t/t4034-diff-words.sh - jrn/git - Git at Google

 #!/bin/sh

 test_description='word diff colors'

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

 cat >pre.simple <<-\EOF
 	h(4)

 	a = b + c
 EOF
 cat >post.simple <<-\EOF
 	h(4),hh[44]

 	a = b + c

 	aa = a

 	aeff = aeff * ( aaa )
 EOF
 pre=$(git rev-parse --short $(git hash-object pre.simple))
 post=$(git rev-parse --short $(git hash-object post.simple))
 cat >expect.letter-runs-are-words <<-EOF
 	<BOLD>diff --git a/pre b/post<RESET>
 	<BOLD>index $pre..$post 100644<RESET>
 	<BOLD>--- a/pre<RESET>
 	<BOLD>+++ b/post<RESET>
 	<CYAN>@@ -1,3 +1,7 @@<RESET>
 	h(4),<GREEN>hh<RESET>[44]

 	a = b + c<RESET>

 	<GREEN>aa = a<RESET>

 	<GREEN>aeff = aeff * ( aaa<RESET> )
 EOF
 cat >expect.non-whitespace-is-word <<-EOF
 	<BOLD>diff --git a/pre b/post<RESET>
 	<BOLD>index $pre..$post 100644<RESET>
 	<BOLD>--- a/pre<RESET>
 	<BOLD>+++ b/post<RESET>
 	<CYAN>@@ -1,3 +1,7 @@<RESET>
 	h(4)<GREEN>,hh[44]<RESET>

 	a = b + c<RESET>

 	<GREEN>aa = a<RESET>

 	<GREEN>aeff = aeff * ( aaa )<RESET>
 EOF

 word_diff () {
 	pre=$(git rev-parse --short $(git hash-object pre)) &&
 	post=$(git rev-parse --short $(git hash-object post)) &&
 	test_must_fail git diff --no-index "$@" pre post >output &&
 	test_decode_color <output >output.decrypted &&
 	sed -e "2s/index [^ ]*/index $pre..$post/" expect >expected
 	test_cmp expected output.decrypted
 }

 test_language_driver () {
 	lang=$1
 	test_expect_success "diff driver '$lang'" '
 		cp "$TEST_DIRECTORY/t4034/'"$lang"'/pre" \
 			"$TEST_DIRECTORY/t4034/'"$lang"'/post" \
 			"$TEST_DIRECTORY/t4034/'"$lang"'/expect" . &&
 		echo "* diff='"$lang"'" >.gitattributes &&
 		word_diff --color-words
 	'
 }

 test_expect_success setup '
 	git config diff.color.old red &&
 	git config diff.color.new green &&
 	git config diff.color.func magenta
 '

 test_expect_success 'set up pre and post with runs of whitespace' '
 	cp pre.simple pre &&
 	cp post.simple post
 '

 test_expect_success 'word diff with runs of whitespace' '
 	cat >expect <<-EOF &&
 		<BOLD>diff --git a/pre b/post<RESET>
 		<BOLD>index $pre..$post 100644<RESET>
 		<BOLD>--- a/pre<RESET>
 		<BOLD>+++ b/post<RESET>
 		<CYAN>@@ -1,3 +1,7 @@<RESET>
 		<RED>h(4)<RESET><GREEN>h(4),hh[44]<RESET>

 		a = b + c<RESET>

 		<GREEN>aa = a<RESET>

 		<GREEN>aeff = aeff * ( aaa )<RESET>
 	EOF
 	word_diff --color-words &&
 	word_diff --word-diff=color &&
 	word_diff --color --word-diff=color
 '

