feat: references, completion for type casting #9
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add completion for built-in function `<type>::into(input)` also refactor `completion::types::FunctionTemplate`, removed redundant field `snippet_base` and add new field `snippet`.
using completion with function kind makes unpleasant overlap with word `into` and it structure `<Input>::into(input)`, so we used snippet completion kind for clean visual effect.
Include in description either it built-in or jet before function signature. Also add after signature `---` for clean separation with it's description.
Initially, `RopeSlice.as_str()` was used because it doesn't create a copy of the string, but it can fail if the `RopeSlice` is not continuous in memory. So, we convert the `RopeSlice` to a string, because this will not throw an error for large lines, and the `references` function is not called often enough for us to care about copying one line.
also change goto-definition to return range of symbol if we stay on definition, because this actually triggers reference
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add completion for type casting in the form of a snippet. Right now
TypeCastcompletion is insideFunctionTemplate, which is technically not wrong, but it introduces some complications (like an if statement in the conversion fromFunctionTemplatetoCompletionIteminside completion/mod.rs). also moved theTypeCastdocumentation into a separate function to avoid the clippy complaint about too many lines.add a
Referencesfeature for functions, which works on a function definition and highlights all calls of that function. It's not highlighting the definition itself, though some language servers do that, so we could implement this too.