I got slightly confused when I did two merges in a row, as the status
bar said "merge completed successfully" while the second merge was
still running.  Now we show what branches are actively being merged.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If you get into the middle of a merge that turns out to be horrible
and just not something you want to do right now, odds are you need
to run `git reset --hard` to recover your working directory to a
pre-merge state.

We now offer Merge->Abort Merge for exactly this purpose, however
its also useful to thow away a non-merge, as its basically the same
logic as `git reset --hard`.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

To allow users to merge local heads and tracking branches we now offer
a dialog which lets the user select 1-15 branches and merge them using
the stock `git merge` Grand Unified Merge Driver.

Originally I had wanted to implement this merge internally within git-gui
as I consider GUMD to be mostly Porcelain-ish, but the truth is it does
its job exceedingly well and its a relatively complex chunk of code.
I'll probably circle back later and try to remove the invocation of GUMD
from git-gui, but right now it lets me get the job done faster.

Users cannot start a merge if they are currently in the middle of one,
or if they are amending a commit.  Trying to do either is just stupid
and should be stopped as early as possible.

I've also made it simple for users to startup a gitk session prior to
a merge by offering a Visualize button which runs `gitk $revs --not HEAD`,
where $revs is the list of branches currently selected in the merge
dialog.  This makes it quite simple to find out what the damage will
be to the current branch if you were to carry out the currently proposed
merge.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Technically the new git-gc command is strictly Porcelain; its invoking
multiple plumbing commands to do its work.  Since git-gui tries to not
rely on Porclain we shouldn't be invoking git-gc directly, instead we
should perform its tasks on our own.

To make this easy I've created console_chain, which takes a list of
tasks to perform and runs them all in the same console window.  If
any individual task fails then the chain stops running and the window
shows a failure bar.  Only once all tasks have been completed will it
invoke console_done with a successful status.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Because I want to be able to run multiple output-producing commands
in a single 'console' window within git-gui I'm refactoring the
console handling routines to require the "after" argument of console_exec.
This should specify a procedure to execute which will receive two args,
the first is the console window handle and the second is the status of
the last command (0 on failure, 1 on success).

A new procedure console_done can be passed to the last console_exec
command to forward perform all cleanup and enable the Close button.
Its status argument is used to update the final status bar on the
bottom of the console window.

This isn't any real logic changing, and no new functionality is in
this patch.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Right now `git-push -v` is actually not that verbose; it merely adds
the URL it is pushing to.  This can be informative if you are pushing
to a configured remote, as you may not actually remember what URL that
remote is connected to.  That detail can be important if the push
fails and you attempt to communicate the errors to a 3rd party to help
you resolve the issue.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Because we aren't going to support single click pulling of changes from
an existing remote anytime in the near future, I'm moving the code which
used to perform that action.  Hopefully we'll be able to do something
like it in the near-future, but also support local branches just as
easily.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Because its common for some users to push topic branches to a remote
repository for review and merging by other parties, users need an
easy way to push one or more branches to a remote repository without
needing to edit their .git/config file anytime their set of active
branches changes.

We now provide a basic 'Push...' menu action in the Push menu which
opens a dialog allowing the user to select from their set of local
branches (refs/heads, minus tracking branches).  The user can designate
which repository to send the changes to by selecting from an already
configured remote or by entering any valid Git URL.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Anytime we are using lsearch we are doing [lsearch -sorted] and we
are applying it to file paths (or file path like things).  Its valid
for these to contain special glob characters, but when that happens
we do not want globbing to occur.  Instead we really need exact
match semantics.  Always supplying -exact to lsearch will ensure that
is the case.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

I just noticed that a file was always jumping to compare against HEAD
and the index during a refresh, even if the diff viewer was comparing
the index against the working directory prior to the refresh.  The
bug turned out to be caused by a foreach loop going through all file
list names searching for the path.  Since $ui_index was the first one
searched and the file was contained in that file list the loop broke
out, leaving $w set to $ui_index when it had been set by the caller
to $ui_workdir.  Silly bug caused by using a parameter as a loop
index.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Its pointless to switch to the current branch, so don't do it. We
are already on it and the current index and working directory should
just be left alone.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

The Pull menu as it stands right now is a really horrible idea.  Most
users will have too many branches show up in this menu, and what with
the new globbing syntax for fetch entries we were offering up possible
merging that just isn't really valid.  So this menu is dead and will
be rewritten to support better merge capabilities.

The Branch menu shouldn't include a separator entry if there are no
branches, it just looks too damn weird.  This can happen in an initial
repository before any branches have been created and before the first
commit.

