Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

The user must not modify the index while a git pull operation is running,
doing so might cause problems for the merge driver and specific strategy
being used.  Normally on the command line people are just really good and
don't try to run index altering operations while they are also running a
pull.  But in a slick GUI like git-gui we can't trust the user quite as
much.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

On very large projects (~1000 files) on Windows systems the update-index
--refresh stage of the rescan process takes a nontrival amount of time.
If the user is generally very careful with their file modification such
that the modification timestamp of the file differs only when the content
also differs then we can skip this somewhat expensive step and go right
to the diff-index and diff-files processes.

We save the user's prefernce in the current repository if they modify the
setting during a git-gui session, but we also load it through our dump of
repo-config --list so the user could move it to their ~/.gitconfig file
if they wanted it globally disabled.

We still keep update-index --refresh enabled by default however, as most
users will probably want it.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Most users of git-gui probably shouldn't be invoking git repack directly;
instead we should be looking at how many loose objects they have and
how many active packs they have and making the decision for them.  But
that's more work to code, and there's always going to be discussion about
what is the right default threshold and how do we know that the user is
willing to do the repack when we decide its time, etc.

So instead we'll just keep it simple and offer up the menu option.

Unfortunately right now we get now progress indication back from
git-pack-objects as its being invoked not through a tty, which makes
it disable progress output and the git-repack.sh wrapper won't let us
pass through --progress.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Since Tk will only supply new space gained from growing the top level to
the bottom/right most widget within a panedwindow and most users will be
growing a git-gui main window for the purposes of seeing more of the
currently shown diff, flipping the order around makes Tk do what the
user wants by default.

Of course because we also removed the paned window from the commit buffer
area it is now impossible to increase the visible space for the commit
message.  But I don't see this as a huge concern right now as its actually
very awkward to try and balance three paned window dividers within the
same top level window.  We could always add it back if users really want
to expand the commit buffer and see more.

I also corrected a number of bugs that I accidentally introduced in the
last commit.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Removed as much as possible from the merge_state proc, which is where
we spent most of our time before UI update.  This change makes our
running time match that of git status, except that we then need about
7 additional seconds to draw 6900 files on screen.

Apparently the [array names a -exact $v] operator in Tcl is O(n) rather
than O(1), which is really quite disappointing given that each array can
only have one entry for a given value.  Switching to a lookup with a
catch (whose error we ignore) runs in O(1) time and bought us most of
that improvement.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Loading 6900 newly added files required about 90 seconds on one system.
This is just far too long to perform a "status" type of operation.
git-status on the same system completes in just 8.2 seconds if it is
redirected to /dev/null.

Most of our performance improvement comes from moving all of the UI
updating out of the main fileevent handlers for the status process.
Instead we are only updating the file_states array and then only doing
the UI update when all states are known and have been finally determined.

The rescan execution is now down to almost 30 seconds for the same case,
a good (but not really all that impressive) improvement.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

When we were receiving a lot of output from diff-index we split records
at the wrong locations and started using the file status information
(mode and SHA1s) as path names, and then proceeded to try to use part
of the path names as status data.  This caused all sorts of havoc.

So I rewrote the parsing implementation to scan for the pair of null
bytes along the buffer and stop scanning (waiting for more data) if
both can't be found during this event.  This seems to work well under
high load (like when processing 6,983 added files).
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

We now create one menu entry per remote listing the first Pull: or fetch
entry associated with that remote as the branch to pull into the current
branch.

This is actually quite incorrect as we should be using the default
remote branch name listed in branch.<name>.merge for a new-style remote
described in the config file.  But its a good default to get started with.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

We're likely going to need key/value pairs from the repo-config beyond
just remote.*.url, so cache them all up front into a Tcl array where we
have fast access to them without needing to refork a repo-config --list
process.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If the user closes a console and we get more ouptut for it then we
will get a Tcl error in the readable event handle for the file channel.
Since this loses the actual output and is quite unfriendly to the end
user instead reopen any console which the user closed prior to the
additional output arriving.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

The user might be using the new style config syntax remote.name.url
rather than the older standalone remote file.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Because the remote end is likely to send us progress meters by
resetting each line with a CR (and no LF) we should display those
meters by replacing the last line of text with the next line,
just like a normal xterm would do.

This makes the output of fetch look about the same as if we ran it
from within an xterm.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Apparently accelerators really only work correctly for function keys
(F1-F12) and "Cmd-q".  Apparently wish on Mac OS X reports itself
as unix and the OS is Darwin, this makes it a little difficult to
be sure we are running under Aqua.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Because we cd after getting the cdup value from Git we can't try
to get the gitdir until after we perform the cd, as usually the
gitdir is relative to the current working directory.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Apparently the Cygwin tclsh/wish executables don't pass the environment
that they inherited onto any children that they invoke.  This causes a
problem for some users during 'git fetch' or 'git push' as critical
environment variables like GIT_SSH and SSH_AUTH_SOCK aren't available
to the git processes.

So we work around this by forcing sh to start a login shell, thus
reloading the user's environment, then cd to the current directory,
and finally start the requested process.  Of course this won't
correctly handle any transient environment variables that were
inherited but were not supplied by the user's login shell.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

 * Make sure we are in the top level working directory.  This
   way we can access files using their repository path.

 * Reload the diff viewer if the current file's status has changed;
   as the diff may now be different.

 * Correctly handle the 'AD' file state: added but now gone from
   the working directory.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Also fixed a bug related that caused a crash if the file currently
in the diff viewer is no longer modified after the commit.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

We can now commit any type of commit (initial, normal or merge) using
the same techniques as git-commit.sh does for these types of things.

If invoked as git-citool we run exit immediately after the commit was
finished.  If invoked as git-gui then we stay running.

Also fixed a bug which caused the commit message buffer to be lost
when the application shutdown and restarted.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

A user shouldn't perform a commit if any of the following are true:

 * The repository state has changed since the last rescan.
 * There are no files updated in the index to commit.
 * There are unmerged stages still in the index.
 * The commit message has not been provided.
 * The pre-commit hook is executable and declined.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

When we are refreshing from the index or updating the index we shouldn't
let the user cause other index based operations to occur as these would
likely conflict with the currently running operations possibly causing
some index changes to be lost.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

 * Run refresh before diff-index.
 * Load saved commit message during rescan.
 * Save current commit message (if any) during quit.
 * Add Signed-off-by line to commit buffer.
 * Batch update-index invocations through --stdin.
 * Better highlight which file is in the diff viewer.
 * Key bindings for signoff, check-in all and commit.
 * Improved formatting of status table within source.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

This is based on Paul Mackerras' gitool prototype which he offered up
to the community earlier in 2006.  Its mostly however a rewrite from
scratch of a Tcl/Tk based graphical interface for Git and the most
common commands users might need to perform.

Currently it can display the status of the current repository, and not
much else.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>