Different syntax highlighting for sub-types of comments (?)

I'm working in TextMate2, but this question may apply to other text editors as well.

My script is in R. I intend to use rmarkdown::render() on the script to create a "report".

The clever part of these reports is that they distinguish between the standard comment symbol in R (#), and the following:

1. #' indicates markdown, like in roxygen,
2. #+ indicates that a knitr code chunk will follow

I suck at editing TextMate2 bundles. I managed to get hotkeys set up to comment out lines with #' and #+, and to do it with proper indentation. Now, I wish I could edit my theme (which I designed in TextMate1) to make one of those "special" comments a different color.

I've edited the R bundle's language grammar (this is how the file starts):

{   patterns = (
        {   name = 'comment.line.pragma-mark.r';
            match = '^(#pragma[ \t]+mark)[ \t](.*)';
            captures = {
                1 = { name = 'comment.line.pragma.r'; };
                2 = { name = 'entity.name.pragma.name.r'; };
            };
        },
        {   begin = '(^[ \t]+)?(?=#)';
            end = '(?!\G)';
            beginCaptures = { 1 = { name = 'punctuation.whitespace.comment.leading.r'; }; };
            patterns = (
                {   name = 'comment.line.number-sign.r';
                    begin = '#';
                    end = '\n';
                    beginCaptures = { 0 = { name = 'punctuation.definition.comment.r'; }; };
                },
            );
        },

And inserted the following into the middle, hoping it would let me specify a new scope for syntax highlighting:

        # START MY STUFF
        {   begin = '(^[ \t]+)?(?=#'')';
            end = '(?!\G)';
            beginCaptures = { 1 = { name = 'punctuation.whitespace.comment.leading.r'; }; };
            patterns = (
                {   name = 'comment.line.number-sign-tick.r';
                    begin = "#'";
                    end = '\n';
                    beginCaptures = { 0 = { name = 'punctuation.definition.comment.r'; }; };
                },
            );
        },
        # END MY STUFF

If it would help, I could provide the rest of the language grammar, but I'm not sure it's relevant here.

I tried to be more specific when redefining the comment in the theme (previous was just comment, which I changed to comment.line.number-sign.r). Here are (what I think are) the relevant lines of the theme:

{   name = 'Comment';
            scope = 'comment.line.number-sign.r';
            settings = {
                fontStyle = 'italic';
                foreground = '#279797';
            };
        },
        {   name = 'Comment';
            scope = 'comment.line.number-sign-tick.r';
            settings = {
                fontStyle = 'italic';
                foreground = '#C5060B';
            };
},

So far, I cannot achieve any difference in the syntax highlighting of a line that starts with # versus a line that starts with #'. I can get both to change, but no independently. Any help in figuring out how to achieve different syntax highlighting for those two would be great.

TextMate is preferring the first scope, comment.line.number-sign.r to your custom grammars. All I did is paste your code above my comment.line.number-sign.r definition, instead of after as you had indicated, and expanded upon your existing grammar/theme.

Here's what I've got:

In Bundle Editor-> R -> Language Grammars -> R

{   patterns = (
        //default block
        {   name = 'comment.line.pragma-mark.r';
            match = '^(#pragma[ \t]+mark)[ \t](.*)';
            captures = {
                1 = { name = 'comment.line.pragma.r'; };
                2 = { name = 'entity.name.pragma.name.r'; };
            };
        },
        //your block
        {   begin = '(^[ \t]+)?(?=#'')';
            end = '(?!\G)';
            beginCaptures = { 1 = { name = 'punctuation.whitespace.comment.leading.r'; }; };
            patterns = (
                {   name = 'comment.line.number-sign-tick.r';
                    begin = "#'";
                    end = '\n';
                    beginCaptures = { 0 = { name = 'punctuation.definition.comment.r'; }; };
                },
            );
        },
        //my block
        {   begin = '(^[ \t]+)?(?=#\+)';
            end = '(?!\G)';
            beginCaptures = { 1 = { name = 'punctuation.whitespace.comment.leading.r'; }; };
            patterns = (
                {   name = 'comment.line.number-sign-plus.r';
                    begin = '#\+';
                    end = '\n';
                    beginCaptures = { 0 = { name = 'punctuation.definition.comment.r'; }; };
                },
            );
        },
        //default caption block
        {   begin = '(^[ \t]+)?(?=#)';
            end = '(?!\G)';
            beginCaptures = { 1 = { name = 'punctuation.whitespace.comment.leading.r'; }; };
            patterns = (
                {   name = 'comment.line.number-sign.r';
                    begin = '#';
                    end = '\n';
                    beginCaptures = { 0 = { name = 'punctuation.definition.comment.r'; }; };
                },
            );
        },
        //... 

And then, in my theme:

        //...
        {   name = 'Comment';
            scope = 'comment.line.number-sign.r';
            settings = {
                fontStyle = 'italic';
                foreground = '#279797';
            };
        },
        {   name = 'Comment';
            scope = 'comment.line.number-sign-tick.r';
            settings = {
                fontStyle = 'italic';
                foreground = '#C5060B';
            };
        },
        {   name = 'Comment';
            scope = 'comment.line.number-sign-plus.r';
            settings = {
                fontStyle = 'italic';
                foreground = '#ff00ff';//fix this color(!)
            };
        },
    );
}

I don't use R, so I just Googled for a quick example with all 3 kinds of comments. Here's the file I used to test.

A screenshot of what I'm seeing: