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2022-03-23Merge branch 'jd/userdiff-kotlin'Junio C Hamano1-0/+12
A new built-in userdiff driver for kotlin. * jd/userdiff-kotlin: userdiff: add builtin diff driver for kotlin language.
2022-03-12userdiff: add builtin diff driver for kotlin language.Jaydeep P Das1-0/+12
The xfuncname pattern finds func/class declarations in diffs to display as a hunk header. The word_regex pattern finds individual tokens in Kotlin code to generate appropriate diffs. This patch adds xfuncname regex and word_regex for Kotlin language. Signed-off-by: Jaydeep P Das <jaydeepjd.8914@gmail.com> Acked-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-02-24userdiff.c: use designated initializers for "struct userdiff_driver"Ævar Arnfjörð Bjarmason1-14/+22
Change the "struct userdiff_driver" assignmentns to use designated initializers, but let's keep the PATTERNS() and IPATTERN() convenience macros to avoid churn, but have them defined in terms of designated initializers. For the "driver_true" and "driver_false" let's have the compiler implicitly initialize most of the fields, but let's leave a redundant ".binary = 0" for "driver_true" to make it obvious that it's the opposite of the the ".binary = 1" for "driver_false". Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-10-25userdiff-cpp: back out the digit-separators in numbersJohannes Sixt1-3/+3
The implementation of digit-separating single-quotes introduced a note-worthy regression: the change of a character literal with a digit would splice the digit and the closing single-quote. For example, the change from 'a' to '2' is now tokenized as '[-a'-]{+2'+} instead of '[-a-]{+2+}'. The options to fix the regression are: - Tighten the regular expression such that the single-quote can only occur between digits (that would match the official syntax). - Remove support for digit separators. I chose to remove support, because - I have not seen a lot of code make use of digit separators. - If code does use digit separators, then the numbers are typically long. If a change in one of the segments occurs, it is actually better visible if only that segment is highlighted as the word that changed instead of the whole long number. This choice does introduce another minor regression, though, which is highlighted in the test case: when a change occurs in the second or later segment of a hexadecimal number where the segment begins with a digit, but also has letters, the segment is mistaken as consisting of a number and an identifier. I can live with that. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-10-10userdiff-cpp: learn the C++ spaceship operatorJohannes Sixt1-1/+1
Since C++20, the language has a generalized comparison operator <=>. Teach the cpp driver not to separate it into <= and > tokens. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-10-10userdiff-cpp: permit the digit-separating single-quote in numbersJohannes Sixt1-3/+3
Since C++17, the single-quote can be used as digit separator: 3.141'592'654 1'000'000 0xdead'beaf Make it known to the word regex of the cpp driver, so that numbers are not split into separate tokens at the single-quotes. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-10-08userdiff-cpp: tighten word regexJohannes Sixt1-1/+7
Generally, word regex can be written such that they match tokens liberally and need not model the actual syntax because it can be assumed that the regex will only be applied to syntactically correct text. The regex for cpp (C/C++) is too liberal, though. It regards these sequences as single tokens: 1+2 1.5-e+2+f and the following amalgams as one token: .l as in str.length .f as in str.find .e as in str.erase Tighten the regex in the following way: - Accept + and - only in one position in the exponent. + and - are no longer regarded as the sign of a number and are treated by the catcher-all that is not visible in the driver's regex. - Accept a leading decimal point only when it is followed by a digit. For readability, factor hex- and binary numbers into an own term. As a drive-by, this fixes that floating point numbers such as 12E5 (with upper-case E) were split into two tokens. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-09-10Merge branch 'uk/userdiff-php-enum'Junio C Hamano1-1/+1
Update the userdiff pattern for PHP. * uk/userdiff-php-enum: userdiff: support enum keyword in PHP hunk header
2021-08-31userdiff: support enum keyword in PHP hunk headerUSAMI Kenta1-1/+1
"enum" keyword will be introduced in PHP 8.1. https://wiki.php.net/rfc/enumerations Signed-off-by: USAMI Kenta <tadsan@zonu.me> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-08-30Merge branch 'th/userdiff-more-java'Junio C Hamano1-1/+5
