Both -n<n> and -n <n> are supported.  POSIX versions of head(1) and
tail(1) allow their line limits to be parsed this way.  I find
--max-count to be a commonly used option, and also similar in spirit to
head/tail, so I decided to make life easier on my worn out (and lazy :)
fingers with this patch.
Signed-off-by: NEric Wong <normalperson@yhbt.net>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

This only applies to traditional diffs, not to git diffs.
Signed-off-by: NDaniel Barkalow <barkalow@iabervon.org>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Add a way to store the results of an HTTP request when a slot finishes
so the results can be processed after the slot has been reused.
Signed-off-by: NNick Hengeveld <nickh@reactrix.com>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

We have operations to "extract" and "update" a "struct tree_desc", but we
only used them in tree-diff.c and they were static to that file.

But other tree traversal functions can use them to their advantage
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Signed-off-by: NJunio C Hamano <junkio@cox.net>

It was open-coding getting the commit date from a commit.
Signed-off-by: NDaniel Barkalow <barkalow@iabervon>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

It was using an open-coded tree parser; use a struct tree instead.
Signed-off-by: NDaniel Barkalow <barkalow@iabervon.org>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Here's some changes to the cvs-migration.txt.  As usual, in my attempt
to make things clearer someone may have found I've made them less so, or
I may have just gotten something wrong; so any review is welcomed.

I can break up this sort of thing into smaller steps if preferred, the
monolothic patch is just a bit simpler for me for this sort of
thing.

I moved the material describing shared repository management from
core-tutorial.txt to cvs-migration.txt, where it seems more appropriate,
and combined two sections to eliminate some redundancy.

I also revised the earlier sections of cvs-migration.txt, mainly trying
to make it more concise.

I've left the last section of cvs-migration.txt (on CVS annotate
alternatives) alone for now.
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Updated with Randall Schwartz's suggestion.
Signed-off-by: NMartin Langhoff <martin@catalyst.net.nz>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Replaced backticks with potentially troublesome unescaped input with
safe_pipe_capture().
Signed-off-by: NMartin Langhoff <martin@catalyst.net.nz>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

A couple of things that seem to help importing broken CVS repos...

 -S '<slash-delimited-regex>' skips files with a matching path
 -v prints file name and version before fetching from cvs
Signed-off-by: NMartin Langhoff <martin@catalyst.net.nz>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Signed-off-by: NJunio C Hamano <junkio@cox.net>

Signed-off-by: NFredrik Kuivinen <freku045@student.liu.se>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Signed-off-by: NFredrik Kuivinen <freku045@student.liu.se>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

The example hook barfs on the initial import.  Ideally it should
produce a diff from an empty tree, but for now let's stop at
squelching the bogus error message.  Often an initial import
involves tons of badly formatted files from foreign SCM, so not
complaining about them like this patch does might actually be a
better idea than enforcing the "Perfect Patch" format on them.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Signed-off-by: NJunio C Hamano <junkio@cox.net>

The previous round forgot to make sure there actually are two
versions to compare against the working tree version.  Otherwise
using -c/--cc would not make much sense.

Also plug a small memory leak.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

The latest update to avoid misspelled revs interfered when we
were not interested in parsing non flags or arguments not meant
for rev-list.  This makes these two forms work again:

	git whatchanged -- git-fetch-script

We could enable "!def" in the part this change touches to make
the above work without '--', but then it would cause misspelled
v2.6.14..v2.6.16 to be given to diff-tree and defeats the whole
point of the previous fix.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Earier specifying an abbreviation shorter than minimum fell back
to full 40 letters, which was nonsense.  Make it to fall back to
the minimum number (currently 4).
Signed-off-by: NJunio C Hamano <junkio@cox.net>

When displaying Merge: lines, we used to take the real commit
parents from the commit objects.  Use the parsed parents from
the commit object instead, so that we honor fake parent
information from info/grafts.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Signed-off-by: NJunio C Hamano <junkio@cox.net>

The usage of rev-parse to serve as a flag/option parser
for git-whatchanged and other commands have serious limitation
that the flags cannot be something that is supported by
rev-parse itself, and it cannot worked around easily.  Since
this is rarely used "poor-man's describe", rename the option for
now as an easier workaround.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

We do not allow abbreviation shorter than 4 letters in other
parts of the system so do not attempt to generate such.

