Instructions: Replace the template text and remove irrelevant text (including this line)

Hi, Bram.
I'm a you and Vim's fan!

Is your feature request related something that is currently hard to do? Please describe.

I want to introduce the string interpolation (the template string) into Vim script.

Now it is introduced onto

• JavaScript
  • and TypeScript
• Kotlin
• Scala
• Ruby
• C#
• Swift

I never contributed Vim yet, but this is not so hard in my opinion...

Describe the solution you'd like

A clear and concise description of what you want to happen.

'The string interpolation' ('The template string') embeds any expressions ${x} into a string via Vim function string().

For example.

" Embed literals using back quotations (the template string) and "${" "}"
call assert_equal(`I have ${10}`, 'I have 10')
call assert_equal(`I'm a ${'vim'}`, "I'm a vim")

" Variables
let x = 10
call assert_equal(`I have ${x}`, 'I have 10')

" Others
let x = ch_open('localhost:25252')  " dummy
call assert_equal(`${x}`, string(x))

I'm refering to the JavaScript's format of ${x} for the Vim script's template string.
(${x} ${dict.a} ${10} ${function('function')})

These expressions must be surrounded by "${" and "}".

I'm implementing it now at this branch.
The test can be shown at here 👇

• vim/test_string_interpolation.vim at ec933cee9d9cb2b1bd5b3f3fa69f8dc214989c2a - aiya000/vim - GitHub

Please see this ☝️ if you can!

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

I'm planning a template string form $"I'm ${name}" (surrounded by $" and ")
if Bram doesn't like a back quoted form I'm ${name}.

Additional context

After it introduced, expression embedding is to be more easier, and I think it is very cool!

Thanks!