yaml multi document markers

[electriquo]

How to select specific YAML document markers?

For example,

---
foo: bar
---
foo: baz
---
foo: spam

How to tell dasel to select the second foo?

[TomWright]

When reading multiple documents dasel stores them internally as a list, allowing you to access them as follows:

$ echo '---
foo: bar
---
foo: baz
---
foo: spam' | dasel -r yaml '.[1].foo'
baz

[electriquo]

Maybe it worth to document it around https://daseldocs.tomwright.me/selectors/all-indexes

[electriquo]

Assume the document are differentiated with an anchor key, such as doc.
How can dasel select a specific document given the doc value.

For example, having the following YAML

doc: 1
foo: bar
---
doc: 3
foo: baz
---
doc: 2
foo: spam

How can dasel select the document where doc equals 3 and return

doc: 3
foo: baz

[TomWright]

You can use the dynamic selector in that case:

$ echo 'doc: 1
foo: bar
---
doc: 3
foo: baz
---
doc: 2
foo: spam' | dasel -r yaml '.(doc=3).foo'
baz

[TomWright]

Also, there is some docs around the formatting of multi-document files here: https://daseldocs.tomwright.me/usage/supported-file-types#multi-document-files-1

[electriquo]

THANK YOU!

[macmiranda]

@TomWright I'm trying to do the same with v3 but get

dasel: error: error parsing selector: failed to parse: unexpected token 29 "." at position 0.

Is there a way to achieve the same in v3? My use case is: iterating through a multi-document yaml and outputting each doc to a separate file.