How to insert a list of scalars to a list of scalars at a specific index in the custom yaml

[dhay3]

Greeting rime maintainers and expert users,

Here is my question, I want to insert a list of custom derive directives into speller/algebra of double_pinyin.schema.yaml by double_pinyin.custom.yaml. Though it works when insert the list of custom derive directives into double_pinyin.schema.yaml before the xform directives directly, whereas I do prefer to keep that part in the double_pinyin.custom.yaml or not to use speller/algebra to replace the whole part in the custom schema yaml for the reason of rime management.

I've read the documentations of rime and rime-ice, It seems that the @[before|after] syntax does want I want. However it does not work as my expected(It transfer the \u\ to the literal u not the \sh\ in double pinyin.), after I‘ve tried this patch directive.

Now I'm not for sure if it only works for the list of mapping format in yaml( excuse me, I've not read the source code of librime, as for me it is a complicated project. ) or just my using wrong.

And I'm also read the issues and discussions of rime and rime-ice, not much useful information. By the way I'm using fcitx5-rime on Arch linux, I've found no way to debug it by fcitx5-diagnose ( if I don't miss something ). And if that is a way I'm glad to offer the information.

The part of the double_pinyin.schema.yaml looks like that.

speller:
  algebra:
    - erase/^xx$/
    - derive/^([jqxy])u$/$1v/
    - derive/^([aoe])([ioun])$/$1$1$2/ 
    - xform/^([aoe])(ng)?$/$1$1$2/
    - xform/iu$/Ⓠ/
    - xform/[iu]a$/Ⓦ/
    - xform/[uv]an$/Ⓡ/
    .....

The related snippet in double_pinyin.custom.yaml

patch:
  # Ambiguous Spell
  speller/algebra/@before 3:
     - derive/^([zcs])h/$1/
     - derive/^([zcs])([^h])/$1h$2/

Which I want to insert derive/^([zcs])h/$1/ and derive/^([zcs])([^h])/$1h$2/ before the xform/^([aoe])(ng)?$/$1$1$2/

It would be a highly appreciate if any hints.

Best regards.