linux-imx/scripts/documentation-file-ref-check

#!/usr/bin/env perl

SPDX-License-Identifier: GPL-2.0

Treewide grep for references to files under Documentation, and report

non-existing files in stderr.

use warnings; use strict; use Getopt::Long qw(:config no_auto_abbrev);

NOTE: only add things here when the file was gone, but the text wants

to mention a past documentation file, for example, to give credits for

the original work.

my %false_positives = ( "Documentation/scsi/scsi_mid_low_api.rst" => "Documentation/Configure.help", "drivers/vhost/vhost.c" => "Documentation/virtual/lguest/lguest.c", );

my $scriptname = $0; $scriptname =~ s,.*/([^/]+/),$1,;

Parse arguments

my $help = 0; my $fix = 0; my $warn = 0;

if (! -d ".git") { printf "Warning: can't check if file exists, as this is not a git tree"; exit 0; }

GetOptions( 'fix' => $fix, 'warn' => $warn, 'h|help|usage' => $help, );

if ($help != 0) { print "$scriptname [--help] [--fix]\n"; exit -1; }

Step 1: find broken references

print "Finding broken references. This may take a while... " if ($fix);

my %broken_ref;

my $doc_fix = 0;

open IN, "git grep ':doc:`' Documentation/|" or die "Failed to run git grep"; while () { next if (!m,^([^:]+):.*:doc:`([^`]+)`,); next if (m,sphinx/,);

my $file = $1;
my $d = $1;
my $doc_ref = $2;

my $f = $doc_ref;

$d =~ s,(.*/).*,$1,;
$f =~ s,.*\<([^\>]+)\>,$1,;

if ($f =~ m,^/,) {
	$f = "$f.rst";
	$f =~ s,^/,Documentation/,;
} else {
	$f = "$d$f.rst";
}

next if (grep -e, glob("$f"));

if ($fix && !$doc_fix) {
	print STDERR "\nWARNING: Currently, can't fix broken :doc:`` fields\n";
}
$doc_fix++;

print STDERR "$file: :doc:`$doc_ref`\n";

} close IN;

open IN, "git grep 'Documentation/'|" or die "Failed to run git grep"; while () { next if (!m/^([^:]+):(.*)/);

my $f = $1;
my $ln = $2;

# On linux-next, discard the Next/ directory
next if ($f =~ m,^Next/,);

# Makefiles and scripts contain nasty expressions to parse docs
next if ($f =~ m/Makefile/ || $f =~ m/\.sh$/);

# Skip this script
next if ($f eq $scriptname);

# Ignore the dir where documentation will be built
next if ($ln =~ m,\b(\S*)Documentation/output,);

if ($ln =~ m,\b(\S*)(Documentation/[A-Za-z0-9\_\.\,\~/\*\[\]\?+-]*)(.*),) {
	my $prefix = $1;
	my $ref = $2;
	my $base = $2;
	my $extra = $3;

	# some file references are like:
	# /usr/src/linux/Documentation/DMA-{API,mapping}.txt
	# For now, ignore them
	next if ($extra =~ m/^{/);

	# Remove footnotes at the end like:
	# Documentation/devicetree/dt-object-internal.txt[1]
	$ref =~ s/(txt|rst)\[\d+]$/$1/;

	# Remove ending ']' without any '['
	$ref =~ s/\].*// if (!($ref =~ m/\[/));

	# Remove puntuation marks at the end
	$ref =~ s/[\,\.]+$//;

	my $fulref = "$prefix$ref";

	$fulref =~ s/^(\<file|ref)://;
	$fulref =~ s/^[\'\`]+//;
	$fulref =~ s,^\$\(.*\)/,,;
	$base =~ s,.*/,,;

	# Remove URL false-positives
	next if ($fulref =~ m/^http/);

	# Remove sched-pelt false-positive
	next if ($fulref =~ m,^Documentation/scheduler/sched-pelt$,);

	# Discard some build examples from Documentation/target/tcm_mod_builder.rst
	next if ($fulref =~ m,mnt/sdb/lio-core-2.6.git/Documentation/target,);

	# Check if exists, evaluating wildcards
	next if (grep -e, glob("$ref $fulref"));

	# Accept relative Documentation patches for tools/
	if ($f =~ m/tools/) {
		my $path = $f;
		$path =~ s,(.*)/.*,$1,;
		next if (grep -e, glob("$path/$ref $path/../$ref $path/$fulref"));
	}

	# Discard known false-positives
	if (defined($false_positives{$f})) {
		next if ($false_positives{$f} eq $fulref);
	}

	if ($fix) {
		if (!($ref =~ m/(scripts|Kconfig|Kbuild)/)) {
			$broken_ref{$ref}++;
		}
	} elsif ($warn) {
		print STDERR "Warning: $f references a file that doesn't exist: $fulref\n";
	} else {
		print STDERR "$f: $fulref\n";
	}
}

} close IN;

exit 0 if (!$fix);

Step 2: Seek for file name alternatives

print "Auto-fixing broken references. Please double-check the results\n";

foreach my $ref (keys %broken_ref) { my $new =$ref;

my $basedir = ".";
# On translations, only seek inside the translations directory
$basedir  = $1 if ($ref =~ m,(Documentation/translations/[^/]+),);

# get just the basename
$new =~ s,.*/,,;

my $f="";

# usual reason for breakage: DT file moved around
if ($ref =~ /devicetree/) {
	# usual reason for breakage: DT file renamed to .yaml
	if (!$f) {
		my $new_ref = $ref;
		$new_ref =~ s/\.txt$/.yaml/;
		$f=$new_ref if (-f $new_ref);
	}

	if (!$f) {
		my $search = $new;
		$search =~ s,^.*/,,;
		$f = qx(find Documentation/devicetree/ -iname "*$search*") if ($search);
		if (!$f) {
			# Manufacturer name may have changed
			$search =~ s/^.*,//;
			$f = qx(find Documentation/devicetree/ -iname "*$search*") if ($search);
		}
	}
}

# usual reason for breakage: file renamed to .rst
if (!$f) {
	$new =~ s/\.txt$/.rst/;
	$f=qx(find $basedir -iname $new) if ($new);
}

# usual reason for breakage: use dash or underline
if (!$f) {
	$new =~ s/[-_]/[-_]/g;
	$f=qx(find $basedir -iname $new) if ($new);
}

# Wild guess: seek for the same name on another place
if (!$f) {
	$f = qx(find $basedir -iname $new) if ($new);
}

my @find = split /\s+/, $f;

if (!$f) {
	print STDERR "ERROR: Didn't find a replacement for $ref\n";
} elsif (scalar(@find) > 1) {
	print STDERR "WARNING: Won't auto-replace, as found multiple files close to $ref:\n";
	foreach my $j (@find) {
		$j =~ s,^./,,;
		print STDERR "    $j\n";
	}
} else {
	$f = $find[0];
	$f =~ s,^./,,;
	print "INFO: Replacing $ref to $f\n";
	foreach my $j (qx(git grep -l $ref)) {
		qx(sed "s\@$ref\@$f\@g" -i $j);
	}
}

}