git/t/t4015-diff-whitespace.sh

#!/bin/sh
#
# Copyright (c) 2006 Johannes E. Schindelin
#

test_description='Test special whitespace in diff engine.

'
. ./test-lib.sh
. "$TEST_DIRECTORY"/diff-lib.sh

# Ray Lehtiniemi's example

cat << EOF > x
do {
   nothing;
} while (0);
EOF

git update-index --add x

cat << EOF > x
do
{
   nothing;
}
while (0);
EOF

cat << EOF > expect
diff --git a/x b/x
index adf3937..6edc172 100644
--- a/x
+++ b/x
@@ -1,3 +1,5 @@
-do {
+do
+{
    nothing;
-} while (0);
+}
+while (0);
EOF

git diff > out
test_expect_success "Ray's example without options" 'test_cmp expect out'

git diff -w > out
test_expect_success "Ray's example with -w" 'test_cmp expect out'

git diff -b > out
test_expect_success "Ray's example with -b" 'test_cmp expect out'

tr 'Q' '\015' << EOF > x
whitespace at beginning
whitespace change
whitespace in the middle
whitespace at end
unchanged line
CR at endQ
EOF

git update-index x

tr '_' ' ' << EOF > x
	whitespace at beginning
whitespace 	 change
white space in the middle
whitespace at end__
unchanged line
CR at end
EOF

tr 'Q_' '\015 ' << EOF > expect
diff --git a/x b/x
index d99af23..8b32fb5 100644
--- a/x
+++ b/x
@@ -1,6 +1,6 @@
-whitespace at beginning
-whitespace change
-whitespace in the middle
-whitespace at end
+	whitespace at beginning
+whitespace 	 change
+white space in the middle
+whitespace at end__
 unchanged line
-CR at endQ
+CR at end
EOF
git diff > out
test_expect_success 'another test, without options' 'test_cmp expect out'

cat << EOF > expect
EOF
git diff -w > out
test_expect_success 'another test, with -w' 'test_cmp expect out'
git diff -w -b > out
test_expect_success 'another test, with -w -b' 'test_cmp expect out'
git diff -w --ignore-space-at-eol > out
test_expect_success 'another test, with -w --ignore-space-at-eol' 'test_cmp expect out'
git diff -w -b --ignore-space-at-eol > out
test_expect_success 'another test, with -w -b --ignore-space-at-eol' 'test_cmp expect out'

tr 'Q_' '\015 ' << EOF > expect
diff --git a/x b/x
index d99af23..8b32fb5 100644
--- a/x
+++ b/x
@@ -1,6 +1,6 @@
-whitespace at beginning
+	whitespace at beginning
 whitespace 	 change
-whitespace in the middle
+white space in the middle
 whitespace at end__
 unchanged line
 CR at end
EOF
git diff -b > out
test_expect_success 'another test, with -b' 'test_cmp expect out'
git diff -b --ignore-space-at-eol > out
test_expect_success 'another test, with -b --ignore-space-at-eol' 'test_cmp expect out'

tr 'Q_' '\015 ' << EOF > expect
diff --git a/x b/x
index d99af23..8b32fb5 100644
--- a/x
+++ b/x
@@ -1,6 +1,6 @@
-whitespace at beginning
-whitespace change
-whitespace in the middle
+	whitespace at beginning
+whitespace 	 change
+white space in the middle
 whitespace at end__
 unchanged line
 CR at end
EOF
git diff --ignore-space-at-eol > out
test_expect_success 'another test, with --ignore-space-at-eol' 'test_cmp expect out'

test_expect_success 'ignore-blank-lines: only new lines' '
	test_seq 5 >x &&
	git update-index x &&
	test_seq 5 | sed "/3/i\\
" >x &&
	git diff --ignore-blank-lines >out &&
	>expect &&
	test_cmp out expect
'

test_expect_success 'ignore-blank-lines: only new lines with space' '
	test_seq 5 >x &&
	git update-index x &&
	test_seq 5 | sed "/3/i\\
 " >x &&
	git diff -w --ignore-blank-lines >out &&
	>expect &&
	test_cmp out expect
'

test_expect_success 'ignore-blank-lines: after change' '
	cat <<-\EOF >x &&
	1
	2

