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Commit Graph

295 Commits

Author SHA1 Message Date
Johannes Sixt
7f15b00273 git-gui: Mark-up strings in show_{other,unmerged}_diff() for localization
Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-10 09:33:21 -07:00
Johannes Sixt
f2df8a5bfb git-gui: Show a round number of bytes of large untracked text files
If an untracked text file is selected, then its contents are displayed
instead of a diff. If the file is large, then the following hint is
inserted at the top:

  * Untracked file is 14774881 bytes.
  * Showing only first 131072 bytes.

Why exactly 131072 bytes? With this patch it is 100000 bytes.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-10 09:33:21 -07:00
Alexander Gavrilov
5c91cb5d0d git-gui: Fix the blame viewer destroy handler.
It did not delete the object, which is not very good.
Also, destroy may be fired up for subwindows, so we
should check %W.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-10 09:33:21 -07:00
Alexander Gavrilov
f10d5b064a git-gui: Add a search command to the blame viewer.
One of the largest deficiencies in the blame viewer at
the moment is the impossibility to search for a text
string. This commit fixes it by adding a Firefox-like
search panel to the viewer.

The panel can be shown by pressing F7 or clicking a
menu entry, and is hidden by pressing Esc. Find Next
is available through the F3 key.

Implementation is based on the gitk code, but heavily
refactored. It now also supports case-insensitive
searches, and uses the text box background color to
signal success or failure of the search.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-10 09:33:21 -07:00
Alexander Gavrilov
d4d992562e git-gui: Fix the blame window shape.
On modern high-resolution monitors the blame viewer
window is very high, yet too narrow. This patch
makes it gravitate to a more sane resolution, which
takes the font size into account.

It also changes the default text view size to 80% of
the window, and slightly modifies the border decorations
for better appearance.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-10 09:33:21 -07:00
Johannes Sixt
a910898e86 git-gui: Fix switch statement in lib/merge.tcl
0aea2842 (Make Ctrl-T safe to use for conflicting files) introduced a new
case, but forgot the '-' to indicate that it shares the body with the
subsequent case label.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-10 09:31:58 -07:00
Petr Baudis
0b32cab933 git-gui: Fix fetching from remotes when adding them
As you can see, this particular code branch did not see a lot
of testing for some time now. Apologies for that.

Signed-off-by: Petr Baudis <pasky@suse.cz>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 12:59:37 -07:00
Petr Baudis
2243ffcc6a git-gui: Fix removing non-pushable remotes
Git-gui does not add most of the remotes to the 'push' menu
since they are missing the "Push" line in their remotespec.
In that case, removing the remote would end up with an error.

Signed-off-by: Petr Baudis <pasky@suse.cz>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 12:59:37 -07:00
Petr Baudis
902e2bb5b7 git-gui: Make input boxes in init/clone/open dialogs consistent
Before, the input boxes would not be sunken and would have larger border,
which is inconsistent with the rest of the inputboxes for repository
locations in the git-gui UI.

Signed-off-by: Petr Baudis <petr.baudis@novartis.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 12:59:18 -07:00
Petr Baudis
4259568d72 git-gui: Avoid using the term URL when specifying repositories
Instead, 'Location' is used to label such inputs; in the Clone dialog,
'Source' and 'Target' are also introduced to further clarify the situation.
The intent is to increase GUI consistency in the case location templates
(upcoming) are used - then, other locators than URL may be used.

Signed-off-by: Petr Baudis <petr.baudis@novartis.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 12:59:18 -07:00
Petr Baudis
adcbd431e7 git-gui: mkdir -p when initializing new remote repository
This allows the user to create repositories with arbitrary paths
on the server. The downside is that errorneously typed paths are
not caught but instead created remotely; YMMV.

Signed-off-by: Petr Baudis <petr.baudis@novartis.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 12:59:18 -07:00
Petr Baudis
0d4044123c git-gui: Add support for removing remotes
We introduce new submenu Remote -> Remove Remote, allowing to remove
remotes. In the future, we might consider a confirmation popup to avoid
misclicks, but removing a remote is not very lossy operation.

Signed-off-by: Petr Baudis <petr.baudis@novartis.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 12:59:18 -07:00
Petr Baudis
ba6485e05d git-gui: Add support for adding remotes
When a remote is being added, it can also be automatically either fetched
or initialized and pushed; this patch adds capability for initializing
of local and ssh repositories. This also of course leaves a lot of space
for further customization features, like individually turning the
initialization phase on/off or tuning attributes of the remote
repository; I consider that out of scope of this patch, however.

