Modify 'transpiler' behaviour when empty string passed as R component prefix

[rpkyle]

Currently, R components may be generated for Dash using the syntax

dash-generate-components ./src/components dash_core_components --r-prefix="dcc"

When --r-prefix is blank, the 'transpiler' assumes dash is the prefix. This is undesirable for third party components, or libraries such as dash-canvas, which already include "dash" in their names.

Alternatively, a better strategy for the 'transpiler' behaviour might be to accept a blank string, e.g.

dash-generate-components ./src/lib/components dash_canvas --r-prefix=""

Then, then the 'transpiler' could generate a properly camelCase function name, i.e. dashCanvas instead of DashCanvas.

This would maintain parity with existing Plotly component libraries, and further standardize function naming. These details seem minor, but as R is case-sensitive, they remain important.

@alexcjohnson

[alexcjohnson]

Yes, --r-prefix="" converting to camelCase sounds perfect. Good catch!