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>

Up until now git-gui did not support the new wildcard syntax used to
fetch any remote branch into a tracking branch during 'git fetch'. Now
if we identify a tracking branch as ending with the string '/*' then
we use for-each-ref to print out the reference names which may have
been fetched by that pattern.  We also now correctly filter any
tracking branches out of refs/heads, if they user has placed any there.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

When the user selects a starting revision from one of our offered popup
lists (local branches or tracking branches) or enters in an expression
in the expression input field we should automatically activate the
corresponding radio button for them.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If the user is tabbing through fields in the options dialog they are
likely to want to just enter a new value for the field, rather than
edit the value in-place.  This is easier if we select the entire value
upon focusing into the field.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

When we are in a dialog such as the new branch dialog or our options
dialog we should permit the user to traverse around through the available
widgets with their Tab/Shift-Tab key combinations.  So in any single
line text field where we don't want tab characters to actually be
inserted into the value rebind Tab and Shift-Tab to honor what the
tk_focusPrev and tk_focusNext scripts recommend.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Typically I'm creating all new branches with the same prefix, e.g. 'sp/'.
So its handy to be able to setup a repository (or global) level config
option for git gui which contains this initial prefix.  Once set then
git-gui will load it into the new branch name field whenever a new
branch is being created.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

New branches must have a name.  An empty one is not a valid ref, but the
generic message "We do not like '' as a branch name." is just too vague
or difficult to read.  So detect the missing name early and tell the
user it must be entered.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

I refactored the common code related to tracking branch listing into
a new procedure all_tracking_branches.  This saves a few lines and
should make the create and delete dialogs easier to maintain.

We now don't offer a radio button to create from a tracking branch
or merge-check a tracking branch if there are no tracking branches
known to git-gui.  This prevents us from creating an empty option
list and letting the user try to shoot themselves in the foot by
asking us to work against an empty initial revision.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Some of my file paths in some of my repositories are very long, this
is rather typical in Java projects where the path name contains a deep
package structure and then the file name itself is rather long and
(hopefully) descriptive.  Seeing these paths line wrap in the file lists
looks absolutely horrible.  The entire rendering is almost unreadable.

Now we draw both horizontal and vertical scrollbars for both file lists,
and we never line wrap within the list text itself.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Because users who use git-gui are likely to also be using gitk, we
should at least match gitk's default colors and formatting within the
diff viewer.

Unfortunately this meant that I needed to change the background colors
of the hunks in a 'diff --cc' output, as the green used for 'added line'
was completely unreadable on the old color.  We now use ivory1 to show
hunks which came from HEAD/parent^1, which are the portions that the
current branch has contributed, and are probably the user's own changes.
We use a very light blue for the portions which came from FETCH_HEAD,
as this makes the changes made by the other branch stand out more in the
diff.

I've also modified the hunk header lines to be blue, as that is how gitk
is showing them.

Apparently I forgot to raise the sel tag above everything else in the
diff viewer, which meant that selections in the diff viewer were not
visible if they were made on a 'diff --cc' hunk which had a background.
Its now the higest priority tag, ensuring the selection is always visible
and readable.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If a path is really unmerged, such as because it has been deleted and
also modifed, we cannot obtain a diff for it.  Instead Git is sending
back '* Unmerged path <blah>' for file <blah>.  We should display this
line as-is as our tag selecting switches don't recognize it.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If the user has not added any files yet they cannot commit.  But
telling them this isn't an error, its really just an informational
note meant to push the user in the correct direction.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Just like how we split out the local and remote branches into two
different pick lists for branch creation, we should do the same
thing for branch deletion.  This means that  there are really 3
modes of operation here:

  * delete only if merged into designated local branch;
  * delete only if merged into designated tracking (remote) branch;
  * delete no matter what

So we now use radio buttons to select between these operations.

We still default to checking for merge into the current branch,
as that is probably the most commonly used behavior. It also is
what core Git's command line tools do.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Using a stack of frames in the Starting Revision section of the new
branch dialog turned out to be a mess.  The varying lengths of each
label caused the optionMenu widgets to be spread around the screen
at unaligned locations, making the interface very kludgy looking.

