globals: Add pipe, find-index and unwrap-nil

src/globals.apfl

@@ -205,7 +205,7 @@
         if result { result } { orelse ~fs }
     }
 
-    find-first := { l f ->
+    ifind-first := { f l ->
         out := nil
         i := 0
         n := len l
@@ -214,7 +214,7 @@
             Some:x ->
                 out = Some::x
             nil ->
-            } (f l@i)
+            } (f i l@i)
 
             i = ++ i
         }
@@ -222,12 +222,36 @@
         out
     }
 
+    find-first := { f l ->
+        ifind-first { _ x -> f x } l
+    }
+
+    find-index := { pred l ->
+        ifind-first { i x ->
+            if (pred x) { Some::i } { nil }
+        }
+    }
+
     unwrap-some := {
     Some:x then _ -> then x
     x _ else -> else x
     x then -> unwrap-some x then identity
     }
 
+    unwrap-nil := {
+    nil _ else -> (else)
+    x then _ -> then x
+    x then -> unwrap-nil x then {nil}
+    }
+
+    pipe := {
+    val -> val
+    val [f ~args] ~fs ->
+        pipe (f ~args val) ~fs
+    val f ~fs ->
+        pipe (f val) ~fs
+    }
+
     has-key := { k container ->
         {
             Some: _ -> true
@@ -235,6 +259,13 @@
         } (get-optional k container)
     }
 
+    get-or-default := { k container default ->
+        {
+            Some:x -> x
+            nil -> def
+        } (get-optional k container)
+    }
+
     run-file := { f ->
         ((load-file f))
     }
@@ -273,11 +304,11 @@
         }
 
         import := { name ->
-            maybe-mod := find-first searchers { s ->
+            maybe-mod := find-first { s ->
                 unwrap-some (s name) { loader ->
                     loader name
                 }
-            }
+            } searchers
 
             {
                 Some:mod ->
@@ -310,6 +341,12 @@
         [(f x) ~(map f xs)]
     }
 
+    foldl := {
+    f [x ~xs] -> foldl f x xs
+    _ carry [] -> carry
+    f carry [x ~xs] -> foldl f (f x carry) xs
+    }
+
     splice := {
     a off -> splice a off nil
     a off len -> splice a off len []
@@ -386,10 +423,14 @@
         'andalso -> andalso
         'orelse -> orelse
         'find-first -> find-first
+        'find-index -> find-index
         'unwrap-some -> unwrap-some
+        'unwrap-nil -> unwrap-nil
         'import -> modules.import
         'map -> map
         'splice -> splice
         'slice -> slice
+        'pipe -> pipe
+        'foldl -> foldl
     ]
 }