t/t7800-difftool.sh - jrn/git - Git at Google

 #!/bin/sh
 #
 # Copyright (c) 2009, 2010, 2012, 2013 David Aguilar
 #

 test_description='git-difftool

 Testing basic diff tool invocation
 '

 . ./test-lib.sh

 difftool_test_setup ()
 {
 	test_config diff.tool test-tool &&
 	test_config difftool.test-tool.cmd 'cat "$LOCAL"' &&
 	test_config difftool.bogus-tool.cmd false
 }

 prompt_given ()
 {
 	prompt="$1"
 	test "$prompt" = "Launch 'test-tool' [Y/n]: branch"
 }

 # Create a file on master and change it on branch
 test_expect_success PERL 'setup' '
 	echo master >file &&
 	git add file &&
 	git commit -m "added file" &&

 	git checkout -b branch master &&
 	echo branch >file &&
 	git commit -a -m "branch changed file" &&
 	git checkout master
 '

 # Configure a custom difftool.<tool>.cmd and use it
 test_expect_success PERL 'custom commands' '
 	difftool_test_setup &&
 	test_config difftool.test-tool.cmd "cat \"\$REMOTE\"" &&
 	echo master >expect &&
 	git difftool --no-prompt branch >actual &&
 	test_cmp expect actual &&

 	test_config difftool.test-tool.cmd "cat \"\$LOCAL\"" &&
 	echo branch >expect &&
 	git difftool --no-prompt branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'custom tool commands override built-ins' '
 	test_config difftool.vimdiff.cmd "cat \"\$REMOTE\"" &&
 	echo master >expect &&
 	git difftool --tool vimdiff --no-prompt branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'difftool ignores bad --tool values' '
 	: >expect &&
 	test_must_fail \
 		git difftool --no-prompt --tool=bad-tool branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'difftool forwards arguments to diff' '
 	difftool_test_setup &&
 	>for-diff &&
 	git add for-diff &&
 	echo changes>for-diff &&
 	git add for-diff &&
 	: >expect &&
 	git difftool --cached --no-prompt -- for-diff >actual &&
 	test_cmp expect actual &&
 	git reset -- for-diff &&
 	rm for-diff
 '

 test_expect_success PERL 'difftool ignores exit code' '
 	test_config difftool.error.cmd false &&
 	git difftool -y -t error branch
 '

 test_expect_success PERL 'difftool forwards exit code with --trust-exit-code' '
 	test_config difftool.error.cmd false &&
 	test_must_fail git difftool -y --trust-exit-code -t error branch
 '

 test_expect_success PERL 'difftool forwards exit code with --trust-exit-code for built-ins' '
 	test_config difftool.vimdiff.path false &&
 	test_must_fail git difftool -y --trust-exit-code -t vimdiff branch
 '

 test_expect_success PERL 'difftool honors difftool.trustExitCode = true' '
 	test_config difftool.error.cmd false &&
 	test_config difftool.trustExitCode true &&
 	test_must_fail git difftool -y -t error branch
 '

 test_expect_success PERL 'difftool honors difftool.trustExitCode = false' '
 	test_config difftool.error.cmd false &&
 	test_config difftool.trustExitCode false &&
 	git difftool -y -t error branch
 '

 test_expect_success PERL 'difftool ignores exit code with --no-trust-exit-code' '
 	test_config difftool.error.cmd false &&
 	test_config difftool.trustExitCode true &&
 	git difftool -y --no-trust-exit-code -t error branch
 '

 test_expect_success PERL 'difftool stops on error with --trust-exit-code' '
 	test_when_finished "rm -f for-diff .git/fail-right-file" &&
 	test_when_finished "git reset -- for-diff" &&
 	write_script .git/fail-right-file <<-\EOF &&
 	echo "$2"
 	exit 1
 	EOF
 	>for-diff &&
 	git add for-diff &&
 	echo file >expect &&
 	test_must_fail git difftool -y --trust-exit-code \
 		--extcmd .git/fail-right-file branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'difftool honors --gui' '
 	difftool_test_setup &&
 	test_config merge.tool bogus-tool &&
 	test_config diff.tool bogus-tool &&
 	test_config diff.guitool test-tool &&