 test_expect_success '--word-diff=porcelain' '
 	sed "s/#.*$//" >expect <<-EOF &&
 		diff --git a/pre b/post
 		index $pre..$post 100644
 		--- a/pre
 		+++ b/post
 		@@ -1,3 +1,7 @@
 		-h(4)
 		+h(4),hh[44]
 		~
 		 # significant space
 		~
 		 a = b + c
 		~
 		~
 		+aa = a
 		~
 		~
 		+aeff = aeff * ( aaa )
 		~
 	EOF
 	word_diff --word-diff=porcelain
 '

 test_expect_success '--word-diff=plain' '
 	cat >expect <<-EOF &&
 		diff --git a/pre b/post
 		index $pre..$post 100644
 		--- a/pre
 		+++ b/post
 		@@ -1,3 +1,7 @@
 		[-h(4)-]{+h(4),hh[44]+}

 		a = b + c

 		{+aa = a+}

 		{+aeff = aeff * ( aaa )+}
 	EOF
 	word_diff --word-diff=plain &&
 	word_diff --word-diff=plain --no-color
 '

 test_expect_success '--word-diff=plain --color' '
 	cat >expect <<-EOF &&
 		<BOLD>diff --git a/pre b/post<RESET>
 		<BOLD>index $pre..$post 100644<RESET>
 		<BOLD>--- a/pre<RESET>
 		<BOLD>+++ b/post<RESET>
 		<CYAN>@@ -1,3 +1,7 @@<RESET>
 		<RED>[-h(4)-]<RESET><GREEN>{+h(4),hh[44]+}<RESET>

 		a = b + c<RESET>

 		<GREEN>{+aa = a+}<RESET>

 		<GREEN>{+aeff = aeff * ( aaa )+}<RESET>
 	EOF
 	word_diff --word-diff=plain --color
 '

 test_expect_success 'word diff without context' '
 	cat >expect <<-EOF &&
 		<BOLD>diff --git a/pre b/post<RESET>
 		<BOLD>index $pre..$post 100644<RESET>
 		<BOLD>--- a/pre<RESET>
 		<BOLD>+++ b/post<RESET>
 		<CYAN>@@ -1 +1 @@<RESET>
 		<RED>h(4)<RESET><GREEN>h(4),hh[44]<RESET>
 		<CYAN>@@ -3,0 +4,4 @@<RESET> <RESET><MAGENTA>a = b + c<RESET>

 		<GREEN>aa = a<RESET>

 		<GREEN>aeff = aeff * ( aaa )<RESET>
 	EOF
 	word_diff --color-words --unified=0
 '

 test_expect_success 'word diff with a regular expression' '
 	cp expect.letter-runs-are-words expect &&
 	word_diff --color-words="[a-z]+"
 '

 test_expect_success 'word diff with zero length matches' '
 	cp expect.letter-runs-are-words expect &&
 	word_diff --color-words="[a-z${LF}]*"
 '

 test_expect_success 'set up a diff driver' '
 	git config diff.testdriver.wordRegex "[^[:space:]]" &&
 	cat <<-\EOF >.gitattributes
 		pre diff=testdriver
 		post diff=testdriver
 	EOF
 '

 test_expect_success 'option overrides .gitattributes' '
 	cp expect.letter-runs-are-words expect &&
 	word_diff --color-words="[a-z]+"
 '

 test_expect_success 'use regex supplied by driver' '
 	cp expect.non-whitespace-is-word expect &&
 	word_diff --color-words
 '

 test_expect_success 'set up diff.wordRegex option' '
 	git config diff.wordRegex "[[:alnum:]]+"
 '

 test_expect_success 'command-line overrides config' '
 	cp expect.letter-runs-are-words expect &&
 	word_diff --color-words="[a-z]+"
 '

 test_expect_success 'command-line overrides config: --word-diff-regex' '
 	cat >expect <<-EOF &&
 		<BOLD>diff --git a/pre b/post<RESET>
 		<BOLD>index $pre..$post 100644<RESET>
 		<BOLD>--- a/pre<RESET>
 		<BOLD>+++ b/post<RESET>
 		<CYAN>@@ -1,3 +1,7 @@<RESET>
 		h(4),<GREEN>{+hh+}<RESET>[44]

