Add r.mapcalc algorithm

python/plugins/processing/algs/grass7/description/r.mapcalc.txt

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+r.mapcalc
+Raster map calculator. 
+Raster (r.*)
+ParameterMultipleInput|maps|Raster maps used in the calculator|3|True
+ParameterString|expression|Expression to evaluate. The raster names used in expression should be the same than in QGIS|None|True|True
+ParameterFile|file|File containing expression(s) to evaluate (same rule for raster names than above)|True
+ParameterString|seed|Integer seed for rand() function|None|False|True
+*ParameterBoolean|-s|Generate random seed (result is non-deterministic)|False
+OutputDirectory|output_dir|Results Directory

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

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    r_mapcalc.py
+    ------------
+    Date                 : February 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__ = 'February 2016'
+__copyright__ = '(C) 2016, Médéric Ribreux'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+from os import path
+
+
+def checkParameterValuesBeforeExecuting(alg):
+    """ Verify if we have the right parameters """
+    if alg.getParameterValue('expression') and alg.getParameterValue('file'):
+        return alg.tr("You need to set either inline expression or a rules file !")
+
+    return None
+
+
+def processInputs(alg):
+    # We need to use the same raster names than in QGIS
+    if alg.getParameterValue('maps'):
+        rasters = alg.getParameterValue('maps').split(',')
+        for raster in rasters:
+            if raster in alg.exportedLayers.keys():
+                continue
+
+            alg.setSessionProjectionFromLayer(raster, alg.commands)
+            destFilename = path.splitext(path.basename(raster))[0]
+            alg.exportedLayers[raster] = destFilename
+            command = 'r.in.gdal input={} output={} --overwrite -o'.format(raster, destFilename)
+            alg.commands.append(command)
+
+    alg.setSessionProjectionFromProject(alg.commands)
+
+    region = unicode(alg.getParameterValue(alg.GRASS_REGION_EXTENT_PARAMETER))
+    regionCoords = region.split(',')
+    command = 'g.region'
+    command += ' -a'
+    command += ' n=' + unicode(regionCoords[3])
+    command += ' s=' + unicode(regionCoords[2])
+    command += ' e=' + unicode(regionCoords[1])
+    command += ' w=' + unicode(regionCoords[0])
+    cellsize = alg.getParameterValue(alg.GRASS_REGION_CELLSIZE_PARAMETER)
+    if cellsize:
+        command += ' res=' + unicode(cellsize)
+    else:
+        command += ' res=' + unicode(alg.getDefaultCellsize())
+    alignToResolution = alg.getParameterValue(alg.GRASS_REGION_ALIGN_TO_RESOLUTION)
+    if alignToResolution:
+        command += ' -a'
+    alg.commands.append(command)
+
+
+def processCommand(alg):
+    # Remove output for command
+    output_dir = alg.getOutputFromName('output_dir')
+    maps = alg.getParameterFromName('maps')
+    alg.removeOutputFromName('output_dir')
+    alg.parameters.remove(maps)
+    alg.processCommand()
+    alg.addOutput(output_dir)
+    alg.addParameter(maps)
+
+
+def processOutputs(alg):
+    # Export everything into Output Directory with shell commands
+    outputDir = alg.getOutputValue('output_dir')
+
+    # Get the list of rasters matching the basename
+    commands = ["for r in $(g.list type=rast); do"]
+    commands.append("  r.out.gdal input=${{r}} output={}/${{r}}.tif createopt=\"TFW=YES,COMPRESS=LZW\" --overwrite".format(outputDir))
+    commands.append("done")
+    alg.commands.extend(commands)
+    alg.outputCommands.extend(commands)