 	echo branch >expect &&
 	git difftool --no-prompt --gui branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'difftool --gui last setting wins' '
 	difftool_test_setup &&
 	: >expect &&
 	git difftool --no-prompt --gui --no-gui >actual &&
 	test_cmp expect actual &&

 	test_config merge.tool bogus-tool &&
 	test_config diff.tool bogus-tool &&
 	test_config diff.guitool test-tool &&
 	echo branch >expect &&
 	git difftool --no-prompt --no-gui --gui branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'difftool --gui works without configured diff.guitool' '
 	difftool_test_setup &&
 	echo branch >expect &&
 	git difftool --no-prompt --gui branch >actual &&
 	test_cmp expect actual
 '

 # Specify the diff tool using $GIT_DIFF_TOOL
 test_expect_success PERL 'GIT_DIFF_TOOL variable' '
 	difftool_test_setup &&
 	git config --unset diff.tool &&
 	echo branch >expect &&
 	GIT_DIFF_TOOL=test-tool git difftool --no-prompt branch >actual &&
 	test_cmp expect actual
 '

 # Test the $GIT_*_TOOL variables and ensure
 # that $GIT_DIFF_TOOL always wins unless --tool is specified
 test_expect_success PERL 'GIT_DIFF_TOOL overrides' '
 	difftool_test_setup &&
 	test_config diff.tool bogus-tool &&
 	test_config merge.tool bogus-tool &&

 	echo branch >expect &&
 	GIT_DIFF_TOOL=test-tool git difftool --no-prompt branch >actual &&
 	test_cmp expect actual &&

 	test_config diff.tool bogus-tool &&
 	test_config merge.tool bogus-tool &&
 	GIT_DIFF_TOOL=bogus-tool \
 		git difftool --no-prompt --tool=test-tool branch >actual &&
 	test_cmp expect actual
 '

 # Test that we don't have to pass --no-prompt to difftool
 # when $GIT_DIFFTOOL_NO_PROMPT is true
 test_expect_success PERL 'GIT_DIFFTOOL_NO_PROMPT variable' '
 	difftool_test_setup &&
 	echo branch >expect &&
 	GIT_DIFFTOOL_NO_PROMPT=true git difftool branch >actual &&
 	test_cmp expect actual
 '

 # git-difftool supports the difftool.prompt variable.
 # Test that GIT_DIFFTOOL_PROMPT can override difftool.prompt = false
 test_expect_success PERL 'GIT_DIFFTOOL_PROMPT variable' '
 	difftool_test_setup &&
 	test_config difftool.prompt false &&
 	echo >input &&
 	GIT_DIFFTOOL_PROMPT=true git difftool branch <input >output &&
 	prompt=$(tail -1 <output) &&
 	prompt_given "$prompt"
 '

 # Test that we don't have to pass --no-prompt when difftool.prompt is false
 test_expect_success PERL 'difftool.prompt config variable is false' '
 	difftool_test_setup &&
 	test_config difftool.prompt false &&
 	echo branch >expect &&
 	git difftool branch >actual &&
 	test_cmp expect actual
 '

 # Test that we don't have to pass --no-prompt when mergetool.prompt is false
 test_expect_success PERL 'difftool merge.prompt = false' '
 	difftool_test_setup &&
 	test_might_fail git config --unset difftool.prompt &&
 	test_config mergetool.prompt false &&
 	echo branch >expect &&
 	git difftool branch >actual &&
 	test_cmp expect actual
 '

 # Test that the -y flag can override difftool.prompt = true
 test_expect_success PERL 'difftool.prompt can overridden with -y' '
 	difftool_test_setup &&
 	test_config difftool.prompt true &&
 	echo branch >expect &&
 	git difftool -y branch >actual &&
 	test_cmp expect actual
 '

 # Test that the --prompt flag can override difftool.prompt = false
 test_expect_success PERL 'difftool.prompt can overridden with --prompt' '
 	difftool_test_setup &&
 	test_config difftool.prompt false &&
 	echo >input &&
 	git difftool --prompt branch <input >output &&
 	prompt=$(tail -1 <output) &&
 	prompt_given "$prompt"
 '

