#!/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"
}

stdin_contains ()
{
	grep >/dev/null "$1"
}

stdin_doesnot_contain ()
{
	! stdin_contains "$1"
}

# 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_expect_code 1 \
		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 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 &&
	stdin_contains m2 <output &&
	stdin_contains br2 <output &&
	stdin_doesnot_contain master <output &&
	stdin_doesnot_contain branch <output
'

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

test_expect_success PERL 'difftool --tool-help' '
	git difftool --tool-help >output &&
	stdin_contains 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 . &&
	git commit -m "modified both"
'

test_expect_success PERL 'difftool -d' '
	git difftool -d --extcmd ls branch >output &&
	stdin_contains sub <output &&
	stdin_contains file <output
'

test_expect_success PERL 'difftool --dir-diff' '
	git difftool --dir-diff --extcmd ls branch >output &&
	stdin_contains sub <output &&
	stdin_contains file <output
'

test_expect_success PERL 'difftool --dir-diff ignores --prompt' '
	git difftool --dir-diff --prompt --extcmd ls branch >output &&
	stdin_contains sub <output &&
	stdin_contains file <output
'

test_expect_success PERL 'difftool --dir-diff from subdirectory' '
	(
		cd sub &&
		git difftool --dir-diff --extcmd ls branch >output &&
		stdin_contains sub <output &&
		stdin_contains file <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
'

test_done