leptos_dx: rust-analyzer support in Kate

[s-mayrh]

Kate's LSP client configuration is its own science. Therefore I want to share my configuration that includes ssr and leptosfmt override:

{
    "servers": {
        "rust": {
            "initializationOptions": {
                "procMacro": {
                    "ignored": {
                        "leptos_macro": [
                            "server"
                        ]
                    }
                },
                "cargo": {
                    "features": ["ssr"]
                },
                "rustfmt": {
                    "overrideCommand": [
                        "leptosfmt", "--stdin", "--rustfmt"
                    ]
                }
            }
        }
    }
}

I did not include the comments

// optional:
// "component",
…
// if code that is cfg-gated for the `ssr` feature is shown as inactive,
// you may want to tell rust-analyzer to enable the `ssr` feature by default
//
// you can also use `rust-analyzer.cargo.allFeatures` to enable all features

because a warning appears that the JSON was invalid if comments are in them. Maybe someone can incorporate this in the book or find another good place where Kate users can find it and @bram209 might find this useful as well for rustfmt.

[s-mayrh]

Figured out how to do this on a per-project basis: You need to create a .kateproject file in your Leptos project's root directory that looks like this:

{
    "files": [
        {
            "git": 1
        }
    ],
    "lspclient": {
        "servers": {
            "rust": {
                "initializationOptions": {
                    "procMacro": {
                        "ignored": {
                            "leptos_macro": [
                                "server"
                            ]
                        }
                    },
                    "cargo": {
                        "features": [
                            "ssr", "hydrate"
                        ]
                    },
                    "rustfmt": {
                        "overrideCommand": [
                            "leptosfmt", "--stdin", "--rustfmt"
                        ]
                    }
                }
            }
        }
    }
}

Setting the initial example above in the Kate settings, like I did before, will brake rust-analyzer for other projects not using leptos.