diff --git a/src/Hooks.cpp b/src/Hooks.cpp
index 61cfccffc..ed097a919 100644
--- a/src/Hooks.cpp
+++ b/src/Hooks.cpp
@@ -45,13 +45,6 @@
 
 extern Context context;
 
-////////////////////////////////////////////////////////////////////////////////
-Hooks::Hooks ()
-: _enabled (true)
-, _debug (0)
-{
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 void Hooks::initialize ()
 {
@@ -111,7 +104,7 @@ bool Hooks::enable (bool value)
 // - all emitted non-JSON lines are considered feedback or error messages
 //   depending on the status code.
 //
-void Hooks::onLaunch ()
+void Hooks::onLaunch () const
 {
   if (! _enabled)
     return;
@@ -164,7 +157,7 @@ void Hooks::onLaunch ()
 // - all emitted non-JSON lines are considered feedback or error messages
 //   depending on the status code.
 //
-void Hooks::onExit ()
+void Hooks::onExit () const
 {
   if (! _enabled)
     return;
@@ -226,7 +219,7 @@ void Hooks::onExit ()
 // - all emitted non-JSON lines are considered feedback or error messages
 //   depending on the status code.
 //
-void Hooks::onAdd (Task& task)
+void Hooks::onAdd (Task& task) const
 {
   if (! _enabled)
     return;
@@ -292,7 +285,7 @@ void Hooks::onAdd (Task& task)
 // - all emitted non-JSON lines are considered feedback or error messages
 //   depending on the status code.
 //
-void Hooks::onModify (const Task& before, Task& after)
+void Hooks::onModify (const Task& before, Task& after) const
 {
   if (! _enabled)
     return;
@@ -346,16 +339,16 @@ void Hooks::onModify (const Task& before, Task& after)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-std::vector <std::string> Hooks::list ()
+std::vector <std::string> Hooks::list () const
 {
   return _scripts;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-std::vector <std::string> Hooks::scripts (const std::string& event)
+std::vector <std::string> Hooks::scripts (const std::string& event) const
 {
   std::vector <std::string> matching;
-  for (auto& i : _scripts)
+  for (const auto& i : _scripts)
   {
     if (i.find ("/" + event) != std::string::npos)
     {
@@ -500,7 +493,7 @@ void Hooks::assertFeedback (const std::vector <std::string>& input) const
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-std::vector <std::string>& Hooks::buildHookScriptArgs (std::vector <std::string>& args)
+std::vector <std::string>& Hooks::buildHookScriptArgs (std::vector <std::string>& args) const
 {
   Variant v;
 
@@ -530,7 +523,7 @@ std::vector <std::string>& Hooks::buildHookScriptArgs (std::vector <std::string>
 int Hooks::callHookScript (
   const std::string& script,
   const std::vector <std::string>& input,
-  std::vector <std::string>& output)
+  std::vector <std::string>& output) const
 {
   if (_debug >= 1)
     context.debug ("Hook: Calling " + script);
@@ -538,12 +531,12 @@ int Hooks::callHookScript (
   if (_debug >= 2)
   {
     context.debug ("Hook: input");
-    for (auto& i : input)
+    for (const auto& i : input)
       context.debug ("  " + i);
   }
 
   std::string inputStr;
-  for (auto& i : input)
+  for (const auto& i : input)
     inputStr += i + "\n";
 
   std::vector <std::string> args;
@@ -551,7 +544,7 @@ int Hooks::callHookScript (
   if (_debug >= 2)
   {
     context.debug ("Hooks: args");
-    for (auto& arg: args)
+    for (const auto& arg: args)
       context.debug ("  " + arg);
   }
 
@@ -573,7 +566,7 @@ int Hooks::callHookScript (
   if (_debug >= 2)
   {
     context.debug ("Hook: output");
-    for (auto& i : output)
+    for (const auto& i : output)
       if (i != "")
         context.debug ("  " + i);
 
diff --git a/src/Hooks.h b/src/Hooks.h
index 969e89272..2c76e292e 100644
--- a/src/Hooks.h
+++ b/src/Hooks.h
@@ -34,36 +34,30 @@
 class Hooks
 {
 public:
-  Hooks ();
-  Hooks (const Hooks&) = delete;
-  Hooks& operator= (const Hooks&) = delete;
-
+  Hooks () = default;
   void initialize ();
   bool enable (bool);
-
-  void onLaunch ();
-  void onExit ();
-  void onAdd (Task&);
-  void onModify (const Task&, Task&);
-
-  std::vector <std::string> list ();
+  void onLaunch () const;
+  void onExit () const;
+  void onAdd (Task&) const;
+  void onModify (const Task&, Task&) const;
+  std::vector <std::string> list () const;
 
 private:
-  std::vector <std::string> scripts (const std::string&);
+  std::vector <std::string> scripts (const std::string&) const;
   void separateOutput (const std::vector <std::string>&, std::vector <std::string>&, std::vector <std::string>&) const;
   bool isJSON (const std::string&) const;
   void assertValidJSON (const std::vector <std::string>&) const;
   void assertNTasks (const std::vector <std::string>&, unsigned int) const;
   void assertSameTask (const std::vector <std::string>&, const Task&) const;
   void assertFeedback (const std::vector <std::string>&) const;
-  std::vector <std::string>& buildHookScriptArgs (std::vector <std::string>&);
-  int callHookScript (const std::string&, const std::vector <std::string>&, std::vector <std::string>&);
+  std::vector <std::string>& buildHookScriptArgs (std::vector <std::string>&) const;
+  int callHookScript (const std::string&, const std::vector <std::string>&, std::vector <std::string>&) const;
 
 private:
-  bool                      _enabled;
-  int                       _debug;
-  std::vector <std::string> _scripts;
+  bool                      _enabled {true};
+  int                       _debug   {0};
+  std::vector <std::string> _scripts {};
 };
 
 #endif
-////////////////////////////////////////////////////////////////////////////////