#!/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"
}

test_expect_success 'basic usage requires no repo' '
        test_expect_code 129 git difftool -h >output &&
        grep ^usage: output &&
        # create a ceiling directory to prevent Git from finding a repo
        mkdir -p not/repo &&
        test_when_finished rm -r not &&
        test_expect_code 129 \
        env GIT_CEILING_DIRECTORIES="$(pwd)/not" \
        git -C not/repo difftool -h >output &&
        grep ^usage: output
'

# Create a file on master and change it on branch
test_expect_success '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 '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 '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 '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 '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 'difftool ignores exit code' '
        test_config difftool.error.cmd false &&
        git difftool -y -t error branch
'

test_expect_success '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 '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 '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 '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 '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 '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 'difftool honors exit status if command not found' '
        test_config difftool.nonexistent.cmd i-dont-exist &&
        test_config difftool.trustExitCode false &&
        test_must_fail git difftool -y -t nonexistent branch
'

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

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

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

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

test_expect_success 'setup change in subdirectory' '
        git checkout master &&
        mkdir sub &&
        echo master >sub/sub &&
        git add sub/sub &&
        git commit -m "added sub/sub" &&
        git tag v1 &&
        echo test >>file &&
        echo test >>sub/sub &&
        git add file sub/sub &&
        git commit -m "modified both"
'

run_dir_diff_test () {
        test_expect_success "$1 --no-symlinks" "
                symlinks=--no-symlinks &&
                $2
        "
        test_expect_success 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 branch from subdirectory' '
        (
                cd sub &&
                git difftool --dir-diff $symlinks --extcmd ls branch >output &&
                # "sub" must only exist in "right"
                # "file" and "file2" must be listed in both "left" and "right"
                test "1" = $(grep sub output | wc -l) &&
                test "2" = $(grep file"$" output | wc -l) &&
                test "2" = $(grep file2 output | wc -l)
        )
'

run_dir_diff_test 'difftool --dir-diff v1 from subdirectory' '
        (
                cd sub &&
                git difftool --dir-diff $symlinks --extcmd ls v1 >output &&
                # "sub" and "file" exist in both v1 and HEAD.
                # "file2" is unchanged.
                test "2" = $(grep sub output | wc -l) &&
                test "2" = $(grep file output | wc -l) &&
                test "0" = $(grep file2 output | wc -l)
        )
'

run_dir_diff_test 'difftool --dir-diff branch from subdirectory w/ pathspec' '
        (
                cd sub &&
                git difftool --dir-diff $symlinks --extcmd ls branch -- .>output &&
                # "sub" only exists in "right"
                # "file" and "file2" must not be listed
                test "1" = $(grep sub output | wc -l) &&
                test "0" = $(grep file output | wc -l)
        )
'

run_dir_diff_test 'difftool --dir-diff v1 from subdirectory w/ pathspec' '
        (
                cd sub &&
                git difftool --dir-diff $symlinks --extcmd ls v1 -- .>output &&
                # "sub" exists in v1 and HEAD
                # "file" is filtered out by the pathspec
                test "2" = $(grep sub output | wc -l) &&
                test "0" = $(grep file output | wc -l)
        )
'

run_dir_diff_test 'difftool --dir-diff from subdirectory with GIT_DIR set' '
        (
                GIT_DIR=$(pwd)/.git &&
                export GIT_DIR &&
                GIT_WORK_TREE=$(pwd) &&
                export GIT_WORK_TREE &&
                cd sub &&
                git difftool --dir-diff $symlinks --extcmd ls \
                        branch -- sub >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
'

run_dir_diff_test 'difftool --dir-diff with unmerged files' '
        test_when_finished git reset --hard &&
        test_config difftool.echo.cmd "echo ok" &&
        git checkout -B conflict-a &&
        git checkout -B conflict-b &&
        git checkout conflict-a &&
        echo a >>file &&
        git add file &&
        git commit -m conflict-a &&
        git checkout conflict-b &&
        echo b >>file &&
        git add file &&
        git commit -m conflict-b &&
        git checkout master &&
        git merge conflict-a &&
        test_must_fail git merge conflict-b &&
        cat >expect <<-EOF &&
                ok
        EOF
        git difftool --dir-diff $symlinks -t echo >actual &&
        test_cmp expect actual
'

write_script .git/CHECK_SYMLINKS <<\EOF
for f in file file2 sub/sub
do
        echo "$f"
        ls -ld "$2/$f" | sed -e 's/.* -> //'
done >actual
EOF

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

test_expect_success SYMLINKS 'difftool --dir-diff symlinked directories' '
        git init dirlinks &&
        (
                cd dirlinks &&
                git config diff.tool checktrees &&
                git config difftool.checktrees.cmd "echo good" &&
                mkdir foo &&
                : >foo/bar &&
                git add foo/bar &&
                test_commit symlink-one &&
                ln -s foo link &&
                git add link &&
                test_commit symlink-two &&
                echo good >expect &&
                git difftool --tool=checktrees --dir-diff HEAD~ >actual &&
                test_cmp expect actual
        )
'

test_done