	3
	4
	5

	6
	7
	EOF
	git update-index x &&
	cat <<-\EOF >x &&
	change

	1
	2
	3
	4
	5
	6

	7
	EOF
	git diff --inter-hunk-context=100 --ignore-blank-lines >out.tmp &&
	cat <<-\EOF >expected &&
	diff --git a/x b/x
	--- a/x
	+++ b/x
	@@ -1,6 +1,7 @@
	+change
	+
	 1
	 2
	-
	 3
	 4
	 5
	EOF
	compare_diff_patch expected out.tmp
'

test_expect_success 'ignore-blank-lines: before change' '
	cat <<-\EOF >x &&
	1
	2

	3
	4
	5
	6
	7
	EOF
	git update-index x &&
	cat <<-\EOF >x &&

	1
	2
	3
	4
	5

	6
	7
	change
	EOF
	git diff --inter-hunk-context=100 --ignore-blank-lines >out.tmp &&
	cat <<-\EOF >expected &&
	diff --git a/x b/x
	--- a/x
	+++ b/x
	@@ -4,5 +4,7 @@
	 3
	 4
	 5
	+
	 6
	 7
	+change
	EOF
	compare_diff_patch expected out.tmp
'

test_expect_success 'ignore-blank-lines: between changes' '
	cat <<-\EOF >x &&
	1
	2
	3
	4
	5


	6
	7
	8
	9
	10
	EOF
	git update-index x &&
	cat <<-\EOF >x &&
	change
	1
	2

	3
	4
	5
	6
	7
	8

	9
	10
	change
	EOF
	git diff --ignore-blank-lines >out.tmp &&
	cat <<-\EOF >expected &&
	diff --git a/x b/x
	--- a/x
	+++ b/x
	@@ -1,5 +1,7 @@
	+change
	 1
	 2
	+
	 3
	 4
	 5
	@@ -8,5 +8,7 @@
	 6
	 7
	 8
	+
	 9
	 10
	+change
	EOF
	compare_diff_patch expected out.tmp
'

test_expect_success 'ignore-blank-lines: between changes (with interhunkctx)' '
	test_seq 10 >x &&
	git update-index x &&
	cat <<-\EOF >x &&
	change
	1
	2

	3
	4
	5

	6
	7
	8
	9

	10
	change
	EOF
	git diff --inter-hunk-context=2 --ignore-blank-lines >out.tmp &&
	cat <<-\EOF >expected &&
	diff --git a/x b/x
	--- a/x
	+++ b/x
	@@ -1,10 +1,15 @@
	+change
	 1
	 2
	+
	 3
	 4
	 5
	+
	 6
	 7
	 8
	 9
	+
	 10
	+change
	EOF
	compare_diff_patch expected out.tmp
'

test_expect_success 'ignore-blank-lines: scattered spaces' '
	test_seq 10 >x &&
	git update-index x &&
	cat <<-\EOF >x &&
	change
	1
	2
	3

	4

	5

	6


	7

	8
	9
	10
	change
	EOF
	git diff --inter-hunk-context=4 --ignore-blank-lines >out.tmp &&
	cat <<-\EOF >expected &&
	diff --git a/x b/x
	--- a/x
	+++ b/x
	@@ -1,3 +1,4 @@
	+change
	 1
	 2
	 3
	@@ -8,3 +15,4 @@
	 8
	 9
	 10
	+change
	EOF
	compare_diff_patch expected out.tmp
'

test_expect_success 'ignore-blank-lines: spaces coalesce' '
	test_seq 6 >x &&
	git update-index x &&
	cat <<-\EOF >x &&
	change
	1
	2
	3

