rover_std: introduce new print macros

crates/rover-std/src/lib.rs

@@ -3,6 +3,7 @@ mod fs;
 mod style;
 mod url;
 
+pub mod print;
 pub mod prompt;
 pub use error::RoverStdError;
 pub use fs::Fs;

crates/rover-std/src/print.rs

@@ -0,0 +1,35 @@
+/// Prints to the standard output, with a newline.
+///
+/// Equivalent to the [`println!`] macro except that an info prefix is
+/// printed before the message.
+#[macro_export]
+macro_rules! infoln {
+    ($($t:tt)*) => {{
+        print!("{} ", $crate::Style::InfoPrefix.paint("==>"));
+        println!($($t)*);
+    }};
+}
+
+/// Prints to the standard error, with a newline.
+///
+/// Equivalent to the [`eprintln!`] macro except that a warning prefix is
+/// printed before the message.
+#[macro_export]
+macro_rules! warnln {
+    ($($t:tt)*) => {{
+        eprint!("{}: ", $crate::Style::WarningPrefix.paint("warning"));
+        eprintln!($($t)*);
+    }};
+}
+
+/// Prints to the standard error, with a newline.
+///
+/// Equivalent to the [`eprintln!`] macro except that an error prefix is
+/// printed before the message.
+#[macro_export]
+macro_rules! errln {
+    ($($t:tt)*) => {{
+        eprint!("{}: ", $crate::Style::ErrorPrefix.paint("error"));
+        eprintln!($($t)*);
+    }};
+}

crates/rover-std/src/style.rs

@@ -7,6 +7,7 @@ pub enum Style {
     Path, // File paths
     Pending,
     HintPrefix,    // "HINT:" text
+    InfoPrefix,    // "==>": text
     WarningPrefix, // "WARN:" text
     ErrorPrefix,   // "ERROR:", "error:", and "error[code]:" text
     Heading,
@@ -35,7 +36,8 @@ impl Style {
             Style::Failure => style(message_ref).red(),
             Style::WhoAmIKey | Style::NewOperationCount => style(message_ref).green(),
             Style::HintPrefix => style(message_ref).cyan().bold(),
-            Style::WarningPrefix => style(message_ref).red(),
+            Style::InfoPrefix => style(message_ref).blue().bold(),
+            Style::WarningPrefix => style(message_ref).yellow(),
             Style::ErrorPrefix => style(message_ref).red().bold(),
             Style::Variant => style(message_ref).white().bold(),
             Style::Path | Style::Heading => style(message_ref).bold(),