user/sven/git.git/diff.h, branch v1.5.4.4

add a "basic" diff config callback

2008-01-05T00:05:23Z

The diff porcelain uses git_diff_ui_config to set porcelain-ish config options, like automatically turning on color. The plumbing specifically avoids calling this function, since it doesn't want things like automatic color or rename detection. However, some diff options should be set for both plumbing and porcelain. For example, one can still turn on color in git-diff-files using the --color command line option. This means we want the color config from color.diff.* (so that once color is on, we use the user's preferred scheme), but _not_ the color.diff variable. We split the diff config into "ui" and "basic", where "basic" is suitable for use by plumbing (so _most_ things affecting the output should still go into the "ui" part). Signed-off-by: Jeff King Signed-off-by: Junio C Hamano

Teach diff machinery to display other prefixes than "a/" and "b/"

2007-12-20T09:10:39Z

With the new options "--src-prefix=", "--dst-prefix=" and "--no-prefix", you can now control the path prefixes of the diff machinery. These used to by hardwired to "a/" for the source prefix and "b/" for the destination prefix. Initial patch by Pascal Obry. Sane option names suggested by Linus. Signed-off-by: Johannes Schindelin Acked-by: Linus Torvalds Signed-off-by: Junio C Hamano

diff --check: minor fixups

2007-12-14T07:40:27Z

There is no reason --exit-code and --check-diff must be mutually exclusive, so assign different bits to different results and allow them to be returned from the command. Introduce diff_result_code() to factor out the common code to decide final status code based on diffopt settings and use it everywhere. Update tests to match the above fix. Turning pager off when "diff --check" is used is a regression. Signed-off-by: Junio C Hamano

"diff --check" should affect exit status

2007-12-14T07:05:42Z

"git diff" has a --check option that can be used to check for whitespace problems but it only reported by printing warnings to the console. Now when the --check option is used we give a non-zero exit status, making "git diff --check" nicer to use in scripts and hooks. Signed-off-by: Wincent Colaiuta Signed-off-by: Junio C Hamano

Merge branch 'ph/diffopts'

2007-11-18T23:50:16Z

* ph/diffopts: Reorder diff_opt_parse options more logically per topics. Make the diff_options bitfields be an unsigned with explicit masks. Use OPT_BIT in builtin-pack-refs Use OPT_BIT in builtin-for-each-ref Use OPT_SET_INT and OPT_BIT in builtin-branch parse-options new features.

Make the diff_options bitfields be an unsigned with explicit masks.

2007-11-12T00:54:15Z

reverse_diff was a bit-value in disguise, it's merged in the flags now. Signed-off-by: Pierre Habouzit Signed-off-by: Junio C Hamano

