diff --git a/msp430-asm/Cargo.toml b/msp430-asm/Cargo.toml
index 6192e9d..d7a82c5 100644
--- a/msp430-asm/Cargo.toml
+++ b/msp430-asm/Cargo.toml
@@ -10,5 +10,4 @@ publish.workspace = true
 
 [dependencies]
 libmsp430 = { path = ".." }
-anes = { version = "0.2.0" }
 argp = { version = "0.3.0" }
diff --git a/msp430-asm/src/lib.rs b/msp430-asm/src/lib.rs
index 715377c..33b77d4 100644
--- a/msp430-asm/src/lib.rs
+++ b/msp430-asm/src/lib.rs
@@ -62,12 +62,31 @@ pub mod split_twice {
 pub mod cursor {
     use std::fmt::{Arguments, Display};
 
-    pub macro csi($($t:tt)*) {format_args!("\x1b[{}", format_args!($($t)*))}
+    /// Moves to the {line}th previous line
+    pub macro previous($line:literal) {
+        csi!("{}F", $line)
+    }
 
-    pub macro color($fg:expr, $($t:tt)*) {
+    /// Injects a Command Sequence Introducer
+    pub macro csi($($t:tt)*) {
+        format_args!("\x1b[{}", format_args!($($t)*))
+    }
+
+    /// Formats the args with a foreground [Color]
+    pub macro fg($fg:expr, $($t:tt)*) {
         Colorized::new(Some($fg), None, format_args!($($t)*))
     }
 
+    /// Formats the args with a background [Color]
+    pub macro bg($bg:expr, $(t:tt)*) {
+        Colorized::new(None, Some($bg), format_args!($($t)*))
+    }
+
+    /// Formats the args with both a foreground and background [Color]
+    pub macro color($fg:expr, $bg:expr, $($t:tt)*) {
+        Colorized::new(Some($fg), Some($bg), format_args!($($t)*))
+    }
+
     #[derive(Clone, Copy, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
     pub enum Color {
         #[default]
diff --git a/msp430-asm/src/main.rs b/msp430-asm/src/main.rs
index a40c4d0..910892e 100644
--- a/msp430-asm/src/main.rs
+++ b/msp430-asm/src/main.rs
@@ -7,7 +7,7 @@ use libmsp430::{
     parser::{error::Error as PError, Parser},
 };
 use msp430_asm::{
-    cursor::{color, Color::*},
+    cursor::{fg, Color::*},
     split_twice::SplitTwice,
 };
 use std::{
@@ -19,103 +19,16 @@ fn main() -> Result<(), Box<dyn Error>> {
     let mut buf = String::new();
     if let Some(file) = parse_args_or_exit::<args::Args>(argp::DEFAULT).file {
         buf = std::fs::read_to_string(file)?;
-    } else if !stdin().is_terminal() {
-        // if stdin is not a terminal, don't parsecheck each line.
-        stdin().lock().read_to_string(&mut buf)?;
-    } else {
+    } else if stdin().is_terminal() {
         // if stdin is a terminal, enter parse-checked REPL mode.
         repl::repl(&mut buf)?;
+    } else {
+        // if stdin is not a terminal, don't parsecheck each line.
+        stdin().lock().read_to_string(&mut buf)?;
     }
     asm(&buf)
 }
 