The userdiff pattern for "java" language has been updated. * th/userdiff-more-java: userdiff: improve java hunk header regex
2021-08-30Merge branch 'jc/userdiff-pattern-hint'Junio C Hamano1-0/+10
Remind developers that the userdiff patterns should be kept simple and permissive, assuming that the contents they apply are always syntactically correct. * jc/userdiff-pattern-hint: userdiff: comment on the builtin patterns
2021-08-11userdiff: improve java hunk header regexTassilo Horn1-1/+5
Currently, the git diff hunk headers show the wrong method signature if the method has a qualified return type, an array return type, or a generic return type because the regex doesn't allow dots (.), [], or < and > in the return type. Also, type parameter declarations couldn't be matched. Add several t4018 tests asserting the right hunk headers for different cases: - enum constant change - change in generic method with bounded type parameters - change in generic method with wildcard - field change in a nested class Signed-off-by: Tassilo Horn <tsdh@gnu.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-08-11userdiff: comment on the builtin patternsJunio C Hamano1-0/+10
Remind developers that they do not need to go overboard to implement patterns to prepare for invalid constructs. They only have to be sufficiently permissive, assuming that the payload is syntactically correct, and that may allow them to be simpler. Text stolen mostly from, and further improved by, Johannes Sixt. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-16userdiff: add support for C# record typesJulian Verdurmen1-1/+1
Records are added in C# 9 Code example : public record Person(string FirstName, string LastName); For more information, see: * https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9 Signed-off-by: Julian Verdurmen <julian.verdurmen@outlook.com> Reviewed-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-04-20Merge branch 'ab/userdiff-tests'Junio C Hamano1-57/+112
A bit of code clean-up and a lot of test clean-up around userdiff area. * ab/userdiff-tests: blame tests: simplify userdiff driver test blame tests: don't rely on t/t4018/ directory userdiff: remove support for "broken" tests userdiff tests: list builtin drivers via test-tool userdiff tests: explicitly test "default" pattern userdiff: add and use for_each_userdiff_driver() userdiff style: normalize pascal regex declaration userdiff style: declare patterns with consistent style userdiff style: re-order drivers in alphabetical order
2021-04-08userdiff: add support for SchemeAtharva Raykar1-0/+9
Add a diff driver for Scheme-like languages which recognizes top level and local `define` forms, whether it is a function definition, binding, syntax definition or a user-defined `define-xyzzy` form. Also supports R6RS `library` forms, `module` forms along with class and struct declarations used in Racket (PLT Scheme). Alternate "def" syntax such as those in Gerbil Scheme are also supported, like defstruct, defsyntax and so on. The rationale for picking `define` forms for the hunk headers is because it is usually the only significant form for defining the structure of the program, and it is a common pattern for schemers to have local function definitions to hide their visibility, so it is not only the top level `define`'s that are of interest. Schemers also extend the language with macros to provide their own define forms (for example, something like a `define-test-suite`) which is also captured in the hunk header. Since it is common practice to extend syntax with variants of a form like `module+`, `class*` etc, those have been supported as well. The word regex is a best-effort attempt to conform to R7RS[1] valid identifiers, symbols and numbers. [1] https://small.r7rs.org/attachment/r7rs.pdf (section 2.1) Signed-off-by: Atharva Raykar <raykar.ath@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-04-08userdiff: add and use for_each_userdiff_driver()Ævar Arnfjörð Bjarmason1-12/+58
Refactor the userdiff_find_by_namelen() function so that a new for_each_userdiff_driver() API function does most of the work. This will be useful for the same reason we've got other for_each_*() API functions as part of various APIs, and will be used in a follow-up commit. Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-04-08userdiff style: normalize pascal regex declarationÆvar Arnfjörð Bjarmason1-3/+2
Declare the pascal pattern consistently with how we declare the others, not having "\n" on one line by itself, but as part of the pattern, and when there are alterations have the "|" at the start, not end of the line. Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-04-08userdiff style: declare patterns with consistent styleÆvar Arnfjörð Bjarmason1-5/+15
