Add i.gensig algorithm

Author: Médéric RIBREUX

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

@@ -0,0 +1,7 @@
+i.gensig
+Generates statistics for i.maxlik from raster map.
+Imagery (i.*)
+ParameterRaster|trainingmap|Ground truth training map|False
+ParameterMultipleInput|input|Input rasters|3|False
+OutputFile|signaturefile|Signature File
+

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

@@ -0,0 +1,51 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    i_gensig.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 regroupRasters, file2Output, moveFile
+from os import path
+from ..Grass7Utils import Grass7Utils
+
+
+def processCommand(alg):
+    # Transform output files in string parameter
+    signatureFile = alg.getOutputFromName('signaturefile')
+    origSigFile = signatureFile.value
+    shortSigFile = path.basename(origSigFile)
+    alg.setOutputValue('signaturefile', shortSigFile)
+
+    signatureFile = file2Output(alg, 'signaturefile')
+
+    # Regroup rasters
+    group, subgroup = regroupRasters(alg, 'input', 'group', 'subgroup')
+
+    # Re-add signature files
+    alg.addOutput(signatureFile)
+
+    # Find Grass directory
+    interSig = path.join(Grass7Utils.grassMapsetFolder(), 'PERMANENT', 'group', group, 'subgroup', subgroup, 'sig', shortSigFile)
+    moveFile(alg, interSig, origSigFile)
+    alg.setOutputValue('signaturefile', origSigFile)