#! /bin/sh
# SPDX-License-Identifier: BSD-3-Clause
# Copyright 2016 6WIND S.A.

# Check commit logs (headlines and references)
#
# If any doubt about the formatting, please check in the most recent history:
#	git log --format='%>|(15)%cr   %s' --reverse | grep -i <pattern>

print_usage () {
	cat <<- END_OF_HELP
	usage: $(basename $0) [-h] [-nX|-r range]

	Check commit log formatting.
	The git commits to be checked can be specified as a "git log" option,
	by latest git commits limited with -n option, or commits in the git
	range specified with -r option.
	e.g. To check only the last commit, ‘-n1’ or ‘-r@~..’ is used.
	If no range provided, default is origin/main..HEAD.
	END_OF_HELP
}

selfdir=$(dirname $(readlink -f $0))
# The script caters for two formats, the new preferred format, and the old
# format to ensure backward compatibility.
# The new format is aligned with the format of the checkpatches script,
# and allows for specifying the patches to check by passing -nX or -r range.
# The old format allows for specifying patches by passing -X or range
# as the first argument.
range=${1:-origin/main..}

if [ "$range" = '--help' ] ; then
	print_usage
	exit 0
# convert -N to HEAD~N.. in order to comply with git-log-fixes.sh getopts
elif printf -- "$range" | grep -q '^-[0-9]\+' ; then
	range="HEAD$(printf -- "$range" | sed 's,^-,~,').."
else
	while getopts hr:n: ARG ; do
		case $ARG in
			n ) range="HEAD~$OPTARG.." ;;
			r ) range=$OPTARG ;;
			h ) print_usage ; exit 0 ;;
			? ) print_usage ; exit 1 ;;
		esac
	done
	shift $(($OPTIND - 1))
fi

commits=$(git log --format='%h' --reverse $range)
headlines=$(git log --format='%s' --reverse $range)
bodylines=$(git log --format='%b' --reverse $range)
fixes=$(git log --format='%h %s' --reverse $range | grep -i ': *fix' | cut -d' ' -f1)
stablefixes=$($selfdir/git-log-fixes.sh $range | sed '/(N\/A)$/d'  | cut -d' ' -f2)
tags=$(git log --format='%b' --reverse $range | grep -i -e 'by *:' -e 'fix.*:')
bytag='\(Reported\|Suggested\|Signed-off\|Acked\|Reviewed\|Tested\)-by:'

failure=false

# check headline format (spacing, no punctuation, no code)
bad=$(echo "$headlines" | grep --color=always \
	-e '	' \
	-e '^ ' \
	-e ' $' \
	-e '\.$' \
	-e '[,;!?&|]' \
	-e ':.*_' \
	-e '^[^:]\+$' \
	-e ':[^ ]' \
	-e ' :' \
	| sed 's,^,\t,')
[ -z "$bad" ] || { printf "Wrong headline format:\n$bad\n" && failure=true;}

# check headline prefix when touching only drivers, e.g. net/<driver name>
bad=$(for commit in $commits ; do
	headline=$(git log --format='%s' -1 $commit)
	files=$(git diff-tree --no-commit-id --name-only -r $commit)
	[ -z "$(echo "$files" | grep -v '^\(drivers\|doc\|config\)/')" ] ||
		continue
	drv=$(echo "$files" | grep '^drivers/' | cut -d "/" -f 2,3 | sort -u)
	drvgrp=$(echo "$drv" | cut -d "/" -f 1 | uniq)
	if [ $(echo "$drvgrp" | wc -l) -gt 1 ] ; then
		echo "$headline" | grep -v '^drivers:'
	elif [ $(echo "$drv" | wc -l) -gt 1 ] ; then
		echo "$headline" | grep -v "^drivers/$drvgrp"
	else
		echo "$headline" | grep -v "^$drv"
	fi
done | sed 's,^,\t,')
[ -z "$bad" ] || { printf "Wrong headline prefix:\n$bad\n" && failure=true;}

# check headline label for common typos
bad=$(echo "$headlines" | grep --color=always \
	-e '^example[:/]' \
	-e '^apps/' \
	-e '^testpmd' \
	-e 'test-pmd' \
	-e '^bond:' \
	| sed 's,^,\t,')
[ -z "$bad" ] || { printf "Wrong headline label:\n$bad\n" && failure=true;}

# check headline lowercase for first words
bad=$(echo "$headlines" | grep --color=always \
	-e '^.*[[:upper:]].*:' \
	-e ': *[[:upper:]]' \
	| sed 's,^,\t,')
[ -z "$bad" ] || { printf "Wrong headline uppercase:\n$bad\n" && failure=true;}