	4

	5

	6
	change
	EOF
	git diff --inter-hunk-context=4 --ignore-blank-lines >out.tmp &&
	cat <<-\EOF >expected &&
	diff --git a/x b/x
	--- a/x
	+++ b/x
	@@ -1,6 +1,11 @@
	+change
	 1
	 2
	 3
	+
	 4
	+
	 5
	+
	 6
	+change
	EOF
	compare_diff_patch expected out.tmp
'

test_expect_success 'ignore-blank-lines: mix changes and blank lines' '
	test_seq 16 >x &&
	git update-index x &&
	cat <<-\EOF >x &&
	change
	1
	2

	3
	4
	5
	change
	6
	7
	8

	9
	10
	11
	change
	12
	13
	14

	15
	16
	change
	EOF
	git diff --ignore-blank-lines >out.tmp &&
	cat <<-\EOF >expected &&
	diff --git a/x b/x
	--- a/x
	+++ b/x
	@@ -1,8 +1,11 @@
	+change
	 1
	 2
	+
	 3
	 4
	 5
	+change
	 6
	 7
	 8
	@@ -9,8 +13,11 @@
	 9
	 10
	 11
	+change
	 12
	 13
	 14
	+
	 15
	 16
	+change
	EOF
	compare_diff_patch expected out.tmp
'

test_expect_success 'check mixed spaces and tabs in indent' '

	# This is indented with SP HT SP.
	echo " 	 foo();" > x &&
	git diff --check | grep "space before tab in indent"

'

test_expect_success 'check mixed tabs and spaces in indent' '

	# This is indented with HT SP HT.
	echo "	 	foo();" > x &&
	git diff --check | grep "space before tab in indent"

'

test_expect_success 'check with no whitespace errors' '

	git commit -m "snapshot" &&
	echo "foo();" > x &&
	git diff --check

'

test_expect_success 'check with trailing whitespace' '

	echo "foo(); " > x &&
	test_must_fail git diff --check

'

test_expect_success 'check with space before tab in indent' '

	# indent has space followed by hard tab
	echo " 	foo();" > x &&
	test_must_fail git diff --check

'

test_expect_success '--check and --exit-code are not exclusive' '

	git checkout x &&
	git diff --check --exit-code

'

test_expect_success '--check and --quiet are not exclusive' '

	git diff --check --quiet

'

test_expect_success 'check staged with no whitespace errors' '

	echo "foo();" > x &&
	git add x &&
	git diff --cached --check

'

test_expect_success 'check staged with trailing whitespace' '

	echo "foo(); " > x &&
	git add x &&
	test_must_fail git diff --cached --check

'

test_expect_success 'check staged with space before tab in indent' '

	# indent has space followed by hard tab
	echo " 	foo();" > x &&
	git add x &&
	test_must_fail git diff --cached --check

'

test_expect_success 'check with no whitespace errors (diff-index)' '

	echo "foo();" > x &&
	git add x &&
	git diff-index --check HEAD

'

test_expect_success 'check with trailing whitespace (diff-index)' '

	echo "foo(); " > x &&
	git add x &&
	test_must_fail git diff-index --check HEAD

'

test_expect_success 'check with space before tab in indent (diff-index)' '

	# indent has space followed by hard tab
	echo " 	foo();" > x &&
	git add x &&
	test_must_fail git diff-index --check HEAD

'

test_expect_success 'check staged with no whitespace errors (diff-index)' '

	echo "foo();" > x &&
	git add x &&
	git diff-index --cached --check HEAD

'

test_expect_success 'check staged with trailing whitespace (diff-index)' '

	echo "foo(); " > x &&
	git add x &&
	test_must_fail git diff-index --cached --check HEAD

'

test_expect_success 'check staged with space before tab in indent (diff-index)' '

	# indent has space followed by hard tab
	echo " 	foo();" > x &&
	git add x &&
	test_must_fail git diff-index --cached --check HEAD

