chore: added a script to fetch and arrange files from origin lua repo

Author: thiago-rezende

fetch_origin.sh

@@ -0,0 +1,104 @@
+#!/usr/bin/env bash
+
+PROGNAME=${0##*/}
+VERSION="0.1"
+
+origin=https://github.com/lua/lua
+branch=master
+dir=origin
+
+fetch_origin() {
+    git clone --depth 1 ${origin} ${dir}
+    mkdir ${dir}/src ${dir}/include
+    mv ${dir}/*.h include/.
+    mv ${dir}/*.c src/.
+
+    return
+}
+
+clean_up() { # Perform pre-exit housekeeping
+    rm -rf ${dir}
+    return
+}
+
+error_exit() {
+    echo -e "${PROGNAME}: ${1:-"Unknown Error"}" >&2
+    clean_up
+    exit 1
+}
+
+graceful_exit() {
+    clean_up
+    exit
+}
+
+signal_exit() { # Handle trapped signals
+    case $1 in
+    INT)
+        error_exit "Program interrupted by user"
+        ;;
+    TERM)
+        echo -e "\n$PROGNAME: Program terminated" >&2
+        graceful_exit
+        ;;
+    *)
+        error_exit "$PROGNAME: Terminating on unknown signal"
+        ;;
+    esac
+}
+
+usage() {
+    echo -e "Usage: $PROGNAME [-h|--help] [-o|--origin] [-b|--branch]"
+}
+
+help_message() {
+    cat <<-_EOF_
+		  $PROGNAME ver. $VERSION
+
+		  Fetch from lua origin and auto arrange files
+
+		  $(usage)
+
+		  Options:
+		  -h, --help  Display this help message and exit.
+		  -o, --origin  Origin to fetch
+		  -b, --branch  Branch to fetch
+
+	_EOF_
+    return
+}
+
+# Trap signals
+trap "signal_exit TERM" TERM HUP
+trap "signal_exit INT" INT
+
+# Parse command-line
+while [[ -n $1 ]]; do
+    case $1 in
+    -h | --help)
+        help_message
+        graceful_exit
+        ;;
+    -o | --origin)
+        origin=$2
+        echo "Fetch from $origin"
+        ;;
+    -b | --branch)
+        branch=$2
+        echo "On branch $branch"
+        ;;
+    -* | --*)
+        usage
+        error_exit "Unknown option $1"
+        ;;
+    *) ;;
+
+    esac
+    shift
+done
+
+# Main logic
+
+fetch_origin
+
+graceful_exit