 # Test that the last flag passed on the command-line wins
 test_expect_success PERL 'difftool last flag wins' '
 	difftool_test_setup &&
 	echo branch >expect &&
 	git difftool --prompt --no-prompt branch >actual &&
 	test_cmp expect actual &&
 	echo >input &&
 	git difftool --no-prompt --prompt branch <input >output &&
 	prompt=$(tail -1 <output) &&
 	prompt_given "$prompt"
 '

 # git-difftool falls back to git-mergetool config variables
 # so test that behavior here
 test_expect_success PERL 'difftool + mergetool config variables' '
 	test_config merge.tool test-tool &&
 	test_config mergetool.test-tool.cmd "cat \$LOCAL" &&
 	echo branch >expect &&
 	git difftool --no-prompt branch >actual &&
 	test_cmp expect actual &&

 	# set merge.tool to something bogus, diff.tool to test-tool
 	test_config merge.tool bogus-tool &&
 	test_config diff.tool test-tool &&
 	git difftool --no-prompt branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'difftool.<tool>.path' '
 	test_config difftool.tkdiff.path echo &&
 	git difftool --tool=tkdiff --no-prompt branch >output &&
 	lines=$(grep file output | wc -l) &&
 	test "$lines" -eq 1
 '

 test_expect_success PERL 'difftool --extcmd=cat' '
 	echo branch >expect &&
 	echo master >>expect &&
 	git difftool --no-prompt --extcmd=cat branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'difftool --extcmd cat' '
 	echo branch >expect &&
 	echo master >>expect &&
 	git difftool --no-prompt --extcmd=cat branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'difftool -x cat' '
 	echo branch >expect &&
 	echo master >>expect &&
 	git difftool --no-prompt -x cat branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'difftool --extcmd echo arg1' '
 	echo file >expect &&
 	git difftool --no-prompt \
 		--extcmd sh\ -c\ \"echo\ \$1\" branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'difftool --extcmd cat arg1' '
 	echo master >expect &&
 	git difftool --no-prompt \
 		--extcmd sh\ -c\ \"cat\ \$1\" branch >actual &&
 	test_cmp expect actual
 '

 test_expect_success PERL 'difftool --extcmd cat arg2' '
 	echo branch >expect &&
 	git difftool --no-prompt \
 		--extcmd sh\ -c\ \"cat\ \$2\" branch >actual &&
 	test_cmp expect actual
 '

 # Create a second file on master and a different version on branch
 test_expect_success PERL 'setup with 2 files different' '
 	echo m2 >file2 &&
 	git add file2 &&
 	git commit -m "added file2" &&

 	git checkout branch &&
 	echo br2 >file2 &&
 	git add file2 &&
 	git commit -a -m "branch changed file2" &&
 	git checkout master
 '

 test_expect_success PERL 'say no to the first file' '
 	(echo n && echo) >input &&
 	git difftool -x cat branch <input >output &&
 	grep m2 output &&
 	grep br2 output &&
 	! grep master output &&
 	! grep branch output
 '

 test_expect_success PERL 'say no to the second file' '
 	(echo && echo n) >input &&
 	git difftool -x cat branch <input >output &&
 	grep master output &&
 	grep branch output &&
 	! grep m2 output &&
 	! grep br2 output
 '

 test_expect_success PERL 'ending prompt input with EOF' '
 	git difftool -x cat branch </dev/null >output &&
 	! grep master output &&
 	! grep branch output &&
 	! grep m2 output &&
 	! grep br2 output
 '

 test_expect_success PERL 'difftool --tool-help' '
 	git difftool --tool-help >output &&
 	grep tool output
 '

 test_expect_success PERL 'setup change in subdirectory' '
 	git checkout master &&
 	mkdir sub &&
 	echo master >sub/sub &&
 	git add sub/sub &&
 	git commit -m "added sub/sub" &&
 	echo test >>file &&
 	echo test >>sub/sub &&
 	git add file sub/sub &&
 	git commit -m "modified both"
 '

