Move config file default path to os.UserConfigDir()

[wijayaerick]

Related with #116

os.UserConfigDir() docs:

On Unix systems, it returns $XDG_CONFIG_HOME as specified by https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html if non-empty, else $HOME/.config. On Darwin, it returns $HOME/Library/Application Support. On Windows, it returns %AppData%. On Plan 9, it returns $home/lib.

Currently .wegorc defaults to $HOME/.wegorc in all systems. I'm proposing this logic for searching/creating the config file:

1. $WEGORC takes the highest precedence.
2. If $WEGORC is not set, try to open the config file from os.UserConfigDir()/wego/wegorc (can adjust the name, but the point is it is stored inside os.UserConfigDir)
3. If the config file is not found, fallback try to open the config file from $HOME/.wegorc for backward compatibility
4. If still now found, generate the config file
   • in $WEGORC if it is set
   • else, generate the file in os.UserConfigDir()/wego/wegorc

[Madraceee]

Hey, I wanna know the status about this issue, Is it updated?
Else i can work on this

[Madraceee]

This seems like something which has to be updated in "ingo" rather than here
Can you help me with this?

[kordianbruck]

Yep, probably line 57 and following need adaption: https://github.com/schachmat/ingo/blob/master/in.go#L57