XDG Base Directory Specification

[noraj]

Like briefly mentioned in #329, the current config path is a custom arbitrary one: ~/.sqlcmd/sqlconfig as explained in the documentation.

However having ~2000 "dotfiles" and "dotfolders" in $HOME is a bit anoying and messy.

That is why I suggest implementing a XDG compliant config deployment.

• Specs: XDG Base Directory Specification
• Env vars: XDG_CONFIG_HOME (default to $HOME/.config for users) and XDG_CONFIG_DIRS (default to /etc/xdg for system)
• Go libs: go-appdir (archived) - configdir (abandoned) - kyoh86/xdg (archived) - adrg/xdg (up to date)

The idea would be to have ~/.config/sqlcmd/sqlcmd instead of the legacy ~/.sqlcmd/sqlconfig (that could be kept as fallback for retro-compatibility).