[Qgis-developer] [Feature][Processing] Headless

[rldhont]

Hi dev,

I just created a pull request to run QGIS-Processing headless.
I have tested it with a qgis and a modeler algorithm.

https://github.com/qgis/QGIS/pull/1031

Review and comments are welcome

To test QGIS Processing algorithm headlessly, you can use this python code
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import sys, os
import inspect

from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *


# supply path to where is your qgis installed
QgsApplication.setPrefixPath("/path/to/your/qgis/build", True)

# load providers
QgsApplication.initQgis()

# load a project
p = QgsProject.instance()
p.read( QFileInfo( "/path/to/a/project.qgs" ) )

# init QApplication for processing
a = QApplication( sys.argv )

# init QGIS Processing
from processing.core.Processing import Processing
cmd_folder = os.path.split(inspect.getfile(inspect.currentframe()))[0]
if cmd_folder not in sys.path:
     sys.path.insert(0, cmd_folder)
Processing.initialize()

# import QGIS Processing tools
from processing.tools import *

# print an algorithms search
general.alglist( 'buffer')

# print an algorithm help
general.help( 'qgis:fixeddistancebuffer' )


# run an algorithm
alg = Processing.getAlgorithm( 'qgis:fixeddistancebuffer' )
general.runalg( 'qgis:fixeddistancebuffer', '/vector/layer/input/uri', 
0.1, 5, False, '/vector/layer/output.shp' );

# quit
QgsApplication.exitQgis()
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export 
PYTHONPATH=/path/to/build/share/qgis/python:/path/to/build/share/qgis/python/plugins
export LD_LIBRARY_PATH=/path/to/build/lib
python my_scrpit.py
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Regards