#!/bin/ksh93

#
# merge Rauchs Subversion tree into our git,
# one patch at the time
#

set -o xtrace
set -o errexit
set -o pipefail

which bunzip2	|| exit 1
which git	|| exit 1
which realpath	|| exit 1
which svn	|| exit 1
which svnadmin	|| exit 1
which svnrdump	|| exit 1


builtin chmod	|| exit 1
builtin mkdir	|| exit 1
builtin printf	|| exit 1
#builtin rm	|| exit 1 # broken Debian ksh93 package config, grrr...
builtin wc	|| exit 1


# clean data from previous run
rm -Rf gitsvnclone1 svnstore


# squish locale settings, we need the POSIX defaults
if [[ "${!LC_*}" != '' ]] ; then
	unset "${!LC_@}"
fi
unset LANG
export LANG='POSIX'
 
typeset -r infile='rauch_svndump20200128.svndump.bz2'

compound svninfo

[[ ! -f "${infile}" ]] && exit 1
[[ ! -r "${infile}" ]] && exit 1

# create empty SVN repository
svnadmin create svnstore
# add dummy hook to allow property changes for "svnrdump load"
printf '#!/bin/sh\nexit 0\n' >'svnstore/hooks/pre-revprop-change'
chmod a+x 'svnstore/hooks/pre-revprop-change'

bunzip2 -c <"${infile}" | svnrdump load "file://$PWD/svnstore/"

# get HEAD revision (number) from svn repository
integer svninfo.revision
svninfo.cmdout="$(svn info "file://$PWD/svnstore")"
dummy="${svninfo.cmdout/~(E)Revision:[[:space:]]+([[:digit:]]+)/ }"
(( svninfo.revision=.sh.match[1] ))

printf '# Subversion info:\n'
print -v svninfo

mkdir 'gitsvnclone1'
cd 'gitsvnclone1'
git svn clone "file://$(realpath "$PWD/../svnstore")"

ls -lad 'svnstore/trunk/projekt/ptxdist/'


cd 'svnstore/trunk/projekt/ptxdist/'
git format-patch -$((svninfo.revision+1))

# remove patch files which are empty
(for i in *.patch ; do if [[ ! -s "$i" ]] ; then rm -- "$i" ; fi ; done)

# list remaining patches
patchlist="$(ls -1 -- *.patch)"
printf '## Patches:\n%s\n# Number of patches: %d\n' "${patchlist}" "$(wc -l <<<"$patchlist")"

printf '# DONE!\n'
# EOF.