Previously `new` was operating under the assumption that it was always
going to be creating a new project/stack, and would always prompt for
these values. However, we want to be able to use `new` to pull down the
source for an existing stack. This change adds a `--stack` flag to `new`
that can be used to specify an existing stack. If the specified stack
already exists, we won't prompt for the project name/description, and
instead just use the existing stack's values. If `--stack` is specified,
but doesn't already exist, it will just use that as the stack name
(instead of prompting) when creating the stack. `new` also now handles
configuration like `up <url>`: if the stack is a preconfigured empty
stack (i.e. it was created/configured in the Pulumi Console via Pulumi
Button or New Project), we will use the existing stack's config without
prompting. Otherwise we will prompt for config, and just like `up
<url>`, we'll use the existing stack's config values as defaults when
prompting, or if the stack didn't exist, use the defaults from the
template.
Previously `up <url>`'s handling of the project name/description wasn't
correct: it would always automatically use the values from the template
without prompting. Now, just like `new`:
- When updating an existing stack, it will not prompt, and just use the
existing stack's values.
- When creating a new stack, it will prompt for the project
name/description, using the defaults from the template.
This PR consolidates some of the `new`/`up` implementation so it shares
code for this functionality. There's definitely opportunities for a lot
more code reuse, but that cleanup can happen down the line if/when we
have the cycles.
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