Is ${XDG_CONFIG_HOME:-${HOME}/.config} enough or there are more tricks to it?
Is there maybe some xdg-user-dir CONFIG or xdg-settings invocation that gives me where to expect programs' configs?
${XDG_CONFIG_HOME:-~/.config} is exactly how xdg-user-dirs does it (it's a shell script). It hasn't changed since 2008, so you can consider this to be stable.
Incidentally, you'd better not have whitespace or wildcard in the value of XDG_CONFIG_HOME. If XDG_CONFIG_HOME is unset, special characters in the home directory location are ok. Wildcards in the value of XDG_xxx_DIR also don't work, as do sequences of whitespace other than a single space.
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