#! /bin/bash
 

 function check-for-header()
 {

   for n in Summary Name Version Release License Group Vendor Distribution ; do

     grep -e "^$n:" $1 > /dev/null
     if [ $? -ne 0 ] ; then
       echo "ERROR in $1: $n: must present in the header"
       exit 1
     fi
   done
 }
 

 # Dist tag must present in Release:
 function check-for-dist-tag()
 {
   cat $1 | grep "Release:" | grep "%{?dist}" > /dev/null
   if [ "$?" -ne 0 ];then
     echo "ERROR in $1: Release field doesn't contain %{?dist} tag"
     cat $1 | grep "Release:"
     exit 1
   fi
 }
 
 # Check for Version-Release matching top entry from the Changelog
 function check-for-correct-version()
 {
   versions=`sed -e '1,/%changelog/d' $1 | grep '<' | grep '>' | grep '*' | cut -f 2 -d '>'`;
   latest_version_in_changelog=`echo $versions | cut -d ' ' -f 1`
   version=`cat $1 | grep Version: | cut -f 2 -d ':'  | sed 's/ //g'  | sed '1!d'`;
   sub_version=`cat $1 | grep Release: | cut -f 2 -d ':' | cut -f 1 -d '%' | sed 's/ //g' | tr -d ' '`
   s=`echo ${sub_version//[[:blank:]]/}`
   v=`echo ${version//[[:blank:]]/}`
   full_version=${v}-${s};
   if [ "${latest_version_in_changelog}" != "${full_version}" ]; then
     echo "ERROR in $1: Top changelog entry version ${latest_version_in_changelog} does NOT MATCH package version ${full_version}"
     echo "Please update %changelog or Version,Release: in $1 to make them match each other"
     exit 1
   fi
 }
 

 # Changelog should have:
 # - correct day of week for the date
 # - descending chronological order

 # - whitespaces are ignored while validating dates

 function check-for-bogus-dates()
 {

   local prev_epoch_seconds=$(date +%s)
   local D=''
   local m=''
   local d=''
   local y=''
   local epoch_seconds=''
   

   sed -e '1,/%changelog/d' "$1" | grep '^\*' | awk '{printf "%s %s %02d %04d\n", $2, $3, $4, $5}' | \

   while read D m d y
   do
     day=$(date --date="$m $d $y" '+%a')

     if [ "${D}" != "${day}" ]; then

       echo "ERROR in $1: bogus date $m $d $y found - actual day is $day, but found $D"

       exit 1
     fi

     epoch_seconds=$(date --date "$m $d $y" +%s)

     if [ $prev_epoch_seconds -lt $epoch_seconds ]; then
       echo "ERROR in $1: %changelog not in descending chronological order"

       echo "Date validation failed at $D $m $d $y"

       exit 1
     fi
     prev_epoch_seconds=$epoch_seconds

   done
 }
 
 # No trailing spaces
 function check-for-trailing-spaces()
 {
   grep -e " $" $1
   if [ $? -eq 0 ] ; then

     echo "ERROR in $1: trailing spaces detected"
     exit 1

   fi
 }
 

 # Use %configure instead of ./configure
 # De not redefine standard paths parameters

 function check-for-configure()
 {
   grep -e "./configure" $1
   if [ $? -eq 0 ] ; then

     echo "ERROR in $1: use %configure instead of ./configure"
     exit 1

   fi

 
   for param in prefix exec-prefix bindir sbindir libdir includedir sysconfdir datadir libexecdir sharedstatedir mandir infodir localstatedir; do
     grep -e "\(configure\|^\)[ \t]\+--$param=%{_$param}" $1
     if [ $? -eq 0 ] ; then
       echo "ERROR in $1: --$param can be ommited when using %configure"
       exit 1
     fi
   done

 }
 
 # All BuildRequires should on the top
 function check-for-buildrequires()
 {
   sed -e '1,/%description/d' $1 | grep -e "^BuildRequires"
   if [ $? -eq 0 ] ; then

     echo "ERROR in $1: BuildRequires in subpackages detected."
     echo "Move all BuildRequires to the top"
     exit 1

   fi
 }
 
 SPECS=`git diff --name-only $1 @ | grep -e "SPECS/.*.spec$"`
 for i in `echo $SPECS`;
 do
   echo Analyzing $i ...
   if [ ! -f $i ]; then
      echo "$i is removed by the current changeset."
   else

     check-for-header $i

     check-for-dist-tag $i
     check-for-correct-version $i
     check-for-bogus-dates $i
     check-for-trailing-spaces $i
     check-for-configure $i
     check-for-buildrequires $i
   fi
 done