#!/bin/sh
# xlint TEMPLATE - scan XBPS template for common mistakes

export LC_ALL=C

scan() {
	local rx="$1" msg="$2"
	grep -P -Hn -e "$rx" "$template" |
		sed "s/^\([^:]*:[^:]*:\)\(.*\)/\1 $msg/"
}

once() {
	head -n 1
}

header() {
	if [ "$(head -n1 "$template")" != "# Template file for '$pkgname'" ]; then
		echo "$template:1: Header should be: # Template file for '$pkgname'"
	fi
}

exists_once() {
	for var in pkgname version revision short_desc maintainer license \
		   homepage; do
		case "$(grep -c "^${var}=" "$template")" in
			0) echo "$template: '$var' missing!";;
			1) ;;
			*) echo "$template: '$var' defined more than once";;
		esac
	done
}

variables_order() {
	local curr_index max_index max_index_line variables_end message line
	max_index=0
	while IFS="" read -r line; do
		case "$line" in
			pkgname=*) curr_index=1;;
			reverts=*) curr_index=2;;
			version=*) curr_index=3;;
			revision=*) curr_index=4;;
			archs=*) curr_index=5;;
			wrksrc=*) curr_index=7;;
			create_wrksrc=*) curr_index=8;;
			build_wrksrc=*) curr_index=9;;
			only_for_archs=*) continue;;
			build_style=*) curr_index=11;;
			build_helper=*) curr_index=11;;
			cmake_args=*) curr_index=12;;
			cmake_builddir=*) curr_index=12;;
			configure_args=*) curr_index=12;;
			configure_script=*) curr_index=12;;
			go_build_tags=*) curr_index=12;;
			go_get=*) curr_index=12;;
			go_import_path=*) curr_index=12;;
			go_ldflags=*) curr_index=12;;
			go_package=*) curr_index=12;;
			go_mod_mode=*) curr_index=12;;
			make_build_args=*) curr_index=12;;
			make_build_target=*) curr_index=12;;
			make_check_args=*) curr_index=12;;
			make_check_target=*) curr_index=12;;
			make_cmd=*) curr_index=12;;
			make_install_args=*) curr_index=12;;
			make_install_target=*) curr_index=12;;
			make_use_env=*) curr_index=12;;
			meson_builddir=*) curr_index=12;;
			meson_cmd=*) curr_index=12;;
			meson_crossfile=*) curr_index=12;;
			perl_configure_dirs=*) curr_index=12;;
			pycompile_dirs=*) curr_index=12;;
			pycompile_module=*) curr_index=12;;
			python_versions=*) curr_index=12;;
			stackage=*) curr_index=12;;
			conf_files=*) continue;;
			make_dirs=*) continue;;
			hostmakedepends=*) curr_index=15;;
			makedepends=*) curr_index=16;;
			depends=*) curr_index=17;;
			checkdepends=*) curr_index=18;;
			short_desc=*) curr_index=19;;
			maintainer=*) curr_index=20;;
			license=*) curr_index=21;;
			homepage=*) curr_index=22;;
			changelog=*) curr_index=23;;
			distfiles=*) curr_index=24;;
			checksum=*) curr_index=25;;
			alternatives=*) curr_index=26;;
			fetch_cmd=*) curr_index=26;;
			bootstrap=*) continue;;
			"#"*) continue;;
			" "*) continue;;
			"	"*) continue;;
			"_"*"="*) continue;;
			*"="*) curr_index=27;;
			"") variables_end=1;;
			*"{") variables_end=1;;
			*) continue;;
		esac

		if [ "$variables_end" ]; then
			break
		elif [ "$curr_index" -lt "$max_index" ]; then
			message="$template: Place $max_index_line= after ${line%%=*}="
		elif [ "$curr_index" -gt "$max_index" ]; then
			max_index="$curr_index"
			max_index_line="${line%%=*}"
			if [ "$message" ]; then
				echo "$message"
				message=
			fi
		fi
	done < "$template"
	[ "$message" ] && echo "$message"
}

