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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 newline" */
void Out(const char * a_Fmt, fmt::ArgList);
FMT_VARIADIC(void, Out, const char *)
/** 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);
}
} ;
/** Accumulates all command output into a string. */
class cStringAccumCommandOutputCallback:
public cCommandOutputCallback
{
typedef cCommandOutputCallback super;
public:
// cCommandOutputCallback overrides:
virtual void Out(const AString & a_Text) override;
virtual void Finished(void) override {}
/** Returns the accumulated command output in a string. */
const AString & GetAccum(void) const { return m_Accum; }
protected:
/** Output is stored here until the command finishes processing */
AString m_Accum;
} ;
/** Sends all command output to a log, line by line, when the command finishes processing */
class cLogCommandOutputCallback :
public cStringAccumCommandOutputCallback
{
public:
// cStringAccumCommandOutputCallback overrides:
virtual void Finished(void) override;
} ;
/** 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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