epm-autoremove: rewrite help, add python2 and python3 separately

bin/epm-autoremove

@@ -128,6 +128,8 @@ __epm_autoremove_altrpm_lib()
 }
 
 
+epm_autoremove_default_groups="python2 python3 perl libs"
+
 __epm_autoremove_altrpm()
 {
 	local i
@@ -135,9 +137,7 @@ __epm_autoremove_altrpm()
 	assure_exists /usr/share/apt/scripts/list-nodeps.lua apt-scripts
 
 	if [ -z "$pkg_names" ] ; then
-		__epm_autoremove_altrpm_pp '^(python-module-|python3-module-|python-modules-|python3-modules|perl-)'
-		__epm_autoremove_altrpm_lib nodevel
-		return 0
+		pkg_names="$epm_autoremove_default_groups"
 	fi
 
 	for i in $pkg_names ; do
@@ -161,7 +161,7 @@ __epm_autoremove_altrpm()
 			__epm_autoremove_altrpm_lib
 			;;
 		*)
-			fatal "autoremove: unsupported '$i'. Use libs, python, python2, python3, perl, libs-devel."
+			fatal "autoremove: unsupported '$i'. Use epm autoremove --help to list supported ones"
 			;;
 		esac
 	done
@@ -169,19 +169,41 @@ __epm_autoremove_altrpm()
 	return 0
 }
 
+epm_autoremove_print_help()
+{
+	echo "epm autoremove removes unneeded packages from the system"
+	echo "run 'epm autoremove' to use apt-get autoremove"
+	echo "or run 'epm autoremove --direct [group1] [group2] ...' to use epm implementation"
+	echo "Default groups: $epm_autoremove_default_groups"
+	cat <<EOF
+Supported package groups:
+    libs       - unused libraries
+    libs-devel - unused -devel packages
+    python     - all python modules
+    python2    - python2 modules
+    python3    - python3 modules
+    perl       - perl- modules
+EOF
+}
+
+
 # TODO: keep our eepm package
 epm_autoremove()
 {
 
 case $DISTRNAME in
 	ALTLinux)
+		if [ "$1" = "-h" ] || [ "$1" = "--help" ] || [ "$1" = "help" ] ; then
+			epm_autoremove_print_help
+			return 0
+		fi
 		if [ -z "$direct" ] ; then
 			sudocmd apt-get $(subst_option non_interactive -y) autoremove $dryrun
 			local RET=$?
-			info "Also you can run 'epm autoremove --direct' to use low level autoremove (epm internal implementation)"
+			info "Also you can run 'epm autoremove --direct' to use epm implementation of autoremove (see --help)"
 			[ "$RET" = 0 ] || return
 		else
-			__epm_autoremove_altrpm
+			__epm_autoremove_altrpm "$@"
 		fi
 
 		[ -n "$dryrun" ] && return