--- a/setup.py	Fri Sep 19 12:40:07 2025 +0200
+++ b/setup.py	Fri Sep 19 18:19:48 2025 +0200
@@ -366,27 +366,63 @@
     Returns `(sha, comment, diff, branch)`, all items are str or None if not
     available.
 
+    Also handles Mercurial repository information.
+
     directory:
         Root of git checkout.
     '''
     sha, comment, diff, branch = '', '', '', ''
-    cp = subprocess.run(
-            f'cd {directory} && (PAGER= git show --pretty=oneline|head -n 1 && git diff)',
-            capture_output=1,
-            shell=1,
-            text=1,
-            )
-    if cp.returncode == 0:
-        sha, _ = cp.stdout.split(' ', 1)
-        comment, diff = _.split('\n', 1)
-    cp = subprocess.run(
-            f'cd {directory} && git rev-parse --abbrev-ref HEAD',
-            capture_output=1,
-            shell=1,
-            text=1,
-            )
-    if cp.returncode == 0:
-        branch = cp.stdout.strip()
+    if os.path.isdir(os.path.join(directory, '.hg')):
+        cp = subprocess.run(
+                f'hg -R {directory} id -i',
+                capture_output=1,
+                shell=1,
+                text=1,
+                )
+        if cp.returncode == 0:
+            sha = cp.stdout.strip()
+        cp = subprocess.run(
+                f'hg -R {directory} diff --git',
+                capture_output=1,
+                shell=1,
+                text=1,
+                )
+        if cp.returncode == 0:
+            diff = cp.stdout
+        cp = subprocess.run(
+                f'hg -R {directory} log -r. --template "{{branch}}"',
+                capture_output=1,
+                shell=1,
+                text=1,
+                )
+        if cp.returncode == 0:
+            branch = cp.stdout.strip()
+        fp = subprocess.run(
+                f'hg -R {directory} log -r. --template "{{desc|firstline}}"',
+                capture_output=1,
+                shell=1,
+                text=1,
+                )
+        if cp.returncode == 0:
+            comment = cp.stdout.strip()
+    else:
+        cp = subprocess.run(
+                f'cd {directory} && (PAGER= git show --pretty=oneline|head -n 1 && git diff)',
+                capture_output=1,
+                shell=1,
+                text=1,
+                )
+        if cp.returncode == 0:
+            sha, _ = cp.stdout.split(' ', 1)
+            comment, diff = _.split('\n', 1)
+        cp = subprocess.run(
+                f'cd {directory} && git rev-parse --abbrev-ref HEAD',
+                capture_output=1,
+                shell=1,
+                text=1,
+                )
+        if cp.returncode == 0:
+            branch = cp.stdout.strip()
     log(f'git_info(): directory={directory!r} returning branch={branch!r} sha={sha!r} comment={comment!r}')
     return sha, comment, diff, branch