From 5807b5dc09e5532532753ba2bb48f014d20ad5a0 Mon Sep 17 00:00:00 2001
From: Christian Mollekopf <chrigi_1@fastmail.fm>
Date: Thu, 13 Aug 2015 22:01:31 +0200
Subject: A way to set the debuglevel.

Unittests can set the level themselves (so i.e. benchmarks don't print
a shitload of messages), while in normal operation we can set it from
the environment. There's no override currently, but first things first.
---
 common/log.cpp            | 43 +++++++++++++++++++++++++++++++++++++++++--
 common/log.h              | 16 ++++++++++++----
 common/resourceaccess.cpp |  4 ++--
 3 files changed, 55 insertions(+), 8 deletions(-)

diff --git a/common/log.cpp b/common/log.cpp
index 95a9c01..1fe09be 100644
--- a/common/log.cpp
+++ b/common/log.cpp
@@ -6,6 +6,8 @@
 #include <iostream>
 #include <unistd.h>
 
+using namespace Akonadi2::Log;
+
 class DebugStream: public QIODevice
 {
 public:
@@ -94,9 +96,46 @@ static QString colorCommand(QList<int> colorCodes)
     return string;
 }
 
-QDebug debugStream(DebugLevel debugLevel, int line, const char* file, const char* function, const char* debugArea)
+QByteArray debugLevelName(DebugLevel debugLevel)
+{
+    switch (debugLevel) {
+        case DebugLevel::Trace:
+            return "Trace";
+        case DebugLevel::Log:
+            return "Log";
+        case DebugLevel::Warning:
+            return "Warning";
+        case DebugLevel::Error:
+            return "Error";
+        default:
+            break;
+    };
+    Q_ASSERT(false);
+    return QByteArray();
+}
+
+DebugLevel debugLevelFromName(const QByteArray &name)
+{
+    if (name.toLower() == "trace")
+        return DebugLevel::Trace;
+    if (name.toLower() == "log")
+        return DebugLevel::Log;
+    if (name.toLower() == "warning")
+        return DebugLevel::Warning;
+    if (name.toLower() == "error")
+        return DebugLevel::Error;
+    return DebugLevel::Log;
+}
+
+void Akonadi2::Log::setDebugOutputLevel(DebugLevel debugLevel)
+{
+    qputenv("AKONADI2DEBUGLEVEL", debugLevelName(debugLevel));
+}
+
+QDebug Akonadi2::Log::debugStream(DebugLevel debugLevel, int line, const char* file, const char* function, const char* debugArea)
 {
-    if (debugLevel <= DebugLevel::Trace) {
+    DebugLevel debugOutputLevel = debugLevelFromName(qgetenv("AKONADI2DEBUGLEVEL"));
+    if (debugLevel < debugOutputLevel) {
         static NullStream stream;
         return QDebug(&stream);
     }
diff --git a/common/log.h b/common/log.h
index ee92f46..9db9e8e 100644
--- a/common/log.h
+++ b/common/log.h
@@ -2,6 +2,9 @@
 
 #include <QDebug>
 
+namespace Akonadi2 {
+namespace Log {
+
 enum DebugLevel {
     Trace,
     Log,
@@ -9,10 +12,15 @@ enum DebugLevel {
     Error
 };
 
+void setDebugOutputLevel(DebugLevel);
+
 QDebug debugStream(DebugLevel debugLevel, int line, const char* file, const char* function, const char* debugArea = 0);
 
-#define Trace() debugStream(DebugLevel::Trace, __LINE__, __FILE__, Q_FUNC_INFO)
-#define Log() debugStream(DebugLevel::Log, __LINE__, __FILE__, Q_FUNC_INFO)
-#define Warning() debugStream(DebugLevel::Warning, __LINE__, __FILE__, Q_FUNC_INFO)
+}
+}
+
+#define Trace() Akonadi2::Log::debugStream(Akonadi2::Log::DebugLevel::Trace, __LINE__, __FILE__, Q_FUNC_INFO)
+#define Log() Akonadi2::Log::debugStream(Akonadi2::Log::DebugLevel::Log, __LINE__, __FILE__, Q_FUNC_INFO)
+#define Warning() Akonadi2::Log::debugStream(Akonadi2::Log::DebugLevel::Warning, __LINE__, __FILE__, Q_FUNC_INFO)
 //FIXME Error clashes with Storage::Error and MessageQueue::Error
-#define ErrorMsg() debugStream(DebugLevel::Error, __LINE__, __FILE__, Q_FUNC_INFO)
+#define ErrorMsg() Akonadi2::Log::debugStream(Akonadi2::Log::DebugLevel::Error, __LINE__, __FILE__, Q_FUNC_INFO)
diff --git a/common/resourceaccess.cpp b/common/resourceaccess.cpp
index ef4e64c..84bc4ea 100644
--- a/common/resourceaccess.cpp
+++ b/common/resourceaccess.cpp
@@ -38,9 +38,9 @@
 #include <QProcess>
 
 #undef Trace
-#define Trace() debugStream(DebugLevel::Trace, __LINE__, __FILE__, Q_FUNC_INFO, "ResourceAccess")
+#define Trace() Akonadi2::Log::debugStream(Akonadi2::Log::DebugLevel::Trace, __LINE__, __FILE__, Q_FUNC_INFO, "ResourceAccess")
 #undef Log
-#define Log(IDENTIFIER) debugStream(DebugLevel::Log, __LINE__, __FILE__, Q_FUNC_INFO, "ResourceAccess("+IDENTIFIER+")")
+#define Log(IDENTIFIER) Akonadi2::Log::debugStream(Akonadi2::Log::DebugLevel::Log, __LINE__, __FILE__, Q_FUNC_INFO, "ResourceAccess("+IDENTIFIER+")")
 
 namespace Akonadi2
 {
-- 
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