git-add: make the entry stat-clean after re-adding the same contents

2007-11-10T08:37:39Z

Earlier in commit 0781b8a9b2fe760fc4ed519a3a26e4b9bd6ccffe (add_file_to_index: skip rehashing if the cached stat already matches), add_file_to_index() were taught not to re-add the path if it already matches the index. The change meant well, but was not executed quite right. It used ie_modified() to see if the file on the work tree is really different from the index, and skipped adding the contents if the function says "not modified". This was wrong. There are three possible comparison results between the index and the file in the work tree: - with lstat(2) we _know_ they are different. E.g. if the length or the owner in the cached stat information is different from the length we just obtained from lstat(2), we can tell the file is modified without looking at the actual contents. - with lstat(2) we _know_ they are the same. The same length, the same owner, the same everything (but this has a twist, as described below). - we cannot tell from lstat(2) information alone and need to go to the filesystem to actually compare. The last case arises from what we call 'racy git' situation, that can be caused with this sequence: $ echo hello >file $ git add file $ echo aeiou >file ;# the same length If the second "echo" is done within the same filesystem timestamp granularity as the first "echo", then the timestamp recorded by "git add" and the timestamp we get from lstat(2) will be the same, and we can mistakenly say the file is not modified. The path is called 'racily clean'. We need to reliably detect racily clean paths are in fact modified. To solve this problem, when we write out the index, we mark the index entry that has the same timestamp as the index file itself (that is the time from the point of view of the filesystem) to tell any later code that does the lstat(2) comparison not to trust the cached stat info, and ie_modified() then actually goes to the filesystem to compare the contents for such a path. That's all good, but it should not be used for this "git add" optimization, as the goal of "git add" is to actually update the path in the index and make it stat-clean. With the false optimization, we did _not_ cause any data loss (after all, what we failed to do was only to update the cached stat information), but it made the following sequence leave the file stat dirty: $ echo hello >file $ git add file $ echo hello >file ;# the same contents $ git add file The solution is not to use ie_modified() which goes to the filesystem to see if it is really clean, but instead use ie_match_stat() with "assume racily clean paths are dirty" option, to force re-adding of such a path. There was another problem with "git add -u". The codepath shares the same issue when adding the paths that are found to be modified, but in addition, it asked "git diff-files" machinery run_diff_files() function (which is "git diff-files") to list the paths that are modified. But "git diff-files" machinery uses the same ie_modified() call so that it does not report racily clean _and_ actually clean paths as modified, which is not what we want. The patch allows the callers of run_diff_files() to pass the same "assume racily clean paths are dirty" option, and makes "git-add -u" codepath to use that option, to discover and re-add racily clean _and_ actually clean paths. We could further optimize on top of this patch to differentiate the case where the path really needs re-adding (i.e. the content of the racily clean entry was indeed different) and the case where only the cached stat information needs to be refreshed (i.e. the racily clean entry was actually clean), but I do not think it is worth it. This patch applies to maint and all the way up. Signed-off-by: Junio C Hamano

ce_match_stat, run_diff_files: use symbolic constants for readability

2007-11-10T08:24:51Z

ce_match_stat() can be told: (1) to ignore CE_VALID bit (used under "assume unchanged" mode) and perform the stat comparison anyway; (2) not to perform the contents comparison for racily clean entries and report mismatch of cached stat information; using its "option" parameter. Give them symbolic constants. Similarly, run_diff_files() can be told not to report anything on removed paths. Also give it a symbolic constant for that. Signed-off-by: Junio C Hamano

diff: squelch empty diffs even more

2007-08-15T05:34:58Z

When we compare two non-tracked files, or explicitly specify --no-index, the suggestion to run git-status is not helpful. The patch adds a new diff_options bitfield member, no_index, that is used instead of the special value of -2 of the rev_info field max_count to indicate that the index is not to be used. This makes it possible to pass that flag down to diffcore_skip_stat_unmatch(), which only has one diff_options parameter. This could even become a cleanup if we removed all assignments of max_count to a value of -2 (viz. replacement of a magic value with a self-documenting field name) but I didn't dare to do that so late in the rc game.. The no_index bit, if set, then tells diffcore_skip_stat_unmatch() to not account for any skipped stat-mismatches, which avoids the suggestion to run git-status. Signed-off-by: Rene Scharfe Signed-off-by: Junio C Hamano

git-diff: squelch "empty" diffs

2007-08-14T08:55:00Z

After starting to edit a working tree file but later when your edit ends up identical to the original (this can also happen when you ran a wholesale regexp replace with something like "perl -i" that does not actually modify many of the paths), "git diff" between the index and the working tree outputs many "empty" diffs that show "diff --git" headers and nothing else, because these paths are stat-dirty. While it was a way to warn the user that the earlier action of the user made the index ineffective as an optimization mechanism, it was felt too loud for the purpose of warning even to experienced users, and also resulted in confusing people new to git. This replaces the "empty" diffs with a single warning message at the end. Having many such paths hurts performance, and you can run "git-update-index --refresh" to update the lstat(2) information recorded in the index in such a case. "git-status" does so as a side effect, and that is more familiar to the end-user, so we recommend it to them. The change affects only "git diff" that outputs patch text, because that is where the annoyance of too many "empty" diff is most strongly felt, and because the warning message can be safely ignored by downstream tools without getting mistaken as part of the patch. For the low-level "git diff-files" and "git diff-index", the traditional behaviour is retained. Signed-off-by: Junio C Hamano