githash-0.1.4.0: README.md

# githash

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Some handy Template Haskell splices for including the current git hash
and branch in the code of your project. Useful for including in panic
messages, `--version` output, or diagnostic info for more informative
bug reports.

Most of the complication in the `GitHash` module is due to the various
places the current git hash might be stored:

1. Detached HEAD: the hash is in `.git/HEAD`
2. On a branch or tag: the hash is in a file pointed to by `.git/HEAD`
in a location like `.git/refs/heads`
3. On a branch or tag but in a repository with packed refs: the hash is
in `.git/packed-refs`

These situations all arise under normal development workflows, but
there might be further scenarios that cause problems. Let me know if
you run into them!