'

test_expect_success 'check with no whitespace errors (diff-tree)' '

	echo "foo();" > x &&
	git commit -m "new commit" x &&
	git diff-tree --check HEAD^ HEAD

'

test_expect_success 'check with trailing whitespace (diff-tree)' '

	echo "foo(); " > x &&
	git commit -m "another commit" x &&
	test_must_fail git diff-tree --check HEAD^ HEAD

'

test_expect_success 'check with space before tab in indent (diff-tree)' '

	# indent has space followed by hard tab
	echo " 	foo();" > x &&
	git commit -m "yet another" x &&
	test_must_fail git diff-tree --check HEAD^ HEAD

'

test_expect_success 'check trailing whitespace (trailing-space: off)' '

	git config core.whitespace "-trailing-space" &&
	echo "foo ();   " > x &&
	git diff --check

'

test_expect_success 'check trailing whitespace (trailing-space: on)' '

	git config core.whitespace "trailing-space" &&
	echo "foo ();   " > x &&
	test_must_fail git diff --check

'

test_expect_success 'check space before tab in indent (space-before-tab: off)' '

	# indent contains space followed by HT
	git config core.whitespace "-space-before-tab" &&
	echo " 	foo ();" > x &&
	git diff --check

'

test_expect_success 'check space before tab in indent (space-before-tab: on)' '

	# indent contains space followed by HT
	git config core.whitespace "space-before-tab" &&
	echo " 	foo ();   " > x &&
	test_must_fail git diff --check

'

test_expect_success 'check spaces as indentation (indent-with-non-tab: off)' '

	git config core.whitespace "-indent-with-non-tab" &&
	echo "        foo ();" > x &&
	git diff --check

'

test_expect_success 'check spaces as indentation (indent-with-non-tab: on)' '

	git config core.whitespace "indent-with-non-tab" &&
	echo "        foo ();" > x &&
	test_must_fail git diff --check

'

test_expect_success 'ditto, but tabwidth=9' '

	git config core.whitespace "indent-with-non-tab,tabwidth=9" &&
	git diff --check

'

test_expect_success 'check tabs and spaces as indentation (indent-with-non-tab: on)' '

	git config core.whitespace "indent-with-non-tab" &&
	echo "	                foo ();" > x &&
	test_must_fail git diff --check

'

test_expect_success 'ditto, but tabwidth=10' '

	git config core.whitespace "indent-with-non-tab,tabwidth=10" &&
	test_must_fail git diff --check

'

test_expect_success 'ditto, but tabwidth=20' '

	git config core.whitespace "indent-with-non-tab,tabwidth=20" &&
	git diff --check

'

test_expect_success 'check tabs as indentation (tab-in-indent: off)' '

	git config core.whitespace "-tab-in-indent" &&
	echo "	foo ();" > x &&
	git diff --check

'

test_expect_success 'check tabs as indentation (tab-in-indent: on)' '

	git config core.whitespace "tab-in-indent" &&
	echo "	foo ();" > x &&
	test_must_fail git diff --check

'

test_expect_success 'check tabs and spaces as indentation (tab-in-indent: on)' '

	git config core.whitespace "tab-in-indent" &&
	echo "	                foo ();" > x &&
	test_must_fail git diff --check

'

test_expect_success 'ditto, but tabwidth=1 (must be irrelevant)' '

	git config core.whitespace "tab-in-indent,tabwidth=1" &&
	test_must_fail git diff --check

'

test_expect_success 'check tab-in-indent and indent-with-non-tab conflict' '

	git config core.whitespace "tab-in-indent,indent-with-non-tab" &&
	echo "foo ();" > x &&
	test_must_fail git diff --check

'

test_expect_success 'check tab-in-indent excluded from wildcard whitespace attribute' '

	git config --unset core.whitespace &&
	echo "x whitespace" > .gitattributes &&
	echo "	  foo ();" > x &&
	git diff --check &&
	rm -f .gitattributes

