[PATCH v5/GSoC/MICRO] revision: forbid combining --graph and --no-walk

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Because "--graph" is about connected history while --no-walk
is about discrete points, it does not make sense to allow
giving these two options at the same time. [1]

This change makes a few calls to "show --graph" fail in
t4052, but asking to show one commit with graph is a
nonsensical thing to do. Thus, tests on "show --graph" in
t4052 have been removed. [2,3] Same tests on "show" without
--graph option have already been tested in 4052.

3 testcases have been added to test this patch.

[1]: http://article.gmane.org/gmane.comp.version-control.git/216083
[2]: http://article.gmane.org/gmane.comp.version-control.git/264950
[3]: http://article.gmane.org/gmane.comp.version-control.git/265107

Helped-By: Eric Sunshine <sunshine@xxxxxxxxxxxxxx>
Helped-By: René Scharfe <l.s.r@xxxxxx>
Helped-By: Junio C Hamano <gitster@xxxxxxxxx>
Signed-off-by: Dongcan Jiang <dongcan.jiang@xxxxxxxxx>
---
 Documentation/rev-list-options.txt |  2 ++
 revision.c                         |  2 ++
 t/t4052-stat-output.sh             | 14 +++++++-------
 t/t4202-log.sh                     |  4 ++++
 t/t6014-rev-list-all.sh            |  4 ++++
 t/t7007-show.sh                    |  4 ++++
 6 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt
index 4ed8587..136abdf 100644
--- a/Documentation/rev-list-options.txt
+++ b/Documentation/rev-list-options.txt
@@ -679,6 +679,7 @@ endif::git-rev-list[]
 	given on the command line. Otherwise (if `sorted` or no argument
 	was given), the commits are shown in reverse chronological order
 	by commit time.
+	Cannot be combined with `--graph`.
 
 --do-walk::
 	Overrides a previous `--no-walk`.
@@ -781,6 +782,7 @@ you would get an output like this:
 	on the left hand side of the output.  This may cause extra lines
 	to be printed in between commits, in order for the graph history
 	to be drawn properly.
+	Cannot be combined with `--no-walk`.
 +
 This enables parent rewriting, see 'History Simplification' below.
 +
diff --git a/revision.c b/revision.c
index 66520c6..6cd91dd 100644
--- a/revision.c
+++ b/revision.c
@@ -2339,6 +2339,8 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
 
 	if (revs->reflog_info && revs->graph)
 		die("cannot combine --walk-reflogs with --graph");
+	if (revs->no_walk && revs->graph)
+		die("cannot combine --no-walk with --graph");
 	if (!revs->reflog_info && revs->grep_filter.use_reflog_filter)
 		die("cannot use --grep-reflog without --walk-reflogs");
 
diff --git a/t/t4052-stat-output.sh b/t/t4052-stat-output.sh
index b68afef..54f10cf 100755
--- a/t/t4052-stat-output.sh
+++ b/t/t4052-stat-output.sh
@@ -99,7 +99,7 @@ do
 		test_cmp "$expect" actual
 	'
 
-	test "$cmd" != diff || continue
+	test "$cmd" != diff && test "$cmd" != show || continue
 
 	test_expect_success "$cmd --graph $verb COLUMNS (big change)" '
 		COLUMNS=200 git $cmd $args --graph >output
@@ -127,7 +127,7 @@ do
 		test_cmp "$expect" actual
 	'
 
-	test "$cmd" != diff || continue
+	test "$cmd" != diff && test "$cmd" != show || continue
 
 	test_expect_success "$cmd --graph $verb not enough COLUMNS (big change)" '
 		COLUMNS=40 git $cmd $args --graph >output
@@ -155,7 +155,7 @@ do
 		test_cmp "$expect" actual
 	'
 
-	test "$cmd" != diff || continue
+	test "$cmd" != diff && test "$cmd" != show || continue
 
 	test_expect_success "$cmd --graph $verb statGraphWidth config" '
 		git -c diff.statGraphWidth=26 $cmd $args --graph >output
@@ -196,7 +196,7 @@ do
 		test_cmp expect actual
 	'
 
-	test "$cmd" != diff || continue
+	test "$cmd" != diff && test "$cmd" != show || continue
 
 	test_expect_success "$cmd --stat-width=width --graph with big change" '
 		git $cmd $args --stat-width=40 --graph >output
@@ -236,7 +236,7 @@ do
 		test_cmp expect actual
 	'
 
-	test "$cmd" != diff || continue
+	test "$cmd" != diff && test "$cmd" != show || continue
 
 	test_expect_success "$cmd --stat=width --graph with big change is balanced" '
 		git $cmd $args --stat-width=60 --graph >output &&
@@ -270,7 +270,7 @@ do
 		test_cmp "$expect" actual
 	'
 
-	test "$cmd" != diff || continue
+	test "$cmd" != diff && test "$cmd" != show || continue
 
 	test_expect_success "$cmd --graph $verb COLUMNS (long filename)" '
 		COLUMNS=200 git $cmd $args --graph >output
@@ -299,7 +299,7 @@ do
 		test_cmp "$expect" actual
 	'
 
-	test "$cmd" != diff || continue
+	test "$cmd" != diff && test "$cmd" != show || continue
 
 	test_expect_success COLUMNS_CAN_BE_1 \
 		"$cmd --graph $verb prefix greater than COLUMNS (big change)" '
diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index 5f2b290..f111705 100755
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -887,4 +887,8 @@ test_expect_success GPG 'log --graph --show-signature for merged tag' '
 	grep "^| | gpg: Good signature" actual
 '
 
+test_expect_success 'log --graph --no-walk is forbidden' '
+	test_must_fail git log --graph --no-walk
+'
+
 test_done
diff --git a/t/t6014-rev-list-all.sh b/t/t6014-rev-list-all.sh
index 991ab4a..c9bedd2 100755
--- a/t/t6014-rev-list-all.sh
+++ b/t/t6014-rev-list-all.sh
@@ -35,4 +35,8 @@ test_expect_success 'repack does not lose detached HEAD' '
 
 '
 
+test_expect_success 'rev-list --graph --no-walk is forbidden' '
+	test_must_fail git rev-list --graph --no-walk HEAD
+'
+
 test_done
diff --git a/t/t7007-show.sh b/t/t7007-show.sh
index 1b824fe..42d3db6 100755
--- a/t/t7007-show.sh
+++ b/t/t7007-show.sh
@@ -124,4 +124,8 @@ test_expect_success '--quiet suppresses diff' '
 	test_cmp expect actual
 '
 
+test_expect_success 'show --graph is forbidden' '
+  test_must_fail git show --graph HEAD
+'
+
 test_done
-- 
2.3.2.224.g6c2f212

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