Signed-off-by: Petr Baudis <petr.baudis@novartis.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 12:59:18 -07:00
Petr Baudis
8329bd0725 git-gui: Squash populate_{push,fetch}_menu to populate_remotes_menu
The meat of the routines is now separated to add_fetch_entry() and
add_push_entry(). This refactoring will allow easy implementation of adding
individual remotes later.

Signed-off-by: Petr Baudis <petr.baudis@novartis.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 12:59:18 -07:00
Petr Baudis
3c1c2a00b2 git-gui: Clarify the Remote -> Delete... action
Currently, it was not really clear what all does this perform. We rename
"Delete..." to "Delete Branch..." (since this does not delete the remote
as a whole) and relabel the window from "Delete Remote Branch" to "Delete
Branch Remotely" (since the action also involves pushing the delete out).

Signed-off-by: Petr Baudis <petr.baudis@novartis.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 12:59:18 -07:00
Johannes Sixt
34785f8cca git-gui: Remove space from the end of aspell's reply before processing
When git gui processes a reply from aspell it explicitly ignores an empty
line. The Windows version of aspell, however, terminates lines with CRLF,
but TCL's 'gets' does not remove CR, hence, a "visibly" empty line was not
actually recognized as empty. With this change we explicitly trim off
whitespace before the line is further processed.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 12:59:18 -07:00
Alexander Gavrilov
0aea2842d9 git-gui: Make Ctrl-T safe to use for conflicting files.
A previous patch added a check for conflict markers, which
is done when the file is about to be staged due to a click
on the icon. However, pressing Ctrl-T still immediately
stages the file without confirmation. This patch fixes it.

The check requires a loaded diff, so staging multiple files
at once won't work if they are unmerged.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 11:47:33 -07:00
Johannes Sixt
d3bcf55d67 git-gui: Do not automatically stage file after merge tool finishes
If a merge tool was invoked on a conflicted file and the tool completed,
then the conflicted file was staged automatically. However, the fact that
the user closed the merge tool cannot be understood as the unequivocal
sign that the conflict was completely resolved. For example, the user
could have decided to postpone the resolution of the conflict, or could
have accidentally closed the tool. We better leave the file unstaged and
let the user stage it explicitly.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-30 11:40:48 -07:00
Shawn O. Pearce
30ef1d812c Merge branch 'maint' 2008-09-26 07:07:40 -07:00
Gustaf Hendeby
dd87558f58 git-gui: Help identify aspell version on Windows too
On windows, git gui fails to correctly extract the aspell version
(experienced with aspell version 0.50.3) due to scilent white space at
the end of the version string.  Trim the obtained version string to
work around this.

Signed-off-by: Gustaf Hendeby <hendeby@isy.liu.se>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-26 07:07:34 -07:00
Alexander Gavrilov
3e34838caf git-gui: Reenable staging unmerged files by clicking the icon.
This restores functionality of the file icon for unmerged files.
Safety is enforced by loading the diff and checking for lines
that look like conflict markers. If such lines are found, or
the conflict involves deletion and/or symlinks, a confirmation
dialog is presented. Otherwise, the icon immediately stages the
working copy version of the file.

Includes a revert of 2fe5b2ee42897a3acc78e5ddaace3775eb2713ca
(Restore ability to Stage Working Copy for conflicts)

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Tested-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-24 12:51:43 -07:00
Alexander Gavrilov
6fc835a3f3 git-gui: Support the encoding menu in gui blame.
Allow dynamically changing the encoding from the blame
viewer as well.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Tested-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-24 12:48:32 -07:00
Alexander Gavrilov
a1c3feb7fa git-gui: Optimize encoding name resolution using a lookup table.
Encoding menu construction does almost a hundred of encoding
resolutions, which with the old implementation led to a
small but noticeable delay.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Tested-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-24 12:48:32 -07:00
Alexander Gavrilov
3fe0162362 git-gui: Allow forcing display encoding for diffs using a submenu.
Add a submenu to allow dynamically changing the encoding to use
for diffs. Encoding settings are remembered while git-gui runs.
The rules are:

1) Encoding set for a specific file overrides gitattributes.
2) Last explicitly set value of the encoding overrides gui.encoding

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Tested-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-24 12:48:32 -07:00
Alexander Gavrilov
50102c5687 git-gui: Add a menu of available encodings.
To make encoding selection easier, add a menu that
lists available encodings to the Options window.

