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