 run_dir_diff_test () {
 	test_expect_success PERL "$1 --no-symlinks" "
 		symlinks=--no-symlinks &&
 		$2
 	"
 	test_expect_success PERL,SYMLINKS "$1 --symlinks" "
 		symlinks=--symlinks &&
 		$2
 	"
 }

 run_dir_diff_test 'difftool -d' '
 	git difftool -d $symlinks --extcmd ls branch >output &&
 	grep sub output &&
 	grep file output
 '

 run_dir_diff_test 'difftool --dir-diff' '
 	git difftool --dir-diff $symlinks --extcmd ls branch >output &&
 	grep sub output &&
 	grep file output
 '

 run_dir_diff_test 'difftool --dir-diff ignores --prompt' '
 	git difftool --dir-diff $symlinks --prompt --extcmd ls branch >output &&
 	grep sub output &&
 	grep file output
 '

 run_dir_diff_test 'difftool --dir-diff from subdirectory' '
 	(
 		cd sub &&
 		git difftool --dir-diff $symlinks --extcmd ls branch >output &&
 		grep sub output &&
 		grep file output
 	)
 '

 run_dir_diff_test 'difftool --dir-diff when worktree file is missing' '
 	test_when_finished git reset --hard &&
 	rm file2 &&
 	git difftool --dir-diff $symlinks --extcmd ls branch master >output &&
 	grep file2 output
 '

 write_script .git/CHECK_SYMLINKS <<\EOF
 for f in file file2 sub/sub
 do
 	echo "$f"
 	readlink "$2/$f"
 done >actual
 EOF

 test_expect_success PERL,SYMLINKS 'difftool --dir-diff --symlink without unstaged changes' '
 	cat >expect <<-EOF &&
 	file
 	$(pwd)/file
 	file2
 	$(pwd)/file2
 	sub/sub
 	$(pwd)/sub/sub
 	EOF
 	git difftool --dir-diff --symlink \
 		--extcmd "./.git/CHECK_SYMLINKS" branch HEAD &&
 	test_cmp actual expect
 '

 write_script modify-right-file <<\EOF
 echo "new content" >"$2/file"
 EOF

 run_dir_diff_test 'difftool --dir-diff syncs worktree with unstaged change' '
 	test_when_finished git reset --hard &&
 	echo "orig content" >file &&
 	git difftool -d $symlinks --extcmd "$(pwd)/modify-right-file" branch &&
 	echo "new content" >expect &&
 	test_cmp expect file
 '

 run_dir_diff_test 'difftool --dir-diff syncs worktree without unstaged change' '
 	test_when_finished git reset --hard &&
 	git difftool -d $symlinks --extcmd "$(pwd)/modify-right-file" branch &&
 	echo "new content" >expect &&
 	test_cmp expect file
 '

 write_script modify-file <<\EOF
 echo "new content" >file
 EOF

 test_expect_success PERL 'difftool --no-symlinks does not overwrite working tree file ' '
 	echo "orig content" >file &&
 	git difftool --dir-diff --no-symlinks --extcmd "$(pwd)/modify-file" branch &&
 	echo "new content" >expect &&
 	test_cmp expect file
 '

 write_script modify-both-files <<\EOF
 echo "wt content" >file &&
 echo "tmp content" >"$2/file" &&
 echo "$2" >tmpdir
 EOF

 test_expect_success PERL 'difftool --no-symlinks detects conflict ' '
 	(
 		TMPDIR=$TRASH_DIRECTORY &&
 		export TMPDIR &&
 		echo "orig content" >file &&
 		test_must_fail git difftool --dir-diff --no-symlinks --extcmd "$(pwd)/modify-both-files" branch &&
 		echo "wt content" >expect &&
 		test_cmp expect file &&
 		echo "tmp content" >expect &&
 		test_cmp expect "$(cat tmpdir)/file"
 	)
 '

 test_expect_success PERL 'difftool properly honors gitlink and core.worktree' '
 	git submodule add ./. submod/ule &&
 	(
 		cd submod/ule &&
 		test_config diff.tool checktrees &&
 		test_config difftool.checktrees.cmd '\''
 			test -d "$LOCAL" && test -d "$REMOTE" && echo good
 		'\'' &&
 		echo good >expect &&
 		git difftool --tool=checktrees --dir-diff HEAD~ >actual &&
 		test_cmp expect actual
 	)
 '

 test_done
	#!/bin/sh
	#
	# Copyright (c) 2009, 2010, 2012, 2013 David Aguilar
	#

	test_description='git-difftool

	Testing basic diff tool invocation
	'

