1 files changed, 288 insertions, 0 deletions
diff --git a/t/t6012-rev-list-simplify.sh b/t/t6012-rev-list-simplify.sh
new file mode 100755
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+++ b/t/t6012-rev-list-simplify.sh
@@ -0,0 +1,288 @@
+#!/bin/sh
+
+test_description='merge simplification'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+note () {
+	git tag "$1"
+}
+
+unnote () {
+	test_when_finished "rm -f tmp" &&
+	git name-rev --tags --annotate-stdin >tmp &&
+	sed -e "s|$OID_REGEX (tags/\([^)]*\)) |\1 |g" <tmp
+}
+
+#
+# Create a test repo with an interesting commit graph:
+#
+# A-----B-----G--H--I--K--L
+#  \     \      /     /
+#   \     \    /     /
+#    C--D--E--F     J
+#
+# The commits are laid out from left-to-right starting with
+# the root commit A and terminating at the tip commit L.
+#
+# There are a few places where we adjust the commit date or
+# author date to make the --topo-order, --date-order, and
+# --author-date-order flags produce different output.
+
+test_expect_success setup '
+	echo "Hi there" >file &&
+	echo "initial" >lost &&
+	git add file lost &&
+	test_tick && git commit -m "Initial file and lost" &&
+	note A &&
+
+	git branch other-branch &&
+
+	git symbolic-ref HEAD refs/heads/unrelated &&
+	git rm -f "*" &&
+	echo "Unrelated branch" >side &&
+	git add side &&
+	test_tick && git commit -m "Side root" &&
+	note J &&
+	git checkout main &&
+
+	echo "Hello" >file &&
+	echo "second" >lost &&
+	git add file lost &&
+	test_tick && GIT_AUTHOR_DATE=$(($test_tick + 120)) git commit -m "Modified file and lost" &&
+	note B &&
+
+	git checkout other-branch &&
+
+	echo "Hello" >file &&
+	>lost &&
+	git add file lost &&
+	test_tick && git commit -m "Modified the file identically" &&
+	note C &&
+
+	echo "This is a stupid example" >another-file &&
+	git add another-file &&
+	test_tick && git commit -m "Add another file" &&
+	note D &&
+
+	test_tick &&
+	test_must_fail git merge -m "merge" main &&
+	>lost && git commit -a -m "merge" &&
+	note E &&
+
+	echo "Yet another" >elif &&
+	git add elif &&
+	test_tick && git commit -m "Irrelevant change" &&
+	note F &&
+
+	git checkout main &&
+	echo "Yet another" >elif &&
+	git add elif &&
+	test_tick && git commit -m "Another irrelevant change" &&
+	note G &&
+
+	test_tick && git merge -m "merge" other-branch &&
+	note H &&
+
+	echo "Final change" >file &&
+	test_tick && git commit -a -m "Final change" &&
+	note I &&
+
+	git checkout main &&
+	test_tick && git merge --allow-unrelated-histories -m "Coolest" unrelated &&
+	note K &&
+
+	echo "Immaterial" >elif &&
+	git add elif &&
+	test_tick && git commit -m "Last" &&
+	note L
+'
+
+FMT='tformat:%P 	%H | %s'
+
+check_outcome () {
+	outcome=$1
+	shift
+	for c in $1
+	do
+		echo "$c"
+	done >expect &&
+	shift &&
+	param="$*" &&
+	test_expect_$outcome "log $param" '
+		git log --pretty="$FMT" --parents $param >out &&
+		unnote >actual <out &&
+		sed -e "s/^.*	\([^ ]*\) .*/\1/" >check <actual &&
+		test_cmp expect check
+	'
+}
+
+check_result () {
+	check_outcome success "$@"
+}
+
+check_result 'L K J I H F E D C G B A' --full-history --topo-order
+check_result 'L K I H G F E D C B J A' --full-history
+check_result 'L K I H G F E D C B J A' --full-history --date-order
+check_result 'L K I H G F E D B C J A' --full-history --author-date-order
+check_result 'K I H E C B A' --full-history -- file
+check_result 'K I H E C B A' --full-history --topo-order -- file
+check_result 'K I H E C B A' --full-history --date-order -- file
+check_result 'K I H E B C A' --full-history --author-date-order -- file
+check_result 'I E C B A' --simplify-merges -- file
+check_result 'I E C B A' --simplify-merges --topo-order -- file
+check_result 'I E C B A' --simplify-merges --date-order -- file
