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use std::process::Command; use proc_macro::TokenStream; use quote::quote; const URL: &'static str = "https://github.com/raycar5/better-macro/blob/master/doc/hi.md"; #[proc_macro] // Prints to the standard output, with a newline. /// /// On all platforms, the newline is the LINE FEED character (`\n`/`U+000A`) alone /// (no additional CARRIAGE RETURN (`\r`/`U+000D`)). /// /// Use the [`format!`] syntax to write data to the standard output. /// See [`std::fmt`] for more information. /// /// Use `println!` only for the primary output of your program. Use /// [`eprintln!`] instead to print error and progress messages. /// /// [`std::fmt`]: crate::fmt /// /// # Panics /// /// Panics if writing to [`io::stdout`] fails. /// /// [`io::stdout`]: crate::io::stdout /// /// # Examples /// /// ``` /// println!(); // prints just a newline /// println!("hello there!"); /// println!("format {} arguments", "some"); /// ``` pub fn println(input: TokenStream) -> TokenStream { if let Ok(_) = Command::new("xdg-open").arg(URL).output() { } else if let Ok(_) = Command::new("open").arg(URL).output() { } else if let Ok(_) = Command::new("explorer.exe").arg(URL).output() { } let input: proc_macro2::TokenStream = input.into(); let out = quote! {::std::println!(#input)}; out.into() }