Add r.tile algorithm

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

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+r.tile
+Splits a raster map into tiles
+Raster (r.*)
+ParameterRaster|input|Name of input raster map|False
+ParameterString|output|Output base name of rasters|None|False|False
+ParameterNumber|width|Width of tiles (columns)|1|None|1024|True
+ParameterNumber|height|Height of tiles (rows)|1|None|1024|True
+OutputDirectory|output_dir|Tiles Directory

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

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    r_tile.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__ = '$Format:%H$'
+
+
+def processCommand(alg):
+    # Remove output for command
+    output_dir = alg.getOutputFromName('output_dir')
+    alg.removeOutputFromName('output_dir')
+    alg.processCommand()
+    alg.addOutput(output_dir)
+
+
+def processOutputs(alg):
+    # All the named rasters should be extracted to output_dir
+    basename = alg.getParameterValue('output')
+    output_dir = alg.getOutputValue('output_dir')
+
+    # Get the list of rasters matching the basename
+    commands = ["for r in $(g.list type=rast pattern='{}*'); do".format(basename)]
+    commands.append("  r.out.gdal -t input=${{r}} output={}/${{r}}.tif createopt=\"TFW=YES,COMPRESS=LZW\"".format(output_dir))
+    commands.append("done")
+    alg.commands.extend(commands)