# check headline case (Rx/Tx, VF, L2, MAC, Linux ...)
IFS='
'
words="$selfdir/words-case.txt"
for word in $(cat $words); do
	bad=$(echo "$headlines" | grep -iw $word | grep -v $word)
	if [ "$word" = "Tx" ]; then
		bad=$(echo $bad | grep -v 'OCTEON\ TX')
	fi
	for bad_line in $bad; do
		bad_word=$(echo $bad_line | cut -d":" -f2 | grep -io $word)
		[ -z "$bad_word" ] || { printf "Wrong headline case:\n\
			\"$bad_line\": $bad_word --> $word\n" && failure=true;}
	done
done

# check headline length (60 max)
bad=$(echo "$headlines" |
	awk 'length>60 {print}' |
	sed 's,^,\t,')
[ -z "$bad" ] || { printf "Headline too long:\n$bad\n" && failure=true;}

# check body lines length (75 max)
bad=$(echo "$bodylines" | grep -v '^Fixes:' |
	awk 'length>75 {print}' |
	sed 's,^,\t,')
[ -z "$bad" ] || { printf "Line too long:\n$bad\n" && failure=true;}

# check starting commit message with "It"
bad=$(for commit in $commits ; do
	firstbodyline=$(git log --format='%b' -1 $commit | head -n1)
	echo "$firstbodyline" | grep --color=always -ie '^It '
done | sed 's,^,\t,')
[ -z "$bad" ] || { printf "Wrong beginning of commit message:\n$bad\n"\
	&& failure=true;}

# check tags spelling
bad=$(echo "$tags" |
	grep -v "^$bytag [^,]* <.*@.*>$" |
	grep -v '^Fixes: [0-9a-f]\{7\}[0-9a-f]* (".*")$' |
	sed 's,^.,\t&,')
[ -z "$bad" ] || { printf "Wrong tag:\n$bad\n" && failure=true;}

# check missing Coverity issue: tag
bad=$(for commit in $commits; do
	body=$(git log --format='%b' -1 $commit)
	echo "$body" | grep -qi coverity || continue
	echo "$body" | grep -q '^Coverity issue:' && continue
	git log --format='\t%s' -1 $commit
done)
[ -z "$bad" ] || { printf "Missing 'Coverity issue:' tag:\n$bad\n"\
	&& failure=true;}

# check missing Bugzilla ID: tag
bad=$(for commit in $commits; do
	body=$(git log --format='%b' -1 $commit)
	echo "$body" | grep -qi bugzilla || continue
	echo "$body" | grep -q '^Bugzilla ID:' && continue
	git log --format='\t%s' -1 $commit
done)
[ -z "$bad" ] || { printf "Missing 'Bugzilla ID:' tag:\n$bad\n"\
	&& failure=true;}

# check missing Fixes: tag
bad=$(for fix in $fixes ; do
	git log --format='%b' -1 $fix | grep -q '^Fixes: ' ||
		git log --format='\t%s' -1 $fix
done)
[ -z "$bad" ] || { printf "Missing 'Fixes' tag:\n$bad\n" && failure=true;}

# check Fixes: reference
fixtags=$(echo "$tags" | grep '^Fixes: ')
bad=$(for fixtag in $fixtags ; do
	hash=$(echo "$fixtag" | sed 's,^Fixes: \([0-9a-f]*\).*,\1,')
	if git branch --contains $hash 2>&- | grep -q '^\*' ; then
		good="Fixes: $hash "$(git log --format='("%s")' -1 $hash 2>&-)
	else
		good="reference not in current branch"
	fi
	printf "$fixtag" | grep -v "^$good$"
done | sed 's,^,\t,')
[ -z "$bad" ] || { printf "Wrong 'Fixes' reference:\n$bad\n" && failure=true;}

# check Cc: stable@dpdk.org for fixes
bad=$(for fix in $stablefixes ; do
	git log --format='%b' -1 $fix | grep -qi '^Cc: *stable@dpdk.org' ||
		git log --format='\t%s' -1 $fix
done)
[ -z "$bad" ] || { printf "Is it candidate for Cc: stable@dpdk.org backport?\n$bad\n"\
	&& failure=true;}

total=$(echo "$commits" | wc -l)
if $failure ; then
	printf "\nInvalid patch(es) found - checked $total patch"
else
	printf "\n$total/$total valid patch"
fi
[ $total -le 1 ] || printf 'es'
printf '\n'
$failure && exit 1 || exit 0