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Subject[PATCH v6 08/80] scripts: kernel-doc: allow passing desired Sphinx C domain dialect
Date
When kernel-doc is called via kerneldoc.py, there's no need to
auto-detect the Sphinx version, as the Sphinx module already
knows it. So, add an optional parameter to allow changing the
Sphinx dialect.

As kernel-doc can also be manually called, keep the auto-detection
logic if the parameter was not specified. On such case, emit
a warning if sphinx-build can't be found at PATH.

I ended using a suggestion from Joe for using a more readable
regex, instead of using a complex one with a hidden group like:

m/^(\d+)\.(\d+)(?:\.?(\d+)?)/

in order to get the optional <patch> argument.

Thanks-to: Joe Perches <joe@perches.com>
Suggested-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
Documentation/sphinx/kerneldoc.py | 5 +++
scripts/kernel-doc | 51 ++++++++++++++++++++++++++-----
2 files changed, 48 insertions(+), 8 deletions(-)

diff --git a/Documentation/sphinx/kerneldoc.py b/Documentation/sphinx/kerneldoc.py
index 4bcbd6ae01cd..1a1b12242a45 100644
--- a/Documentation/sphinx/kerneldoc.py
+++ b/Documentation/sphinx/kerneldoc.py
@@ -70,6 +70,11 @@ class KernelDocDirective(Directive):
env = self.state.document.settings.env
cmd = [env.config.kerneldoc_bin, '-rst', '-enable-lineno']

+ # Pass the version string to kernel-doc, as it needs to use a different
+ # dialect, depending what the C domain supports for each specific
+ # Sphinx versions
+ cmd += ['-sphinx-version', sphinx.__version__]
+
filename = env.config.kerneldoc_srctree + '/' + self.arguments[0]
export_file_patterns = []

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 09e3e78b9723..ed32883c3221 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -56,6 +56,13 @@ Output format selection (mutually exclusive):
-rst Output reStructuredText format.
-none Do not output documentation, only warnings.

+Output format selection modifier (affects only ReST output):
+
+ -sphinx-version Use the ReST C domain dialect compatible with an
+ specific Sphinx Version.
+ If not specified, kernel-doc will auto-detect using
+ the sphinx-build version found on PATH.
+
Output selection (mutually exclusive):
-export Only output documentation for symbols that have been
exported using EXPORT_SYMBOL() or EXPORT_SYMBOL_GPL()
@@ -270,7 +277,7 @@ if ($#ARGV == -1) {
}

my $kernelversion;
-my $sphinx_major;
+my ($sphinx_major, $sphinx_minor, $sphinx_patch);

my $dohighlight = "";

@@ -457,6 +464,23 @@ while ($ARGV[0] =~ m/^--?(.*)/) {
$enable_lineno = 1;
} elsif ($cmd eq 'show-not-found') {
$show_not_found = 1; # A no-op but don't fail
+ } elsif ($cmd eq "sphinx-version") {
+ my $ver_string = shift @ARGV;
+ if ($ver_string =~ m/^(\d+)(\.\d+)?(\.\d+)?/) {
+ $sphinx_major = $1;
+ if (defined($2)) {
+ $sphinx_minor = substr($2,1);
+ } else {
+ $sphinx_minor = 0;
+ }
+ if (defined($3)) {
+ $sphinx_patch = substr($3,1)
+ } else {
+ $sphinx_patch = 0;
+ }
+ } else {
+ die "Sphinx version should either major.minor or major.minor.patch format\n";
+ }
} else {
# Unknown argument
usage();
@@ -477,29 +501,37 @@ sub findprog($)
sub get_sphinx_version()
{
my $ver;
- my $major = 1;

my $cmd = "sphinx-build";
if (!findprog($cmd)) {
my $cmd = "sphinx-build3";
- return $major if (!findprog($cmd));
+ if (!findprog($cmd)) {
+ $sphinx_major = 1;
+ $sphinx_minor = 2;
+ $sphinx_patch = 0;
+ printf STDERR "Warning: Sphinx version not found. Using default (Sphinx version %d.%d.%d)\n",
+ $sphinx_major, $sphinx_minor, $sphinx_patch;
+ return;
+ }
}

open IN, "$cmd --version 2>&1 |";
while (<IN>) {
if (m/^\s*sphinx-build\s+([\d]+)\.([\d\.]+)(\+\/[\da-f]+)?$/) {
- $major=$1;
+ $sphinx_major = $1;
+ $sphinx_minor = $2;
+ $sphinx_patch = $3;
last;
}
# Sphinx 1.2.x uses a different format
if (m/^\s*Sphinx.*\s+([\d]+)\.([\d\.]+)$/) {
- $major=$1;
+ $sphinx_major = $1;
+ $sphinx_minor = $2;
+ $sphinx_patch = $3;
last;
}
}
close IN;
-
- return $major;
}

# get kernel version from env
@@ -2333,7 +2365,10 @@ sub process_file($) {
}


-$sphinx_major = get_sphinx_version();
+if ($output_mode eq "rst") {
+ get_sphinx_version() if (!$sphinx_major);
+}
+
$kernelversion = get_kernel_version();

# generate a sequence of code that will splice in highlighting information
--
2.26.2
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