Menu structure is borrowed from Firefox.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Tested-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-24 12:48:32 -07:00
Alexander Gavrilov
72e6b00202 git-gui: Cleanup handling of the default encoding.
- Make diffs and blame default to the system (locale)
  encoding instead of hard-coding UTF-8.
- Add a gui.encoding option to allow overriding it.
- gitattributes still have the final word.

The rationale for this is Windows support:

1) Windows people are accustomed to using legacy encodings
   for text files. For many of them defaulting to utf-8
   will be counter-intuitive.
2) Windows doesn't support utf-8 locales, and switching
   the system encoding is a real pain. Thus the option.

This patch also adds proper encoding conversion to Apply Hunk/Line.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Tested-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-24 12:48:32 -07:00
Shawn O. Pearce
696235c6c1 git-gui: Assume blame --incremental output is in UTF-8
Most commits have author name encoded in UTF-8, but the incremental
blame output dumps raw bytes and doesn't give us the encoding header
from the commit.  Rather than fixing up tooltip data after we have
viewed that particular commit in the blame viewer we can assume all
names are in UTF-8.

This is still going to cause problems when the author name is not
encoded in UTF-8, but the only (efficient) way to solve that is to
add an "encoding" header to the blame --incremental mode output,
as otherwise we need to run `git cat-file commit $sha1` for each
and every commit identified and that would be horribly expensive
on any platform.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-24 12:48:31 -07:00
Shawn O. Pearce
1ffca60f0b git-gui: Use gitattribute "encoding" for file content display
Most folks using git-gui on internationalized files have complained
that it doesn't recognize UTF-8 correctly.  In the past we have just
ignored the problem and showed the file contents as binary/US-ASCII,
which is wrong no matter how you look at it.

This really should be a per-file attribute, managed by .gitattributes,
so we now pull the "encoding" attribute data for the given path from
the .gitattributes (if available) and use that, falling back to UTF-8
if the attributes are unavailable, git-check-attr is broken, or an
encoding for this path not specified.

We apply the encoding anytime we show file content, which currently
is limited to only the diff viewer and the blame viewer.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-24 12:48:31 -07:00
Alexander Gavrilov
1e65c6225d git-gui: Add more integration options to citool.
- Make citool return nonzero exit code if it did not commit.
- Add a mode where it does not actually commit and simply
  exits with zero code. Commit message is either disabled,
  or simply dumped to GITGUI_EDITMSG before exiting.
- Add an option to immediately start it in amend mode.

Rationale:

1) Use 'git citool --nocommit' instead of mergetool in scripts.
2) Use 'git citool --amend' to edit commits while rebasing.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-24 09:53:01 -07:00
Christian Stimming
8b56a18dea git-gui: I18n fix sentence parts into full sentences for translation again.
For translations, it is almost always impossible to correctly translate
parts of sentences in almost any other language. Hence, messages like this
must be re-organized into full sentences.

Signed-off-by: Christian Stimming <stimming@tuhh.de>
Signed-off-by: Shawn O. Pearce <sop@google.com>
2008-09-12 08:38:42 -07:00
Alexander Gavrilov
2fe5b2ee42 git-gui: Restore ability to Stage Working Copy for conflicts.
Tools like rerere leave files marked as conflicts in the index,
while actually resolving them in the working copy. Also, some
people like to use an external editor to resolve conflicts.

This patch restores functionality previously removed in
commit 617ceee653 by adding a new context menu item.
It still ensures that the user does not stage conflicting files
accidentally by clicking on the icon instead of the name.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Tested-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <sop@google.com>
2008-09-12 08:09:09 -07:00
Alexander Gavrilov
a9786bb42f git-gui: Fix Blame Parent & Context for working copy lines.
Make Blame Parent Commit and Show History Context work
properly for lines blamed on the working copy.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <sop@google.com>
2008-09-12 08:09:09 -07:00
Shawn O. Pearce
95b6a2db25 Merge branch 'maint'
* maint:
  git-gui: Fix diff parsing for lines starting with "--" or "++"
2008-09-04 21:53:06 -07:00
Shawn O. Pearce
ca53c3fdcf git-gui: Fix diff parsing for lines starting with "--" or "++"
Languages like Lua and SQL use "--" to mark a line as commented out.
If this appears at column 0 and is part of the pre-image we may see
"--- foo" in the diff, indicating that the line whose content is
 "-- foo" has been removed from the new version.

