Computed value with reference to other symbols

[MiguelGuedelha]

Is your feature request related to a problem? Please describe.

Consider a template that sets Product and PackageId parameters in its csproj file as follows

For example:

<Product>Umbraco.Community.PackageName</Product>
<PackageId>Umbraco.Community.PackageName</PackageId>

PackageName is the source name (so it will get replaced with whatever the -n parameter value is set to)

Umbraco.Community is simply an allowed prefix in the Umbraco community commonly used to prefix packages related to it.

However, some companies/individuals might want to have their own fully qualified ID that doesn't include Umbraco.Community for varied reasons (want it to be tied to their own company's name, etc)

I though the template could be adapted to support this in some way but the attempts I tried don't seem to work.

Describe the solution you'd like.

Something of the sorts:

csproj:

...rest of config
<Product>PACKAGE_PREFIXPackageName</Product>
<PackageId>PACKAGE_PREFIXPackageName</PackageId>
...rest of config

template.config snippet:

...rest of config
"useDefaultPrefix": {
  "description": "Whether to use the default 'Umbraco.Community' prefix for the package id or if just the name should be used, as it is already a fully qualified",
  "type": "parameter",
  "datatype": "bool",
  "defaultValue": "true"
},
 "packagePrefix": {
 "type": "computed",
 "value": "(useDefaultPrefix ? (\"Umbraco.Community\" + \".\") : (\"\"))",
 "replaces": "PACKAGE_PREFIX"
},
...rest of config

Is this or similar already possible in some way?

Additional context

No response

[MiguelGuedelha]

Had a bit of a thought about it more and it can simply be achieved with:

template.config

"useDefaultPackagePrefix": {
  "description": "Whether to use the default 'Umbraco.Community' prefix for the package id or just the template name as is.",
  "type": "parameter",
  "datatype": "bool",
  "defaultValue": "true"
},
"packagePrefixGen": {
  "type": "generated",
  "generator": "switch",
  "replaces": "PACKAGE_PREFIX",
  "parameters": {
    "cases": [
      {
        "condition": "(useDefaultPrefix)",
        "value": "Umbraco.Community."
      },
      {
        "condition": "(!useDefaultPrefix)",
        "value": ""
      }
    ]
  }
},

---

However, for the sake of another thought experiment would it be possible in some way, if I had the csproj configured as below instead:

<Product>PACKAGE_ID</Product>
<PackageId>PACKAGE_ID</PackageId>

And I wanted PACKAGE_ID to be a computation of:

Default prefix + source name, if useDefaultPackagePrefix is true
Source name, if useDefaultPackagePrefix is false
Custom prefix + "." + Source name if another 3rd parameter "PackagePrefix" is set

Third option is more of a case of wanting the project/solution to not have any prefixes in the assembly namespaces, but wanting the package ID to still have the prefix, for example:

-n MyPackage --useDefaultPackagePrefix false --PackagePrefix Org.Contoso

So classes, and the solution in general would just have "MyPackage" as the base assembly namespace, but the NuGet package would be Org.Contoso.MyPackage

(any other way of simplifying the above would be acceptable either as I might be over complicating it)