CmdCustom: Respect report.<name>.context configuration variable

This allows the user to configure if a specific report should (or should
not) adhere to the currently active context.

Closes #2560.

src/commands/CmdCustom.cpp

@@ -59,6 +59,21 @@ CmdCustom::CmdCustom (
   _category              = Category::report;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// Whether a report uses context is defined by the report.<name>.context
+// configuration variable.
+//
+bool CmdCustom::uses_context () const
+{
+  auto config = Context::getContext ().config;
+  auto key = "report." + _keyword + ".context";
+
+  if (config.has (key))
+    return config.getBoolean (key);
+  else
+    return _uses_context;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 int CmdCustom::execute (std::string& output)
 {

src/commands/CmdCustom.h

@@ -34,6 +34,7 @@ class CmdCustom : public Command
 {
 public:
   CmdCustom (const std::string&, const std::string&, const std::string&);
+  bool uses_context () const override;
   int execute (std::string&);
 
 private:

src/commands/Command.h

@@ -63,7 +63,7 @@ public:
   bool read_only () const;
   bool displays_id () const;
   bool needs_gc () const;
-  bool uses_context () const;
+  virtual bool uses_context () const;
   bool accepts_filter () const;
   bool accepts_modifications () const;
   bool accepts_miscellaneous () const;