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#!/bin/bash
# (c) 2017, Jonathan Corbet <corbet@lwn.net>
#           sayli karnik <karniksayli1995@gmail.com>
#
# This script detects files with kernel-doc comments for exported functions
# that are not included in documentation.
#
# usage: Run 'scripts/find-unused-docs.sh directory' from top level of kernel
# 	 tree.
#
# example: $scripts/find-unused-docs.sh drivers/scsi
#
# Licensed under the terms of the GNU GPL License

if ! [ -d "Documentation" ]; then
	echo "Run from top level of kernel tree"
	exit 1
fi

if [ "$#" -ne 1 ]; then
	echo "Usage: scripts/find-unused-docs.sh directory"
	exit 1
fi

if ! [ -d "$1" ]; then
	echo "Directory $1 doesn't exist"
	exit 1
fi

cd "$( dirname "${BASH_SOURCE[0]}" )"
cd ..

cd Documentation/

echo "The following files contain kerneldoc comments for exported functions \
that are not used in the formatted documentation"

# FILES INCLUDED

files_included=($(grep -rHR ".. kernel-doc" --include \*.rst | cut -d " " -f 3))

declare -A FILES_INCLUDED

for each in "${files_included[@]}"; do
	FILES_INCLUDED[$each]="$each"
	done

cd ..

# FILES NOT INCLUDED

for file in `find $1 -name '*.c'`; do

	if [[ ${FILES_INCLUDED[$file]+_} ]]; then
	continue;
	fi
	str=$(scripts/kernel-doc -text -export "$file" 2>/dev/null)
	if [[ -n "$str" ]]; then
	echo "$file"
	fi
	done