Add v.lrs.create algorithm

python/plugins/processing/algs/grass7/description/v.lrs.create.txt

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+v.lrs.create
+Creates Linear Reference System
+Vector (v.*)
+ParameterVector|in_lines|Input vector map containing lines|1|False
+ParameterVector|points|Input vector map containing reference points|0|False
+ParameterTableField|lidcol|Column containing line identifiers for lines|in_lines|0|False
+ParameterTableField|pidcol|Column containing line identifiers for points|points|0|False
+ParameterTableField|start_mp|Column containing milepost position for the beginning of next segment|points|0|False
+ParameterTableField|start_off|Column containing offset from milepost for the beginning of next segment|points|0|False
+ParameterTableField|end_mp|Column containing milepost position for the end of previous segment|points|0|False
+ParameterTableField|end_off|Column containing offset from milepost for the end of previous segment|points|0|False
+ParameterNumber|thresh|Maximum distance of point to line allowed|0|None|1|True
+OutputVector|out_lines|LRS lines
+OutputVector|err|LRS Errors
+OutputTable|rstable|RS Table

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

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    v_lrs_create.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__ = '$Format:%H$'
+
+import os
+
+
+def processOutputs(alg):
+    # add some export commands
+    command = 'v.build.all'
+    alg.commands.append(command)
+
+    # export the SQLite table to CSV
+    rstable = alg.getOutputValue('rstable')
+    # I don't use db.out.ogr because it doesn't work
+    command = 'db.select table={} separator=comma output=\"{}\" --overwrite'.format(
+        alg.exportedLayers[rstable],
+        rstable
+    )
+    alg.commands.append(command)
+    alg.processOutputs()