	. ./test-lib.sh

	difftool_test_setup ()
	{
	test_config diff.tool test-tool &&
	test_config difftool.test-tool.cmd 'cat "$LOCAL"' &&
	test_config difftool.bogus-tool.cmd false
	}

	prompt_given ()
	{
	prompt="$1"
	test "$prompt" = "Launch 'test-tool' [Y/n]: branch"
	}

	# Create a file on master and change it on branch
	test_expect_success PERL 'setup' '
	echo master >file &&
	git add file &&
	git commit -m "added file" &&

	git checkout -b branch master &&
	echo branch >file &&
	git commit -a -m "branch changed file" &&
	git checkout master
	'

	# Configure a custom difftool.<tool>.cmd and use it
	test_expect_success PERL 'custom commands' '
	difftool_test_setup &&
	test_config difftool.test-tool.cmd "cat \"\$REMOTE\"" &&
	echo master >expect &&
	git difftool --no-prompt branch >actual &&
	test_cmp expect actual &&

	test_config difftool.test-tool.cmd "cat \"\$LOCAL\"" &&
	echo branch >expect &&
	git difftool --no-prompt branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'custom tool commands override built-ins' '
	test_config difftool.vimdiff.cmd "cat \"\$REMOTE\"" &&
	echo master >expect &&
	git difftool --tool vimdiff --no-prompt branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'difftool ignores bad --tool values' '
	: >expect &&
	test_must_fail \
	git difftool --no-prompt --tool=bad-tool branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'difftool forwards arguments to diff' '
	difftool_test_setup &&
	>for-diff &&
	git add for-diff &&
	echo changes>for-diff &&
	git add for-diff &&
	: >expect &&
	git difftool --cached --no-prompt -- for-diff >actual &&
	test_cmp expect actual &&
	git reset -- for-diff &&
	rm for-diff
	'

	test_expect_success PERL 'difftool ignores exit code' '
	test_config difftool.error.cmd false &&
	git difftool -y -t error branch
	'

	test_expect_success PERL 'difftool forwards exit code with --trust-exit-code' '
	test_config difftool.error.cmd false &&
	test_must_fail git difftool -y --trust-exit-code -t error branch
	'

	test_expect_success PERL 'difftool forwards exit code with --trust-exit-code for built-ins' '
	test_config difftool.vimdiff.path false &&
	test_must_fail git difftool -y --trust-exit-code -t vimdiff branch
	'

	test_expect_success PERL 'difftool honors difftool.trustExitCode = true' '
	test_config difftool.error.cmd false &&
	test_config difftool.trustExitCode true &&
	test_must_fail git difftool -y -t error branch
	'

	test_expect_success PERL 'difftool honors difftool.trustExitCode = false' '
	test_config difftool.error.cmd false &&
	test_config difftool.trustExitCode false &&
	git difftool -y -t error branch
	'

	test_expect_success PERL 'difftool ignores exit code with --no-trust-exit-code' '
	test_config difftool.error.cmd false &&
	test_config difftool.trustExitCode true &&
	git difftool -y --no-trust-exit-code -t error branch
	'

	test_expect_success PERL 'difftool stops on error with --trust-exit-code' '
	test_when_finished "rm -f for-diff .git/fail-right-file" &&
	test_when_finished "git reset -- for-diff" &&
	write_script .git/fail-right-file <<-\EOF &&
	echo "$2"
	exit 1
	EOF
	>for-diff &&
	git add for-diff &&
	echo file >expect &&
	test_must_fail git difftool -y --trust-exit-code \
	--extcmd .git/fail-right-file branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'difftool honors --gui' '
	difftool_test_setup &&
	test_config merge.tool bogus-tool &&
	test_config diff.tool bogus-tool &&
	test_config diff.guitool test-tool &&

