Dioxius macros confuse rustfmt

[uzytkownik]

Rustfmt formats:

fn Layout() -> Element {
    fn Links() -> Element {
        rsx! {
            nav {
                ul {
                    id: "main-nav",
                    class: "nav nav-pills",
                    for item in RouteDiscriminants::iter() {
                        MenuItem { item }
                    }
                }
            }
        }
    }
    rsx! {
        header {
            class: "text-bg-dark d-flex justify-content-center py-3",
            Links {}
        }
        main {
            class: "col-lg-8 mx-auto p-4 py-md-5",
            Outlet::<Route> { }
        }
    }
}

into:

fn Layout() -> Element {
    fn Links() -> Element {
        rsx! {
            nav {
            ul {
                id: "main-nav",
                class: "nav nav-pills",
                for item in RouteDiscriminants::iter() {
                MenuItem { item }
                }
            }
            }
        }
    }
    rsx! {
    header {
        class: "text-bg-dark d-flex justify-content-center py-3",
        Links {}
    }
    main {
        class: "col-lg-8 mx-auto p-4 py-md-5",
        Outlet::<Route> { }
    }
    }
}

[ytmimi]

@uzytkownik what version of rustfmt are you using? I'm unable to reproduce the issue locally building rustfmt from source.

[uzytkownik]

@ytmimi Hmm. It looks something very strange goes on with tabs. It looks like rustfmt does not convert them into spaces which seems to be strange. I would expect based on documentation to have them converted into spaces by default- hard_tabs.

Outside of that it seems to be mismatch of tab_spaces between rustfmt and editor. I disabled tabs in editor fixing the problem but it seems to me that behaviour should be clarified in documentation or (even better) hard_tabs would convert them into spaces.

[ytmimi]

Also, which configuration options are you using?

[uzytkownik]

@ytmimi None. I just run cargo fmt. No configuration.

[ytmimi]

Got it, so this was just a mismatch between rustfmt and your editors settings?

[uzytkownik]

@ytmimi Sorry. As proximate cause (which was confusing for me) yes. Though I assumed by default cargo fmt converts to spaces based on hard_tabs documentation.

[ytmimi]

I'm not sure if the issue is with rustfmt. I ran a little test, and it seems that when hard_tabs=false is set leading tab characters are replaced with spaces based on the value of tab_spaces.

Given the following input that uses tabs:

fn Layout() -> Element {
	fn Links() -> Element {
		rsx! {
			nav {
				ul {
					id: "main-nav",
					class: "nav nav-pills",
					for item in RouteDiscriminants::iter() {
						MenuItem { item }
					}
				}
			}
		}
	}
	rsx! {
		header {
			class: "text-bg-dark d-flex justify-content-center py-3",
			Links {}
		}
		main {
			class: "col-lg-8 mx-auto p-4 py-md-5",
			Outlet::<Route> { }
		}
	}
}

Running rustfmt with hard_tabs=false (the default, but I explicitly configured it) outputs:

fn Layout() -> Element {
    fn Links() -> Element {
        rsx! {
            nav {
                ul {
                    id: "main-nav",
                    class: "nav nav-pills",
                    for item in RouteDiscriminants::iter() {
                        MenuItem { item }
                    }
                }
            }
        }
    }
    rsx! {
        header {
            class: "text-bg-dark d-flex justify-content-center py-3",
            Links {}
        }
        main {
            class: "col-lg-8 mx-auto p-4 py-md-5",
            Outlet::<Route> { }
        }
    }
}

[ytmimi]

Let me know if you're able to recreate the scenario (and provide sample input) that lead to the odd indentation you noted in your original comment