From 763062856afe153375e5054821ee67dec4d1f727 Mon Sep 17 00:00:00 2001
From: khushjeet58 <khushjeet.cse@gmail.com>
Date: Fri, 31 Jul 2026 10:36:37 +0530
Subject: [PATCH 1/2] r.out.xyz: add bottom-to-top output option

---
 scripts/r.out.xyz/r.out.xyz.py                | 29 ++++++++++++++--
 scripts/r.out.xyz/testsuite/test_r_out_xyz.py | 33 +++++++++++++++++++
 2 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/scripts/r.out.xyz/r.out.xyz.py b/scripts/r.out.xyz/r.out.xyz.py
index 6df97f3c202..8273f6dd6bf 100755
--- a/scripts/r.out.xyz/r.out.xyz.py
+++ b/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
@@ -47,6 +51,7 @@ 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 = {
@@ -54,14 +59,34 @@ def main():
         "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:
+                with open(output, "w", encoding="utf-8") as f:
+                    f.write(output_text)
+            else:
+                print(output_text, end="")
+        else:
+            grass.run_command("r.stats", **parameters)
+
     except CalledModuleError:
         ret = 1
+
     sys.exit(ret)
 
 
diff --git a/scripts/r.out.xyz/testsuite/test_r_out_xyz.py b/scripts/r.out.xyz/testsuite/test_r_out_xyz.py
index 615a410505f..75e1add64c9 100644
--- a/scripts/r.out.xyz/testsuite/test_r_out_xyz.py
+++ b/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()

From 8ec4c9aef24b800f987a9b2fe8fccc218b93bb11 Mon Sep 17 00:00:00 2001
From: Khushjeet Singh Bhati <khushjeet.cse@gmail.com>
Date: Fri, 2 Oct 2026 22:16:21 +0530
Subject: [PATCH 2/2] Update scripts/r.out.xyz/r.out.xyz.py

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 scripts/r.out.xyz/r.out.xyz.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/scripts/r.out.xyz/r.out.xyz.py b/scripts/r.out.xyz/r.out.xyz.py
index 8273f6dd6bf..62f877c42da 100755
--- a/scripts/r.out.xyz/r.out.xyz.py
+++ b/scripts/r.out.xyz/r.out.xyz.py
@@ -77,8 +77,7 @@ def main():
                 output_text = "\n".join(lines)
 
             if output:
-                with open(output, "w", encoding="utf-8") as f:
-                    f.write(output_text)
+                pathlib.Path(output).write_text(output_text, encoding="utf-8")
             else:
                 print(output_text, end="")
         else: