changelog-burster

#!/bin/ksh
#
# changelog-burster
#

#
# Utility to take an OpenBSD Changelog from an OpenBSD mirror
# and separate it into a bunch of commit-* files in dated directories
#
# Also slaps the date ranges into the file daterange
#
# It will purge cvs modules not applicable to making plus.html
# (ports and www)
#
# Optionally, it will purge commits that have a date listed in the
# file purgedate. This is to help with an in-progress plus.html
#
# Created 2019-02-05
#

if [ x${PURGE_MODULES} = x ]; then
	PURGE_MODULES="www ports"
fi
if [ x${DATE_FILE} = x ]; then
	DATE_FILE="daterange"
fi
if [ x${PURGEDATE_FILE} = x ]; then
	PURGEDATE_FILE="purgedate"
fi

if [ x${CHANGELOG} = x ]; then
	CHANGELOG="ChangeLog"
fi
if [ x${SPLIT_PREFIX} = x ]; then
	SPLIT_PREFIX="commit-"
fi

# Make sure the changelog exists
if [ ! -f $CHANGELOG ]; then
	echo No such file $CHANGELOG
	exit 1
fi

# Harvest the dates into DATE_FILE
echo -n "Noting dates: "
grep "Changes by:" $CHANGELOG | awk '{ print $4 }' | uniq > $DATE_FILE
echo done

# Split the Changelog into thousands of pieces
# Mwa ha ha ha
echo -n "Wielding chainsaw: "
split -a 3 -p "CVSROOT:	/cvs" $CHANGELOG $SPLIT_PREFIX
echo done

# Get rid of modules not documented in plus.html
echo -n "Purging unworthy modules: "
for module in $PURGE_MODULES;
do
	echo -n "${module} "
	grep -l "Module name:	${module}" ${SPLIT_PREFIX}* | xargs -r rm
done
echo done

# Get rid of modules that are only "sync"
echo -n "Forcing out of sync: "
	grep -l '^sync$' ${SPLIT_PREFIX}* | xargs -r rm
echo done

# Get rid of modules that are only "regen"
echo -n "Applying flame: "
        grep -l '^regen$' ${SPLIT_PREFIX}* | xargs -r rm
echo done

# Remove regress-test-only commits
echo -n "Caution will not save you"
for file in $( grep -l "^	regress/" ${SPLIT_PREFIX}* );
do
	if [ ! $( grep -v regress $file | grep -q "^	.*/.*$" ) ]; then
		rm $file
	fi
done
echo !!!

# Create per-day directory tree for commits
echo -n "Creating directories: "
for day in $( cat $DATE_FILE );
do
	mkdir -p $( echo ${day} | sed 's/\//-/g' )
done
echo done

# Shove commit files in correct directory
echo -n "Filing commits: "
for day in $( cat $DATE_FILE );
do
	daydir=$( echo ${day} | sed 's/\//-/g' )
	grep -l "${day}" ${SPLIT_PREFIX}* | xargs -r -J % mv % ${daydir}/
done
echo done
echo -n "Victims remaining: "
grep CVSROOT 2*/* | wc -l
echo -n "Let's play."
echo