chore: format a bit and add just fmt

flake.nix

@@ -38,6 +38,7 @@
 
                   packages = with pkgs; [
                     just nushell
+                    ripgrep
                     typst typst-lsp
                     mold
                     cargo-nextest cargo-watch

justfile

@@ -1,5 +1,9 @@
 all: test docs
 
+test:
+  #!/usr/bin/env nu
+  cargo nextest run
+
 # Compile all documentation as in proposals and design documents, placing them under `docs/compiled`.
 docs:
   #!/usr/bin/env nu
@@ -12,6 +16,8 @@ docs:
     mv $pdf docs/compiled
   } | ignore
 
-test:
+fmt:
   #!/usr/bin/env nu
-  cargo nextest run
+  cargo fmt
+  echo "Places where whitespace is at the end of a line:"
+  rg '\s$'

testfiles/bare.ron

@@ -1,12 +1,12 @@
 (
 	[
 		Read((
-			source: File("/home/jade/example/file.png"), 
-			format: Png
+			source: File("testfiles/juan.png"),
+			format: Jpeg
 		)),
 		Write(( 
-			target: File("/home/jade/example/out.jpg"), 
-			format: Jpeg
+			target: File("testfiles/out.png"),
+			format: Png
 		))
 	]
 )

testfiles/invert.ron

@@ -2,7 +2,7 @@
 	[
 		Read((
 			source: File("testfiles/juan.jpg"),
-			format: Png
+			format: Jpeg
 		)),
 		Filter(Invert),
 		Write((