Run schematic task in child directory.

[Bored-Bohr]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request

Command (mark with an x)

- [x] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Versions

node: v8.12.0 npm: 6.4.1 Angular CLI: 7.0.4 OS: win32 x64 (OS Build 14393.2551)

Repro steps

context.addTask(new RunSchematicTask(schematicName, options));

Desired functionality

I believe that it would be useful to be able to execute a schematic task from the child directory. Currently, new RunSchematicTask generates a HostTree from the current host and transfers the parentContext.

It would be useful for a case such as running a schematic in ng-new as a task that installs dependencies and calls _readPackageJson which relies on an absolute path for the package.json.

[angular-robot[bot]]

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