	echo branch >expect &&
	git difftool --no-prompt --gui branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'difftool --gui last setting wins' '
	difftool_test_setup &&
	: >expect &&
	git difftool --no-prompt --gui --no-gui >actual &&
	test_cmp expect actual &&

	test_config merge.tool bogus-tool &&
	test_config diff.tool bogus-tool &&
	test_config diff.guitool test-tool &&
	echo branch >expect &&
	git difftool --no-prompt --no-gui --gui branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'difftool --gui works without configured diff.guitool' '
	difftool_test_setup &&
	echo branch >expect &&
	git difftool --no-prompt --gui branch >actual &&
	test_cmp expect actual
	'

	# Specify the diff tool using $GIT_DIFF_TOOL
	test_expect_success PERL 'GIT_DIFF_TOOL variable' '
	difftool_test_setup &&
	git config --unset diff.tool &&
	echo branch >expect &&
	GIT_DIFF_TOOL=test-tool git difftool --no-prompt branch >actual &&
	test_cmp expect actual
	'

	# Test the $GIT_*_TOOL variables and ensure
	# that $GIT_DIFF_TOOL always wins unless --tool is specified
	test_expect_success PERL 'GIT_DIFF_TOOL overrides' '
	difftool_test_setup &&
	test_config diff.tool bogus-tool &&
	test_config merge.tool bogus-tool &&

	echo branch >expect &&
	GIT_DIFF_TOOL=test-tool git difftool --no-prompt branch >actual &&
	test_cmp expect actual &&

	test_config diff.tool bogus-tool &&
	test_config merge.tool bogus-tool &&
	GIT_DIFF_TOOL=bogus-tool \
	git difftool --no-prompt --tool=test-tool branch >actual &&
	test_cmp expect actual
	'

	# Test that we don't have to pass --no-prompt to difftool
	# when $GIT_DIFFTOOL_NO_PROMPT is true
	test_expect_success PERL 'GIT_DIFFTOOL_NO_PROMPT variable' '
	difftool_test_setup &&
	echo branch >expect &&
	GIT_DIFFTOOL_NO_PROMPT=true git difftool branch >actual &&
	test_cmp expect actual
	'

	# git-difftool supports the difftool.prompt variable.
	# Test that GIT_DIFFTOOL_PROMPT can override difftool.prompt = false
	test_expect_success PERL 'GIT_DIFFTOOL_PROMPT variable' '
	difftool_test_setup &&
	test_config difftool.prompt false &&
	echo >input &&
	GIT_DIFFTOOL_PROMPT=true git difftool branch <input >output &&
	prompt=$(tail -1 <output) &&
	prompt_given "$prompt"
	'

	# Test that we don't have to pass --no-prompt when difftool.prompt is false
	test_expect_success PERL 'difftool.prompt config variable is false' '
	difftool_test_setup &&
	test_config difftool.prompt false &&
	echo branch >expect &&
	git difftool branch >actual &&
	test_cmp expect actual
	'

	# Test that we don't have to pass --no-prompt when mergetool.prompt is false
	test_expect_success PERL 'difftool merge.prompt = false' '
	difftool_test_setup &&
	test_might_fail git config --unset difftool.prompt &&
	test_config mergetool.prompt false &&
	echo branch >expect &&
	git difftool branch >actual &&
	test_cmp expect actual
	'

	# Test that the -y flag can override difftool.prompt = true
	test_expect_success PERL 'difftool.prompt can overridden with -y' '
	difftool_test_setup &&
	test_config difftool.prompt true &&
	echo branch >expect &&
	git difftool -y branch >actual &&
	test_cmp expect actual
	'

	# Test that the --prompt flag can override difftool.prompt = false
	test_expect_success PERL 'difftool.prompt can overridden with --prompt' '
	difftool_test_setup &&
	test_config difftool.prompt false &&
	echo >input &&
	git difftool --prompt branch <input >output &&
	prompt=$(tail -1 <output) &&
	prompt_given "$prompt"
	'