 		a = b + c<RESET>

 		<GREEN>{+aa = a+}<RESET>

 		<GREEN>{+aeff = aeff * ( aaa+}<RESET> )
 	EOF
 	word_diff --color --word-diff-regex="[a-z]+"
 '

 test_expect_success '.gitattributes override config' '
 	cp expect.non-whitespace-is-word expect &&
 	word_diff --color-words
 '

 test_expect_success 'setup: remove diff driver regex' '
 	test_unconfig diff.testdriver.wordRegex
 '

 test_expect_success 'use configured regex' '
 	cat >expect <<-EOF &&
 		<BOLD>diff --git a/pre b/post<RESET>
 		<BOLD>index $pre..$post 100644<RESET>
 		<BOLD>--- a/pre<RESET>
 		<BOLD>+++ b/post<RESET>
 		<CYAN>@@ -1,3 +1,7 @@<RESET>
 		h(4),<GREEN>hh[44<RESET>]

 		a = b + c<RESET>

 		<GREEN>aa = a<RESET>

 		<GREEN>aeff = aeff * ( aaa<RESET> )
 	EOF
 	word_diff --color-words
 '

 test_expect_success 'test parsing words for newline' '
 	echo "aaa (aaa)" >pre &&
 	echo "aaa (aaa) aaa" >post &&
 	pre=$(git rev-parse --short $(git hash-object pre)) &&
 	post=$(git rev-parse --short $(git hash-object post)) &&
 	cat >expect <<-EOF &&
 		<BOLD>diff --git a/pre b/post<RESET>
 		<BOLD>index $pre..$post 100644<RESET>
 		<BOLD>--- a/pre<RESET>
 		<BOLD>+++ b/post<RESET>
 		<CYAN>@@ -1 +1 @@<RESET>
 		aaa (aaa) <GREEN>aaa<RESET>
 	EOF
 	word_diff --color-words="a+"
 '

 test_expect_success 'test when words are only removed at the end' '
 	echo "(:" >pre &&
 	echo "(" >post &&
 	pre=$(git rev-parse --short $(git hash-object pre)) &&
 	post=$(git rev-parse --short $(git hash-object post)) &&
 	cat >expect <<-EOF &&
 		<BOLD>diff --git a/pre b/post<RESET>
 		<BOLD>index $pre..$post 100644<RESET>
 		<BOLD>--- a/pre<RESET>
 		<BOLD>+++ b/post<RESET>
 		<CYAN>@@ -1 +1 @@<RESET>
 		(<RED>:<RESET>
 	EOF
 	word_diff --color-words=.
 '

 test_expect_success '--word-diff=none' '
 	echo "(:" >pre &&
 	echo "(" >post &&
 	pre=$(git rev-parse --short $(git hash-object pre)) &&
 	post=$(git rev-parse --short $(git hash-object post)) &&
 	cat >expect <<-EOF &&
 		diff --git a/pre b/post
 		index $pre..$post 100644
 		--- a/pre
 		+++ b/post
 		@@ -1 +1 @@
 		-(:
 		+(
 	EOF
 	word_diff --word-diff=plain --word-diff=none
 '

 test_expect_success 'unset default driver' '
 	test_unconfig diff.wordregex
 '

 test_language_driver ada
 test_language_driver bibtex
 test_language_driver cpp
 test_language_driver csharp
 test_language_driver css
 test_language_driver dts
 test_language_driver fortran
 test_language_driver html
 test_language_driver java
 test_language_driver matlab
 test_language_driver objc
 test_language_driver pascal
 test_language_driver perl
 test_language_driver php
 test_language_driver python
 test_language_driver ruby
 test_language_driver scheme
 test_language_driver tex

 test_expect_success 'word-diff with diff.sbe' '
 	cat >pre <<-\EOF &&
 	a

 	b
 	EOF
 	cat >post <<-\EOF &&
 	a

 	c
 	EOF
 	pre=$(git rev-parse --short $(git hash-object pre)) &&
 	post=$(git rev-parse --short $(git hash-object post)) &&
 	cat >expect <<-EOF &&
 	diff --git a/pre b/post
 	index $pre..$post 100644
 	--- a/pre
 	+++ b/post
 	@@ -1,3 +1,3 @@
 	a