Change those patterns which were declared with a regex on the same line as the "PATTERNS()" line to put that regex on the next line, and add missing "/* -- */" separator comments between the pattern and word_regex. Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-04-08userdiff style: re-order drivers in alphabetical orderÆvar Arnfjörð Bjarmason1-38/+38
Address some old code smell and move around the built-in userdiff drivers so they're both in alphabetical order, and now in the same order they appear in the gitattributes(5) documentation. The two started drifting in be58e70dba (diff: unify external diff and funcname parsing code, 2008-10-05), and then even further in 80c49c3de2 (color-words: make regex configurable via attributes, 2009-01-17) when the "cpp" pattern was added. There are no functional changes here, and as --color-moved will show only moved existing lines. Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-11-02Merge branch 've/userdiff-bash'Junio C Hamano1-0/+21
The userdiff pattern learned to identify the function definition in POSIX shells and bash. * ve/userdiff-bash: userdiff: support Bash
2020-10-27Merge branch 'sd/userdiff-css-update'Junio C Hamano1-1/+1
Userdiff for CSS update. * sd/userdiff-css-update: userdiff: expand detected chunk headers for css
2020-10-27Merge branch 'kb/userdiff-rust-macro-rules'Junio C Hamano1-1/+1
Userdiff for Rust update. * kb/userdiff-rust-macro-rules: userdiff: recognize 'macro_rules!' as starting a Rust function block
2020-10-22userdiff: support BashVictor Engmark1-0/+21
Support POSIX, bashism and mixed function declarations, all four compound command types, trailing comments and mixed whitespace. Even though Bash allows locale-dependent characters in function names <https://unix.stackexchange.com/a/245336/3645>, only detect function names with characters allowed by POSIX.1-2017 <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_235> for simplicity. This should cover the vast majority of use cases, and produces system-agnostic results. Since a word pattern has to be specified, but there is no easy way to know the default word pattern, use the default `IFS` characters for a starter. A later patch can improve this. Signed-off-by: Victor Engmark <victor@engmark.name> Acked-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-10-08userdiff: expand detected chunk headers for cssSohom Datta1-1/+1
The regex used for the CSS builtin diff driver in git is only able to show chunk headers for lines that start with a number, a letter or an underscore. However, the regex fails to detect classes (starts with a .), ids (starts with a #), :root and attribute-value based selectors (for example [class*="col-"]), as well as @based block-level statements like @page,@keyframes and @media since all of them, start with a special character. Allow the selectors and block level statements to begin with these special characters. Signed-off-by: Sohom Datta <sohom.datta@learner.manipal.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-10-07userdiff: recognize 'macro_rules!' as starting a Rust function blockKonrad Borowski1-1/+1
Signed-off-by: Konrad Borowski <konrad@borowski.pw> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-10-07userdiff: PHP: catch "abstract" and "final" functionsJavier Spagnoletti1-1/+1
PHP permits functions to be defined like final public function foo() { } abstract protected function bar() { } but our hunk header pattern does not recognize these decorations. Add "final" and "abstract" to the list of function modifiers. Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Javier Spagnoletti <phansys@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-08-13userdiff: improve Fortran xfuncname regexPhilippe Blain1-1/+1
The third part of the Fortran xfuncname regex wants to match the beginning of a subroutine or function, so it allows for all characters except `'`, `"` or whitespace before the keyword 'function' or 'subroutine'. This is meant to match the 'recursive', 'elemental' or 'pure' keywords, as well as function return types, and to prevent matches inside strings. However, the negated set does not contain the `!` comment character, so a line with an end-of-line comment containing the keyword 'function' or 'subroutine' followed by another word is mistakenly chosen as a hunk header. Improve the regex by adding `!` to the negated set. Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-08-13userdiff: add tests for Fortran xfuncname regexPhilippe Blain1-0/+4
The Fortran userdiff patterns, introduced in 909a5494f8 (userdiff.c: add builtin fortran regex patterns, 2010-09-10), predate the test infrastructure for xfuncname patterns, introduced in bfa7d01413 (t4018: an infrastructure to test hunk headers, 2014-03-21). Add tests for the Fortran xfuncname patterns. The test 't/t4018/fortran-comment-keyword' documents a shortcoming of the regex that is fixed in a subsequent commit. While at it, add descriptive comments for the different parts of the regex. Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-05-08Merge branch 'ah/userdiff-markdown'Junio C Hamano1-0/+3
