Allow immediate output of spawned processes for all platforms.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@29668 a592a061-630c-0410-9148-cb99ea01b6c8

src/support/Makefile.am

@@ -12,7 +12,7 @@ BUILT_SOURCES = $(PCH_FILE)
 #########################  Qt stuff  #############################
 #
 
-MOCHEADER = SignalSlotPrivate.h
+MOCHEADER = SignalSlotPrivate.h Systemcall.h
 
 MOCEDFILES = $(MOCHEADER:%.h=moc_%.cpp)
 

src/support/Systemcall.cpp

@@ -33,6 +33,7 @@ namespace support {
 
 static void killProcess(QProcess * p)
 {
+	p->disconnect();
 	p->closeReadChannel(QProcess::StandardOutput);
 	p->closeReadChannel(QProcess::StandardError);
 	p->close();
@@ -83,7 +84,6 @@ string const parsecmd(string const & cmd, string & outfile)
 	}
 	outfile.erase();
 	return cmd;
-
 }
 
 } // namespace anon
@@ -94,18 +94,15 @@ int Systemcall::startscript(Starttype how, string const & what)
 	string outfile;
 	QString cmd = toqstr(parsecmd(what, outfile));
 	QProcess * process = new QProcess;
-
-	// Qt won't start the process if we redirect stdout/stderr in
-	// this way and they are not connected to a terminal (maybe
-	// because we were launched from some desktop GUI).
+	ConOut console(process);
 	if (!outfile.empty()) {
 		// Check whether we have to simply throw away the output.
 		if (outfile != os::nulldev())
 			process->setStandardOutputFile(toqstr(outfile));
 	} else if (os::is_terminal(os::STDOUT))
-		process->setStandardOutputFile(toqstr(os::stdoutdev()));
+		console.showout();
 	if (os::is_terminal(os::STDERR))
-		process->setStandardErrorFile(toqstr(os::stderrdev()));
+		console.showerr();
 
 	process->start(cmd);
 	if (!process->waitForStarted(3000)) {
@@ -115,8 +112,10 @@ int Systemcall::startscript(Starttype how, string const & what)
 		LYXERR0("status " << process->exitStatus());
 		return 10;
 	}
-	if (how == DontWait)
+	if (how == DontWait) {
+		// TODO delete process later
 		return 0;
+	}
 
 	if (!process->waitForFinished(180000)) {
 		LYXERR0("Qprocess " << cmd << " did not finished!");
@@ -147,6 +146,57 @@ int Systemcall::startscript(Starttype how, string const & what)
 	killProcess(process);
 	return exit_code;
 }
+
+
+ConOut::ConOut(QProcess * proc) : proc_(proc), outindex_(0), errindex_(0),
+				  showout_(false), showerr_(false)
+{
+	connect(proc, SIGNAL(readyReadStandardOutput()), SLOT(stdOut()));
+	connect(proc, SIGNAL(readyReadStandardError()), SLOT(stdErr()));
+}
+
+
+ConOut::~ConOut()
+{
+	cout.flush();
+	cerr.flush();
+}
+
+
+void ConOut::stdOut()
+{
+	if (showout_) {
+		char c;
+		proc_->setReadChannel(QProcess::StandardOutput);
+		while (proc_->getChar(&c)) {
+			outdata_[outindex_++] = c;
+			if (c == '\n' || outindex_ + 1 == bufsize_) {
+				outdata_[outindex_] = '\0';
+				outindex_ = 0;
+				cout << outdata_;
+			}
+		}
+	}
+}
+
+
+void ConOut::stdErr()
+{
+	if (showerr_) {
+		char c;
+		proc_->setReadChannel(QProcess::StandardError);
+		while (proc_->getChar(&c)) {
+			errdata_[errindex_++] = c;
+			if (c == '\n' || errindex_ + 1 == bufsize_) {
+				errdata_[errindex_] = '\0';
+				errindex_ = 0;
+				cerr << errdata_;
+			}
+		}
+	}
+}
+
+#include "moc_Systemcall.cpp"
 #endif
 
 } // namespace support

src/support/Systemcall.h

@@ -16,6 +16,9 @@
 #define SYSTEMCALL_H
 
 #include <string>
+#include <QObject>
+
+class QProcess;
 
 namespace lyx {
 namespace support {
@@ -45,6 +48,48 @@ public:
 	int startscript(Starttype how, std::string const & what);
 };
 