 	[-b-]{+c+}
 	EOF
 	test_config diff.suppress-blank-empty true &&
 	word_diff --word-diff=plain
 '

 test_expect_success 'word-diff with no newline at EOF' '
 	printf "%s" "a a a a a" >pre &&
 	printf "%s" "a a ab a a" >post &&
 	pre=$(git rev-parse --short $(git hash-object pre)) &&
 	post=$(git rev-parse --short $(git hash-object post)) &&
 	cat >expect <<-EOF &&
 	diff --git a/pre b/post
 	index $pre..$post 100644
 	--- a/pre
 	+++ b/post
 	@@ -1 +1 @@
 	a a [-a-]{+ab+} a a
 	EOF
 	word_diff --word-diff=plain
 '

 test_expect_success 'setup history with two files' '
 	echo "a b; c" >a.tex &&
 	echo "a b; c" >z.txt &&
 	git add a.tex z.txt &&
 	git commit -minitial &&

 	# modify both
 	echo "a bx; c" >a.tex &&
 	echo "a bx; c" >z.txt &&
 	git commit -mmodified -a
 '

 test_expect_success 'wordRegex for the first file does not apply to the second' '
 	echo "*.tex diff=tex" >.gitattributes &&
 	test_config diff.tex.wordRegex "[a-z]+|." &&
 	cat >expect <<-\EOF &&
 		diff --git a/a.tex b/a.tex
 		--- a/a.tex
 		+++ b/a.tex
 		@@ -1 +1 @@
 		a [-b-]{+bx+}; c
 		diff --git a/z.txt b/z.txt
 		--- a/z.txt
 		+++ b/z.txt
 		@@ -1 +1 @@
 		a [-b;-]{+bx;+} c
 	EOF
 	git diff --word-diff HEAD~ >actual &&
 	compare_diff_patch expect actual
 '

 test_done
	#!/bin/sh

	test_description='word diff colors'

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

	cat >pre.simple <<-\EOF
	h(4)

	a = b + c
	EOF
	cat >post.simple <<-\EOF
	h(4),hh[44]

	a = b + c

	aa = a

	aeff = aeff * ( aaa )
	EOF
	pre=$(git rev-parse --short $(git hash-object pre.simple))
	post=$(git rev-parse --short $(git hash-object post.simple))
	cat >expect.letter-runs-are-words <<-EOF
	<BOLD>diff --git a/pre b/post<RESET>
	<BOLD>index $pre..$post 100644<RESET>
	<BOLD>--- a/pre<RESET>
	<BOLD>+++ b/post<RESET>
	<CYAN>@@ -1,3 +1,7 @@<RESET>
	h(4),<GREEN>hh<RESET>[44]

	a = b + c<RESET>

	<GREEN>aa = a<RESET>

	<GREEN>aeff = aeff * ( aaa<RESET> )
	EOF
	cat >expect.non-whitespace-is-word <<-EOF
	<BOLD>diff --git a/pre b/post<RESET>
	<BOLD>index $pre..$post 100644<RESET>
	<BOLD>--- a/pre<RESET>
	<BOLD>+++ b/post<RESET>
	<CYAN>@@ -1,3 +1,7 @@<RESET>
	h(4)<GREEN>,hh[44]<RESET>

