[Lib/Debug] init with traceValWithPrefix and toPretty

Easier custom traces!

lib/debug.nix

@@ -0,0 +1,22 @@
+{ lib, myLib }:
+with lib;
+rec {
+  toPretty = depth: x:
+    # Stolen from: https://github.com/teto/nixpkgs/blob/6f098631f6f06b93c17f49abdf677790e017778d/lib/debug.nix#L109C5-L117C30
+    let
+        snip = v: if      isList  v then noQuotes "[…]" v
+                  else if isAttrs v then noQuotes "{…}" v
+                  else v;
+        noQuotes = str: v: { __pretty = const str; val = v; };
+        modify = n: fn: v: if (n == 0) then fn v
+                      else if isList  v then map (modify (n - 1) fn) v
+                      else if isAttrs v then mapAttrs
+                        (const (modify (n - 1) fn)) v
+                      else v;
+    in lib.generators.toPretty { allowPrettyValues = true; } (modify depth snip x);
+      
+  traceValWithPrefix = prefix: value:
+    #trace "traceValWithPrefix 'prefix': ${prefix}" value
+    trace "${prefix}: ${toPretty 2 value}" value
+  ;
+}

lib/default.nix

@@ -11,5 +11,6 @@ let
     optimizations = callLibs ./optimizations.nix;
     attrsets = callLibs ./attrsets.nix;
     types = callLibs ./types.nix;
+    debug = callLibs ./debug.nix;
   });
 in myLib