In tagmanager/src/tm_ctags_wrappers.h:

> + */
> +
> +#ifndef TM_CTAGS_WRAPPERS
> +#define TM_CTAGS_WRAPPERS
> +
> +#include <glib.h>
> +
> +#include "tm_parser.h"
> +
> +#include "entry.h" /* for sTagEntryInfo */
> +
> +
> +G_BEGIN_DECLS
> +
> +typedef gboolean (*tm_ctags_callback) (const tagEntryInfo *const tag,
> +	gboolean invalidate, void *user_data);

It also seems to have a strange signature only targeted at our very specific usage, although it suggest it's meant to be a generic API. By that I mean the invalidate parameter, that seem more like a step indicator that might be better served as an enum, or at least rather name it something like "initialize" or something more generic.

But maybe

typedef enum TMCtagsParsingStep
{
    TM_CTAGS_PARSING_STEP_INITIALIZE,
    TM_CTAGS_PARSING_STEP_EMIT_TAG,
    // ... possibly _FINALIZE too
}

Or something. Or, if we can be sure tag is never NULL when emitting tags, rely only on this?

Also, documentation on this callback would be great :)

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