+check_result 'I E B C A' --simplify-merges --author-date-order -- file
+check_result 'I B A' -- file
+check_result 'I B A' --topo-order -- file
+check_result 'I B A' --date-order -- file
+check_result 'I B A' --author-date-order -- file
+check_result 'H' --first-parent -- another-file
+check_result 'H' --first-parent --topo-order -- another-file
+
+check_result 'L K I H G B A' --first-parent L
+check_result 'F E D C' --exclude-first-parent-only F ^L
+check_result '' F ^L
+check_result 'L K I H G J' L ^F
+check_result 'L K I H G B J' --exclude-first-parent-only L ^F
+check_result 'L K I H G B' --exclude-first-parent-only --first-parent L ^F
+
+check_result 'E C B A' --full-history E -- lost
+test_expect_success 'full history simplification without parent' '
+	printf "%s\n" E C B A >expect &&
+	git log --pretty="$FMT" --full-history E -- lost >out &&
+	unnote >actual <out &&
+	sed -e "s/^.*	\([^ ]*\) .*/\1/" >check <actual &&
+	test_cmp expect check
+'
+
+test_expect_success '--full-diff is not affected by --parents' '
+	git log -p --pretty="%H" --full-diff -- file >expected &&
+	git log -p --pretty="%H" --full-diff --parents -- file >actual &&
+	test_cmp expected actual
+'
+
+#
+# Create a new history to demonstrate the value of --show-pulls
+# with respect to the subtleties of simplified history, --full-history,
+# and --simplify-merges.
+#
+#   .-A---M-----C--N---O---P
+#  /     / \  \  \/   /   /
+# I     B   \  R-'`-Z'   /
+#  \   /     \/         /
+#   \ /      /\        /
+#    `---X--'  `---Y--'
+#
+# This example is explained in Documentation/rev-list-options.txt
+
+test_expect_success 'setup rebuild repo' '
+	rm -rf .git * &&
+	git init &&
+	git switch -c topic &&
+
+	echo base >file &&
+	git add file &&
+	test_commit I &&
+
+	echo A >file &&
+	git add file &&
+	test_commit A &&
+
+	git switch -c branchB I &&
+	echo B >file &&
+	git add file &&
+	test_commit B &&
+
+	git switch topic &&
+	test_must_fail git merge -m "M" B &&
+	echo A >file &&
+	echo B >>file &&
+	git add file &&
+	git merge --continue &&
+	note M &&
+
+	echo C >other &&
+	git add other &&
+	test_commit C &&
+
+	git switch -c branchX I &&
+	echo X >file &&
+	git add file &&
+	test_commit X &&
+
+	git switch -c branchR M &&
+	git merge -m R -Xtheirs X &&
+	note R &&
+
+	git switch topic &&
+	git merge -m N R &&
+	note N &&
+
+	git switch -c branchY M &&
+	echo Y >y &&
+	git add y &&
+	test_commit Y &&
+
+	git switch -c branchZ C &&
+	echo Z >z &&
+	git add z &&
+	test_commit Z &&
+
+	git switch topic &&
+	git merge -m O Z &&
+	note O &&
+
+	git merge -m P Y &&
+	note P
+'
+
+check_result 'X I' -- file
+check_result 'N R X I' --show-pulls -- file
+
+check_result 'P O N R X M B A I' --full-history --topo-order -- file
+check_result 'N R X M B A I' --simplify-merges --topo-order --show-pulls -- file
+check_result 'R X M B A I' --simplify-merges --topo-order -- file
+check_result 'N M A I' --first-parent -- file
+check_result 'N M A I' --first-parent --show-pulls -- file
+
+# --ancestry-path implies --full-history
+check_result 'P O N R M' --topo-order \
+	--ancestry-path A..HEAD -- file
+check_result 'P O N R M' --topo-order \
+	--show-pulls \
+	--ancestry-path A..HEAD -- file
+check_result 'P O N R M' --topo-order \
+	--full-history \
+	--ancestry-path A..HEAD -- file
+check_result 'R M' --topo-order \
+	--simplify-merges \
+	--ancestry-path A..HEAD -- file
+check_result 'N R M' --topo-order \
+	--simplify-merges --show-pulls \
+	--ancestry-path A..HEAD -- file
+
+test_expect_success 'log --graph --simplify-merges --show-pulls' '
+	cat >expect <<-\EOF &&
+	* N
+	*   R
+	|\  
+	| * X
+	* |   M
+	|\ \  
+	| * | B
+	| |/  
+	* / A
+	|/  
+	* I
+	EOF
+	git log --graph --pretty="%s" \
+		--simplify-merges --show-pulls \
+		-- file >actual &&
+	test_cmp expect actual
+'
+
+test_done