-mod args {
-    use argp::FromArgs;
-    use std::path::PathBuf;
-
-    /// Assembles MSP430 assembly into 16-bit little-endian machine code.  \
-    /// If used interactively, syntax is checked on a per-line basis.
-    #[derive(Debug, FromArgs)]
-    pub struct Args {
-        /// File to load. If not provided, takes input from stdin.
-        #[argp(option, short = 'f')]
-        pub file: Option<PathBuf>,
-    }
-}
-mod repl {
-    use super::*;
-    use anes::MoveCursorToPreviousLine;
-    use std::io::{stderr, Write};
-
-    // macro color ($color: expr, $fmt: literal, $($str: expr),*) {
-    //     format_args!(concat!("{}", $fmt, "{}"), ::anes::SetForegroundColor($color),$($str,)*
-    // ::anes::ResetAttributes) }
-
-    macro linenr($n: expr) {
-        format_args!("{:4}: ", $n)
-    }
-
-    macro printfl ($($x: expr),+) {
-        {print!($($x),+); let _ = ::std::io::stdout().flush();}
-    }
-
-    macro move_cursor($x:expr, $y:expr) {
-        format_args!("{}{}", ::anes::MoveCursorToPreviousLine($x), "")
-    }
-
-    pub fn repl(buf: &mut String) -> Result<(), Box<dyn Error>> {
-        let mut line = String::new();
-        let mut linenr = 1;
-        println!(
-            "{}",
-            color!(DarkGray, "{} v{}", env!("CARGO_BIN_NAME"), env!("CARGO_PKG_VERSION"))
-        );
-        printfl!("{}", linenr!(linenr));
-        while let Ok(len) = stdin().read_line(&mut line) {
-            match len {
-                0 => break,    // No newline (reached EOF)
-                1 => continue, // Line is empty
-                _ => (),
-            }
-            // Try to parse this line in isolation (this restricts preprocessing)
-            match Parser::new(&line).parse::<Statements>() {
-                Err(error) => errpp(&line, linenr, &error),
-                Ok(_) => {
-                    okpp(&line, linenr);
-                    *buf += &line;
-                    linenr += 1;
-                }
-            }
-            line.clear();
-            printfl!("{}", linenr!(linenr));
-        }
-        println!("{}", color!(Gray, "[EOF]"));
-        Ok(())
-    }
-
-    fn okpp(line: &str, linenr: i32) {
-        println!(
-            "{}{}{}",
-            move_cursor!(1, 5),
-            color!(Green, "{:4}", linenr!(linenr)),
-            line.trim_end(),
-        );
-    }
-
-    /// Pretty-prints a line error
-    fn errpp(line: &str, linenr: i32, err: &PError) {
-        let loc = err.loc;
-        if stderr().is_terminal() {
-            let line = line.trim_end();
-            eprint!("{}{}", MoveCursorToPreviousLine(1), color!(Red, "{}", linenr!(linenr)));
-            let (start, mid, end) = line.split_twice(loc.start, loc.end);
-            eprintln!("{start}{}{end} {}", color!(Red, "{}", mid), color!(DarkGray, "; {}", err));
-        } else {
-            eprintln!("{} ({err})", line.trim())
-        }
-    }
-}
-
 // Parses and assembles a buffer, then prints it in hex to stdout
 fn asm(buf: &str) -> Result<(), Box<dyn Error>> {
     match Parser::new(buf).parse::<Statements>()?.to_canonical().assemble() {
@@ -129,3 +42,80 @@ fn asm(buf: &str) -> Result<(), Box<dyn Error>> {
     }
     Ok(())
 }
+
+mod args {
+    use argp::FromArgs;
+    use std::path::PathBuf;
+
+    /// Assembles MSP430 assembly into 16-bit little-endian machine code.  \
+    /// If used interactively, syntax is checked on a per-line basis.
+    #[derive(Debug, FromArgs)]
+    pub struct Args {
+        /// File to load. If not provided, takes input from stdin.
+        #[argp(option, short = 'f')]
+        pub file: Option<PathBuf>,
+    }
+}
+
+mod repl {
+    //! The REPL reads a line, parses it, evaluates the line, and prints, in a loop
+    use super::*;
+    use msp430_asm::cursor::*;
+    use std::io::{stderr, Write};
+
+    /// Prints the line number
+    macro linenr($n: expr) {
+        format_args!("{:4}: ", $n)
+    }
+
+    /// [println], but without the newline
+    macro printfl ($($x: expr),+) {
+        {print!($($x),+); let _ = ::std::io::stdout().flush();}
+    }
+
+    /// Runs the read-evaluate-print loop
+    pub fn repl(buf: &mut String) -> Result<(), Box<dyn Error>> {
+        let mut line = String::new();
+        let mut linenr = 1;
+        println!("{}", fg!(DarkGray, "{} v{}", env!("CARGO_BIN_NAME"), env!("CARGO_PKG_VERSION")));
+        printfl!("{}", linenr!(linenr));
+        while let Ok(len) = stdin().read_line(&mut line) {
+            match len {
+                0 => break,    // No newline (reached EOF)
+                1 => continue, // Line is empty
+                _ => (),
+            }
+            // Try to parse this line in isolation (this restricts preprocessing)
+            match Parser::new(&line).parse::<Statements>() {
+                Err(error) => format_err(&line, linenr, &error),
+                Ok(_) => {
+                    format_ok(&line, linenr);
+                    *buf += &line;
+                    linenr += 1;
+                }
+            }
+            line.clear();
+            printfl!("{}", linenr!(linenr));
+        }
+        println!("{}", fg!(Gray, "[EOF]"));
+        Ok(())
+    }
+
+    /// Rewrites the line in OK format, with a green linenr
+    fn format_ok(line: &str, linenr: i32) {
+        println!("{}{}{}", previous!(1), fg!(Green, "{:4}", linenr!(linenr)), line.trim_end(),);
+    }
+
+    /// Pretty-prints a line error
+    fn format_err(line: &str, linenr: i32, err: &PError) {
+        let loc = err.loc;
+        if stderr().is_terminal() {
+            let line = line.trim_end();
+            eprint!("{}{}", previous!(1), fg!(Red, "{}", linenr!(linenr)));
+            let (start, mid, end) = line.split_twice(loc.start, loc.end);
+            eprintln!("{start}{}{end} {}", fg!(Red, "{}", mid), fg!(DarkGray, "; {}", err));
+        } else {
+            eprintln!("{} ({err})", line.trim())
+        }
+    }
+}