feat: auto import all missing items

[discord9]

Related Issue

#12761

Import all missing items

add a new assist to automatically import all missing items in scope.
For now it will only pick the most likely import when multiple import choices is found, this might could be improved by asking user which one do they want, but I can't figure out how to do that now

[nemethf]

this might could be improved by asking user which one do they want, but I can't figure out how to do that now

Rust-analyzer can potentially ask the user by sending a ShowMessage Request. (It seems the current code does not contain an example for this)

[discord9]

this might could be improved by asking user which one do they want, but I can't figure out how to do that now

Rust-analyzer can potentially ask the user by sending a ShowMessage Request. (It seems the current code does not contain an example for this)

is adding this two methods to Assists a good idea?:

    /// For scenarios where the user needs to select one or more options from a predefined list
    pub(crate) fn add_multi_select_choice(
        &mut self,
        group: &GroupLabel,
        id: AssistId,
        label: impl Into<String>,
        target: TextRange,
        choices: Vec<Vec<String>>,
        f: impl FnOnce(&mut SourceChangeBuilder, &[String]),
    ) -> Option<()> {
        todo!()
    }

    /// For scenarios requiring sequential, stateful interactions where choices influence subsequent steps.
    pub(crate) fn add_multi_step_choice(
        &mut self,
        group: &GroupLabel,
        id: AssistId,
        label: impl Into<String>,
        target: TextRange,
        first_choice: Vec<String>,
        f: Vec<Box<dyn FnOnce(&mut SourceChangeBuilder, &str)->Vec<String>>>,
    ) -> Option<()> {
        todo!()
    }

[nemethf]

is adding this two methods to Assists a good idea?:

I'm not qualified to determine that, but ...

/// For scenarios where the user needs to select one or more options from a predefined list

... a single ShowMessage request cannot be used to select more than one options. However, multiple requests can achieve this. For example, if there are three options: A, B, C, then the user can select A and B with the following exchange:

sequenceDiagram

RA ->> LSP Client: ShowMessageRequest(["[ ] Option A", "[ ] Option B", "[ ] Option C", "Proceed") 
LSP Client ->> RA: ActionItem("[ ] Option B")
RA ->> LSP Client: ShowMessageRequest(["[ ] Option A", "[X] Option B", "[ ] Option C", "Proceed") 
LSP Client ->> RA: ActionItem("[ ] Option A")
RA ->> LSP Client: ShowMessageRequest(["[X] Option A", "[X] Option B", "[ ] Option C", "Proceed") 
LSP Client ->> RA: ActionItem("Proceed")

Loading

[discord9]

is adding this two methods to Assists a good idea?:

I'm not qualified to determine that, but ...

/// For scenarios where the user needs to select one or more options from a predefined list

... a single ShowMessage request cannot be used to select more than one options. However, multiple requests can achieve this. For example, if there are three options: A, B, C, then the user can select A and B with the following exchange:

sequenceDiagram

RA ->> LSP Client: ShowMessageRequest(["[ ] Option A", "[ ] Option B", "[ ] Option C", "Proceed") 
LSP Client ->> RA: ActionItem("[ ] Option B")
RA ->> LSP Client: ShowMessageRequest(["[ ] Option A", "[X] Option B", "[ ] Option C", "Proceed") 
LSP Client ->> RA: ActionItem("[ ] Option A")
RA ->> LSP Client: ShowMessageRequest(["[X] Option A", "[X] Option B", "[ ] Option C", "Proceed") 
LSP Client ->> RA: ActionItem("Proceed")

Loading

Unable to render rich display

sequenceDiagram

RA ->> LSP Client: ShowMessageRequest(["[ ] Option A", "[ ] Option B", "[ ] Option C", "Proceed")
LSP Client ->> RA: ActionItem("[ ] Option B")
RA ->> LSP Client: ShowMessageRequest(["[ ] Option A", "[X] Option B", "[ ] Option C", "Proceed")
LSP Client ->> RA: ActionItem("[ ] Option A")
RA ->> LSP Client: ShowMessageRequest(["[X] Option A", "[X] Option B", "[ ] Option C", "Proceed")
LSP Client ->> RA: ActionItem("Proceed")

Yes, I don't mean mutli-select, but providing multiple question each with choices(and user choose one from each), I think that's likely the suitable way(a good enough api on the Assist side) to do it and decide to proceed to impl that