+
+/**
+ * Outputs to the console terminal the line buffered standard output and
+ * error of a spawned process when there is a controlling terminal and 
+ * stdout/stderr have not been redirected.
+ */
+class ConOut : public QObject
+{
+	Q_OBJECT
+public:
+	ConOut(QProcess * proc);
+	~ConOut();
+
+	/// Should the standard output be displayed?
+	void showout() { showout_ = true; }
+
+	/// Should the standard error be displayed?
+	void showerr() { showerr_ = true; }
+
+private:
+	/// Pointer to the process to monitor.
+	QProcess * proc_;
+	/// Index to the standard output buffer.
+	size_t outindex_;
+	/// Index to the standard error buffer.
+	size_t errindex_;
+	/// Size of buffers.
+	static size_t const bufsize_ = 200;
+	/// Standard output buffer.
+	char outdata_[bufsize_];
+	/// Standard error buffer.
+	char errdata_[bufsize_];
+	/// 
+	bool showout_;
+	/// 
+	bool showerr_;
+
+public Q_SLOTS:
+	void stdOut();
+	void stdErr();
+};
+
 } // namespace support
 } // namespace lyx
 

src/support/os.h

@@ -39,12 +39,6 @@ void init(int argc, char * argv[]);
 /// Returns the name of the NULL device (/dev/null, null).
 std::string const & nulldev();
 
-/// Returns the name of the stdout device (/dev/stdout, /dev/tty, conout$).
-std::string const & stdoutdev();
-
-/// Returns the name of the stderr device (/dev/stderr, /dev/tty, conout$).
-std::string const & stderrdev();
-
 /// Tells whether \p channel is connected to a terminal or not. 
 bool is_terminal(io_channel channel);
 

src/support/os_cygwin.cpp

@@ -240,20 +240,6 @@ string const & nulldev()
 }
 
 
-string const & stdoutdev()
-{
-	static string const stdoutdev_ = "/dev/stdout";
-	return stdoutdev_;
-}
-
-
-string const & stderrdev()
-{
-	static string const stderrdev_ = "/dev/stderr";
-	return stderrdev_;
-}
-
-
 bool is_terminal(io_channel channel)
 {
 	return isatty(channel);

src/support/os_unix.cpp

@@ -30,23 +30,8 @@ namespace lyx {
 namespace support {
 namespace os {
 
-namespace {
-
-string stdoutdev_ = "/dev/stdout";
-string stderrdev_ = "/dev/stderr";
-
-} // namespace anon
-
 void init(int, char *[])
-{
-	// Check whether /dev/stdout and /dev/stderr are available,
-	// otherwise default to /dev/tty.
-	if (access(stdoutdev_.c_str(), W_OK) != 0
-	    || access(stderrdev_.c_str(), W_OK) != 0) {
-		stdoutdev_ = "/dev/tty";
-		stderrdev_ = "/dev/tty";
-	}
-}
+{}
 
 
 string current_root()
@@ -145,18 +130,6 @@ string const & nulldev()
 }
 
 
-string const & stdoutdev()
-{
-	return stdoutdev_;
-}
-
-
-string const & stderrdev()
-{
-	return stderrdev_;
-}
-
-
 bool is_terminal(io_channel channel)
 {
 	return isatty(channel);

src/support/os_win32.cpp

@@ -296,28 +296,23 @@ string const & nulldev()
 }
 
 
-string const & stdoutdev()
-{
-	static string const stdoutdev_ = "conout$";
-	return stdoutdev_;
-}
-
-
-string const & stderrdev()
-{
-	static string const stderrdev_ = "conout$";
-	return stderrdev_;
-}
-
-
 bool is_terminal(io_channel channel)
 {
-	// FIXME: Passing conout$ to Qt fails, most probably for the
-	// reason explained here:
-	// http://support.microsoft.com/?scid=kb%3Ben-us%3B90088&x=15&y=15
-	// How to convince Qt to open conout$ in FILE_SHARE_WRITE mode?
-	// For the time being, we assume we are not running in a terminal.
-	return false;
+	switch (channel) {
+	case STDIN:
+		if (GetStdHandle(STD_INPUT_HANDLE) == NULL)
+			return false;
+		break;
+	case STDOUT:
+		if (GetStdHandle(STD_OUTPUT_HANDLE) == NULL)
+			return false;
+		break;
+	case STDERR:
+		if (GetStdHandle(STD_ERROR_HANDLE) == NULL)
+			return false;
+		break;
+	}
+	return true;
 }