r.out.xyz: add bottom-to-top output option

scripts/r.out.xyz/r.out.xyz.py

@@ -37,6 +37,10 @@
 # % key: i
 # % description: Include no data values
 # %end
+# %flag
+# % key: b
+# % description: Output rows from bottom to top
+# %end
 
 import sys
 from grass.script import core as grass
@@ -47,21 +51,41 @@ def main():
     # if no output filename, output to stdout
     output = options["output"]
     donodata = flags["i"]
+    bottom_to_top = flags["b"]
 
     statsflags = "1g" if donodata else "1gn"
     parameters = {
         "flags": statsflags,
         "input": options["input"],
         "separator": options["separator"],
     }
-    if output:
+    if output and not bottom_to_top:
         parameters.update(output=output)
 
     ret = 0
+
     try:
-        grass.run_command("r.stats", **parameters)
+        if bottom_to_top:
+            output_text = grass.read_command("r.stats", **parameters)
+
+            lines = output_text.splitlines()
+            lines.reverse()
+
+            if output_text.endswith("\n"):
+                output_text = "\n".join(lines) + "\n"
+            else:
+                output_text = "\n".join(lines)
+
+            if output:
+                pathlib.Path(output).write_text(output_text, encoding="utf-8")
+            else:
+                print(output_text, end="")
+        else:
+            grass.run_command("r.stats", **parameters)
+
     except CalledModuleError:
         ret = 1
+
     sys.exit(ret)
 
 

scripts/r.out.xyz/testsuite/test_r_out_xyz.py

@@ -27,6 +27,8 @@ def tearDownClass(cls):
         """Remove temporary region"""
         cls.del_temp_region()
         Path(cls.csvFile).unlink(missing_ok=True)
+        Path("normal.csv").unlink(missing_ok=True)
+        Path("bottom.csv").unlink(missing_ok=True)
 
     def test_r_out_xyz(self):
         """ASCII text file test"""
@@ -37,6 +39,37 @@ def test_r_out_xyz(self):
 
         self.assertFileExists(filename=self.csvFile)
 
+    def test_r_out_xyz_bottom_to_top(self):
+        """Test bottom-to-top output ordering"""
+
+        normal_file = "normal.csv"
+        bottom_file = "bottom.csv"
+
+        module = SimpleModule(
+            "r.out.xyz",
+            input=self.mapName,
+            output=normal_file,
+            separator=",",
+        )
+        self.assertModule(module)
+
+        module = SimpleModule(
+            "r.out.xyz",
+            input=self.mapName,
+            output=bottom_file,
+            separator=",",
+            flags="b",
+        )
+        self.assertModule(module)
+
+        with open(normal_file, encoding="utf-8") as f:
+            normal_lines = f.read().splitlines()
+
+        with open(bottom_file, encoding="utf-8") as f:
+            bottom_lines = f.read().splitlines()
+
+        self.assertEqual(bottom_lines, list(reversed(normal_lines)))
+
 
 if __name__ == "__main__":
     test()