logging: use level-based logger functions

Do not pass logger objects around anymore. Shuffle some messages to make
them consistent with the new logging API. Avoid using %v when a more
specific verb exists for the argument types.

The loggers are completely disabled (i.e. Sprintf is not even called)
by default. They are only enabled when redirecting stdout to a file.

Signed-off-by: Robin Jarry <robin@jarry.cc>
Acked-by: Moritz Poldrack <moritz@poldrack.dev>

config/triggers.go

@@ -7,6 +7,7 @@ import (
 	"github.com/google/shlex"
 
 	"git.sr.ht/~rjarry/aerc/lib/format"
+	"git.sr.ht/~rjarry/aerc/logging"
 	"git.sr.ht/~rjarry/aerc/models"
 )
 
@@ -52,6 +53,6 @@ func (trig *TriggersConfig) ExecNewEmail(account *AccountConfig,
 			return fmt.Sprintf(formatstr, args...), nil
 		})
 	if err != nil {
-		fmt.Printf("Error from the new-email trigger: %s\n", err)
+		logging.Errorf("failed to run new-email trigger: %v", err)
 	}
 }