#!/bin/sh

test_description='external diff interface test'

. ./test-lib.sh

test_expect_success setup '

	test_tick &&
	echo initial >file &&
	git add file &&
	git commit -m initial &&

	test_tick &&
	echo second >file &&
	before=$(git hash-object file) &&
	before=$(git rev-parse --short $before) &&
	git add file &&
	git commit -m second &&

	test_tick &&
	echo third >file
'

test_expect_success 'GIT_EXTERNAL_DIFF environment' '
	cat >expect <<-EOF &&
	file $(git rev-parse --verify HEAD:file) 100644 file $(test_oid zero) 100644
	EOF
	GIT_EXTERNAL_DIFF=echo git diff >out &&
	cut -d" " -f1,3- <out >actual &&
	test_cmp expect actual

'

test_expect_success 'GIT_EXTERNAL_DIFF environment should apply only to diff' '
	GIT_EXTERNAL_DIFF=echo git log -p -1 HEAD >out &&
	test_grep "^diff --git a/file b/file" out

'

test_expect_success 'GIT_EXTERNAL_DIFF environment and --no-ext-diff' '
	GIT_EXTERNAL_DIFF=echo git diff --no-ext-diff >out &&
	test_grep "^diff --git a/file b/file" out

'

test_expect_success 'GIT_EXTERNAL_DIFF and --output' '
	cat >expect <<-EOF &&
	file $(git rev-parse --verify HEAD:file) 100644 file $(test_oid zero) 100644
	EOF
	GIT_EXTERNAL_DIFF=echo git diff --output=out >stdout &&
	cut -d" " -f1,3- <out >actual &&
	test_must_be_empty stdout &&
	test_cmp expect actual
'

test_expect_success SYMLINKS 'typechange diff' '
	rm -f file &&
	ln -s elif file &&

	cat >expect <<-EOF &&
	file $(git rev-parse --verify HEAD:file) 100644 $(test_oid zero) 120000
	EOF
	GIT_EXTERNAL_DIFF=echo git diff >out &&
	cut -d" " -f1,3-4,6- <out >actual &&
	test_cmp expect actual &&

	GIT_EXTERNAL_DIFF=echo git diff --no-ext-diff >actual &&
	git diff >expect &&
	test_cmp expect actual
'

test_expect_success 'diff.external' '
	git reset --hard &&
	echo third >file &&
	test_config diff.external echo &&

	cat >expect <<-EOF &&
	file $(git rev-parse --verify HEAD:file) 100644 $(test_oid zero) 100644
	EOF
	git diff >out &&
	cut -d" " -f1,3-4,6- <out >actual &&
	test_cmp expect actual
'

test_expect_success 'diff.external should apply only to diff' '
	test_config diff.external echo &&
	git log -p -1 HEAD >out &&
	test_grep "^diff --git a/file b/file" out
'

test_expect_success 'diff.external and --no-ext-diff' '
	test_config diff.external echo &&
	git diff --no-ext-diff >out &&
	test_grep "^diff --git a/file b/file" out
'

test_expect_success 'diff attribute' '
	git reset --hard &&
	echo third >file &&

	git config diff.parrot.command echo &&

	echo >.gitattributes "file diff=parrot" &&

	cat >expect <<-EOF &&
	file $(git rev-parse --verify HEAD:file) 100644 $(test_oid zero) 100644
	EOF
	git diff >out &&
	cut -d" " -f1,3-4,6- <out >actual &&
	test_cmp expect actual
'

test_expect_success 'diff attribute should apply only to diff' '
	git log -p -1 HEAD >out &&
	test_grep "^diff --git a/file b/file" out

'

test_expect_success 'diff attribute and --no-ext-diff' '
	git diff --no-ext-diff >out &&
	test_grep "^diff --git a/file b/file" out

'

test_expect_success 'diff attribute' '

	git config --unset diff.parrot.command &&
	git config diff.color.command echo &&

	echo >.gitattributes "file diff=color" &&

	cat >expect <<-EOF &&
	file $(git rev-parse --verify HEAD:file) 100644 $(test_oid zero) 100644
	EOF
	git diff >out &&
	cut -d" " -f1,3-4,6- <out >actual &&
	test_cmp expect actual
'

test_expect_success 'diff attribute should apply only to diff' '
	git log -p -1 HEAD >out &&
	test_grep "^diff --git a/file b/file" out

'

test_expect_success 'diff attribute and --no-ext-diff' '
	git diff --no-ext-diff >out &&
	test_grep "^diff --git a/file b/file" out

'

test_expect_success 'GIT_EXTERNAL_DIFF trumps diff.external' '
	>.gitattributes &&
	test_config diff.external "echo ext-global" &&

	cat >expect <<-EOF &&
	ext-env file $(git rev-parse --verify HEAD:file) 100644 file $(test_oid zero) 100644
	EOF
	GIT_EXTERNAL_DIFF="echo ext-env" git diff >out &&
	cut -d" " -f1-2,4- <out >actual &&
	test_cmp expect actual
'

test_expect_success 'attributes trump GIT_EXTERNAL_DIFF and diff.external' '
	test_config diff.foo.command "echo ext-attribute" &&
	test_config diff.external "echo ext-global" &&
	echo "file diff=foo" >.gitattributes &&

	cat >expect <<-EOF &&
	ext-attribute file $(git rev-parse --verify HEAD:file) 100644 file $(test_oid zero) 100644
	EOF
	GIT_EXTERNAL_DIFF="echo ext-env" git diff >out &&
	cut -d" " -f1-2,4- <out >actual &&
	test_cmp expect actual
'

test_expect_success 'no diff with -diff' '
	echo >.gitattributes "file -diff" &&
	git diff >out &&
	test_grep Binary out
'