	a = b + c<RESET>

	<GREEN>aa = a<RESET>

	<GREEN>aeff = aeff * ( aaa )<RESET>
	EOF

	word_diff () {
	pre=$(git rev-parse --short $(git hash-object pre)) &&
	post=$(git rev-parse --short $(git hash-object post)) &&
	test_must_fail git diff --no-index "$@" pre post >output &&
	test_decode_color <output >output.decrypted &&
	sed -e "2s/index [^ ]*/index $pre..$post/" expect >expected
	test_cmp expected output.decrypted
	}

	test_language_driver () {
	lang=$1
	test_expect_success "diff driver '$lang'" '
	cp "$TEST_DIRECTORY/t4034/'"$lang"'/pre" \
	"$TEST_DIRECTORY/t4034/'"$lang"'/post" \
	"$TEST_DIRECTORY/t4034/'"$lang"'/expect" . &&
	echo "* diff='"$lang"'" >.gitattributes &&
	word_diff --color-words
	'
	}

	test_expect_success setup '
	git config diff.color.old red &&
	git config diff.color.new green &&
	git config diff.color.func magenta
	'

	test_expect_success 'set up pre and post with runs of whitespace' '
	cp pre.simple pre &&
	cp post.simple post
	'

	test_expect_success 'word diff with runs of whitespace' '
	cat >expect <<-EOF &&
	<BOLD>diff --git a/pre b/post<RESET>
	<BOLD>index $pre..$post 100644<RESET>
	<BOLD>--- a/pre<RESET>
	<BOLD>+++ b/post<RESET>
	<CYAN>@@ -1,3 +1,7 @@<RESET>
	<RED>h(4)<RESET><GREEN>h(4),hh[44]<RESET>

	a = b + c<RESET>

	<GREEN>aa = a<RESET>

	<GREEN>aeff = aeff * ( aaa )<RESET>
	EOF
	word_diff --color-words &&
	word_diff --word-diff=color &&
	word_diff --color --word-diff=color
	'

	test_expect_success '--word-diff=porcelain' '
	sed "s/#.*$//" >expect <<-EOF &&
	diff --git a/pre b/post
	index $pre..$post 100644
	--- a/pre
	+++ b/post
	@@ -1,3 +1,7 @@
	-h(4)
	+h(4),hh[44]
	~
	# significant space
	~
	a = b + c
	~
	~
	+aa = a
	~
	~
	+aeff = aeff * ( aaa )
	~
	EOF
	word_diff --word-diff=porcelain
	'

	test_expect_success '--word-diff=plain' '
	cat >expect <<-EOF &&
	diff --git a/pre b/post
	index $pre..$post 100644
	--- a/pre
	+++ b/post
	@@ -1,3 +1,7 @@
	[-h(4)-]{+h(4),hh[44]+}

	a = b + c

	{+aa = a+}

	{+aeff = aeff * ( aaa )+}
	EOF
	word_diff --word-diff=plain &&
	word_diff --word-diff=plain --no-color
	'

	test_expect_success '--word-diff=plain --color' '
	cat >expect <<-EOF &&
	<BOLD>diff --git a/pre b/post<RESET>
	<BOLD>index $pre..$post 100644<RESET>
	<BOLD>--- a/pre<RESET>
	<BOLD>+++ b/post<RESET>
	<CYAN>@@ -1,3 +1,7 @@<RESET>
	<RED>[-h(4)-]<RESET><GREEN>{+h(4),hh[44]+}<RESET>

	a = b + c<RESET>

	<GREEN>{+aa = a+}<RESET>

	<GREEN>{+aeff = aeff * ( aaa )+}<RESET>
	EOF
	word_diff --word-diff=plain --color
	'

	test_expect_success 'word diff without context' '
	cat >expect <<-EOF &&
	<BOLD>diff --git a/pre b/post<RESET>
	<BOLD>index $pre..$post 100644<RESET>
	<BOLD>--- a/pre<RESET>
	<BOLD>+++ b/post<RESET>
	<CYAN>@@ -1 +1 @@<RESET>
	<RED>h(4)<RESET><GREEN>h(4),hh[44]<RESET>
	<CYAN>@@ -3,0 +4,4 @@<RESET> <RESET><MAGENTA>a = b + c<RESET>

