Merge branch 'master' into jc/diff

* master:
  Make "--parents" logs also be incremental
  Retire diffcore-pathspec.
  Improve the git-diff-tree -c/-cc documentation

10 files changed, 45 insertions, 108 deletions

diff --git a/Documentation/git-diff-tree.txt b/Documentation/git-diff-tree.txt
index 9153e4cf2..216916985 100644
--- a/Documentation/git-diff-tree.txt
+++ b/Documentation/git-diff-tree.txt
@@ -60,7 +60,8 @@ separated with a single space are given.
 -m::
 	By default, "git-diff-tree --stdin" does not show
 	differences for merge commits.  With this flag, it shows
-	differences to that commit from all of its parents.
+	differences to that commit from all of its parents. See
+	also '-c'.
 
 -s::
 	By default, "git-diff-tree --stdin" shows differences,
@@ -81,19 +82,25 @@ separated with a single space are given.
 	git-diff-tree outputs a line with the commit ID when
 	applicable.  This flag suppressed the commit ID output.
 
--c,--cc::
-	These flags change the way a merge commit is displayed
+-c::
+	This flag changes the way a merge commit is displayed
 	(which means it is useful only when the command is given
 	one <tree-ish>, or '--stdin').  It shows the differences
-	from each of the parents to the merge result
-	simultaneously, instead of showing pairwise diff between
-	a parent and the result one at a time, which '-m' option
-	output does.  '--cc' further compresses the output by
-	omiting hunks that show differences from only one
+	from each of the parents to the merge result simultaneously
+	instead of showing pairwise diff between a parent and the
+	result one at a time (which is what the '-m' option does).
+	Furthermore, it lists only files which were modified
+	from all parents.
+
+-cc::
+	This flag changes the way a merge commit patch is displayed,
+	in a similar way to the '-c' option. It implies the '-c'
+	and '-p' options and further compresses the patch output
+	by omitting hunks that show differences from only one
 	parent, or show the same change from all but one parent
 	for an Octopus merge.  When this optimization makes all
 	hunks disappear, the commit itself and the commit log
-	message is not shown, just like any other "empty diff" cases.
+	message is not shown, just like in any other "empty diff" case.
 
 --always::
 	Show the commit itself and the commit log message even
diff --git a/Makefile b/Makefile
index b2721469a..34a8c14d5 100644
--- a/Makefile
+++ b/Makefile
@@ -197,7 +197,7 @@ LIB_H = \
 	tree-walk.h log-tree.h
 
 DIFF_OBJS = \
-	diff.o diffcore-break.o diffcore-order.o diffcore-pathspec.o \
+	diff.o diffcore-break.o diffcore-order.o \
 	diffcore-pickaxe.o diffcore-rename.o tree-diff.o combine-diff.o \
 	diffcore-delta.o log-tree.o
 
diff --git a/diff-stages.c b/diff-stages.c
index 9968d6ce1..dcd20e79e 100644
--- a/diff-stages.c
+++ b/diff-stages.c
@@ -11,15 +11,17 @@ static const char diff_stages_usage[] =
 "git-diff-stages [<common diff options>] <stage1> <stage2> [<path>...]"
 COMMON_DIFF_OPTIONS_HELP;
 
-static void diff_stages(int stage1, int stage2)
+static void diff_stages(int stage1, int stage2, const char **pathspec)
 {
 	int i = 0;
 	while (i < active_nr) {
 		struct cache_entry *ce, *stages[4] = { NULL, };
 		struct cache_entry *one, *two;
 		const char *name;
-		int len;
+		int len, skip;
+
 		ce = active_cache[i];
+		skip = !ce_path_match(ce, pathspec);
 		len = ce_namelen(ce);
 		name = ce->name;
 		for (;;) {
@@ -34,7 +36,8 @@ static void diff_stages(int stage1, int stage2)
 		}
 		one = stages[stage1];
 		two = stages[stage2];
-		if (!one && !two)
+
+		if (skip || (!one && !two))
 			continue;
 		if (!one)
 			diff_addremove(&diff_options, '+', ntohl(two->ce_mode),
@@ -54,8 +57,8 @@ static void diff_stages(int stage1, int stage2)
 int main(int ac, const char **av)
 {
 	int stage1, stage2;
-
-	setup_git_directory();
+	const char *prefix = setup_git_directory();
+	const char **pathspec = NULL;
 
 	git_config(git_diff_config);
 	read_cache();
@@ -89,12 +92,12 @@ int main(int ac, const char **av)
 		usage(diff_stages_usage);
 
 	av += 3; /* The rest from av[0] are for paths restriction. */
-	diff_options.paths = av;
+	pathspec = get_pathspec(prefix, av);
 
 	if (diff_setup_done(&diff_options) < 0)
 		usage(diff_stages_usage);
 
-	diff_stages(stage1, stage2);
+	diff_stages(stage1, stage2, pathspec);
 	diffcore_std(&diff_options);
 	diff_flush(&diff_options);
 	return 0;
diff --git a/diff.c b/diff.c
index 30e4d50b9..2fa285a8e 100644
--- a/diff.c
+++ b/diff.c
@@ -1375,8 +1375,6 @@ static void diffcore_apply_filter(const char *filter)
 
 void diffcore_std(struct diff_options *options)
 {
-	if (options->paths && options->paths[0])
-		diffcore_pathspec(options->paths);
 	if (options->break_opt != -1)
 		diffcore_break(options->break_opt);
 	if (options->detect_rename)
diff --git a/diff.h b/diff.h
index 0cebec113..a02ef2820 100644
--- a/diff.h
+++ b/diff.h
@@ -20,7 +20,6 @@ typedef void (*add_remove_fn_t)(struct diff_options *options,
 		    const char *base, const char *path);
 
 struct diff_options {
-	const char **paths;
 	const char *filter;
 	const char *orderfile;
 	const char *pickaxe;
diff --git a/diffcore-pathspec.c b/diffcore-pathspec.c
deleted file mode 100644
index 139fe882f..000000000
--- a/diffcore-pathspec.c
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * Copyright (C) 2005 Junio C Hamano
- */
-#include "cache.h"
-#include "diff.h"
-#include "diffcore.h"
-
-struct path_spec {
-	const char *spec;
-	int len;
-};
-
-static int matches_pathspec(const char *name, struct path_spec *s, int cnt)
-{
-	int i;
-	int namelen;
-
-	if (cnt == 0)
-		return 1;
-
-	namelen = strlen(name);
-	for (i = 0; i < cnt; i++) {
-		int len = s[i].len;
-		if (namelen < len)
-			continue;
-		if (memcmp(s[i].spec, name, len))
-			continue;
-		if (s[i].spec[len-1] == '/' ||
-		    name[len] == 0 ||
-		    name[len] == '/')
-			return 1;
-		if (!len)
-			return 1;
-	}
-	return 0;
-}
-
-void diffcore_pathspec(const char **pathspec)
-{
-	struct diff_queue_struct *q = &diff_queued_diff;
-	int i, speccnt;
-	struct diff_queue_struct outq;
-	struct path_spec *spec;
-
-	outq.queue = NULL;
-	outq.nr = outq.alloc = 0;
-
-	for (i = 0; pathspec[i]; i++)
-		;
-	speccnt = i;
-	if (!speccnt)
-		return;
-
-	spec = xmalloc(sizeof(*spec) * speccnt);
-	for (i = 0; pathspec[i]; i++) {
-		spec[i].spec = pathspec[i];
-		spec[i].len = strlen(pathspec[i]);
-	}
-
-	for (i = 0; i < q->nr; i++) {
-		struct diff_filepair *p = q->queue[i];
-		if (matches_pathspec(p->two->path, spec, speccnt))
-			diff_q(&outq, p);
-		else
-			diff_free_filepair(p);
-	}
-	free(q->queue);
-	*q = outq;
-	return;
-}
diff --git a/http-push.c b/http-push.c
index b60fa8d24..57cefdea5 100644
--- a/http-push.c
+++ b/http-push.c
@@ -59,12 +59,12 @@ enum XML_Status {
 #define LOCK_TIME 600
 #define LOCK_REFRESH 30
 
