Add i.tasscap algorithm

python/plugins/processing/algs/grass7/description/i.tasscap.txt

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+i.tasscap
+Performs Tasseled Cap (Kauth Thomas) transformation.
+Imagery (i.*)
+ParameterMultipleInput|input|Input rasters. Landsat4-7: bands 1,2,3,4,5,7; Landsat8: bands 2,3,4,5,6,7; MODIS: bands 1,2,3,4,5,6,7|3|False
+ParameterSelection|sensor|Satellite sensor|landsat4_tm;landsat5_tm;landsat7_etm;landsat8_oli;modis|0
+OutputDirectory|output|Output Directory

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

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    i_tasscap.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__ = '$Format:%H$'
+
+from i import multipleOutputDir, verifyRasterNum, regroupRasters
+from processing.core.parameters import getParameterFromString
+
+
+def checkParameterValuesBeforeExecuting(alg):
+    return verifyRasterNum(alg, 'input', 6, 8)
+
+
+def processCommand(alg):
+    # Remove output
+    output = alg.getOutputFromName('output')
+    alg.removeOutputFromName('output')
+
+    # Create output parameter
+    param = getParameterFromString("ParameterString|output|output basename|None|False|False")
+    param.value = alg.getTempFilename()
+    alg.addParameter(param)
+
+    alg.processCommand()
+
+    # re-add output
+    alg.addOutput(output)
+
+
+def processOutputs(alg):
+    param = alg.getParameterFromName('output')
+    multipleOutputDir(alg, 'output', param.value)
+
+    # Delete output parameter
+    alg.parameters.remove(param)