	<GREEN>aa = a<RESET>

	<GREEN>aeff = aeff * ( aaa )<RESET>
	EOF
	word_diff --color-words --unified=0
	'

	test_expect_success 'word diff with a regular expression' '
	cp expect.letter-runs-are-words expect &&
	word_diff --color-words="[a-z]+"
	'

	test_expect_success 'word diff with zero length matches' '
	cp expect.letter-runs-are-words expect &&
	word_diff --color-words="[a-z${LF}]*"
	'

	test_expect_success 'set up a diff driver' '
	git config diff.testdriver.wordRegex "[^[:space:]]" &&
	cat <<-\EOF >.gitattributes
	pre diff=testdriver
	post diff=testdriver
	EOF
	'

	test_expect_success 'option overrides .gitattributes' '
	cp expect.letter-runs-are-words expect &&
	word_diff --color-words="[a-z]+"
	'

	test_expect_success 'use regex supplied by driver' '
	cp expect.non-whitespace-is-word expect &&
	word_diff --color-words
	'

	test_expect_success 'set up diff.wordRegex option' '
	git config diff.wordRegex "[[:alnum:]]+"
	'

	test_expect_success 'command-line overrides config' '
	cp expect.letter-runs-are-words expect &&
	word_diff --color-words="[a-z]+"
	'

	test_expect_success 'command-line overrides config: --word-diff-regex' '
	cat >expect <<-EOF &&
	<BOLD>diff --git a/pre b/post<RESET>
	<BOLD>index $pre..$post 100644<RESET>
	<BOLD>--- a/pre<RESET>
	<BOLD>+++ b/post<RESET>
	<CYAN>@@ -1,3 +1,7 @@<RESET>
	h(4),<GREEN>{+hh+}<RESET>[44]

	a = b + c<RESET>

	<GREEN>{+aa = a+}<RESET>

	<GREEN>{+aeff = aeff * ( aaa+}<RESET> )
	EOF
	word_diff --color --word-diff-regex="[a-z]+"
	'

	test_expect_success '.gitattributes override config' '
	cp expect.non-whitespace-is-word expect &&
	word_diff --color-words
	'

	test_expect_success 'setup: remove diff driver regex' '
	test_unconfig diff.testdriver.wordRegex
	'

	test_expect_success 'use configured regex' '
	cat >expect <<-EOF &&
	<BOLD>diff --git a/pre b/post<RESET>
	<BOLD>index $pre..$post 100644<RESET>
	<BOLD>--- a/pre<RESET>
	<BOLD>+++ b/post<RESET>
	<CYAN>@@ -1,3 +1,7 @@<RESET>
	h(4),<GREEN>hh[44<RESET>]

	a = b + c<RESET>

	<GREEN>aa = a<RESET>

	<GREEN>aeff = aeff * ( aaa<RESET> )
	EOF
	word_diff --color-words
	'

	test_expect_success 'test parsing words for newline' '
	echo "aaa (aaa)" >pre &&
	echo "aaa (aaa) aaa" >post &&
	pre=$(git rev-parse --short $(git hash-object pre)) &&
	post=$(git rev-parse --short $(git hash-object post)) &&
	cat >expect <<-EOF &&
	<BOLD>diff --git a/pre b/post<RESET>
	<BOLD>index $pre..$post 100644<RESET>
	<BOLD>--- a/pre<RESET>
	<BOLD>+++ b/post<RESET>
	<CYAN>@@ -1 +1 @@<RESET>
	aaa (aaa) <GREEN>aaa<RESET>
	EOF
	word_diff --color-words="a+"
	'