file_end() {
	if [ "$(tail -c 1 $template)" ]; then
		echo "$template:$(( $(wc -l < $template) + 1 )): File does not end with newline character"
	elif [ -z "$(tail -c 2 $template)" ]; then
		echo "$template:$(wc -l < $template): Last line is empty"
	fi
}

variables=$(echo -n "#.*
_.*
.*_descr
.*_groups
.*_homedir
.*_pgroup
.*_shell
desc_option_.*
AR
AS
CC
CFLAGS
CPP
CPPFLAGS
CXX
CXXFLAGS
GCC
LD
LDFLAGS
LD_LIBRARY_PATH
NM
OBJCOPY
OBJDUMP
RANLIB
READELF
STRIP
XBPS_FETCH_CMD
allow_unknown_shlibs
alternatives
archs
binfmts
bootstrap
broken
build_options
build_options_default
build_style
build_helper
build_wrksrc
changelog
checkdepends
checksum
cmake_builddir
conf_files
configure_args
configure_script
conflicts
create_wrksrc
depends
disable_parallel_build
distfiles
dkms_modules
fetch_cmd
font_dirs
force_debug_pkgs
go_build_tags
go_get
go_import_path
go_ldflags
go_package
go_mod_mode
homepage
hostmakedepends
keep_libtool_archives
kernel_hooks_version
lib32depends
lib32disabled
lib32files
lib32mode
lib32symlinks
license
maintainer
make_build_args
make_build_target
make_check_args
make_check_target
make_cmd
make_dirs
make_install_args
make_install_target
make_use_env
makedepends
mutable_files
nocross
nodebug
nopie
noshlibprovides
nostrip
nostrip_files
noverifyrdeps
only_for_archs
patch_args
pkgname
preserve
provides
pycompile_dirs
pycompile_module
pycompile_version
python_version
register_shell
replaces
repository
restricted
reverts
revision
run_depends
sgml_catalogs
sgml_entries
shlib_provides
shlib_requires
short_desc
skip_extraction
skiprdeps
stackage
subpackages
system_accounts
system_groups
tags
triggers
version
wrksrc
xml_catalogs
xml_entries" | tr '\n' '|')

ret=0
for template; do
	if [ -f "$template" ]; then
	exists_once "$template"
	scan 'short_desc=.*\."' "unwanted trailing dot in short_desc"
	scan 'short_desc=["'\''][a-z]' "short_desc should start uppercase"
	scan 'short_desc=["'\''](An?|The) ' "short_desc should not start with an article"
	scan 'short_desc=["'\''][\t ]' "short_desc should not start with whitespace"
	scan 'short_desc=["'\''].{73}' "short_desc should be less than 72 chars"
	scan 'license=.*[^NL]GPL[^-]' "license GPL without version"
	scan 'license=.*SSPL' "Uses the SSPL license, which is not packageable"
	scan 'license=.*LGPL[^-]' "license LGPL without version"
	if ! grep -q vlicense "$template"; then
		for l in custom AGPL MIT BSD ISC; do
			scan "license=.*$l" "license '$l', but no use of vlicense"
		done
	else
		if ! grep license= "$template" | grep -Pqv -e 'license="(\b(LGPL|GPL|GFDL|Apache)-\S+(, )?)+"'; then
			scan "vlicense" 'license '"$(grep -Po license='\K.+' "$template" | tr -d '",' | tr '\n' ' ')"'should not be installed' | once
		fi
	fi

	: "${LICENSE_LIST:=/usr/share/spdx/license.lst}"
	if [ -f "${LICENSE_LIST}" ]; then
		sed -n 's/license="\(.*\)"/\1/p' "$template" | tr , "\n" | while read -r l; do
			case "$l" in
				custom:*|'Public Domain') continue ;;
			esac

			if ! grep -q "^${l}$" "${LICENSE_LIST}"; then
				scan "license=.*$l" "use SPDX id for '$l' license or see Manual.md"
			fi
		done
	fi