Now we layout the major sections of the branch dialog using grid
rather than pack, allowing these widgets to line up vertically in
a nice neat column.  All extra space is given to column 1, which is
where we have located the text fields.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

The new branch name input box was showing up too close to the labelframe
border, it was basically right on top of it on Windows.  This didn't
look right when compared to the Starting Revision's expression input
field, as that had a 5 pixel padding.

So I've put the new name input box into its own frame and padded that
frame by 5 pixels, making the UI more consistent.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Its impossible to commit an index which has unmerged stages.

Unfortunately a bug in git-gui allowed the user to try to do exactly that,
as we broke out of our file scanning loop as soon as we found a valid AMD
index state.  That's wrong, as the files are coming back from our array
in pseudo-random order; an unmerged file may get returned only after all
merged files.

I also noticed the grammer around here in our dialog boxes still used
the term 'include', so this has been updated to reflect current usage.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Sometimes you want to just force the diff to redisplay itself without
rescanning every file in the filesystem (as that can be very costly
on large projects and slow operating systems).  Now you can force a
diff-only refresh from the context menu.  Previously you could also
do this by reclicking on the file name in the UI, but it may not be
obvious to all users, having a context menu option makes it more
clear.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

A prior commit tried to use the old index state for the old working
directory state during a UI refresh of a file.  This caused files
which were being unstaged (and thus becoming unmodified) to drop
out of the working directory side of the display, at least until
the user performed a rescan to force the UI to redisplay everything.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If the user switches the currently shown file from one side of the UI
to the other then how its diff is presented would be different.  And
leaving the old diff up is downright confusing.

Since the diff is probably not interesting to the user after the switch
we should just clear the diff viewer.  This saves the user time, as they
won't need to wait for us to reload the diff.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

We were not correctly setting the old state of an index display to
_ if the index was previously unmerged.   This caused us to try and
update a U->M when resolving a merge conflict but we were unable to
do so as the icon did not exist in the index viewer.  Tk did not
like being asked to modify an icon which was undefined.

Now we always transform both the old and the new states for both
sides (index and working directory) prior to updating the UI.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

Now that we are using 'git diff' to display unmerged working directory
files we are getting 'diff --cc' output rather than 'diff --combined'
output.  Further the markers in the first two columns actually make
sense here, we shouldn't attempt to rewrite them to something else.

I've added 'diff --cc *' to the skip list in our diff viewer, as that
particular line is not very interesting to display.

I've completely refactored how we perform detection of the state of a
line during diff parsing; we now report an error message if we don't
understand the particular state of any given line.  This way we know
if we aren't tagging something we maybe should have tagged in the UI.

I've also added special display of the standard conflict hunk markers
(<<<<<<<, =======, >>>>>>>).  These are formatted without a patch op
as the patch op is always '+' or '++' (meaning the line has been added
relative to the committed state) and are displayed in orange bold text,
sort of like the @@ or @@@ marker line is at the start of each hunk.

In a 3 way merge diff hunks which came from our HEAD are shown with a
azure2 background, and hunks which came from the incoming MERGE_HEAD
are displayed with a 'light goldenrod yellow' background.  This makes
the two different hunks clearly visible within the file.  Hunks which
are ++ or -- (added or deleted relative to both parents) are shown
without any background at all.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

If a file has a merge conflict we want it to show up in the 'Changed
But Not Updated' file list rather than the 'Changes To Be Committed'
file list.  This way the user can mostly ignore the left side (the
HEAD<->index comparsion) while resolving a merge and instead focus
on the merge conflicts, which are just shown on the right hand side.

This requires detecting the U state in the index side and drawing
it as though it were _, then forcing the working directory side to
have a U state.  We have to delay this until presentation time as
we don't want to change our internal state data to be different
from what Git is telling us (I tried, the patch for that was ugly
and didn't work).

When showing a working directory diff and its a merge conflict we
don't want to use diff-files as this would wind up showing any
automatically merged hunks obtained from MERGE_HEAD in the diff.
These are not usually very interesting as they were completed by
the system.  Instead we just want to see the conflicts.  Fortunately
the diff porcelain-ish frontend (aka 'git diff') detects the case of
an unmerged file and generates a --cc diff against HEAD and MERGE_HEAD.
So we now force any working directory diff with an index state of 'U'
to go through that difference path.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>