diff --git a/home/modules/color/applyColors.py b/home/modules/color/applyColors.py
index 7f8461ec..50954a54 100644
--- a/home/modules/color/applyColors.py
+++ b/home/modules/color/applyColors.py
@@ -1,16 +1,96 @@
 import fileinput
+import re
+from typing import Callable
 
-colors: dict[str, str]
+# This dict gets defined before.
+# The code is templated by nix to fill the color values automatically.
 # colors: dict[str, str] = {
 #     "rosewater": "f5e0dc",
 #     "flamingo": "f2cdcd",
 # }
+colors: dict[str, str]
 
 
-def applyColorToLine(line: str) -> None:
-    print(f"{line} # piped")
+def getRule(
+    line: str,
+    value: str,
+) -> Callable[[str, str, str], str] | None:
+    """Obtain a substitution rule for a line"""
+
+    # This contains each rule assigned to a pattern
+    rules: dict[str, Callable[[str, str, str], str]] = {
+        # "#ffffff" -> ${color.hexS.white}
+        f'"#{value}"': lambda line, name, value: line.replace(
+            f'"#{value}"', f"${{color.hexS.{name}}}"
+        ),
+        # '#ffffff' -> ${color.hexS.white}
+        f"'#{value}'": lambda line, name, value: line.replace(
+            f"'#{value}'", f"${{color.hexS.{name}}}"
+        ),
+        # #ffffff -> ${color.hexS.white}
+        f"#{value}": lambda line, name, value: line.replace(
+            f"#{value}", f"${{color.hexS.{name}}}"
+        ),
+        # "ffffff" -> ${color.hex.white}
+        f'"{value}"': lambda line, name, value: line.replace(
+            f'"{value}"', f"${{color.hex.{name}}}"
+        ),
+        # 'ffffff' -> ${color.hex.white}
+        f"'{value}'": lambda line, name, value: line.replace(
+            f"'{value}'", f"${{color.hex.{name}}}"
+        ),
+        # ffffff -> ${color.hex.white}
+        f"{value}": lambda line, name, value: line.replace(
+            f"{value}", f"${{color.hex.{name}}}"
+        ),
+        # "#${color.hex.white}" -> ${color.hexS.white}
+        '"#${color.hex."': lambda line, name, value: line.replace(
+            '"#${color.hex."', "${color.hexS.}"
+        ),
+        # ff,ff,ff -> ${color.rgbS.white}
+        f"{value[0:2]},{value[2:4]},{value[4:6]}": lambda line, name, value: line.replace(
+            f"{value[0:2]},{value[2:4]},{value[4:6]}", f"${{color.rgbS.{name}}}"
+        ),
+    }
+
+    for pattern, rule in rules.items():
+        # If the line matches the pattern, use this rule
+        if len(re.findall(pattern, line, re.IGNORECASE)) > 0:
+            return rule
+
+    return None
+
+
+def applyColorToLine(
+    line: str,
+    name: str,
+    value: str,
+) -> str:
+    """Apply a single color to a single line"""
+    result: str = line
+
+    rule: Callable[[str, str, str], str] | None = getRule(result, value)
+    while rule is not None:
+        result = rule(line, name, value)
+
+        # We apply rules until no rule can be applied anymore
+        rule = getRule(result, value)
+
+    return result
+
+
+def applyColorsToLine(
+    line: str,
+) -> None:
+    """Apply all defined colors to a single line"""
+    result: str = line
+    for name, value in colors.items():
+        result = applyColorToLine(result, name, value)
+
+    # Print to stdout
+    print(result)
 
 
 # Apply transformation to every line from stdin
 for line in fileinput.input():
-    applyColorToLine(line)
+    applyColorsToLine(line.rstrip())