'

test_expect_success 'line numbers in --check output are correct' '

	echo "" > x &&
	echo "foo(); " >> x &&
	git diff --check | grep "x:2:"

'

test_expect_success 'checkdiff detects new trailing blank lines (1)' '
	echo "foo();" >x &&
	echo "" >>x &&
	git diff --check | grep "new blank line"
'

test_expect_success 'checkdiff detects new trailing blank lines (2)' '
	{ echo a; echo b; echo; echo; } >x &&
	git add x &&
	{ echo a; echo; echo; echo; echo; } >x &&
	git diff --check | grep "new blank line"
'

test_expect_success 'checkdiff allows new blank lines' '
	git checkout x &&
	mv x y &&
	(
		echo "/* This is new */" &&
		echo "" &&
		cat y
	) >x &&
	git diff --check
'

cat <<EOF >expect
EOF
test_expect_success 'whitespace-only changes not reported' '
	git reset --hard &&
	echo >x "hello world" &&
	git add x &&
	git commit -m "hello 1" &&
	echo >x "hello  world" &&
	git diff -b >actual &&
	test_cmp expect actual
'

cat <<EOF >expect
diff --git a/x b/z
similarity index NUM%
rename from x
rename to z
index 380c32a..a97b785 100644
EOF
test_expect_success 'whitespace-only changes reported across renames' '
	git reset --hard &&
	for i in 1 2 3 4 5 6 7 8 9; do echo "$i$i$i$i$i$i"; done >x &&
	git add x &&
	git commit -m "base" &&
	sed -e "5s/^/ /" x >z &&
	git rm x &&
	git add z &&
	git diff -w -M --cached |
	sed -e "/^similarity index /s/[0-9][0-9]*/NUM/" >actual &&
	test_cmp expect actual
'

cat >expected <<\EOF
diff --git a/empty b/void
similarity index 100%
rename from empty
rename to void
EOF

test_expect_success 'rename empty' '
	git reset --hard &&
	>empty &&
	git add empty &&
	git commit -m empty &&
	git mv empty void &&
	git diff -w --cached -M >current &&
	test_cmp expected current
'

test_expect_success 'combined diff with autocrlf conversion' '

	git reset --hard &&
	echo >x hello &&
	git commit -m "one side" x &&
	git checkout HEAD^ &&
	echo >x goodbye &&
	git commit -m "the other side" x &&
	git config core.autocrlf true &&
	test_must_fail git merge master &&

	git diff | sed -e "1,/^@@@/d" >actual &&
	! grep "^-" actual

'

# Start testing the colored format for whitespace checks

test_expect_success 'setup diff colors' '
	git config color.diff always &&
	git config color.diff.plain normal &&
	git config color.diff.meta bold &&
	git config color.diff.frag cyan &&
	git config color.diff.func normal &&
	git config color.diff.old red &&
	git config color.diff.new green &&
	git config color.diff.commit yellow &&
	git config color.diff.whitespace "normal red" &&

	git config core.autocrlf false
'
cat >expected <<\EOF
<BOLD>diff --git a/x b/x<RESET>
<BOLD>index 9daeafb..2874b91 100644<RESET>
<BOLD>--- a/x<RESET>
<BOLD>+++ b/x<RESET>
<CYAN>@@ -1 +1,4 @@<RESET>
 test<RESET>
<GREEN>+<RESET><GREEN>{<RESET>
<GREEN>+<RESET><BRED>	<RESET>
<GREEN>+<RESET><GREEN>}<RESET>
EOF

test_expect_success 'diff that introduces a line with only tabs' '
	git config core.whitespace blank-at-eol &&
	git reset --hard &&
	echo "test" > x &&
	git commit -m "initial" x &&
	echo "{NTN}" | tr "NT" "\n\t" >> x &&
	git -c color.diff=always diff | test_decode_color >current &&
	test_cmp expected current
'

test_done