Noticed by Uwe Zeisberger.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

When --abbrev is in effect, abbreviate the merge parent names
in prettyprinted output.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

The new option behaves just like --verify, but outputs an
abbreviated object name that is unique within the repository.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

The minimum length of abbreviated object name was hardcoded in
different places to be 4, risking inconsistencies in the future.
Also there were three different "default abbreviation
precision".  Use two C preprocessor symbols to clean up this
mess.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Signed-off-by: NJunio C Hamano <junkio@cox.net>

The one thing I've considered doing (I really should) is to add a "stop
when you don't find the file" option to "git-rev-list". This patch does
some of the work towards that: it removes the "parent" thing when the
file disappears, so a "git annotate" could do do something like

	git-rev-list --remove-empty --parents HEAD -- "$filename"

and it would get a good graph that stops when the filename disappears
(it's not perfect though: it won't remove all the unintersting commits).

It also simplifies the logic of finding tree differences a bit, at the
cost of making it a tad less efficient.

The old logic was two-phase: it would first simplify _only_ merges tree as
it traversed the tree, and then simplify the linear parts of the remainder
independently. That was pretty optimal from an efficiency standpoint
because it avoids doing any comparisons that we can see are unnecessary,
but it made it much harder to understand than it really needed to be.

The new logic is a lot more straightforward, and compares the trees as it
traverses the graph (ie everything is a single phase). That makes it much
easier to stop graph traversal at any point where a file disappears.

As an example, let's say that you have a git repository that has had a
file called "A" some time in the past. That file gets renamed to B, and
then gets renamed back again to A. The old "git-rev-list" would show two
commits: the commit that renames B to A (because it changes A) _and_ as
its parent the commit that renames A to B (because it changes A).

With the new --remove-empty flag, git-rev-list will show just the commit
that renames B to A as the "root" commit, and stop traversal there
(because that's what you want for "annotate" - you want to stop there, and
for every "root" commit you then separately see if it really is a new
file, or if the paths history disappeared because it was renamed from some
other file).

With this patch, you should be able to basically do a "poor mans 'git
annotate'" with a fairly simple loop:

	push("HEAD", "$filename")
	while (revision,filename = pop()) {
		for each i in $(git-rev-list --parents --remove-empty $revision -- "$filename")

		pseudo-parents($i) = git-rev-list parents for that line

		if (pseudo-parents($i) is non-empty) {
			show diff of $i against pseudo-parents
			continue
		}

		/* See if the _real_ parents of $i had a rename */
		parent($i) = real-parent($i)
		if (find-rename in $parent($i)->$i)
			push $parent($i), "old-name"
	}

which should be doable in perl or something (doing stacks in shell is just
too painful to be worth it, so I'm not going to do this).

Anybody want to try?

		Linus

This ports the "combined diff" to diff-files so that differences
to the working tree files since stage 2 and stage 3 are shown
the same way as combined diff output from diff-tree for the
merge commit would be shown if the current working tree files
are committed.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

It considered an otherwise unchanged line that had line removals
in front of it an interesting line, which caused hunks to have
one extra the trailing context line.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Earlier round showed the commit log header and "diff --combined"
header even for paths that had no interesting hunk under --cc
flag.  Move the header display logic around to squelch them.
With this, a merge that does not have any interesting merges
will not be shown with --cc option, unless -m is used at the
same time.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Santi Bejar points out that a hunk that changes from all the
same common parents except one is uninteresting.  The earlier
round marked changes from only one parent uninteresting, but
this also marks hunks that have the same change from all but one
parent uninteresting, which is a natural extension of the
original idea to Octopus merges.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Remove extra whitespace between the change indicators and the
body text.  That is more in line with the uncombined unified
diff output (pointed out by Santi Bejar).

When showing --cc, say so instead of saying just --combined.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

... and use the established pattern of tail initialized to point
at the head pointer for an empty list, and updated to point at
the next pointer field of the item at the tail when appending.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Building on the previous '-c' (combined) option, '--cc' option
squelches the output further by omitting hunks that consist of
difference with solely one parent.
Signed-off-by: NJunio C Hamano <junkio@cox.net>