It's difficult to get a grasp on a large Sitecore project, which is the main impetus behind writing Sitecore Doc. It generates HTML to summarize an entire Sitecore application on one page.

Sitecore solutions can become large and unweildy. Recently I was tasked with the following: Find out which page each of these service methods (40-50) are called. With how .NET and Sitecore applications (generally all good applications) are written, a service method call would be written within a component, but that component could be put on any page!

Luckily these components manifest themselves in Sitecore as "renderings". They can have data sources and parameters. And code, which is what leads us to this mess in the first place ;)

First we'd need a way to map these renderings to service calls. I came up with a generic "info" data field to do that in a JSON file which defines all of the renderings we're interested in. On a side note, I only provide those that we're interested in, this current project would yield a 4-5 MB result file which would be ridiculous if it included everything. That JSON looks like this:

{
    "includeUndefined": false,
    "renderings": [
        {
            "id": "6A8BB729-E186-45E7-A72E-E752FDEC2F48",
            "name": "AccountBalancePurgeSublayout",
            "info": [
                "CustomerInformationService.GetCardStatusV4(authHeader, accountId)",
                "CustomerInformationService.GetPurgeInfo(authHeader, accountID)"
            ]
       }
}

Using my (recently updated to accommodate this request) Go Sitecore API, I was able to take that information and map it against every page renderings (or standard values renderings) and produce a file that is filled with every page and their (eventual) calls into service methods. These aren't directly called within the page code (usually), and there's heavy caching going on as well. Here's what the output looks like:

    Name:     booking-calendar
    ID:       f1837270-6aca-4115-94bc-08d1a4ed43ad
    Path:     /sitecore/content/REDACTED/booking-calendar
    Url:      https://www.REDACTED.com/booking-calendar
    Renderings:
            Default
                CalendarBooking   
                    Path:         /layouts/REDACTED2013/REDACTED/SubLayouts/Booking/Calendar/CalendarBooking.ascx
                    Placeholder:  content 
                    Info:
                                  ReservationService.GetAllRoomTypesV2()
                                  ReservationService.GetCashCalendarV3(GetAuthHeader(),promoCode,startDate,endDate,isHearingAccess,isMobilityAccess, isWeb)
                                  ReservationService.GetCashCalendarWithArrivalV3(GetAuthHeader(), promoCode, roomType, arrivalDt, numNights, isWeb)
            Mobile
                CalendarBookingMobile   
                    Path:         /layouts/REDACTED2013/REDACTEDMobile/SubLayouts/Booking/Calendar/CalendarBookingMobile.ascx
                    Placeholder:  content 
                    Info:
                                  ReservationService.GetAllRoomTypesV2()
                                  ReservationService.GetCashCalendarV3(GetAuthHeader(),promoCode,startDate,endDate,isHearingAccess,isMobilityAccess, isWeb)
                                  ReservationService.GetCashCalendarWithArrivalV3(GetAuthHeader(), promoCode, roomType, arrivalDt, numNights, isWeb)

This was very useful for this specific task, however it's written in a way that will be very useful going forward, to provide insights into our Sitecore implementations and how the content is structured.

This app will see updates (sorry the code isn't available for now) so that it will show usages among different renderings, unused ones or broken (exists in a renderings field but not as an actual item in sitecore [was deleted or not imported]), and other stuff that I can think of. This binary is named "scdoc" as I like to keep my names short :)  The Sitecore Code Generation tool I wrote is simply "scgen".

Check out that Go Sitecore API though if you want to easily query your Sitecore database!  Happy Coding :)