gitconfig for managing multiple git identities

.gitconfig

[user]
	; No default user, lest you start a project as the wrong user.
	; You have to specify your identity per-repository, using init-xxx or setuser-xxx.
	; @@@@@ TODO: Should actually give an error when trying to commit before specifying an identity.
	name = "@@@No user configured@@@"
	email = "@@@No user configured@@@"

[alias]
	
	;;;;;; init and user control
	; Creates an empty repository with root commit
	; "git remote add origin .." is to make relative paths in submodules work; see http://stackoverflow.com/questions/1974181/
	z--init-root-commit = !git init && git commit -m 'root commit' --author 'nobody <nobody@localhost>' --allow-empty && git remote add origin ..
	init-u0 = !git z--init-root-commit && git setuser-u0
	init-u1 = !git z--init-root-commit && git setuser-u1
	; sets user info for the current repository. Should be run immediately after init. Author info is not changed in existing commits.
	setuser-u0 = !git config user.name 'Username 0' && git config user.email '[email protected]' && git whoami
	setuser-u1 = !git config user.name 'Username 1' && git config user.email '[email protected]' && git whoami
	;whoami = config --get-regexp 'user\\..*'
	whoami = !bash -c 'echo \"$(git config --get user.name) <$(git config --get user.email)>\"'

email = "(none)" would do the work of causing an error in commit if no per-local identity is configured.