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From:   Mauro Carvalho Chehab <mchehab@kernel.org>
To:     Linux Doc Mailing List <linux-doc@vger.kernel.org>,
        Jonathan Corbet <corbet@lwn.net>
Cc:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        "Hans de Goede" <hdegoede@redhat.com>,
        "Stephen Rothwell" <sfr@canb.auug.org.au>,
        Randy Dunlap <rdunlap@infradead.org>,
        linux-kernel@vger.kernel.org
Subject: [PATCH v2 3/4] docs: kernel_feat.py: add build dependencies
Date:   Fri, 25 Mar 2022 15:05:13 +0100
Message-Id: <c4684a9a6ddd59e894b3f2776044f713b53ee9ca.1648216561.git.mchehab@kernel.org>
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Ensure that the feature files will be regenerated if any
changes happen at the Documentation/features files that were
processed by gen_feat.pl.

Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
---

To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
See [PATCH v2 0/4] at: https://lore.kernel.org/all/cover.1648216561.git.mchehab@kernel.org/

 Documentation/sphinx/kernel_feat.py | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/Documentation/sphinx/kernel_feat.py b/Documentation/sphinx/kernel_feat.py
index 8138d69a6987..6b40ac1806bb 100644
--- a/Documentation/sphinx/kernel_feat.py
+++ b/Documentation/sphinx/kernel_feat.py
@@ -33,6 +33,7 @@ u"""
 
 import codecs
 import os
+import re
 import subprocess
 import sys
 
@@ -82,7 +83,7 @@ class KernelFeat(Directive):
 
         env = doc.settings.env
         cwd = path.dirname(doc.current_source)
-        cmd = "get_feat.pl rest --dir "
+        cmd = "get_feat.pl rest --enable-fname --dir "
         cmd += self.arguments[0]
 
         if len(self.arguments) > 1:
@@ -102,7 +103,22 @@ class KernelFeat(Directive):
         shell_env["srctree"] = srctree
 
         lines = self.runCmd(cmd, shell=True, cwd=cwd, env=shell_env)
-        nodeList = self.nestedParse(lines, fname)
+
+        line_regex = re.compile("^#define FILE (\S+)$")
+
+        out_lines = ""
+
+        for line in lines.split("\n"):
+            match = line_regex.search(line)
+            if match:
+                fname = match.group(1)
+
+                # Add the file to Sphinx build dependencies
+                env.note_dependency(os.path.abspath(fname))
+            else:
+                out_lines += line + "\n"
+
+        nodeList = self.nestedParse(out_lines, fname)
         return nodeList
 
     def runCmd(self, cmd, **kwargs):
-- 
2.35.1