I'm finding it difficult to work with a 6,000+ line Tcl script
and not go insane while looking for a particular block of code.
Since most of the program is organized into different units of
functionality and not all users will need all units immediately
on startup we can improve things by splitting procs out into
multiple files and let auto_load handle things for us.

This should help not only to better organize the source, but
it may also improve startup times for some users as the Tcl
parser does not need to read as much script before it can show
the UI.  In many cases the user can avoid reading at least half
of git-gui now.

Unfortunately we now need a library directory in our runtime
location.  This is currently assumed to be $(sharedir)/git-gui/lib
and its expected that the Makefile invoker will setup some sort of
reasonable sharedir value for us, or let us assume its going to be
$(gitexecdir)/../share.

We now also require a tclsh (in TCL_PATH) to just run the Makefile,
as we use tclsh to generate the tclIndex for our lib directory.  I'm
hoping this is not an unncessary burden on end-users who are building
from source.

I haven't really made any functionality changes here, this is just a
huge migration of code from one file to many smaller files.  All of
the new changes are to setup the library path and install the library
files.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Like core-Git we now track the values that we embed into our shell
script wrapper, and we "recompile" that wrapper if they are changed.
This concept was lifted from git.git's Makefile, where a similar
thing was done by Eygene Ryabinkin.  Too bad it wasn't just done
here in git-gui from the beginning, as the git.git Makefile support
for GIT-GUI-VARS was really just because git-gui doesn't do it on
its own.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

This reverts commit 871f4c97.

Too many users have complained about the credits generator in
git-gui, so I'm backing the entire thing out.  This revert will
finish that series.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Now that git-gui has been released to the public as part of Git 1.5.0
I am starting to see some work from other people beyond myself and
Paul.  Consequently the copyright for git-gui is not strictly the
two of us anymore, and these others deserve to have some credit
given to them.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

I'm stealing the exact logic used by core Git within its own Makefile to
setup the version number within scripts and executables.  This way we
can be sure that the version number is always updated after a commit,
and that the version number also reflects when it is coming from a dirty
working directory (and is thus pretty worthless).

I've cleaned up some of the version display code in the about dialog too.
There were simply too many blank lines in the bottom section where we
showed the version data.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

We want to embed the version of git-gui directly into the script file,
so that we can display it properly in the about dialog.  Consequently
I've refactored the Makefile process to act like the one in core git.git
with regards to shell scripts, allowing git-gui to be constructed by a
sed replacement performed on git-gui.sh.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>