git-gui was incorrectly parsing "--- foo" as the old file name
in the file header, causing it to generate a bad patch file when
the user tried to stage or unstage a hunk or the selected line.
We need to keep track of where we are in the parsing so that we do
not misread a deletion or addition record as part of the header.

Reported-by: Alexander Gladysh <agladysh@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-04 21:52:56 -07:00
Alexander Gavrilov
b2ca414973 git-gui: Show special diffs for complex conflict cases.
Add special handling for displaying diffs of modified/deleted,
and symlink/mode conflicts. Currently the display is completely
unusable for deciding how to resolve the conflict.

New display modes:

1) Deleted/Modified conflict: e.g.
	LOCAL: deleted
	REMOTE:
	[diff :1:$path :3:$path]

2) Conflict involving symlinks:
	LOCAL:
	[diff :1:$path :2:$path]
	REMOTE:
	[diff :1:$path :3:$path]

In order to be able to display multiple diffs, this
patch adds a queue of commands to call.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-04 21:28:55 -07:00
Alexander Gavrilov
29853b9010 git-gui: Reimplement and enhance auto-selection of diffs.
Generalize the next_diff system, and implement auto-reselection
for merge tool resolution and reshow_diff. Also add auto-selection
of diffs after rescan, if no diff is already selected.

New auto-select rules:

- Rescan auto-selects the first conflicting file, or if none
  a modified tracked file, if nothing was selected previously.
- Resolving a conflict auto-selects the nearest conflicting
  file, or nothing if everything is resolved.
- Staging the last remaining hunk auto-selects the nearest
  modified staged file.
- Staging a file through its icon auto-selects the nearest file.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-04 21:28:55 -07:00
Alexander Gavrilov
ff515d81fa git-gui: Support conflict states _U & UT.
Support _U (local deleted, remote modified) and
UT (file type changed in conflict) modes.

Note that 'file type changed' does not refer to
changes in the executable bit, instead it denotes
replacing a file with a link, or vice versa.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-04 21:28:55 -07:00
Alexander Gavrilov
48c74a58b1 git-gui: Support more merge tools.
Add native support for Araxis Merge, WinMerge and Perforce merge.

Custom merge tools are not implemented by mergetool.tcl; besides,
native support allows constructing the command lines in a more
intelligent way.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-04 21:28:55 -07:00
Alexander Gavrilov
7e30682ce0 git-gui: Support calling merge tools.
Adds an item to the diff context menu in conflict mode,
which invokes a merge tool for the selected file. Tool
command-line handling code was ported from git-mergetool.

Automatic default tool selection and custom merge tools
are not supported. If merge.tool is not set, git-gui
defaults to meld.

This implementation uses a checkout-index hack in order
to retrieve all stages with autocrlf and filters properly
applied. It requires temporarily moving the original
conflict file out of the way.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-04 21:28:54 -07:00
Alexander Gavrilov
042c232535 git-gui: Support resolving conflicts via the diff context menu.
If the file has merge conflicts, show a special version of the
diff context menu, which includes conflict resolution commands
instead of Stage Hunk/Line. This patch only supports resolving
by discarding all sides except one.

Discarding is the only way to resolve conflicts involving symlinks
and/or deletion, excluding manual editing.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-04 21:28:54 -07:00
Christian Stimming
700e560341 git-gui: Mark forgotten strings for translation.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-04 21:28:48 -07:00
Shawn O. Pearce
961a628fdd Merge branch 'maint'
* maint:
  git-gui: Fix string escaping in po2msg.sh
  git gui: show diffs with a minimum of 1 context line

Conflicts:
	lib/option.tcl
2008-09-01 15:39:56 -07:00
Clemens Buchacher
55ba8a3474 git gui: show diffs with a minimum of 1 context line
Staging hunks without context does not work, because line number
information would have to be recomputed for individual hunks.

Since it is already possible to stage individual lines using
'Stage Line for Commit', zero context diffs are not really
necessary for git gui.

Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-01 12:45:46 -07:00
Alexander Gavrilov
f7078b4091 git-gui: Allow specifying an initial line for git gui blame.
Add a command-line option to make git gui blame automatically
scroll to a specific line in the file. Useful for integration
with other tools.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-08-24 22:00:01 -07:00
Alexander Gavrilov
823f7cf81d git-gui: Better positioning in Blame Parent Commit
Invoke diff-tree between the commit and its parent,
and use the hunks to fix the target line number,
accounting for addition and removal of lines.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-08-24 22:00:01 -07:00
Alexander Gavrilov
80fd76bd58 git-gui: Support passing blame to a parent commit.
Add a context menu item that switches the view to the
parent of the commit under cursor. It is useful to see
how the file looked before the change, and find older
changes in the same lines.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-08-24 22:00:01 -07:00
Alexander Gavrilov
a9c80b83d4 git-gui: Support starting gitk from Gui Blame
Add a context menu command to load commits
that are within a certain time range from the
selected commit into gitk.

It can be useful for understanding of the code,
especially if the repository is imported from
a VCS that does not support atomic commits.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-08-24 22:00:01 -07:00
Gustaf Hendeby
e681cb7d6a git-gui: Teach git gui about file type changes
Signed-off-by: Gustaf Hendeby <hendeby@isy.liu.se>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-08-24 21:36:17 -07:00
Alexander Gavrilov
25b8fb1e49 git-gui: Preserve scroll position on reshow_diff.
It is especially useful for Stage/Unstage Line, because
they invoke full state scan and diff reload, which originally
would reset the scroll position to the top of the file.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-07-27 08:08:10 -07:00
Johannes Sixt
c7f7457026 git-gui: "Stage Line": Treat independent changes in adjacent lines better
Assume that we want to commit these states:

  Old state == HEAD    Intermediate state   New state
  --------------------------------------------------------
  context before       context before       context before
  old 1                new 1                new 1
  old 2                old 2                new 2
  context after        context after        context after

that is, want to commit two changes in this order:

  1. transform "old 1" into "new 1"
  2. transform "old 2" into "new 2"

[This discussion and this patch is about this very case and one other case
as outlined below; any other intermediate states that one could imagine are
not affected by this patch.]

Now assume further, that we have not staged and commited anything, but we
have already changed the working file to the new state. Then we will see
this hunk in the "Unstaged Changes":

  @@ -1,4 +1,4 @@
   context before
  -old 1
  -old 2
  +new 1
  +new 2
   context after

The obvious way to stage the intermediate state is to apply "Stage This
Line" to "-old 1" and "+new 1". Unfortunately, this resulted in this
intermediate state:

  context before
  old 2
  new 1
  context after

which is not what we wanted. In fact, it was impossible to stage the
intermediate state using "Stage Line". The crux was that if a "+" line was
staged, then the "-" lines were converted to context lines and arranged
*before* the "+" line in the forged hunk that we fed to 'git apply'.

With this patch we now treat "+" lines that are staged differently. In
particular, the "-" lines before the "+" block are moved *after* the
staged "+" line. Now it is possible to get the correct intermediate state
by staging "-old 1" and "+new 1". Problem solved.

But there is a catch.

Noticing that we didn't get the right intermediate state by staging
"-old 1" and "+new 1", we could have had the idea to stage the complete
hunk and to *unstage* "-old 2" and "+new 2". But... the result is the same.
The reason is that there is the exact symmetric problem with unstaging the
last "-" and "+" line that are in adjacent blocks of "-" and "+" lines.

This patch does *not* change the way in which "-" lines are *unstaged*.

Why? Because if we did (i.e. move "+" lines before the "-" line after
converting them to context lines), then it would be impossible to stage
this intermediate state:

  context before
  old 1
  new 2
  context after

that is, it would be impossible to stage the two independet changes in the
opposite order.

Let's look at this case a bit further: The obvious way to get this
intermediate state would be to apply "Stage This Line" to "-old 2" and
"+new 2". Before this patch, this worked as expected. With this patch, it
does not work as expected, but it can still be achieved by first staging
the entire hunk, then *unstaging* "-old 1" and "+new 1".

In summary, this patch makes a common case possible, at the expense that
a less common case is made more complicated for the user.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-07-26 16:43:08 -07:00