#!@SH@
#-*-mode:  sh -*-

# Copyright (c) 2007-2008 Aleksey Cheusov <vle@gmx.net>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

set -e

. pipestatus

############################################################
# user settable variables
if test -z "$PKGSRCDIR"; then
    PKGSRCDIR=/usr/pkgsrc
fi

if test -z "$BMAKE"; then
    BMAKE=make
fi

############################################################
usage (){
    cat 1>&2 <<EOF
pkg_update_src_summary - incrementally updates
package summary from pkgsrc/ tree (pkg_summary(5) format)

usage: pkg_update_src_summary [OPTIONS] summary_file
OPTIONS:
  -h|--help              display this help message
  -f|--file <filename>   obtain package names from
                         a specified file, - for stdin
  -i|--fields <filename>
  -i|--fields=<filename> list of fields (separated by space character
                         or comma) to be included to the summary,
                         full summary is generated by default
EOF
}

pkgs_fn=''

while test $# -ne 0; do
    case "$1" in
	-h|--help)
	    usage
	    exit 0;;
	-f|--file)
	    pkgs_fn="$2"
	    shift;;
	--file=*|-f=*)
	    pkgs_fn="`printf '%s\n' \"$1\" | sed 's,^[^=]*=,,'`";;
	-f*)
	    pkgs_fn="`printf '%s\n' \"$1\" | cut -b3-`";;
	-i|--fields)
	    fields="-f '$2'"
	    shift;;
	-i=*|--fields=*)
	    fields="-f '`echo $1 | cut -f2 -d=`'";;
	--)
	    shift
	    break;;
	-*)
	    echo "Bad option $1" 1>&2
	    exit 1;;
	*)
	    break
    esac
    shift
done

if test $# -ne 1; then
    usage
    exit 1
fi

summary=$1
shift

############################################################
cd $PKGSRCDIR

new_summary=$summary.new

tmp_dir="/tmp/pkg_update_src_summary.$$"
trap "rm -rf $tmp_dir $new_summary" 0 1 2 15
mkdir -m 700 "$tmp_dir"

allpkgs_fn=$tmp_dir/allpkgs

if test "$pkgs_fn"; then
    awk '{sub(/#.*/, "")} NF > 0 {print $1}' $pkgs_fn > $allpkgs_fn
else
    pkg_list_all_pkgs > $allpkgs_fn
fi

############################################################
#### process packages

# src_summary from scratch
if ! test -f $summary; then
    eval pkg_src_summary $fields < $allpkgs_fn > $new_summary
    mv $new_summary $summary
    exit $?
fi

# micro summary
micsum_fn=$tmp_dir/micsum
pkg_micro_src_summary < $allpkgs_fn >$micsum_fn

# summary against microsummary
cmp_fn=$tmp_dir/cmp
pkg_cmp_summary -p $summary $micsum_fn > $cmp_fn

# copying summary about unchanged packages
eq_pkgs_fn=$tmp_dir/eqpkgs
awk '$1 ~ /^[=]/ {print $2 ":" $3}' $cmp_fn > $eq_pkgs_fn # pkgpath:pkgbase

copy_eq_pkgs (){
env eq_pkgs_fn="$eq_pkgs_fn" runawk -e '
#use "xgetline.awk"
#use "pkg_grep_summary.awk"

BEGIN {
   eq_pkgs_fn = ENVIRON ["eq_pkgs_fn"]

   FS = " "
   while (xgetline0(eq_pkgs_fn)){
      eq_pkgs [$1] = 1
   }

   FS = "="
}

function grep_summary__condition (           pkgpath, pkgbase){
   pkgpath = grep_summary__fields ["PKGPATH"]
   pkgbase = grep_summary__fields ["PKGNAME"]
   sub(/-[^-]+$/, "", pkgbase)

   if (pkgpath == "" || pkgbase == ""){
      return -1
   }

   if (((pkgpath ":" pkgbase) in eq_pkgs) &&
      !((pkgpath ":" pkgbase) in processed))
   {
      processed [pkgpath ":" pkgbase] = 1
      return 1
   }

   return 0
}
' "$@"
}

copy_eq_pkgs $summary > $new_summary

# add new/updated/changed packages
changed_pkgs_fn=$tmp_dir/changed_pkgs
awk '$1 ~ /^[+<>?0-9]/ {print $2 ":" $3}' $cmp_fn > $changed_pkgs_fn

extract_pkgpath (){
awk -v changed_pkgs_fn=$changed_pkgs_fn '
BEGIN {
   while (0 < (ret = getline < changed_pkgs_fn)){
      pkgs [$1] = 1
   }

   if (ret < 0){
      printf "reading error from" changed_pkgs_fn > "/dev/stderr"
   }

   SUBSEP = ":"
   FS     = "="
}

$1 == "PKGNAME" {
   pkgbase = $2
   sub(/-[^-]+$/, "", pkgbase)
}

$1 == "PKGPATH" {
   pkgpath = $2
}

pkgpath != "" && pkgbase != "" {
   interesting = ((pkgpath ":" pkgbase) in pkgs)
}

NF == 0 && interesting {
   print pkgpath
   pkgbase = pkgpath = ""
}
' "$@"
}

pkgpath_fn=$tmp_dir/pkgpaths
extract_pkgpath $micsum_fn > $pkgpath_fn

eval pkg_src_summary $fields < $pkgpath_fn >> $new_summary

# result
mv $new_summary $summary