From 6f80d2d579d0be8773829ee277086af087e85862 Mon Sep 17 00:00:00 2001
From: Paul Oliver <contact@pauloliver.dev>
Date: Mon, 25 Aug 2025 02:35:34 +0000
Subject: Improves formatting of logs

---
 hsm-log/Hsm/Log.hs | 44 ++++++++++++++++++++++++++++++++------------
 1 file changed, 32 insertions(+), 12 deletions(-)

(limited to 'hsm-log/Hsm')

diff --git a/hsm-log/Hsm/Log.hs b/hsm-log/Hsm/Log.hs
index 3c25501..a1ffdb4 100644
--- a/hsm-log/Hsm/Log.hs
+++ b/hsm-log/Hsm/Log.hs
@@ -5,27 +5,29 @@
 module Hsm.Log
   ( Severity(Attention, Info, Trace)
   , Log
-  , getLoggerIO
+  , makeLoggerIO
   , logMsg
+  , logBlock
   , runLog
   ) where
 
 import Control.Monad (when)
 import Data.Function (applyWhen)
+import Data.List (intercalate)
 import Data.Proxy (Proxy(Proxy))
 import Data.Time.Clock (getCurrentTime)
 import Data.Time.ISO8601 (formatISO8601Millis)
 import Effectful (Dispatch(Static), DispatchOf, Eff, Effect, IOE, (:>))
 import Effectful.Dispatch.Static (SideEffects(WithSideEffects), StaticRep, evalStaticRep, getStaticRep, unsafeEff_)
+import GHC.Conc.Sync (fromThreadId, myThreadId)
 import GHC.TypeLits (KnownSymbol, Symbol, symbolVal)
-import GHC.TypeLits.Printf (printf)
-import String.ANSI (red)
+import String.ANSI (blue, green, red, white)
 
 data Severity
   = Attention
   | Info
   | Trace
-  deriving (Enum, Eq, Ord, Show)
+  deriving (Enum, Eq, Ord)
 
 data Log (d :: Symbol) (a :: * -> *) (b :: *)
 
@@ -34,22 +36,40 @@ type instance DispatchOf (Log d) = Static WithSideEffects
 newtype instance StaticRep (Log d) =
   Log Severity
 
-getLoggerIO ::
+makeLoggerIO ::
      forall d es. (KnownSymbol d, Log d :> es)
   => Eff es (Severity -> String -> IO ())
-getLoggerIO = do
-  Log level <- getStaticRep
-  return $ \severity message ->
-    when (severity <= level) $ do
-      time <- formatISO8601Millis <$> getCurrentTime
-      putStrLn . applyWhen (severity == Attention) red $ printf "%s %s [%s] %s" time (symbolVal $ Proxy @d) (show severity) message
+makeLoggerIO = getStaticRep >>= \(Log level) -> return $ loggerIO level
+  where
+    loggerIO level severity message =
+      when (severity <= level) $ do
+        time <- formatISO8601Millis <$> getCurrentTime
+        threadId <- show . fromThreadId <$> myThreadId
+        putStrLn $ unwords [time, fmtDomainAndThreadId threadId, fmtSeverity, fmtMessage]
+      where
+        fmtDomainAndThreadId threadId = white $ symbolVal (Proxy @d) <> ":" <> threadId
+        fmtSeverity =
+          case severity of
+            Attention -> red "ATTENTION"
+            Info -> green "INFO"
+            Trace -> blue "TRACE"
+        fmtMessage = applyWhen (severity == Attention) red message
 
 logMsg ::
      forall d es. (KnownSymbol d, Log d :> es)
   => Severity
   -> String
   -> Eff es ()
-logMsg severity message = getLoggerIO >>= \loggerIO -> unsafeEff_ $ loggerIO severity message
+logMsg severity message = makeLoggerIO >>= \loggerIO -> unsafeEff_ $ loggerIO severity message
+
+logBlock ::
+     forall d es. (KnownSymbol d, Log d :> es)
+  => Severity
+  -> String
+  -> Eff es ()
+logBlock severity message = logMsg severity $ separator <> intercalate separator (lines message)
+  where
+    separator = "\n ... "
 
 runLog ::
      forall d es a. IOE :> es
-- 
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