#!/bin/sh

test_description='working-tree-encoding conversion via gitattributes'

. ./test-lib.sh

test_expect_success 'setup test files' '
        git config core.eol lf &&

        text="hallo there!\ncan you read me?" &&
        echo "*.utf16 text working-tree-encoding=utf-16" >.gitattributes &&
        printf "$text" >test.utf8.raw &&
        printf "$text" | iconv -f UTF-8 -t UTF-16 >test.utf16.raw &&
        printf "$text" | iconv -f UTF-8 -t UTF-32 >test.utf32.raw &&

        # Line ending tests
        printf "one\ntwo\nthree\n" >lf.utf8.raw &&
        printf "one\r\ntwo\r\nthree\r\n" >crlf.utf8.raw &&

        # BOM tests
        printf "\0a\0b\0c"                         >nobom.utf16be.raw &&
        printf "a\0b\0c\0"                         >nobom.utf16le.raw &&
        printf "\376\777\0a\0b\0c"                 >bebom.utf16be.raw &&
        printf "\777\376a\0b\0c\0"                 >lebom.utf16le.raw &&
        printf "\0\0\0a\0\0\0b\0\0\0c"             >nobom.utf32be.raw &&
        printf "a\0\0\0b\0\0\0c\0\0\0"             >nobom.utf32le.raw &&
        printf "\0\0\376\777\0\0\0a\0\0\0b\0\0\0c" >bebom.utf32be.raw &&
        printf "\777\376\0\0a\0\0\0b\0\0\0c\0\0\0" >lebom.utf32le.raw &&

        # Add only UTF-16 file, we will add the UTF-32 file later
        cp test.utf16.raw test.utf16 &&
        cp test.utf32.raw test.utf32 &&
        git add .gitattributes test.utf16 &&
        git commit -m initial
'

test_expect_success 'ensure UTF-8 is stored in Git' '
        test_when_finished "rm -f test.utf16.git" &&

        git cat-file -p :test.utf16 >test.utf16.git &&
        test_cmp_bin test.utf8.raw test.utf16.git
'

test_expect_success 're-encode to UTF-16 on checkout' '
        test_when_finished "rm -f test.utf16.raw" &&

        rm test.utf16 &&
        git checkout test.utf16 &&
        test_cmp_bin test.utf16.raw test.utf16
'

test_expect_success 'check $GIT_DIR/info/attributes support' '
        test_when_finished "rm -f test.utf32.git" &&
        test_when_finished "git reset --hard HEAD" &&

        echo "*.utf32 text working-tree-encoding=utf-32" >.git/info/attributes &&
        git add test.utf32 &&

        git cat-file -p :test.utf32 >test.utf32.git &&
        test_cmp_bin test.utf8.raw test.utf32.git
'

for i in 16 32
do
        test_expect_success "check prohibited UTF-${i} BOM" '
                test_when_finished "git reset --hard HEAD" &&

                echo "*.utf${i}be text working-tree-encoding=utf-${i}be" >>.gitattributes &&
                echo "*.utf${i}le text working-tree-encoding=utf-${i}LE" >>.gitattributes &&

                # Here we add a UTF-16 (resp. UTF-32) files with BOM (big/little-endian)
                # but we tell Git to treat it as UTF-16BE/UTF-16LE (resp. UTF-32).
                # In these cases the BOM is prohibited.
                cp bebom.utf${i}be.raw bebom.utf${i}be &&
                test_must_fail git add bebom.utf${i}be 2>err.out &&
                test_i18ngrep "fatal: BOM is prohibited .* utf-${i}be" err.out &&
                test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out &&

                cp lebom.utf${i}le.raw lebom.utf${i}be &&
                test_must_fail git add lebom.utf${i}be 2>err.out &&
                test_i18ngrep "fatal: BOM is prohibited .* utf-${i}be" err.out &&
                test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out &&

                cp bebom.utf${i}be.raw bebom.utf${i}le &&
                test_must_fail git add bebom.utf${i}le 2>err.out &&
                test_i18ngrep "fatal: BOM is prohibited .* utf-${i}LE" err.out &&
                test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out &&

                cp lebom.utf${i}le.raw lebom.utf${i}le &&
                test_must_fail git add lebom.utf${i}le 2>err.out &&
                test_i18ngrep "fatal: BOM is prohibited .* utf-${i}LE" err.out &&
                test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out
        '

        test_expect_success "check required UTF-${i} BOM" '
                test_when_finished "git reset --hard HEAD" &&

                echo "*.utf${i} text working-tree-encoding=utf-${i}" >>.gitattributes &&

                cp nobom.utf${i}be.raw nobom.utf${i} &&
                test_must_fail git add nobom.utf${i} 2>err.out &&
                test_i18ngrep "fatal: BOM is required .* utf-${i}" err.out &&
                test_i18ngrep "use UTF-${i}BE or UTF-${i}LE" err.out &&