	if ! sed -n '/^version=/{n;/revision=/b;q1}' "$template"; then
		scan 'revision=' "revision does not appear immediately after version"
	fi
	scan 'vinstall.* 0?755.*usr/bin' "use vbin"
	scan 'vinstall.* usr/share/man' "use vman"
	scan 'vinstall.* usr/share/licenses' "use vlicense"
	scan '^  ' "indent with tabs" | once
	scan '[\t ]$' "trailing whitespace"
	scan '[^\\]`' "use \$() instead of backticks"
	scan '^pkgname="[^$]+"' "pkgname must not be quoted"
	scan 'revision=0' "revision must not be zero"
	scan '^version=.*[:-].*' "version must not contain the characters : or -"
	scan '^version=.*\${.*[:!#%/^,@].*}.*' "version must not use shell variable substitution mechanism"
	scan '^version="[^$]+"' "version must not be quoted"
	scan '^reverts=.*-.*' "reverts must not contain package name"
	scan '^reverts=(?!.*_.*).*' "reverts without revision"
	scan 'replaces=(?=.*\w)[^<>]*$' "replaces needs depname with version"
	scan 'maintainer=(?!.*<.*@.*>).*' "maintainer needs email address"
	scan 'maintainer=.*<.*@users.noreply.github.com>.*' "maintainer needs a valid address for sending mail"
	scan 'nonfree=' "use repository=nonfree"
	scan '^(?!\s*('"$variables"'))[^\s=-]+=' \
		"custom variables should use _ prefix: \2"
	scan '^[^ =]*=(""|''|)$' "variable set to empty string: \2"
	scan '^(.*)-docs_package().*' 'use <pkgname>-doc subpackage for documentation'
	scan 'distfiles=.*github.com.*/archive/.*\.zip[\"]?$' 'Use the distfile .tar.gz instead of .zip'
	scan 'distfiles=.*downloads\.sourceforge\.net' 'use $SOURCEFORGE_SITE'
	scan 'distfiles=.*savannah.nongnu\.org' 'use $NONGNU_SITE'
	scan 'distfiles=.*archive\.ubuntu\.com' 'use $UBUNTU_SITE'
	scan 'distfiles=.*x\.org/releases/individual' 'use $XORG_SITE'
	scan 'distfiles=.*ftp.*debian\.org' 'use $DEBIAN_SITE'
	scan 'distfiles=.*gnome\.org/pub' 'use $GNOME_SITE'
	scan 'distfiles=.*www\.kernel\.org/pub/linux' 'use $KERNEL_SITE'
	scan 'distfiles=.*cpan\.org/modules/by-module' 'use $CPAN_SITE'
	scan 'distfiles=.*files\.pythonhosted\.org/packages' 'use $PYPI_SITE'
	scan 'distfiles=.*ftp\.mozilla\.org' 'use $MOZILLA_SITE'
	scan 'distfiles=.*ftp\.gnu\.org/(pub/)?gnu' 'use $GNU_SITE'
	scan 'distfiles=.*freedesktop\.org/software' 'use $FREEDESKTOP_SITE'
	scan 'distfiles=.*download.kde.org/stable' 'use $KDE_SITE'
	scan 'distfiles=.*xorg\.freedesktop\.org/wiki/' 'use $XORG_HOME'
	scan 'usr/lib/python3.[0-9]/site-packages' 'use $py3_sitelib'
	scan '^wrksrc=(\$\{[^}]+\}|[^${}/])*/.+' 'wrksrc should be a top-level directory'
	scan '^\t*function\b' 'do not use the function keyword'
	scan '^\t*[^ ]*  *\(\)' 'do not use space before function parenthesis'
	scan '^\t*[^ ]*\(\)(|   *){' 'use one space after function parenthesis'
	scan '^\t*[^ ]*\(\)$' 'do not use a newline before function opening brace'
	pkgname=$(grep -Po "^pkgname=\K.*" "$template")
	version=$(grep -Po "^version=\K.*" "$template")
	scan "distfiles=.*\Q$version\E" 'use ${version} in distfiles instead'
	variables_order
	header
	file_end
	else
	echo no such template "$template" 1>&2
	fi | sort -t: -n -k2 | grep . && ret=1
done
exit $ret