Better support for realizing scalar YAML values

[maddenp-noaa]

Synopsis

Add YAML configuration to omit ... end-of-stream marker when dumping scalar values. For example:

Old behavior:

(DEV-uwtools) ~/git/uwtools ∴ echo "{foo: {bar: baz}}" | uw config realize --input-format yaml --output-format yaml --key-path foo.bar
baz
...

New behavior:

(DEV-uwtools) ~/git/uwtools ∴ echo "{foo: {bar: baz}}" | uw config realize --input-format yaml --output-format yaml --key-path foo.bar
baz

This supports easier lookups of single values from input configs.

Works for e.g. namelist inputs, too:

(DEV-uwtools) ~/git/uwtools ∴ echo "&nl res = 768 /" | uw config realize --input-format nml --output-format yaml --key-path nl.res
768

Type

• Enhancement (adds new functionality)

Impact

• This is a non-breaking change (existing functionality continues to work as expected)

Checklist

• I have added myself and any co-authors to the PR's Assignees list.
• I have reviewed the documentation and have made any updates necessitated by this change.

[christinaholtNOAA]

LGTM!

[WeirAE]

LGTM