                cp nobom.utf${i}le.raw nobom.utf${i} &&
                test_must_fail git add nobom.utf${i} 2>err.out &&
                test_i18ngrep "fatal: BOM is required .* utf-${i}" err.out &&
                test_i18ngrep "use UTF-${i}BE or UTF-${i}LE" err.out
        '

        test_expect_success "eol conversion for UTF-${i} encoded files on checkout" '
                test_when_finished "rm -f crlf.utf${i}.raw lf.utf${i}.raw" &&
                test_when_finished "git reset --hard HEAD^" &&

                cat lf.utf8.raw | iconv -f UTF-8 -t UTF-${i} >lf.utf${i}.raw &&
                cat crlf.utf8.raw | iconv -f UTF-8 -t UTF-${i} >crlf.utf${i}.raw &&
                cp crlf.utf${i}.raw eol.utf${i} &&

                cat >expectIndexLF <<-EOF &&
                        i/lf    w/-text attr/text               eol.utf${i}
                EOF

                git add eol.utf${i} &&
                git commit -m eol &&

                # UTF-${i} with CRLF (Windows line endings)
                rm eol.utf${i} &&
                git -c core.eol=crlf checkout eol.utf${i} &&
                test_cmp_bin crlf.utf${i}.raw eol.utf${i} &&

                # Although the file has CRLF in the working tree,
                # ensure LF in the index
                git ls-files --eol eol.utf${i} >actual &&
                test_cmp expectIndexLF actual &&

                # UTF-${i} with LF (Unix line endings)
                rm eol.utf${i} &&
                git -c core.eol=lf checkout eol.utf${i} &&
                test_cmp_bin lf.utf${i}.raw eol.utf${i} &&

                # The file LF in the working tree, ensure LF in the index
                git ls-files --eol eol.utf${i} >actual &&
                test_cmp expectIndexLF actual
        '
done

test_expect_success 'check unsupported encodings' '
        test_when_finished "git reset --hard HEAD" &&

        echo "*.set text working-tree-encoding" >.gitattributes &&
        printf "set" >t.set &&
        test_must_fail git add t.set 2>err.out &&
        test_i18ngrep "true/false are no valid working-tree-encodings" err.out &&

        echo "*.unset text -working-tree-encoding" >.gitattributes &&
        printf "unset" >t.unset &&
        git add t.unset &&

        echo "*.empty text working-tree-encoding=" >.gitattributes &&
        printf "empty" >t.empty &&
        git add t.empty &&

        echo "*.garbage text working-tree-encoding=garbage" >.gitattributes &&
        printf "garbage" >t.garbage &&
        test_must_fail git add t.garbage 2>err.out &&
        test_i18ngrep "failed to encode" err.out
'

test_expect_success 'error if encoding round trip is not the same during refresh' '
        BEFORE_STATE=$(git rev-parse HEAD) &&
        test_when_finished "git reset --hard $BEFORE_STATE" &&

        # Add and commit a UTF-16 file but skip the "working-tree-encoding"
        # filter. Consequently, the in-repo representation is UTF-16 and not
        # UTF-8. This simulates a Git version that has no working tree encoding
        # support.
        echo "*.utf16le text working-tree-encoding=utf-16le" >.gitattributes &&
        echo "hallo" >nonsense.utf16le &&
        TEST_HASH=$(git hash-object --no-filters -w nonsense.utf16le) &&
        git update-index --add --cacheinfo 100644 $TEST_HASH nonsense.utf16le &&
        COMMIT=$(git commit-tree -p $(git rev-parse HEAD) -m "plain commit" $(git write-tree)) &&
        git update-ref refs/heads/master $COMMIT &&

        test_must_fail git checkout HEAD^ 2>err.out &&
        test_i18ngrep "error: .* overwritten by checkout:" err.out
'

test_expect_success 'error if encoding garbage is already in Git' '
        BEFORE_STATE=$(git rev-parse HEAD) &&
        test_when_finished "git reset --hard $BEFORE_STATE" &&

        # Skip the UTF-16 filter for the added file
        # This simulates a Git version that has no checkoutEncoding support
        cp nobom.utf16be.raw nonsense.utf16 &&
        TEST_HASH=$(git hash-object --no-filters -w nonsense.utf16) &&
        git update-index --add --cacheinfo 100644 $TEST_HASH nonsense.utf16 &&
        COMMIT=$(git commit-tree -p $(git rev-parse HEAD) -m "plain commit" $(git write-tree)) &&
        git update-ref refs/heads/master $COMMIT &&

        git diff 2>err.out &&
        test_i18ngrep "error: BOM is required" err.out
'

test_done