import polymer_elements and polymer_ui_elements repos while retaining history

[zoechi]

http://saintgimp.org/2013/01/22/merging-two-git-repositories-into-one-repository-without-losing-file-history/
has a good description how to do it

seems a good documentation too
http://blog.caplin.com/2013/09/18/merging-two-git-repositories/comment-page-1/

[zoechi]

I used this instructions http://julipedia.meroh.net/2014/02/how-to-merge-multiple-git-repositories.html

# with Linux
md core_elements_merge
cd core_elements_merge
git clone git@github.com:bwu-dart/core_elements.git
git remote add polymer_elements git@github.com:ErikGrimes/polymer_elements.git
git fetch polymer_elements
git branch merge_pe polymer_elements/master
git checkout merge_pe
mkdir polymer_elements
# git mv * polymer_elements didn't work because it also tried to move polymer_elements into itself
# so I move all files/directories (but .git) one by one
git mv abc polymer_elements
git commit -a -m "Move."

# I won't merge all together yet.
# I want to pull elements I want to migrate to core-elements into master one by one 
# I think we can remove the polymer_elements remote though

git remote remove polymer_elements
git push origin merge_pe

# git log --follow filename # shows the previous history as does the Blame feature in GitHub so I consider it a success and do the same with polymer_ui_elements

cd .. # go out of polymer_elements directory because it doesn't exist in master
git co master
git remote add polymer_ui_elements git@github.com:ErikGrimes/polymer_ui_elements.git
git fetch polymer_ui_elements
git branch merge_puie polymer_ui_elements/master
git checkout merge_puie
mkdir polymer_ui_elements
# git mv * polymer_ui_elements didn't work because it also tried to move polymer_ui_elements into itself
# so I move all files/directories (but .git) one by one
git mv abc polymer_ui_elements
git commit -a -m "Move."

# I won't merge all together yet.
# I want to pull elements I want to migrate to core-elements into master one by one 
# I think we can remove the polymer_ui_elements remote though

git remote remove polymer_ui_elements
git push origin merge_puie