You have to update Kate and KTextEditor as well, since the External Tools plugin uses new API that was added later.

I suggest you use the AppImage or similar instead, e.g.:
https://binary-factory.kde.org/job/Kate_Release_appimage/

Best regards
Dominik

Bohdan Mushkevych <mushkevych@gmail.com> schrieb am Do., 23. Juli 2020, 21:20:
Greetings

Just wondering if you could advise on how to install "External Tools" into Kate on Ubuntu 18.04?

Sincerely,
Dan

On Sun, 12 Jul 2020 at 20:41, Bohdan Mushkevych <mushkevych@gmail.com> wrote:
Hi Chenxiong

Thank you for the email and please excuse late reply.

I see this plugin in kate/addons github repository [1], but I am not sure where to look for build instructions. Also - it doesn't seem as Ubuntu 18.04 LTS has anything like kdeaddons or similar package.

Could you please advise on how to install "External Tools" into Kate on Ubuntu 18.04?

Sincerely,
Dan


On Tue, 7 Jul 2020 at 20:06, Chenxiong Qi <qcxhome@gmail.com> wrote:
Hi Bohdan,

External Tools plugin has a predefined "JSON Format Full File". Maybe
you can have a try.

On 7/2/20 5:41 AM, Bohdan Mushkevych wrote:
> Hi
>
> First of all - thank you great text editor Kate.
> Recently I started looking on how to add a simple command to format
> JSON, and tried to follow the blogpost from 2009 [1].
> However it did not work for me.
>
> Perhaps you have a Github example of how-to a simple custom command
> would look like?
> Afterall, I probably don't need a long blog post - just a source code to
> peek into.
>
> Sincerely,
> Dan
>
> [1]
> https://kate-editor.org/2009/10/29/extending-kate-with-scripts/