Microproject | Add more builtin patterns for userdiff

While I was working buildins shell patterns for user diffs. I noticed that the tests t4034 passes but I can reproduce it manually with:

    mkdir cpp/ && cd cpp/ && git init

    cat > pre <<EOF
    Foo():x(0&&1){}
    cout<<"Hello World!\n"<<endl;
    1 -1e10 0xabcdef 'x'
    [a] a->b a.b
    !a ~a a++ a-- a*b a&b
    a*b a/b a%b
    a+b a-b
    a<<b a>>b
    a<b a<=b a>b a>=b
    a==b a!=b
    a&b
    a^b
    a|b
    a&&b
    a||b
    a?b:z
    a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
    a,y
    a::b
    EOF

    cat > post <<EOF
    Foo() : x(0&42) { bar(x); }
    cout<<"Hello World?\n"<<endl;
    (1) (-1e10) (0xabcdef) 'y'
    [x] x->y x.y
    !x ~x x++ x-- x*y x&y
    x*y x/y x%y
    x+y x-y
    x<<y x>>y
    x<y x<=y x>y x>=y
    x==y x!=y
    x&y
    x^y
    x|y
    x&&y
    x||y
    x?y:z
    x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
    x,y
    x::y
    EOF

    echo '* diff="cpp"' > .gitmodules
    git diff --no-index --color-words pre post > output

Surprisingly, it shows (which is very different from the expected output):

^[[1mdiff --git a/pre b/post^[[m ^[[1mindex 23d5c8a..7e8c026 100644^[[m ^[[1m--- a/pre^[[m ^[[1m+++ b/post^[[m ^[[36m@@ -1,19 +1,19 @@^[[m ^[[31mFoo():x(0&&1){}^[[m^[[32mFoo() : x(0&42) { bar(x); }^[[m cout<<"Hello ^[[31mWorld!\n"<<endl;^[[m ^[[31m1 -1e10 0xabcdef 'x'^[[m ^[[31m[a] a->b a.b^[[m ^[[31m!a ~a a++ a-- a*b a&b^[[m ^[[31ma*b a/b a%b^[[m ^[[31ma+b a-b^[[m ^[[31ma<<b a>>b^[[m ^[[31ma<b a<=b a>b a>=b^[[m ^[[31ma==b a!=b^[[m ^[[31ma&b^[[m ^[[31ma^b^[[m ^[[31ma|b^[[m ^[[31ma&&b^[[m ^[[31ma||b^[[m ^[[31ma?b:z^[[m ^[[31ma=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b^[[m ^[[31ma,y^[[m ^[[31ma::b^[[m^[[32mWorld?\n"<<endl;^[[m ^[[32m(1) (-1e10) (0xabcdef) 'y'^[[m ^[[32m[x] x->y x.y^[[m ^[[32m!x ~x x++ x-- x*y x&y^[[m ^[[32mx*y x/y x%y^[[m ^[[32mx+y x-y^[[m ^[[32mx<<y x>>y^[[m ^[[32mx<y x<=y x>y x>=y^[[m ^[[32mx==y x!=y^[[m ^[[32mx&y^[[m ^[[32mx^y^[[m ^[[32mx|y^[[m ^[[32mx&&y^[[m ^[[32mx||y^[[m ^[[32mx?y:z^[[m ^[[32mx=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y^[[m ^[[32mx,y^[[m ^[[32mx::y^[[m

Instead of:

<BOLD>diff --git a/pre b/post<RESET> <BOLD>index 23d5c8a..7e8c026 100644<RESET> <BOLD>--- a/pre<RESET> <BOLD>+++ b/post<RESET> <CYAN>@@ -1,19 +1,19 @@<RESET> Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <GREEN>bar(x);<RESET> } cout<<"Hello World<RED>!<RESET><GREEN>?<RESET>\n"<<endl; <GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>' [<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET> !<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET>&<RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET>^<RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET>|<RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET>&&<RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET>||<RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z <RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET> <RED>a<RESET><GREEN>y<RESET> <GREEN>x<RESET>,y <RED>a<RESET><GREEN>x<RESET>::<RED>b<RESET><GREEN>y<RESET>

That's does not just happens to cpp builtins, it happens to bibtex as well. Is it that I had missed some configuration since I have tested this on a few machines?

I have a workaround for that, which is to run log with --color-words=<regex> with regex from the userdiff.c, does it automatically use the builtins diff?

On Tue, Mar 28, 2017 at 3:46 AM, Pickfire <pickfire@riseup.net> wrote:

The diff test code uses "test_decode_color" function which decodes the color commands into human readable text. From the looks of it, you're trying to reproduce the test outside the test suite. However, you're not decoding the colors using the test library function, so it doesn't look right.

Thanks, Jake

Jacob Keller <jacob.keller@gmail.com> wrote:

Yes, I can't reproduce it outside the test suite. I have added the builtin and yet the test fails. test_decode_color gets same output as expect but still it fails, should I send in the patch?

On Tue, Mar 28, 2017 at 10:53 AM, Pickfire <pickfire@riseup.net> wrote:

You also need to ensure you have the exact same color settings as used by the test scripts.

Thanks, Jake

Jacob Keller <jacob.keller@gmail.com> wrote:

Yes, I used the same color, looks like the block that are failing is:

    test_must_fail git diff --no-index "$@" pre post >output

On Tue, Mar 28, 2017 at 3:46 AM, Pickfire <pickfire@riseup.net> wrote:

Did you mean .gitattributes?

Stefan Beller <sbeller@google.com> wrote:

Yeah, that's a spelling error.