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Exuberant Ctags: undocumented extension fields

I'm looking at the tags file that Exuberant Ctags generated for my ruby project, and reading the documentation for the Tag File Format:

tag_name<TAB>file_name<TAB>ex_cmd;"<TAB>extension_fields

My tags file has lots of lines like:

MyThing<TAB>lib/my_thing.rb<TAB>/^class MyThing$/;"<TAB>c

It's just my burning curiosity, but I can't find any explanation of what the trailing <TAB>c extension field indicates.

Solution

  • After downloading the ctags source (and indexing it with ctags), I see in ruby.c that the extension fields are pretty simple:

    /*
*   DATA DEFINITIONS
*/
static kindOption RubyKinds [] = {
    { TRUE, 'c', "class",  "classes" },
    { TRUE, 'f', "method", "methods" },
    { TRUE, 'm', "module", "modules" },
    { TRUE, 'F', "singleton method", "singleton methods" }
};