
barf() { shout "fatal: $@"; exit 111; }
safe() { "$@" || barf "cannot $@"; }

safe umask 022
[ -d package ] || barf "no package directory"
[ -d src     ] || barf "no src directory"
[ -d compile ] || barf "no compile directory"

for i in `sed -e '/^it-/!d' -e 's/^it-//' < compile/it=d`
do
  all="$all $i"
done

usage() { shout "usage: package/upgrade [ [-]$all ]"; exit 100; }

targets=""
if [ $# -eq 0 ]
then
  for i in $all
  do
    targets="$all"
  done
else
  if [ "$1" = "-" ]
  then
    shift
    suppress=":"
    for i in ${1+"$@"}
    do
      case "$all " in
	*\ $i\ *)
	  ;;
	*)
	  usage
	  ;;
      esac
      suppress="$suppress$i:"
    done
    for i in $all
    do
      case "$suppress" in
	*:$i:*)
	  ;;
	*)
	  targets="$targets $i"
	  ;;
      esac
    done
  else
    for i in ${1+"$@"}
    do
      case "$all " in
	*\ $i\ *)
	  ;;
	*)
	  usage
	  ;;
      esac
      targets="$targets $i"
    done
  fi
fi

[ "X$targets" = "X" ] && barf "no targets"

version="`head -1 package/version`"
here="`pwd`"
command="`echo $here | sed -e 's/-'$version'$//'`/command"
package="`basename $here | sed -e 's/-'$version'$//'`"
shout "symlink $package -> $package-$version"
safe rm -f $package
safe ln -s $package-$version $package
safe mv -f $package ..

commands=""
for i in $targets
do
  commands="$commands `cat package/commands-$i`"
done

if [ -r package/command-cp ]
then
  for i in `sed -e '/^$/q' < package/command-cp`
  do
    shout "copying commands into $i"
    safe mkdir -p $i
    for j in $commands
    do
      j=${j%:}
      safe rm -f $i/$j'{new}'
      safe cp -p command/$j $i/$j'{new}'
      safe mv -f $i/$j'{new}' $i/$j
    done
  done
fi

if [ -r package/command-ln ]
then
  for i in `sed -e '/^$/q' < package/command-ln`
  do
    safe mkdir -p $i
    for j in $commands
    do
      k=${j%:}
      [ "$j" = "$k:" ] && \
      shout "linking command $k into $i" && \
      safe rm -f $i/$k'{new}' && \
      safe ln -s $command/$k $i/$k'{new}' && \
      safe mv -f $i/$k'{new}' $i/$k
    done
  done
fi

exit 0