For example, I'd like to not indent namespaces in C++ code, but the prefpane doesn't seem to have any place to make a decision of this granularity. Is there some hidden config file or something? Or am I just out of luck?
Choose Xcode > Preferences… from the menu bar (default shortcut: command-comma). Then click the “Text Editing” section. Then choose the “Indentation” tab.
Xcode tip #21: If you've copied code from elsewhere, such as Hacking with Swift or Stack Overflow, there's a good chance you'll paste in something with incorrect indentation. Xcode can fix this with one shortcut: select the code you want to fix, then press Ctrl+I to reindent it.
Apple's XCode documentation contains a full list of user preferences, many of them that don't have a corresponding UI. I'm not seeing anything that is namespace-specific however, so I think you might be out of luck.
However, I thought I'd pass along the preferences list in case it's useful.
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