Most of git dotfiles can be located, at the user's option, in

~/.<file> or in ~/.config/git/<file>, following the [XDG

standard](http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html).

~/.git-credentials and ~/.git-credential-cache are still hardcoded as

~/.<file>, and should allow using the XDG directory layout too

(~/.git-credentials could be allowed as ~/.config/git/credential and

~/.git-credential-cache could be allowed as ~/.cache/git/credential,

possibly modified by $XDG_CONFIG_HOME and $XDG_CACHE_HOME).

Each of these files can be a microproject of its own. The suggested

approach is:

* See how XDG was implemented for other files (run "git log --grep

XDG" in Git's source code) and read the XDG specification.

* Implement and test the new behavior, without breaking compatibility

with the old behavior.

* Update the documentation

This includes:

* git am -3

* git am -c

Some people always run the command with these options, and would

prefer to be able to activate them by default in ~/.gitconfig.

"git diff" shows the function name corresponding to each hunk after

the @@ ... @@ line. For common languages (C, HTML, Ada, Matlab, ...),

the way to find the function name is built-in Git's source code as

regular expressions (see userdiff.c). A few languages are common

enough to deserve a built-in driver, but are not yet recognized. For

example, CSS, shell.