Starts a good tracing interface

src/prover/constraints.rs

@@ -5,6 +5,7 @@ use litemap::LiteMap;
 use crate::ast::Body;
 use crate::ast::Predicate;
 use crate::ast::Variable;
+use crate::prover::tracing::colored_var;
 
 #[derive(Clone, Debug)]
 pub struct Constraints
@@ -187,7 +188,7 @@ impl Display for Constraints
         let len = self.set.len();
         for (i, (var, pred)) in self.set.iter().enumerate()
         {
-            write!(f, "{} = {}", var, pred)?;
+            write!(f, "{} = {}", colored_var(var), pred)?;
             if i != len - 1
             {
                 write!(f, ", ")?;

src/prover/tracing.rs

@@ -1,6 +1,9 @@
 use std::{default, fmt::Display};
 
 use log::info;
+use owo_colors::{OwoColorize, colors::css::Gray};
+
+use crate::ast::Variable;
 
 #[derive(Clone, Copy)]
 pub enum ProofType
@@ -61,3 +64,18 @@ impl Tracer for SimpleTracer
         todo!()
     }
 }
+
+pub fn colored_var(var: &Variable) -> String
+{
+    let mut idx = None;
+    for (i, char) in var.chars().enumerate()
+    {
+        if char == '['
+        {
+            idx = Some(i);
+        }
+    }
+    let (var, unique) = var.split_at(idx.unwrap_or(var.len()));
+    let unique = unique.fg::<Gray>();
+    format!("{}{}", var, unique)
+}