[feat] Add Output_Folder_Name in generate client

[debasisdwivedy]

Product

BAML

Problem Statement / Use Case

Hi,

Currently the generators.baml file does not provide any option to name the folder of the client. It only supports folder name baml_client .
Even though we can have different output directory for multiple clients, it would be convenient if we can name have a field called output_dir_name where we can name it whatever we want instead of sticking to baml_client. The default of output_dir_name can be set to baml_client but the user can change it if the desire to do so

Proposed Solution

generator.baml

// This helps use auto generate libraries you can use in the language of
// your choice. You can have multiple generators if you use multiple languages.
// Just ensure that the output_dir is different for each generator.
generator target {
    // Valid values: "python/pydantic", "typescript", "go", "rust", "ruby/sorbet", "rest/openapi"
    output_type "python/pydantic"

    // Where the generated code will be saved (relative to baml_src/)
    output_dir "../"
    output_dir_name "pydantic_client"

    // The version of the BAML package you have installed (e.g. same version as your baml-py or @boundaryml/baml).
    // The BAML VSCode extension version should also match this version.
    version "0.218.1"

    // Valid values: "sync", "async"
    // This controls what `b.FunctionName()` will be (sync or async).
    default_client_mode sync
}

This should create the generated clients/types in pydantic_client folder instead of `baml_client.

Alternative Solutions

Workaround is creating separate folders for each generated types as below:

• "python/baml_client"
• "typescript/baml_client"
• "ruby/baml_client"

Instead we can make it as below:

• "pydantic_client"
• "ts_client"
• "ruby_client"

Additional Context

The easiest way that i can think of is to keep output_dir/output_dir_name/ in sync with output_dir/baml_client/ whenever new files are generated.

[linear]

BAML-581

[aaronvg]

this would be an easy win, thanks for the feedback