#!/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
}

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
allow_unknown_shlibs
alternatives
binfmts
bootstrap
broken
build_options
build_options_default
build_style
build_wrksrc
checksum
cmake_builddir
conf_files
configure_args
configure_script
conflicts
create_wrksrc
depends
depends
disable_parallel_build
distfiles
dkms_modules
font_dirs
force_debug_pkgs
go_build_tags
go_import_path
go_package
go_ldflags
homepage
hostmakedepends
keep_libtool_archives
kernel_hooks_version
lib32depends
lib32disabled
lib32files
lib32mode
lib32symlinks
license
maintainer
make_build_args
make_build_target
make_cmd
make_dirs
make_install_args
make_install_target
makedepends
mutable_files
noarch
nocross
nodebug
nopie
noshlibprovides
nostrip
nostrip_files
noverifyrdeps
only_for_archs
patch_args
pkgname
preserve
provides
pycompile_dirs
pycompile_module
pycompile_version
python_versions
register_shell
replaces
repository
restricted
reverts
revision
run_depends
sgml_catalogs
sgml_entries
shlib_provides
shlib_requires
short_desc
skip_extraction
stackage
subpackages
system_accounts
system_groups
systemd_services
tags
triggers
version
wrksrc
xml_catalogs
xml_entries" | tr '\n' '|')

ret=0
for template; do
	if [ -f "$template" ]; then
	scan 'short_desc=.*\."' "unwanted trailing dot in short_desc"
	scan 'short_desc=["'\''][a-z]' "short_desc should start uppercase"
	scan 'short_desc=["'\''][\t ]' "short_desc should not start with whitespace"
	scan 'short_desc=["'\''].{73}' "short_desc should be less than 72 chars"
	scan 'license=.*[^L]GPL[^-]' "license GPL without version"
	scan 'license=.*LGPL[^-]' "license LGPL without version"
	if ! grep -q vlicense "$template"; then
		for l in custom MIT BSD ISC; do
			scan "license=.*$l" "license '$l', but no use of vlicense"
		done
	fi
	if ! sed -n '/^version=/{n;/revision=/b;q1}' "$template"; then
		scan 'revision=' "revision does not appear immediately after version"
	fi
	scan 'vinstall.* usr/bin' "use vbin"
	scan 'vinstall.* usr/share/man' "use vman"
	scan 'vinstall.* usr/share/licenses' "use vlicense"
	scan '^  ' "indent with tabs" | once
	scan '[\t ]$' "trailing whitespace"
	scan '[^\\]`' "use \$() instead of backticks"
	scan 'revision=0' "revision must not be zero"
	scan '^version=.*[:-].*' "version must not contain the characters : or -"
	scan 'replaces=(?=.*\w)[^<>]*$' "replaces needs depname with version"
	scan 'maintainer=(?!.*<.*@.*>).*' "maintainer needs email address"
	scan 'nonfree=' "use repository=nonfree"
	scan '^(?!\s*('"$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=.*sourceforge\.net' 'use $SOURCEFORGE_SITE'
	scan 'distfiles=.*savannah.nongnu\.org' 'use $NONGNU_SITE'
	scan 'distfiles=.*archive\.ubuntu\.com' 'use $UBUNTU_SITE'
	scan 'distfiles=.*xorg\.freedesktop\.org' '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=.*pypi\.python\.org' '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 $FREEDESKTOP_SITE'
	scan '^wrksrc=(\$\{[^}]+\}|[^${}/])*/.+' '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*[^ ]*\(\)$' 'do not use a newline before function opening brace'
	else
	echo no such template "$template" 1>&2
	fi | sort -t: -n -k2 | grep . && ret=1
done
exit $ret