#!/bin/sh

global test_description := ''checkout $tree -- $paths''
source ./test-lib.sh

test_expect_success setup '
	mkdir dir &&
	>dir/master &&
	echo common >dir/common &&
	git add dir/master dir/common &&
	test_tick && git commit -m "master has dir/master" &&
	git checkout -b next &&
	git mv dir/master dir/next0 &&
	echo next >dir/next1 &&
	git add dir &&
	test_tick && git commit -m "next has dir/next but not dir/master"
'

test_expect_success 'checking out paths out of a tree does not clobber unrelated paths' '
	git checkout next &&
	git reset --hard &&
	rm dir/next0 &&
	cat dir/common >expect.common &&
	echo modified >expect.next1 &&
	cat expect.next1 >dir/next1 &&
	echo untracked >expect.next2 &&
	cat expect.next2 >dir/next2 &&

	git checkout master dir &&

	test_cmp expect.common dir/common &&
	test_path_is_file dir/master &&
	git diff --exit-code master dir/master &&

	test_path_is_missing dir/next0 &&
	test_cmp expect.next1 dir/next1 &&
	test_path_is_file dir/next2 &&
	test_must_fail git ls-files --error-unmatch dir/next2 &&
	test_cmp expect.next2 dir/next2
'

test_expect_success 'do not touch unmerged entries matching $path but not in $tree' '
	git checkout next &&
	git reset --hard &&

	cat dir/common >expect.common &&
	EMPTY_SHA1=$(git hash-object -w --stdin </dev/null) &&
	git rm dir/next0 &&
	cat >expect.next0 <<-EOF &&
	100644 $EMPTY_SHA1 1	dir/next0
	100644 $EMPTY_SHA1 2	dir/next0
	EOF
	git update-index --index-info <expect.next0 &&

	git checkout master dir &&

	test_cmp expect.common dir/common &&
	test_path_is_file dir/master &&
	git diff --exit-code master dir/master &&
	git ls-files -s dir/next0 >actual.next0 &&
	test_cmp expect.next0 actual.next0
'

test_expect_success 'do not touch files that are already up-to-date' '
	git reset --hard &&
	echo one >file1 &&
	echo two >file2 &&
	git add file1 file2 &&
	git commit -m base &&
	echo modified >file1 &&
	test-chmtime =1000000000 file2 &&
	git update-index -q --refresh &&
	git checkout HEAD -- file1 file2 &&
	echo one >expect &&
	test_cmp expect file1 &&
	echo "1000000000	file2" >expect &&
	test-chmtime -v +0 file2 >actual &&
	test_cmp expect actual
'

test_done
(CommandList
  children: [
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:test_description)
          op: Equal
          rhs: {(SQ <"checkout $tree -- $paths">)}
          spids: [4]
        )
      ]
      spids: [4]
    )
    (C {(.)} {(./test-lib.sh)})
    (C {(test_expect_success)} {(setup)} 
      {
        (SQ <"\n"> <"\tmkdir dir &&\n"> <"\t>dir/master &&\n"> <"\techo common >dir/common &&\n"> 
          <"\tgit add dir/master dir/common &&\n"> <"\ttest_tick && git commit -m \"master has dir/master\" &&\n"> <"\tgit checkout -b next &&\n"> 
          <"\tgit mv dir/master dir/next0 &&\n"> <"\techo next >dir/next1 &&\n"> <"\tgit add dir &&\n"> 
          <"\ttest_tick && git commit -m \"next has dir/next but not dir/master\"\n">
        )
      }
    )
    (C {(test_expect_success)} 
      {(SQ <"checking out paths out of a tree does not clobber unrelated paths">)} 
      {
        (SQ <"\n"> <"\tgit checkout next &&\n"> <"\tgit reset --hard &&\n"> <"\trm dir/next0 &&\n"> 
          <"\tcat dir/common >expect.common &&\n"> <"\techo modified >expect.next1 &&\n"> <"\tcat expect.next1 >dir/next1 &&\n"> 
          <"\techo untracked >expect.next2 &&\n"> <"\tcat expect.next2 >dir/next2 &&\n"> <"\n"> <"\tgit checkout master dir &&\n"> <"\n"> 
          <"\ttest_cmp expect.common dir/common &&\n"> <"\ttest_path_is_file dir/master &&\n"> <"\tgit diff --exit-code master dir/master &&\n"> <"\n"> 
          <"\ttest_path_is_missing dir/next0 &&\n"> <"\ttest_cmp expect.next1 dir/next1 &&\n"> <"\ttest_path_is_file dir/next2 &&\n"> 
          <"\ttest_must_fail git ls-files --error-unmatch dir/next2 &&\n"> <"\ttest_cmp expect.next2 dir/next2\n">
        )
      }
    )
    (C {(test_expect_success)} {(SQ <"do not touch unmerged entries matching $path but not in $tree">)} 
      {
        (SQ <"\n"> <"\tgit checkout next &&\n"> <"\tgit reset --hard &&\n"> <"\n"> 
          <"\tcat dir/common >expect.common &&\n"> <"\tEMPTY_SHA1=$(git hash-object -w --stdin </dev/null) &&\n"> <"\tgit rm dir/next0 &&\n"> 
          <"\tcat >expect.next0 <<-EOF &&\n"> <"\t100644 $EMPTY_SHA1 1\tdir/next0\n"> <"\t100644 $EMPTY_SHA1 2\tdir/next0\n"> <"\tEOF\n"> 
          <"\tgit update-index --index-info <expect.next0 &&\n"> <"\n"> <"\tgit checkout master dir &&\n"> <"\n"> <"\ttest_cmp expect.common dir/common &&\n"> 
          <"\ttest_path_is_file dir/master &&\n"> <"\tgit diff --exit-code master dir/master &&\n"> <"\tgit ls-files -s dir/next0 >actual.next0 &&\n"> 
          <"\ttest_cmp expect.next0 actual.next0\n">
        )
      }
    )
    (C {(test_expect_success)} {(SQ <"do not touch files that are already up-to-date">)} 
      {
        (SQ <"\n"> <"\tgit reset --hard &&\n"> <"\techo one >file1 &&\n"> <"\techo two >file2 &&\n"> 
          <"\tgit add file1 file2 &&\n"> <"\tgit commit -m base &&\n"> <"\techo modified >file1 &&\n"> <"\ttest-chmtime =1000000000 file2 &&\n"> 
          <"\tgit update-index -q --refresh &&\n"> <"\tgit checkout HEAD -- file1 file2 &&\n"> <"\techo one >expect &&\n"> 
          <"\ttest_cmp expect file1 &&\n"> <"\techo \"1000000000\tfile2\" >expect &&\n"> <"\ttest-chmtime -v +0 file2 >actual &&\n"> 
          <"\ttest_cmp expect actual\n">
        )
      }
    )
    (C {(test_done)})
  ]
)