use xdg-open for ubuntu16.04 and above

[knorth55]

gnome-open is removed in ubuntu 16.04 and above.
we need to use xdg-open instead.

[wkentaro]

Really. You mean it's not been installed by default anymore?

[wkentaro]

Maybe you can check existence like the following?

[knorth55]

gnome-open is remove in ubuntu 18.04 and xdg-open is used for default.
in ubuntu 16.04, you can use both probably, but my computer doesn't have gnome-open.
I have no idea that pure ubuntu 16.04 has both by default or not.

[wkentaro]

By default, gnome-open is not installed in 16.04, I think.

[knorth55]

so it is better to use xdg-open in ubuntu 16.04 and above?

[wkentaro]

My suggestion is here: #1638 (comment)
You can check xdg-open before gnome-open if you like.

[k-okada]

``` k-okada@p51s:~$ dpkg -S gnome-open libgnome2-bin: /usr/bin/gnome-open libgnome2-bin: /usr/share/man/man1/gnome-open.1.gz k-okada@p51s:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.2 LTS Release: 18.04 Codename: bionic ```-- ◉ Kei Okada 2019年10月21日(月) 0:11 Kentaro Wada <notifications@github.com>:

…

My suggestion is here: #1638 (comment) <#1638 (comment)> You can check xdg-open before gnome-open if you like. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1638?email_source=notifications&email_token=AADYNXB3OWNILKRNSISEUA3QPRYJPA5CNFSM4JCQOT3KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEBYMIVQ#issuecomment-544261206>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AADYNXG2QUFKK5N37RPHCRLQPRYJPANCNFSM4JCQOT3A> .

[wkentaro]

It seems xdg-open is installed by default. and gnome-open is not. (I checked on my computers not dockers)

[knorth55]

I update to check if xdg-open is installed and use xdg-open if it is installed and use gnome-open if xdg-open is not installed.

[wkentaro]

platform is unused?

[knorth55]

do we need platform check?

[wkentaro]

Ah, I mean you import, but never use it.

[knorth55]

I updated