fix: show non-existent plugin config

[iyear]

Pre-Checklist

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Description

I remove the default value of template. We can discuss better solution.

Related Issues

close #841

New Behavior (screenshots if needed)

[iyear]

In #795 , @IronCore864 thinks that templates are less suitable to be exported by command, but are suitable to be placed under /examples. The user gets the yaml file as a download.

Now two concurrent quickstart.yaml and gitops.yaml are preventing maintainability. If a solution can be discussed, I can fix it in the meantime.

@daniel-hutao @aFlyBird0

[daniel-hutao]

In #795 , @IronCore864 thinks that templates are less suitable to be exported by command, but are suitable to be placed under /examples. The user gets the yaml file as a download.

Now two concurrent quickstart.yaml and gitops.yaml are preventing maintainability. If a solution can be discussed, I can fix it in the meantime.

@daniel-hutao @aFlyBird0

@iyear I've left a comment under #795. Let's have more discussions there.

[daniel-hutao]

For quickstart printing logic, my original design was "when -p does not exist, -t defaults to equal quickstart when -t is not set; when -p exists, -t does not take effect".

We can follow this idea to fix it first. As for whether to delete the logic of quickstart configuration printing, we can wait until the end of the #795 discussion and implement it in a separate pr. @iyear

[daniel-hutao]

see #847 (comment)

[iyear]

@daniel-hutao

devstream/internal/pkg/show/config/config.go

Lines 22 to 24 in 2c8ba2d

	plugin := viper.GetString("plugin")
	if plugin == "" {
	fmt.Println(DefaultConfig)

Then I have to remove this code.
Only one of the -p and -t args can be allowed to carry a default value.

[daniel-hutao]

I looked at the code and we need to prioritize support for default config printing, i.e. dtm show config can only print internal/pkg/show/config/default.yaml. so we had to drop the default printing logic for quickstart. So, let's just keep the -t quickstart support.

@iyear Please also check if the documentation needs to be updated.

Releated issue: #597

[iyear]

@daniel-hutao Is it possible to review and then merge in? I will start working on #795, otherwise it will cause a conflict.