meta: add lib and refactor

1/advanced.nix

@@ -1,14 +1,7 @@
-with import <nixpkgs/lib>;
+with import ../lib;
 
 let
   input = fileContents ./input.txt;
-  
-  splitStr = pattern: flip pipe [
-    (strings.split pattern)
-    (filter isString)
-  ];
-  
-  sum = foldl' add 0;
 in
 
 pipe input [

1/basic.nix

@@ -1,12 +1,7 @@
-with import <nixpkgs/lib>;
+with import ../lib;
 
 let
   input = fileContents ./input.txt;
-  
-  splitStr = pattern: flip pipe [
-    (strings.split pattern)
-    (filter isString)
-  ];
 in
 
 pipe input [
@@ -14,7 +9,7 @@ pipe input [
   (map (flip pipe [
     (splitStr "\n")
     (map toInt)
-    (foldl' add 0)
+    sum
   ]))
   (foldl' max 0)
 ]

2/advanced.nix

@@ -1,13 +1,8 @@
-with import <nixpkgs/lib>;
+with import ../lib;
 
 let
   input = fileContents ./input.txt;
 
-  splitStr = pattern: flip pipe [
-    (strings.split pattern)
-    (filter isString)
-  ];
-
   score = myAction: opponentShape: {
     X.A = 0 + 3;
     X.B = 0 + 1;
@@ -28,5 +23,5 @@ pipe input [
     elemAt
     (get: score (get 1) (get 0))
   ]))
-  (foldl' add 0)
+  sum
 ]

2/basic.nix

@@ -1,13 +1,8 @@
-with import <nixpkgs/lib>;
+with import ../lib;
 
 let
   input = fileContents ./input.txt;
 
-  splitStr = pattern: flip pipe [
-    (strings.split pattern)
-    (filter isString)
-  ];
-
   score = myShape: opponentShape: {
     X.A = 3 + 1;
     X.B = 0 + 1;
@@ -28,5 +23,5 @@ pipe input [
     elemAt
     (get: score (get 1) (get 0))
   ]))
-  (foldl' add 0)
+  sum
 ]

lib/default.nix

@@ -0,0 +1,12 @@
+let
+  nixpkgsLib = import <nixpkgs/lib>;
+
+  aocLib = with nixpkgsLib; {
+    splitStr = pattern: flip pipe [
+      (strings.split pattern)
+      (filter isString)
+    ];
+
+    sum = foldl' add 0;
+  };
+in nixpkgsLib // aocLib