Proper console mode for LibreOffice on Windows

LibreOffice has always supported usage of command line switches that allow operations like conversion of documents to different file types, or batch-printing. Using LibreOffice CLI in various scripts is a very common scenario.

But until now, it had somewhat suboptimal support for this on Windows. The main executable module – soffice.bin – being a GUI subsystem application, it could not properly output its messages to the calling console, as well as return error codes to check ERRORLEVEL for success. The hacks used to redirect the output of the GUI application to the calling console were unreliable and didn’t work at all on some supported versions of Windows. Sometimes one could not even see why the entered command line was rejected as invalid.

I have just pushed a commit that changes the situation. Now LibreOffice has proper console mode on Windows. soffice.bin is now built for console subsystem, which allows using it in abovementioned scenarios, having the stdout and stderr output, as well as return code, properly sent to console (or redirected using normal means); in debug builds, the debug output is also visible on the console. To allow comfortable usage, a new console launcher executable is introduced, soffice.com, in LibreOffice installation’s program/ folder, alongside with familiar soffice.exe, which is retained for all GUI uses, as before. This allows to continue using command lines like
"c:\Program Files\LibreOffice\program\soffice" --convert-to odt file.doc
from cmd.exe command-line interpreter, without specifying the executable extension, and have the soffice.com launched to have proper console operation (subject to value of PATHEXT environment variable). The command properly “owns” the console (does not return to command prompt) until soffice finishes.

The change will be available in LibreOffice 6.3 scheduled for Summer 2019 (if testing does not reveal a major problem which would require to revert this). I hope this will make use of LibreOffice CLI more comfortable for Windows users, on par with other platforms. If you find any problems with the solution, please report bugs to our bug tracker. Early testing using daily builds is much appreciated!

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