Add more single valued functions to `_HT*` transformations

[gre9ory]

State

At the moment it is possbile to prefix get transformations _HT* with serialization instructions to get string representations of dictionaries and arrays. Allowed prefixes are:

• toJson
• toRawJson
• toPrettyJson
• toYaml
• toString

Feature Idea

Extend prefix usage to include more standard operations on single values (without additional arguments). Possibilites:

• lower, upper, title, untitle, ... for strings
• int, float64, ... for numbers
• ...

Full list of possible prefixes/functions is here

Future:

Maybe extend to functions with additional arguments but that may stand in contradiction to the idea that _HT* should be simple and easy to use?

[gre9ory]

Instead of implementation heavy adding of new prefixes etc. to _HT* paths, this is now possible by simply using _HT* references inside _HT! and _HT? templating code.

So for example instead of using this expression:

NotifierUrl: _HT!{{ default "" (index . "$").Values.hull.config.general.data.endpoints.vidieditor.uri.notifier | trimSuffix "/" }}

you can alternatively now use:

NotifierUrl: _HT!{{ default "" _HT*hull.config.general.data.endpoints.vidieditor.uri.notifier | trimSuffix "/" }}

or even shorter for single templating operations with _HT!*:

NotifierUrl: _HT!* default "" _HT*hull.config.general.data.endpoints.vidieditor.uri.notifier | trimSuffix "/"

Technically, the detected _HT* references are expanded to a Go templateting reference before tpl evaluation. For example. the above used reference

_HT*hull.config.general.data.endpoints.vidieditor.uri.notifier

becomes

(index (index (index (index (index (index (index (index (index . "$").Values "hull") "config") "general") "data") "endpoints") "vidieditor") "uri") "notifier")

before template evaluation.

In summary, this solution preserves all degrees of freedom for working with templating expressions while only adding a minimal typing overhead to any solution based on extending the _HT* capabilities.

Available starting with Releases:

1.30.3 1.29.10 1.28.17