paulmoore

--- base64.lua
--
-- https://gist.github.com/2563975
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-- V0.3 for Lua 5.1
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-- A simple Base64 encoder/decoder that uses a URL safe variant of the standard.
-- This implementation encodes character 62 as '-' (instead of '+') and character 63 as '_' (instead of '/').
-- In addition, padding is not used by default.
-- A full description of the specification can be found here: http://tools.ietf.org/html/rfc4648

ssp

How to extract a single file with its history from a git repository

These steps show two less common interactions with git to extract a single file which is inside a subfolder from a git repository. These steps essentially reduce the repository to just the desired files and should performed on a copy of the original repository (1.).

First the repository is reduced to just the subfolder containing the files in question using git filter-branch --subdirectory-filter (2.) which is a useful step by itself if just a subfolder needs to be extracted. This step moves the desired files to the top level of the repository.

Finally all remaining files are listed using git ls, the files to keep are removed from that using grep -v and the resulting list is passed to git rm which is invoked by git filter-branch --index-filter (3.). A bit convoluted but it does the trick.

1. copy the repository to extract the file from and go to the desired branch