#!/usr/bin/env bash

SRC_DIR=$1

if [ ! -e "$SRC_DIR/lib-src/etags.c" ]
then
    echo "\`$SRC_DIR' is not top directory of emacs source code"
    exit 1
fi

pushd "$SRC_DIR"

for d in src lib-src lib
do
    pushd "$d"
    etags -o TAGS.sub *.[hc]
    INCLUDE_ETAGS_FILES="$INCLUDE_ETAGS_FILES --include $PWD/TAGS.sub"
    popd
done

for d in lisp
do
    pushd "$d"
    etags -o TAGS.sub *.el
    INCLUDE_ETAGS_FILES="$INCLUDE_ETAGS_FILES --include $PWD/TAGS.sub"
    for sub in *
    do
	if [ -d "$sub" ]
	then
	    pushd "$sub"
	    etags -o TAGS.sub *.el
	    INCLUDE_ETAGS_FILES="$INCLUDE_ETAGS_FILES --include $PWD/TAGS.sub"
	    popd
	fi
    done
    popd
done

if [ -n "$INCLUDE_ETAGS_FILES" ]
then
    etags $INCLUDE_ETAGS_FILES
fi

popd