-/* bits #0-4 in revision.h */
+/* bits #0-6 in revision.h */
 
-#define LOCAL    (1u << 5)
-#define REMOTE   (1u << 6)
-#define FETCHING (1u << 7)
-#define PUSHING  (1u << 8)
+#define LOCAL    (1u << 7)
+#define REMOTE   (1u << 8)
+#define FETCHING (1u << 9)
+#define PUSHING  (1u << 10)
 
 /* We allow "recursive" symbolic refs. Only within reason, though */
 #define MAXDEPTH 5
diff --git a/rev-list.c b/rev-list.c
index 130150262..359195b54 100644
--- a/rev-list.c
+++ b/rev-list.c
@@ -7,9 +7,9 @@
 #include "tree-walk.h"
 #include "revision.h"
 
-/* bits #0-5 in revision.h */
+/* bits #0-6 in revision.h */
 
-#define COUNTED		(1u<<6)
+#define COUNTED		(1u<<7)
 
 static const char rev_list_usage[] =
 "git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
diff --git a/revision.c b/revision.c
index ce35b5a7e..fe2656238 100644
--- a/revision.c
+++ b/revision.c
@@ -340,6 +340,10 @@ static void add_parents_to_list(struct rev_info *revs, struct commit *commit, st
 {
 	struct commit_list *parent = commit->parents;
 
+	if (commit->object.flags & ADDED)
+		return;
+	commit->object.flags |= ADDED;
+
 	/*
 	 * If the commit is uninteresting, don't try to
 	 * prune parents - we want the maximal uninteresting
@@ -705,13 +709,6 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
 	if (revs->prune_data) {
 		diff_tree_setup_paths(revs->prune_data);
 		revs->prune_fn = try_to_simplify_commit;
-
-		/*
-		 * If we fix up parent data, we currently cannot
-		 * do that on-the-fly.
-		 */
-		if (revs->parents)
-			revs->limited = 1;
 	}
 
 	return left;
@@ -728,10 +725,12 @@ void prepare_revision_walk(struct rev_info *revs)
 					     revs->topo_getter);
 }
 
-static int rewrite_one(struct commit **pp)
+static int rewrite_one(struct rev_info *revs, struct commit **pp)
 {
 	for (;;) {
 		struct commit *p = *pp;
+		if (!revs->limited)
+			add_parents_to_list(revs, p, &revs->commits);
 		if (p->object.flags & (TREECHANGE | UNINTERESTING))
 			return 0;
 		if (!p->parents)
@@ -740,12 +739,12 @@ static int rewrite_one(struct commit **pp)
 	}
 }
 
-static void rewrite_parents(struct commit *commit)
+static void rewrite_parents(struct rev_info *revs, struct commit *commit)
 {
 	struct commit_list **pp = &commit->parents;
 	while (*pp) {
 		struct commit_list *parent = *pp;
-		if (rewrite_one(&parent->item) < 0) {
+		if (rewrite_one(revs, &parent->item) < 0) {
 			*pp = parent->next;
 			continue;
 		}
@@ -802,7 +801,7 @@ struct commit *get_revision(struct rev_info *revs)
 			if (!(commit->object.flags & TREECHANGE))
 				continue;
 			if (revs->parents)
-				rewrite_parents(commit);
+				rewrite_parents(revs, commit);
 		}
 		commit->object.flags |= SHOWN;
 		return commit;
diff --git a/revision.h b/revision.h
index 0caeecf00..83d28d520 100644
--- a/revision.h
+++ b/revision.h
@@ -7,6 +7,7 @@
 #define SHOWN		(1u<<3)
 #define TMP_MARK	(1u<<4) /* for isolated cases; clean after use */
 #define BOUNDARY	(1u<<5)
+#define ADDED		(1u<<6)	/* Parents already parsed and added? */
 
 struct rev_info;