The userdiff patterns for Markdown documents have been added. * ah/userdiff-markdown: userdiff: support Markdown
2020-05-02userdiff: support MarkdownAsh Holland1-0/+3
It's typical to find Markdown documentation alongside source code, and having better context for documentation changes is useful; see also commit 69f9c87d4 (userdiff: add support for Fountain documents, 2015-07-21). The pattern is based on the CommonMark specification 0.29, section 4.2 <https://spec.commonmark.org/> but doesn't match empty headings, as seeing them in a hunk header is unlikely to be useful. Only ATX headings are supported, as detecting setext headings would require printing the line before a pattern matches, or matching a multiline pattern. The word-diff pattern is the same as the pattern for HTML, because many Markdown parsers accept inline HTML. Signed-off-by: Ash Holland <ash@sorrel.sh> Acked-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-10parse_config_key(): return subsection len as size_tJeff King1-2/+2
We return the length to a subset of a string using an "int *" out-parameter. This is fine most of the time, as we'd expect config keys to be relatively short, but it could behave oddly if we had a gigantic config key. A more appropriate type is size_t. Let's switch over, which lets our callers use size_t as appropriate (they are bound by our type because they must pass the out-parameter as a pointer). This is mostly just a cleanup to make it clear this code handles long strings correctly. In practice, our config parser already chokes on long key names (because of a similar int/size_t mixup!). When doing an int/size_t conversion, we have to be careful that nobody was trying to assign a negative value to the variable. I manually confirmed that for each case here. They tend to just feed the result to xmemdupz() or similar; in a few cases I adjusted the parameter types for helper functions to make sure the size_t is preserved. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-12-25Merge branch 'ln/userdiff-elixir'Junio C Hamano1-1/+2
Hotfix. * ln/userdiff-elixir: userdiff: remove empty subexpression from elixir regex
2019-12-13userdiff: remove empty subexpression from elixir regexEd Maste1-1/+2
The regex failed to compile on FreeBSD. Also add /* -- */ mark to separate the two regex entries given to the PATTERNS() macro, to make it consistent with patterns for other content types. Signed-off-by: Ed Maste <emaste@FreeBSD.org> Reviewed-by: Jeff King <peff@peff.net> Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-12-05Merge branch 'jh/userdiff-python-async'Junio C Hamano1-1/+1
The userdiff machinery has been taught that "async def" is another way to begin a "function" in Python. * jh/userdiff-python-async: userdiff: support Python async functions
2019-11-20userdiff: support Python async functionsJosh Holland1-1/+1
Python's async functions (declared with "async def" rather than "def") were not being displayed in hunk headers. This commit teaches git about the async function syntax, and adds tests for the Python userdiff regex. Signed-off-by: Josh Holland <anowlcalledjosh@gmail.com> Acked-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-11-10userdiff: add Elixir to supported userdiff languagesŁukasz Niemier1-0/+12
Adds support for xfuncref in Elixir[1] language which is Ruby-like language that runs on Erlang[3] Virtual Machine (BEAM). [1]: https://elixir-lang.org [2]: https://www.erlang.org Signed-off-by: Łukasz Niemier <lukasz@niemier.pl> Acked-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-21userdiff: fix some corner cases in dts regexStephen Boyd1-1/+2
While reviewing some dts diffs recently I noticed that the hunk header logic was failing to find the containing node. This is because the regex doesn't consider properties that may span multiple lines, i.e. property = <something>, <something_else>; and it got hung up on comments inside nodes that look like the root node because they start with '/*'. Add tests for these cases and update the regex to find them. Maybe detecting the root node is too complicated but forcing it to be a backslash with any amount of whitespace up to an open bracket seemed OK. I tried to detect that a comment is in-between the two parts but I wasn't happy so I just dropped it. Cc: Rob Herring <robh+dt@kernel.org> Cc: Frank Rowand <frowand.list@gmail.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org> Reviewed-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-08-21userdiff: add a builtin pattern for dts filesStephen Boyd1-0/+8
The Linux kernel receives many patches to the devicetree files each release. The hunk header for those patches typically show nothing, making it difficult to figure out what node is being modified without applying the patch or opening the file and seeking to the context. Let's add a builtin 'dts' pattern to git so that users can get better diff output on dts files when they use the diff=dts driver. The regex has been constructed based on the spec at devicetree.org[1] and with some help from Johannes Sixt. [1] https://github.com/devicetree-org/devicetree-specification/releases/latest Cc: Rob Herring <robh+dt@kernel.org> Cc: Frank Rowand <frowand.list@gmail.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-06-21Merge branch 'ml/userdiff-rust'Junio C Hamano1-0/+6
The pattern "git diff/grep" use to extract funcname and words boundary for Rust has been added. * ml/userdiff-rust: userdiff: two simplifications of patterns for rust userdiff: add built-in pattern for rust
2019-05-30userdiff: two simplifications of patterns for rustJohannes Sixt1-3/+2
- Do not enforce (but assume) syntactic correctness of language constructs that go into hunk headers: we only want to ensure that the keywords actually are words and not just the initial part of some identifier. - In the word regex, match numbers only when they begin with a digit, but then be liberal in what follows, assuming that the text that is matched is syntactially correct. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-05-29userdiff: fix grammar and style issuesBoxuan Li1-2/+4
Signed-off-by: Boxuan Li <liboxuan@connect.hku.hk> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-05-19userdiff: add OctaveBoxuan Li1-1/+4
Octave pattern is almost the same as matlab, except that '%%%' and '##' can also be used to begin code sections, in addition to '%%' that is understood by both. Octave pattern is merged into Matlab pattern. Test cases for the hunk header patterns of matlab and octave under t/t4018 are added. Signed-off-by: Boxuan Li <liboxuan@connect.hku.hk> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-05-17userdiff: add built-in pattern for rustMarc-André Lureau1-0/+7
This adds xfuncname and word_regex patterns for Rust, a quite popular programming language. It also includes test cases for the xfuncname regex (t4018) and updated documentation. The word_regex pattern finds identifiers, integers, floats and operators, according to the Rust Reference Book. Cc: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-01-18Merge branch 'nd/style-opening-brace'Junio C Hamano1-1/+2
Code clean-up. * nd/style-opening-brace: style: the opening '{' of a function is in a separate line
2018-12-10style: the opening '{' of a function is in a separate lineNguyễn Thái Ngọc Duy1-1/+2
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-11-12notes-cache.c: remove the_repository referencesNguyễn Thái Ngọc Duy1-2/+3
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-10-19Merge branch 'nd/the-index'Junio C Hamano1-2/+3
Various codepaths in the core-ish part learn to work on an arbitrary in-core index structure, not necessarily the default instance "the_index". * nd/the-index: (23 commits) revision.c: reduce implicit dependency the_repository revision.c: remove implicit dependency on the_index ws.c: remove implicit dependency on the_index tree-diff.c: remove implicit dependency on the_index submodule.c: remove implicit dependency on the_index line-range.c: remove implicit dependency on the_index userdiff.c: remove implicit dependency on the_index rerere.c: remove implicit dependency on the_index sha1-file.c: remove implicit dependency on the_index patch-ids.c: remove implicit dependency on the_index merge.c: remove implicit dependency on the_index merge-blobs.c: remove implicit dependency on the_index ll-merge.c: remove implicit dependency on the_index diff-lib.c: remove implicit dependency on the_index read-cache.c: remove implicit dependency on the_index diff.c: remove implicit dependency on the_index grep.c: remove implicit dependency on the_index diff.c: remove the_index dependency in textconv() functions blame.c: rename "repo" argument to "r" combine-diff.c: remove implicit dependency on the_index ...
2018-09-21userdiff.c: remove implicit dependency on the_indexNguyễn Thái Ngọc Duy1-2/+3
[jc: squashed in missing forward decl in userdiff.h found by Ramsay] Helped-by: Ramsay Jones <ramsay@ramsayjones.plus.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-09-12Make git_check_attr() a void functionTorsten Bögershausen1-2/+1
git_check_attr() returns always 0. Remove all the error handling code of the callers, which is never executed. Change git_check_attr() to be a void function. Signed-off-by: Torsten Bögershausen <tboegi@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>