Add logs function to Matrix

Merge pull request #27 from noordstar/4-log-reader

src/Matrix.elm

@@ -1,6 +1,6 @@
 module Matrix exposing
     ( Vault, fromUserId, fromUsername
-    , VaultUpdate, update
+    , VaultUpdate, update, logs
     , addAccessToken, sendMessageEvent
     )
 
@@ -24,7 +24,7 @@ support a monolithic public registry. (:
 
 ## Keeping the Vault up-to-date
 
-@docs VaultUpdate, update
+@docs VaultUpdate, update, logs
 
 
 ## Debugging
@@ -112,6 +112,28 @@ fromUsername { username, host, port_ } =
         |> Vault
 
 
+{-| The VaultUpdate is a complex type that helps update the Vault. However,
+it also contains a human output!
+
+Using this function, you can get a human output that describes everything that
+the VaultUpdate has to tell the Vault.
+
+The `channel` field describes the context of the log, allowing you to filter
+further. For example:
+
+  - `debug` is a comprehensive channel describing everything the Elm runtime has
+    executed.
+  - `warn` contains warnings that aren't breaking, but relevant.
+  - `securityWarn` warns about potential security issues or potential attacks.
+  - `error` has errors that were encountered.
+  - `caughtError` has errors that were dealt with successfully.
+
+-}
+logs : VaultUpdate -> List { channel : String, content : String }
+logs (VaultUpdate vu) =
+    vu.logs
+
+
 {-| Send a message event to a room.
 
 This function can be used in a scenario where the user does not want to sync
@@ -119,6 +141,18 @@ the client, or is unable to. This function doesn't check whether the given room
 exists and the user is able to send a message to, and instead just sends the
 request to the Matrix API.
 
+The fields stand for the following:
+
+  - `content` is the JSON object that is sent to the Matrix room.
+  - `eventType` is the event type that is sent to the Matrix room.
+  - `roomId` is the Matrix room ID.
+  - `toMsg` is the `msg` type that is returned after the message has been sent.
+  - `transactionId` is a unique identifier that helps the Matrix server
+    distringuish messages. If you send the same message with the same transactionId,
+    the server promises to register it only once.
+  - `vault` is the Matrix Vault that contains all the latest and most relevant
+    information.
+
 -}
 sendMessageEvent :
     { content : E.Value