Add fkmap and vectorize macro

src/rss_thread_watch/utils.clj

@@ -47,6 +47,11 @@
        ~x
        result#)))
 
+(defmacro vectorize
+  "If arg is not a vector, put into vector, otherwise return it"
+  [v]
+  (if (vector? v) v [v]))
+
 ;; ===== Generic functions ====
 
 (defn indices
@@ -71,13 +76,25 @@
 
 (defn fmap
   "Applies function [f] to every key and value in map [m]
-   Function signature should be (f [key value])."
+   Function signature should be (f [key value]).
+   Key stays unchanged"
   [f m]
   (into
    (empty m)
    (for [[key val] m]
      [key (f key val)])))
 
+(defn fkmap
+  ;; I am horrible with docstrings, I don't deny that
+  "Applies function [f] to every key and value in map [m]
+   Function signature should be (f [key value]).
+   Unlike fmap, you can change key too, so return both {key value} in map"
+  [f m]
+  (into
+   (empty m)
+   (for [[key val] m]
+     (f key val))))
+
 (defn expand-home
   "Expands ~ to home directory"
   ;;modified from sauce: https://stackoverflow.com/questions/29585928/how-to-substitute-path-to-home-for