pyqgis - How to write log message in QGIS's script algorithms GUI tab?

I want to write some log in the log tab of processing algorithm User Interface.

I tried this :

from qgis.core import QgsMessageLog

QgsMessageLog.logMessage("test")

but when I launch the script "test" is not logged.

How to write a log in the processing User Interface ?

the processing guide log's chapter doesn't tell much about writing a log in this tab.

If i use :

from qgis.core import QgsMessageLog

QgsMessageLog.logMessage("test", tag="Processing", level=QgsMessageLog.INFO)

the log result is wrote under the console log panel called "Processing", but not in the processing GUI log tab.

Answer

You can do this with global variable progress. see the user manual, processing chapter

progress.setText('Youpi')

Will print 'Youpi' in the processing log.

It supports html formatting:

progress.setText('Youpi')

to print in bold...

progress come also with setPercentage() methods to control the progress bar