filters

#! /bin/sh

# Postprocessing of the git conversion.

rm -rf gcc-git.git
git clone -l --mirror gcc-git
cd gcc-git.git

# We branchified all the subdirectories of branches/st, but we still
# want to put its README in a branch.
git branch st/README root
git filter-branch --subdirectory-filter branches/st st/README

# Everything else in 'root' is useless, either accidental branch
# creation/deletion or ignore twiddling.
git branch -D root

# Recreate branches that reposurgeon discarded.
for f in $(git tag|grep -- '-root$'); do
    ob=${f%-root}
    if ! git show-ref --verify -q refs/heads/$ob; then
	git branch $ob $f &&
	    git tag -d $f
    fi
done
# Discard the other -root tags.
git tag | grep -- '-root$' | xargs git tag -d

# Perform branch/tag deletes.
for f in $(git tag|grep ^tipdelete-); do
    ob=${f#tipdelete-}
    refs=( $(git show-ref $ob|cut -d ' ' -f 2) )
    # Make sure the name is unambiguous.
    if [ ${#refs[@]} = 1 ]; then
	ref=${refs[0]}
	case $ref in
	    refs/heads/*)
		git branch -D $ob && git tag -d $f ;;
	    refs/tags/*)
		git tag -d $ob && git tag -d $f ;;
	esac
    fi
done
# Handle the ambiguous ref deletes.
for f in improved-aliasing-branch gomp-20050608-branch functionspecific-branch; do
    git branch -D $f
    git tag -d tipdelete-$f
done
git tag -d functionspecific-branch tipdelete-functionspecific-branch.1

# Delete emptycommit tags for merge and mime-type properties, directory
# add/delete, and no-op "change"s.
for f in $(git tag|grep ^emptycommit-); do
    if [ $(git show -s $f | grep NodeAction: |
	  egrep -v "(delete|add) dir|merge|mime-type|change (dir|file) '[^ ]*'>" |
	  wc -l) == 0 ]; then
	git tag -d $f
    fi
done
git tag -d emptycommit-199361