Add functionality to un/follow buttons

The router_utils savePref function didn't work in my
testing, so I am setting the cookie directly through
Jester's setCookie procedure.

Author: FIGBERT

src/routes/follow.nim

@@ -1,12 +1,40 @@
-import jester
-import asyncdispatch, strutils, options, router_utils
-import ".."/[prefs, types, utils, redis_cache]
+import jester, asyncdispatch, strutils, sequtils
+import router_utils
+import ../types
 
 export follow
 
+proc addUserToFollowing*(following, toAdd: string): string =
+  var updated = following.split(",")
+  if updated == @[""]:
+    return toAdd
+  else:
+    updated = concat(updated, @[toAdd])
+    result = updated.join(",")
+
+proc removeUserFromFollowing*(following, remove: string): string =
+  var updated = following.split(",")
+  if updated == @[""]:
+    return ""
+  else:
+    updated = filter(updated, proc(x: string): bool = x != remove)
+    result = updated.join(",")
+
 proc createFollowRouter*(cfg: Config) =
   router follow:
-    post "/follow":
+    post "/follow/@name":
+      let
+        following = cookiePrefs().following
+        toAdd = @"name"
+        updated = addUserToFollowing(following, toAdd)
+      setCookie("following", updated, daysForward(360),
+                httpOnly=true, secure=cfg.useHttps, path="/")
       redirect(refPath())
-    post "/unfollow":
+    post "/unfollow/@name":
+      let
+        following = cookiePrefs().following
+        remove = @"name"
+        updated = removeUserFromFollowing(following, remove)
+      setCookie("following", updated, daysForward(360),
+                httpOnly=true, secure=cfg.useHttps, path="/")
       redirect(refPath())

src/views/profile.nim

@@ -27,9 +27,9 @@ proc renderProfileCard*(profile: Profile; prefs: Prefs, path: string): VNode =
           linkUser(profile, class="profile-card-username")
         let following = isFollowing(profile.username, prefs.following)
         if not following:
-          buttonReferer "/follow", "Follow", path, "profile-card-follow-button"
+          buttonReferer "/follow/" & profile.username, "Follow", path, "profile-card-follow-button"
         else:
-          buttonReferer "/unfollow", "Unfollow", path, "profile-card-follow-button"
+          buttonReferer "/unfollow/" & profile.username, "Unfollow", path, "profile-card-follow-button"
 
     tdiv(class="profile-card-extra"):
       if profile.bio.len > 0: