[PATCH 4/4] Documentation: gen_commands: deduplicate entries from multiple definitions

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Some commands, like cpuinfo, are defined once per architecture with
identical BAREBOX_CMD_DESC/OPTS/HELP blocks. When several such
definitions end up in one parse run, the generated rst repeated the
description, usage string and every option once per definition:

  https://www.barebox.org/doc/2026.07.0/commands/info/cpuinfo.html

Deduplicate descriptions, usage strings and option lists before
emitting them, and join multiple usage strings with a space instead of
concatenating them back to back. Also preserve leading indentation of
help text lines by only stripping trailing whitespace, so preformatted
help text is not flattened.

Assisted-by: Claude:fable-5
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 Documentation/gen_commands.py | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/Documentation/gen_commands.py b/Documentation/gen_commands.py
index 1a7353a854cd..04d7cc3b435a 100755
--- a/Documentation/gen_commands.py
+++ b/Documentation/gen_commands.py
@@ -57,7 +57,7 @@ def parse_c(name):
 
         elif x := HELP_TEXT.match(line):
             last = cmd['h_post' if 'h_opts' in cmd else 'h_pre']
-            last.append(string_escape_literal(x.group(1)).strip())
+            last.append(string_escape_literal(x.group(1)).rstrip())
 
         elif x := HELP_OPT.match(line):
             last = cmd['h_opts']
@@ -97,6 +97,17 @@ def parse_c(name):
                 cmd = last = None
 
 
+def uniq(seq):
+    seen = set()
+    out = []
+    for x in seq:
+        key = tuple(x) if isinstance(x, list) else x
+        if key not in seen:
+            seen.add(key)
+            out.append(x)
+    return out
+
+
 def gen_rst(name, cmd):
     out = []
     out.append('.. index:: %s (command)' % name)
@@ -104,7 +115,7 @@ def gen_rst(name, cmd):
     out.append('.. _command_%s:' % name)
     out.append('')
     if 'c_desc' in cmd:
-        out.append("%s - %s" % (string_escape(name), ''.join(cmd['c_desc']).strip()))
+        out.append("%s - %s" % (string_escape(name), ''.join(uniq(cmd['c_desc'])).strip()))
     else:
         out.append("%s" % (string_escape(name),))
     out.append('=' * len(out[-1]))
@@ -112,7 +123,7 @@ def gen_rst(name, cmd):
     if 'c_opts' in cmd:
         out.append('Usage')
         out.append('^' * len(out[-1]))
-        out.append('``%s %s``' % (name, ''.join(cmd['c_opts']).strip()))
+        out.append('``%s %s``' % (name, ' '.join(uniq(cmd['c_opts'])).strip()))
         out.append('')
     if 'h_pre' in cmd:
         pre = cmd['h_pre']
@@ -129,7 +140,7 @@ def gen_rst(name, cmd):
     if 'h_opts' in cmd:
         out.append('Options')
         out.append('^' * len(out[-1]))
-        for o, d in cmd['h_opts']:
+        for o, d in uniq(cmd['h_opts']):
             o = o.strip()
             d = d.strip()
             if o:
-- 
2.47.3