The Fetch and Push menus should just be organized around their own
menus rather than being given the menu to populate.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

I'm a fool and previously used a text widget configured with a height
of 1 and special bindings to handle focus traversal rather than the
already built (and properly behaved) entry widget.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

The stat frame was right on the edge of the window on Mac OS X,
making the frame's border blend in with the window border.  Not
exactly the effect I had in mind.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Now that recent versions of gitk (shipping with at least git 1.5.0-rc1
and later) actually accept command line revision specifiers without
crashing on internal Tk errors we can offer the 'Visualize All Branches'
menu item in the Repository menu on Mac OS X.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Apparently a "feature" of Tcl/Tk on Mac OS X is that a disabled text
widget cannot receive focus or receive a selection within it.  This
makes the diff viewer almost useless on that platform as you cannot
select individual parts of the buffer.

Now we force focus into the diff viewer when its clicked on with
button 1.  This works around the feature and allows selection to
work within the viewer just like it does on other less sane systems,
like Microsoft Windows.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

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

When committing changes its useless to have trailing whitespace on the
end of a line within the commit message itself; this serves no purpose
beyond wasting space in the repository.  But it happens a lot on my
Mac OS X system if I copy text out of a Terminal.app window and paste
it into git-gui.

We now clip any trailing whitespace from the commit buffer when loading
it from a file, when saving it out to our backup file, or when making
the actual commit object.

I also fixed a bug where we lost the commit message buffer if you quit
without editing the text region.  This can happen if you quit and restart
git-gui frequently in the middle of an editing session.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If we are displaying a diff for a DOS-style (CRLF) formatted file then
the Tk text widget would normally show the CR at the end of every line;
in most fonts this will come out as a square box.  Rather than showing
this character we'll tag it with a tag which forces the character to
be elided away, so its not displayed.  However since the character is
still within the text buffer we can still obtain it and supply it over
to `git apply` when staging or unstaging an individual hunk, ensuring
that the file contents is always fully preserved as-is.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Just like `git-add --interactive` we can now stage and unstage individual
hunks within a file, rather than the entire file at once.  This works
on the basic idea of scanning backwards from the mouse position to
find the hunk header, then going forwards to find the end of the hunk.
Everything in that is sent to `git apply --cached`, prefixed by the
diff header lines.

We ignore whitespace errors while applying a hunk, as we expect the
user's pre-commit hook to catch any possible problems. This matches
our existing behavior with regards to adding an entire file with
no whitespace error checking.

Applying hunks means that we now have to capture and save the diff header
lines, rather than chucking them.  Not really a big deal, we just needed
a new global to hang onto that current header information.  We probably
could have recreated it on demand during apply_hunk but that would mean
we need to implement all of the funny rules about how to encode weird
path names (e.g. ones containing LF) into a diff header so that the
`git apply` process would understand what we are asking it to do.  Much
simpler to just store this small amount of data in a global and replay
it when needed.

I'm making absolutely no attempt to correct the line numbers on the
remaining hunk headers after one hunk has been applied.  This may
cause some hunks to fail, as the position information would not be
correct.  Users can always refresh the current diff before applying a
failing hunk to work around the issue.  Perhaps if we ever implement
hunk splitting we could also fix the remaining hunk headers.

Applying hunks directly means that we need to process the diff data in
binary, rather than using the system encoding and an automatic linefeed
translation.  This ensures that CRLF formatted files will be able to be
fed directly to `git apply` without failures.  Unfortunately it also means
we will see CRs show up in the GUI as ugly little boxes at the end of
each line in a CRLF file.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

There is no reason to attempt refreshing an empty diff viewer, so
the Refresh option of our diff context menu should be disabled when
there is no diff currently shown.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Just as we show the amount of disk space taken by the loose objects,
its interesting to know how much space is taken by the packs directory.
So show that in our Database Statistics dialog.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

In the new branch dialog and delete branch dialog we are using the
system default labelframe border settings (whatever those are) and
they look reasonable on both Windows and Mac OS X.  But for some
unknown reason to me I used a raised border for the options dialog.
It doesn't look consistent anymore, so I'm switching it to the
defaults.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If the user selects a different branch from the Branch menu, or asks
us to create a new branch and immediately checkout that branch we
now perform the update of the working directory by way of a 2 way
read-tree invocation.

This emulates the behavior of `git checkout branch` or the behavior
of `git checkout -b branch initrev`.  We don't however support the
-m style behavior, where a switch can occur with file level merging
performed by merge-recursive.  Support for this is planned for a
future update.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Its nice to know how many loose objects and roughly how much disk space
they are taking up, so that you can guestimate about when might be a
good time to run 'Compress Database'.  The same is true of packfiles,
especially once the automatic keep-pack code in git-fetch starts to
be more widely used.

We now offer the output of count-objects -v in a nice little dialog
hung off the Repository menu.  Our labels are slightly more verbose
than those of `count-objects -v`, so users will hopefully be able
to make better sense of what we are showing them here.

We probably should also offer pack file size information, and data
about *.idx files which exist which lack corresponding *.pack files
(a situation caused by the HTTP fetch client).  But in the latter
case we should only offer the data once we have way to let the user
clean up old and inactive index files.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Git prefers that all log messages are encoding in UTF-8.  So now when
git-gui generates the commit message it converts the commit message
text from the internal Tcl Unicode representation into a UTF-8 file.
The file is then fed as stdin to git-commit-tree.  I had to start
using a file here rather than feeding the message in with << as
<< uses the system encoding, which we may not want.

When we reload a commit message via git-cat-file we are getting the
raw byte stream, with no encoding performed by Git itself.  So unless
the new 'encoding' header appears in the message we should probably
assume it is utf-8 encoded; but if the header is present we need to
use whatever it claims.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Since git operates on filenames using the operating system encoding
any data we are receiving from it by way of a pipe, or sending to it
by way of a pipe must be formatted in that encoding.  This should
be the same as the Tcl system encoding, as its the encoding that
applications should be using to converse with the operating system.

Sadly this does not fix the gitweb/test file in git.git on Macs;
that's due to something really broken happening in the filesystem.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

This newline is stupid; it doesn't get put here unless the file
is very large, and then its just sort of out of place.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

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

Users may want to know what a file is before they add it to the
repository, especially if its a binary file.  So when possible
invoke 'file' on the path and try to get its output.  Since
this is strictly advice to the user we won't bother to report
any failures from our attempt to run `file`.

Since some file commands also output the path name they were
given we look for that case and strip it off the front of the
returned output before placing it into the diff viewer.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Our internal diff viewer displays untracked files to help users see if
they should become tracked, or not.  It is not meant as a full file
viewer that handles any sort of input.  Consequently it is rather
unreasonable for users to expect us to show them very large files.
Some users may click on a very big file (and not know its very big)
then get surprised when Tk takes a long time to load the content and
render it, especially if their memory is tight and their OS starts to
swap processes out.

Instead we now limit the amount of data we load to the first 128 KiB
of any untracked file.  If the file is larger than 128 KiB we display
a warning message at the top of our diff viewer to notify the user
that we are not going to load the entire thing.  Users should be able
to recognize a file just by its first 128 KiB and determine if it
should be added to the repository or not.

Since we are loading 128 KiB we may as well scan it to see if the
file is binary.  So I've removed the "first 8000 bytes" rule and
just allowed git-gui to scan the entire data chunk that it read in.
This is probably faster anyway if Tcl's [string range] command winds
up making a copy of the data.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

A binary file can be very large, and showing the complete content of
one is horribly ugly and confusing.  So we now use the same rule that
core Git uses; if there is a NUL byte (\0) within the first 8000 bytes
of the file we assume it is binary and refuse to show the content.

Given that we have loaded the entire content of the file into memory
we probably could just afford to search the whole thing, but we also
probably should not load multi-megabyte binary files either.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If we got an empty diff its probably because the modification time of
the file was changed but the file content hasn't been changed.  Typically
this happens because an outside program modified the file and git-gui
was told to not run 'update-index --refresh', as the user generally
trusts file modification timestamps.  But we can also get an empty diff
when a program undos a file change and still updates the modification
timestamp upon saving, but has undone the file back to the same as what
is in the index or in PARENT.

So even if gui.trustmtime is false we should still run a rescan on
an empty diff.  This change also lets us cleanup the dialog message
that we show when this case occurs, as its no longer got anything to
do with Trust File Modification Timestamps.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If one or both versions of the file don't have a newline at the end
of the file we get a line telling us so in the diff output.  This
shouldn't be tagged, nor should it generate a warning about not
being tagged.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Sometimes the Select All action from our context menus doesn't work
unless the text field its supposed to act on has focus.  I'm not
really sure why adding the sel tag requires having focus.  It
technically should not be required to update the sel tag membership,
but perhaps there is a bug in Tcl/Tk 8.4.1 on Windows which is
causing this odd behavior.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

We don't want to tag these new file/delete file lines, as they aren't
actually that interesting.  Its quite clear from the diff itself that
the file is a new file or is a deleted file (as the entire thing will
appear in the diff).
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Its possible for external programs to update file modification dates of
many files within a repository.  I've seen this on Windows with a popular
virus scanner, sadly enough.  If the user has Trust File Modification
Timestamp enabled and the virus scanner touches a large number of files
it can be annoying trying to clear them out of the 'Changed But Not
Updated' file list by clicking on them one at a time to load the diff.

So now we force a rescan as soon as one such file is found, and for
just that rescan we disable the Trust File Modification Timestamp option
thereby allowing Git to update the modification dates in the index.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

We sometimes see a mode line show up in a diff if the file mode was
changed.  But its not something we format specially.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If we are making an initial commit our branch head did not exist when
we scanned for all heads during startup.  Consequently we won't have
it in our branch menu.  So force it to be put there after the ref was
created.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

I didn't really like the way a new git-gui launched in a new repository
as the window geometry wasn't quite the best layou.  So this is a minor
tweak to try and get space distributed around the window better.

By decreasing the widths we're also able to shrink the gui smaller
without Tk clipping content at the edge of the window.  A nice feature.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>