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// CommandOutput.h
// Declares various classes that process command output
/** Interface for a callback that receives command output
The Out() function is called for any output the command has produced.
Descendants override that function to provide specific processing of the output.
*/
class cCommandOutputCallback
{
public:
virtual ~cCommandOutputCallback() {}; // Force a virtual destructor in subclasses
/// Syntax sugar function, calls Out() with Printf()-ed parameters; appends a "\n"
void Out(const char * a_Fmt, ...) FORMATSTRING(2, 3);
/// Called when the command wants to output anything; may be called multiple times
virtual void Out(const AString & a_Text) = 0;
/// Called when the command processing has been finished
virtual void Finished(void) {};
} ;
/// Class that discards all command output
class cNullCommandOutputCallback :
public cCommandOutputCallback
{
// cCommandOutputCallback overrides:
virtual void Out(const AString & a_Text) override
{
// Do nothing
UNUSED(a_Text);
}
} ;
/// Sends all command output to a log, line by line, when the command finishes processing
class cLogCommandOutputCallback :
public cCommandOutputCallback
{
public:
// cCommandOutputCallback overrides:
virtual void Out(const AString & a_Text) override;
virtual void Finished(void) override;
protected:
/// Output is stored here until the command finishes processing
AString m_Buffer;
} ;
/// Sends all command output to a log, line by line; deletes self when command finishes processing
class cLogCommandDeleteSelfOutputCallback :
public cLogCommandOutputCallback
{
typedef cLogCommandOutputCallback super;
virtual void Finished(void) override
{
super::Finished();
delete this;
}
} ;
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