CmdX: Added error message when expected ids are missing

src/commands/CmdJoin.cpp

@@ -87,7 +87,7 @@ int CmdJoin (
     }
   }
   else
-    std::cout << "Provide two interval IDs to join them.\n";
+    throw std::string ("Two IDs must be specified. See 'timew help join'.");
 
   return 0;
 }

src/commands/CmdLengthen.cpp

@@ -50,6 +50,9 @@ int CmdLengthen (
       delta = arg.attribute ("raw");
   }
 
+  if (! ids.size ())
+    throw std::string ("IDs must be specified. See 'timew help lengthen'.");
+
   // TODO Support :adjust
 
   // Load the data.

src/commands/CmdMove.cpp

@@ -55,6 +55,9 @@ int CmdMove (
       new_start = arg.attribute ("raw");
   }
 
+  if (! id)
+    throw std::string ("ID must be specified. See 'timew help move'.");
+
   // TODO Support :adjust
 
   // Load the data.

src/commands/CmdShorten.cpp

@@ -50,6 +50,9 @@ int CmdShorten (
       delta = arg.attribute ("raw");
   }
 
+  if (! ids.size ())
+    throw std::string ("IDs must be specified. See 'timew help shorten'.");
+
   // TODO Support :adjust
 
   // Load the data.

src/commands/CmdSplit.cpp

@@ -50,6 +50,9 @@ int CmdSplit (
       delta = arg.attribute ("raw");
   }
 
+  if (! ids.size ())
+    throw std::string ("IDs must be specified. See 'timew help split'.");
+
   // TODO Support :adjust
 
   // Load the data.

src/commands/CmdTag.cpp

@@ -48,6 +48,9 @@ int CmdTag (
       tags.push_back (arg.attribute ("raw"));
   }
 
+  if (! ids.size ())
+    throw std::string ("IDs must be specified. See 'timew help tag'.");
+
   // Load the data.
   // Note: There is no filter.
   Interval filter;

src/commands/CmdUntag.cpp

@@ -48,6 +48,9 @@ int CmdUntag (
       tags.push_back (arg.attribute ("raw"));
   }
 
+  if (! ids.size ())
+    throw std::string ("IDs must be specified. See 'timew help untag'.");
+
   // Load the data.
   // Note: There is no filter.
   Interval filter;