Add v.extrude algorithm

python/plugins/processing/algs/grass7/description/v.extrude.txt

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+v.extrude
+Extrudes flat vector object to 3D with defined height.
+Vector (v.*)
+ParameterVector|input|Name of input 2D vector map|-1|False
+ParameterString|where|WHERE conditions of SQL statement without 'where' keyword|None|True|True
+ParameterNumber|zshift|Shifting value for z coordinates|0.0|None|0.0|True
+ParameterString|height|Fixed height for 3D vector objects (float)|None|False|True
+ParameterTableField|height_column|Name of attribute column with object heights|input|0|True
+ParameterRaster|elevation|Elevation raster for height extraction|True
+ParameterSelection|method|Sampling interpolation method|nearest;bilinear;bicubic|0
+ParameterNumber|scale|Scale factor sampled raster values|0.0|None|1.0|True
+ParameterString|null_value|Height for sampled raster NULL values|None|False|True
+*ParameterBoolean|-t|Trace elevation|False
+OutputVector|output|3D Vector

python/plugins/processing/algs/grass7/ext/v_extrude.py

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    v_extrude.py
+    ------------
+    Date                 : March 2016
+    Copyright            : (C) 2016 by Médéric Ribreux
+    Email                : medspx at medspx dot fr
+***************************************************************************
+*                                                                         *
+*   This program is free software; you can redistribute it and/or modify  *
+*   it under the terms of the GNU General Public License as published by  *
+*   the Free Software Foundation; either version 2 of the License, or     *
+*   (at your option) any later version.                                   *
+*                                                                         *
+***************************************************************************
+"""
+
+__author__ = 'Médéric Ribreux'
+__date__ = 'March 2016'
+__copyright__ = '(C) 2016, Médéric Ribreux'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+
+def checkParameterValuesBeforeExecuting(alg):
+    """ Verify if we have the right parameters """
+    height = alg.getParameterValue('height')
+    height_column = alg.getParameterValue('height_column')
+    if (height and height_column) or (not height and not height_column):
+        return alg.tr("You need to set either a fixed height value or the height column!")
+
+    return None