	# Test that the last flag passed on the command-line wins
	test_expect_success PERL 'difftool last flag wins' '
	difftool_test_setup &&
	echo branch >expect &&
	git difftool --prompt --no-prompt branch >actual &&
	test_cmp expect actual &&
	echo >input &&
	git difftool --no-prompt --prompt branch <input >output &&
	prompt=$(tail -1 <output) &&
	prompt_given "$prompt"
	'

	# git-difftool falls back to git-mergetool config variables
	# so test that behavior here
	test_expect_success PERL 'difftool + mergetool config variables' '
	test_config merge.tool test-tool &&
	test_config mergetool.test-tool.cmd "cat \$LOCAL" &&
	echo branch >expect &&
	git difftool --no-prompt branch >actual &&
	test_cmp expect actual &&

	# set merge.tool to something bogus, diff.tool to test-tool
	test_config merge.tool bogus-tool &&
	test_config diff.tool test-tool &&
	git difftool --no-prompt branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'difftool.<tool>.path' '
	test_config difftool.tkdiff.path echo &&
	git difftool --tool=tkdiff --no-prompt branch >output &&
	lines=$(grep file output \| wc -l) &&
	test "$lines" -eq 1
	'

	test_expect_success PERL 'difftool --extcmd=cat' '
	echo branch >expect &&
	echo master >>expect &&
	git difftool --no-prompt --extcmd=cat branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'difftool --extcmd cat' '
	echo branch >expect &&
	echo master >>expect &&
	git difftool --no-prompt --extcmd=cat branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'difftool -x cat' '
	echo branch >expect &&
	echo master >>expect &&
	git difftool --no-prompt -x cat branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'difftool --extcmd echo arg1' '
	echo file >expect &&
	git difftool --no-prompt \
	--extcmd sh\ -c\ \"echo\ \$1\" branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'difftool --extcmd cat arg1' '
	echo master >expect &&
	git difftool --no-prompt \
	--extcmd sh\ -c\ \"cat\ \$1\" branch >actual &&
	test_cmp expect actual
	'

	test_expect_success PERL 'difftool --extcmd cat arg2' '
	echo branch >expect &&
	git difftool --no-prompt \
	--extcmd sh\ -c\ \"cat\ \$2\" branch >actual &&
	test_cmp expect actual
	'

	# Create a second file on master and a different version on branch
	test_expect_success PERL 'setup with 2 files different' '
	echo m2 >file2 &&
	git add file2 &&
	git commit -m "added file2" &&

	git checkout branch &&
	echo br2 >file2 &&
	git add file2 &&
	git commit -a -m "branch changed file2" &&
	git checkout master
	'

	test_expect_success PERL 'say no to the first file' '
	(echo n && echo) >input &&
	git difftool -x cat branch <input >output &&
	grep m2 output &&
	grep br2 output &&
	! grep master output &&
	! grep branch output
	'

	test_expect_success PERL 'say no to the second file' '
	(echo && echo n) >input &&
	git difftool -x cat branch <input >output &&
	grep master output &&
	grep branch output &&
	! grep m2 output &&
	! grep br2 output
	'

	test_expect_success PERL 'ending prompt input with EOF' '
	git difftool -x cat branch </dev/null >output &&
	! grep master output &&
	! grep branch output &&
	! grep m2 output &&
	! grep br2 output
	'

	test_expect_success PERL 'difftool --tool-help' '
	git difftool --tool-help >output &&
	grep tool output
	'

	test_expect_success PERL 'setup change in subdirectory' '
	git checkout master &&
	mkdir sub &&
	echo master >sub/sub &&
	git add sub/sub &&
	git commit -m "added sub/sub" &&
	echo test >>file &&
	echo test >>sub/sub &&
	git add file sub/sub &&
	git commit -m "modified both"
	'

