%LOCALAPPDATA% on Windows. Or better still, use GetAppContainerFolderPath or SHGetKnownFolderPath with FOLDERID_LocalAppData.
replyI don't know if anyone is actually using roaming profiles, but config should go into the %APPDATA% folder to support that. %LOCALAPPDATA% is for things that shouldn't be synced to different machines, such as caches.
replyI know we used to use them in our corporate environment. Not sure if we still do, or if they gave up and called OneDrive “good enough”.
replyIt all sounds so easy, until you learn about the XDG Base Directory Specification[1]. You're actually supposed to do a whole song and dance around a hierarchical set of environment variables, associated defaults, and resolution orders.
replyInterfacing with people is never easy.
No. Actually, it's easy. Just check for directory or use a fallback. For example here's how you'd do this in bash:
reply export CONFIG_DIR="${XDG_CONFIG_HOME:-$HOME/.config}"
export CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}"
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