check_external_diff () {
	expect_code=$1
	expect_out=$2
	expect_err=$3
	command_code=$4
	trust_exit_code=$5
	shift 5
	options="$@"

	command="echo output; exit $command_code;"
	desc="external diff '$command' with trustExitCode=$trust_exit_code"
	with_options="${options:+ with }$options"

	test_expect_success "$desc via attribute$with_options" "
		test_config diff.foo.command \"$command\" &&
		test_config diff.foo.trustExitCode $trust_exit_code &&
		echo \"file diff=foo\" >.gitattributes &&
		test_expect_code $expect_code git diff $options >out 2>err &&
		test_cmp $expect_out out &&
		test_cmp $expect_err err
	"

	test_expect_success "$desc via diff.external$with_options" "
		test_config diff.external \"$command\" &&
		test_config diff.trustExitCode $trust_exit_code &&
		>.gitattributes &&
		test_expect_code $expect_code git diff $options >out 2>err &&
		test_cmp $expect_out out &&
		test_cmp $expect_err err
	"

	test_expect_success "$desc via GIT_EXTERNAL_DIFF$with_options" "
		>.gitattributes &&
		test_expect_code $expect_code env \
			GIT_EXTERNAL_DIFF=\"$command\" \
			GIT_EXTERNAL_DIFF_TRUST_EXIT_CODE=$trust_exit_code \
			git diff $options >out 2>err &&
		test_cmp $expect_out out &&
		test_cmp $expect_err err
	"
}

test_expect_success 'setup output files' '
	: >empty &&
	echo output >output &&
	echo "fatal: external diff died, stopping at file" >error
'

check_external_diff   0 output empty 0 off
check_external_diff 128 output error 1 off
check_external_diff   0 output empty 0 on
check_external_diff   0 output empty 1 on
check_external_diff 128 output error 2 on

check_external_diff   1 output empty 0 off --exit-code
check_external_diff 128 output error 1 off --exit-code
check_external_diff   0 output empty 0 on  --exit-code
check_external_diff   1 output empty 1 on  --exit-code
check_external_diff 128 output error 2 on  --exit-code

check_external_diff   1 empty  empty 0 off --quiet
check_external_diff   1 empty  empty 1 off --quiet # we don't even call the program
check_external_diff   0 empty  empty 0 on  --quiet
check_external_diff   1 empty  empty 1 on  --quiet
check_external_diff 128 empty  error 2 on  --quiet

echo NULZbetweenZwords | tr "Z" "\000" > file

test_expect_success 'force diff with "diff"' '
	after=$(git hash-object file) &&
	after=$(git rev-parse --short $after) &&
	echo >.gitattributes "file diff" &&
	git diff >actual &&
	sed -e "s/^index .*/index $before..$after 100644/" \
		"$TEST_DIRECTORY"/t4020/diff.NUL >expected-diff &&
	test_cmp expected-diff actual
'

test_expect_success 'GIT_EXTERNAL_DIFF with more than one changed files' '
	echo anotherfile > file2 &&
	git add file2 &&
	git commit -m "added 2nd file" &&
	echo modified >file2 &&
	GIT_EXTERNAL_DIFF=echo git diff
'

test_expect_success 'GIT_EXTERNAL_DIFF path counter/total' '
	write_script external-diff.sh <<-\EOF &&
	echo $GIT_DIFF_PATH_COUNTER of $GIT_DIFF_PATH_TOTAL >>counter.txt
	EOF
	>counter.txt &&
	cat >expect <<-\EOF &&
	1 of 2
	2 of 2
	EOF
	GIT_EXTERNAL_DIFF=./external-diff.sh git diff &&
	test_cmp expect counter.txt
'

test_expect_success 'GIT_EXTERNAL_DIFF generates pretty paths' '
	test_when_finished "git rm -f file.ext" &&
	touch file.ext &&
	git add file.ext &&
	echo with extension > file.ext &&

	cat >expect <<-EOF &&
	file.ext
	EOF
	GIT_EXTERNAL_DIFF=echo git diff file.ext >out &&
	basename $(cut -d" " -f2 <out) >actual &&
	test_cmp expect actual
'

echo "#!$SHELL_PATH" >fake-diff.sh
cat >> fake-diff.sh <<\EOF
cat $2 >> crlfed.txt
EOF
chmod a+x fake-diff.sh

keep_only_cr () {
	tr -dc '\015'
}

test_expect_success 'external diff with autocrlf = true' '
	test_config core.autocrlf true &&
	GIT_EXTERNAL_DIFF=./fake-diff.sh git diff &&
	test $(wc -l <crlfed.txt) = $(keep_only_cr <crlfed.txt | wc -c)
'

test_expect_success 'diff --cached' '
	test_config core.autocrlf true &&
	git add file &&
	git update-index --assume-unchanged file &&
	echo second >file &&
	git diff --cached >actual &&
	test_cmp expected-diff actual
'

test_expect_success 'clean up crlf leftovers' '
	git update-index --no-assume-unchanged file &&
	rm -f file* &&
	git reset --hard
'

test_expect_success 'submodule diff' '
	git init sub &&
	( cd sub && test_commit sub1 ) &&
	git add sub &&
	test_tick &&
	git commit -m "add submodule" &&
	( cd sub && test_commit sub2 ) &&
	write_script gather_pre_post.sh <<-\EOF &&
	echo "$1 $4" # path, mode
	cat "$2" # old file
	cat "$5" # new file
	EOF
	GIT_EXTERNAL_DIFF=./gather_pre_post.sh git diff >actual &&
	cat >expected <<-EOF &&
	sub 160000
	Subproject commit $(git rev-parse HEAD:sub)
	Subproject commit $(cd sub && git rev-parse HEAD)
	EOF
	test_cmp expected actual
'

test_done