	run_dir_diff_test () {
	test_expect_success PERL "$1 --no-symlinks" "
	symlinks=--no-symlinks &&
	$2
	"
	test_expect_success PERL,SYMLINKS "$1 --symlinks" "
	symlinks=--symlinks &&
	$2
	"
	}

	run_dir_diff_test 'difftool -d' '
	git difftool -d $symlinks --extcmd ls branch >output &&
	grep sub output &&
	grep file output
	'

	run_dir_diff_test 'difftool --dir-diff' '
	git difftool --dir-diff $symlinks --extcmd ls branch >output &&
	grep sub output &&
	grep file output
	'

	run_dir_diff_test 'difftool --dir-diff ignores --prompt' '
	git difftool --dir-diff $symlinks --prompt --extcmd ls branch >output &&
	grep sub output &&
	grep file output
	'

	run_dir_diff_test 'difftool --dir-diff from subdirectory' '
	(
	cd sub &&
	git difftool --dir-diff $symlinks --extcmd ls branch >output &&
	grep sub output &&
	grep file output
	)
	'

	run_dir_diff_test 'difftool --dir-diff when worktree file is missing' '
	test_when_finished git reset --hard &&
	rm file2 &&
	git difftool --dir-diff $symlinks --extcmd ls branch master >output &&
	grep file2 output
	'

	write_script .git/CHECK_SYMLINKS <<\EOF
	for f in file file2 sub/sub
	do
	echo "$f"
	readlink "$2/$f"
	done >actual
	EOF

	test_expect_success PERL,SYMLINKS 'difftool --dir-diff --symlink without unstaged changes' '
	cat >expect <<-EOF &&
	file
	$(pwd)/file
	file2
	$(pwd)/file2
	sub/sub
	$(pwd)/sub/sub
	EOF
	git difftool --dir-diff --symlink \
	--extcmd "./.git/CHECK_SYMLINKS" branch HEAD &&
	test_cmp actual expect
	'

	write_script modify-right-file <<\EOF
	echo "new content" >"$2/file"
	EOF

	run_dir_diff_test 'difftool --dir-diff syncs worktree with unstaged change' '
	test_when_finished git reset --hard &&
	echo "orig content" >file &&
	git difftool -d $symlinks --extcmd "$(pwd)/modify-right-file" branch &&
	echo "new content" >expect &&
	test_cmp expect file
	'

	run_dir_diff_test 'difftool --dir-diff syncs worktree without unstaged change' '
	test_when_finished git reset --hard &&
	git difftool -d $symlinks --extcmd "$(pwd)/modify-right-file" branch &&
	echo "new content" >expect &&
	test_cmp expect file
	'

	write_script modify-file <<\EOF
	echo "new content" >file
	EOF

	test_expect_success PERL 'difftool --no-symlinks does not overwrite working tree file ' '
	echo "orig content" >file &&
	git difftool --dir-diff --no-symlinks --extcmd "$(pwd)/modify-file" branch &&
	echo "new content" >expect &&
	test_cmp expect file
	'

	write_script modify-both-files <<\EOF
	echo "wt content" >file &&
	echo "tmp content" >"$2/file" &&
	echo "$2" >tmpdir
	EOF

	test_expect_success PERL 'difftool --no-symlinks detects conflict ' '
	(
	TMPDIR=$TRASH_DIRECTORY &&
	export TMPDIR &&
	echo "orig content" >file &&
	test_must_fail git difftool --dir-diff --no-symlinks --extcmd "$(pwd)/modify-both-files" branch &&
	echo "wt content" >expect &&
	test_cmp expect file &&
	echo "tmp content" >expect &&
	test_cmp expect "$(cat tmpdir)/file"
	)
	'

	test_expect_success PERL 'difftool properly honors gitlink and core.worktree' '
	git submodule add ./. submod/ule &&
	(
	cd submod/ule &&
	test_config diff.tool checktrees &&
	test_config difftool.checktrees.cmd '\''
	test -d "$LOCAL" && test -d "$REMOTE" && echo good
	'\'' &&
	echo good >expect &&
	git difftool --tool=checktrees --dir-diff HEAD~ >actual &&
	test_cmp expect actual
	)
	'

	test_done