	test_expect_success 'test when words are only removed at the end' '
	echo "(:" >pre &&
	echo "(" >post &&
	pre=$(git rev-parse --short $(git hash-object pre)) &&
	post=$(git rev-parse --short $(git hash-object post)) &&
	cat >expect <<-EOF &&
	<BOLD>diff --git a/pre b/post<RESET>
	<BOLD>index $pre..$post 100644<RESET>
	<BOLD>--- a/pre<RESET>
	<BOLD>+++ b/post<RESET>
	<CYAN>@@ -1 +1 @@<RESET>
	(<RED>:<RESET>
	EOF
	word_diff --color-words=.
	'

	test_expect_success '--word-diff=none' '
	echo "(:" >pre &&
	echo "(" >post &&
	pre=$(git rev-parse --short $(git hash-object pre)) &&
	post=$(git rev-parse --short $(git hash-object post)) &&
	cat >expect <<-EOF &&
	diff --git a/pre b/post
	index $pre..$post 100644
	--- a/pre
	+++ b/post
	@@ -1 +1 @@
	-(:
	+(
	EOF
	word_diff --word-diff=plain --word-diff=none
	'

	test_expect_success 'unset default driver' '
	test_unconfig diff.wordregex
	'

	test_language_driver ada
	test_language_driver bibtex
	test_language_driver cpp
	test_language_driver csharp
	test_language_driver css
	test_language_driver dts
	test_language_driver fortran
	test_language_driver html
	test_language_driver java
	test_language_driver matlab
	test_language_driver objc
	test_language_driver pascal
	test_language_driver perl
	test_language_driver php
	test_language_driver python
	test_language_driver ruby
	test_language_driver scheme
	test_language_driver tex

	test_expect_success 'word-diff with diff.sbe' '
	cat >pre <<-\EOF &&
	a

	b
	EOF
	cat >post <<-\EOF &&
	a

	c
	EOF
	pre=$(git rev-parse --short $(git hash-object pre)) &&
	post=$(git rev-parse --short $(git hash-object post)) &&
	cat >expect <<-EOF &&
	diff --git a/pre b/post
	index $pre..$post 100644
	--- a/pre
	+++ b/post
	@@ -1,3 +1,3 @@
	a

	[-b-]{+c+}
	EOF
	test_config diff.suppress-blank-empty true &&
	word_diff --word-diff=plain
	'

	test_expect_success 'word-diff with no newline at EOF' '
	printf "%s" "a a a a a" >pre &&
	printf "%s" "a a ab a a" >post &&
	pre=$(git rev-parse --short $(git hash-object pre)) &&
	post=$(git rev-parse --short $(git hash-object post)) &&
	cat >expect <<-EOF &&
	diff --git a/pre b/post
	index $pre..$post 100644
	--- a/pre
	+++ b/post
	@@ -1 +1 @@
	a a [-a-]{+ab+} a a
	EOF
	word_diff --word-diff=plain
	'

	test_expect_success 'setup history with two files' '
	echo "a b; c" >a.tex &&
	echo "a b; c" >z.txt &&
	git add a.tex z.txt &&
	git commit -minitial &&

	# modify both
	echo "a bx; c" >a.tex &&
	echo "a bx; c" >z.txt &&
	git commit -mmodified -a
	'

	test_expect_success 'wordRegex for the first file does not apply to the second' '
	echo "*.tex diff=tex" >.gitattributes &&
	test_config diff.tex.wordRegex "[a-z]+\|." &&
	cat >expect <<-\EOF &&
	diff --git a/a.tex b/a.tex
	--- a/a.tex
	+++ b/a.tex
	@@ -1 +1 @@
	a [-b-]{+bx+}; c
	diff --git a/z.txt b/z.txt
	--- a/z.txt
	+++ b/z.txt
	@@ -1 +1 @@
	a [-b;-]{+bx;+} c
	EOF
	git diff --word-diff HEAD~ >actual &&
	compare_diff_patch expect actual
	'

	test_done