Fix loop to be more accuratly timed, and added custom ruby libs inclusion setup

libs/l_mgems/compile.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+set -e
+
+SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+OUTPUT_TMP=$(mktemp)
+OUTPUT="$SCRIPT_DIR/../../include/binding/ruby_compiled.h"
+
+if test "$1" = "clean"; then
+  rm -f "$OUTPUT"
+  exit 0
+fi
+
+trap 'rm -f "$OUTPUT_TMP"' EXIT
+
+mapfile -t FILES < <(find "$SCRIPT_DIR" -name "*.rb" | sort)
+
+LATEST_FILE_TIME=$(for file in "${FILES[@]}"; do
+  echo $(stat -c "%Y" "$file")
+done | sort -n | tail -1)
+
+OUTPUT_TIME=$(stat -c "%Y" "$OUTPUT" 2>/dev/null || echo 0)
+
+if test "$OUTPUT_TIME" -ge "$LATEST_FILE_TIME"; then
+  echo "mgems is up to date."
+  exit 0
+fi
+
+"$SCRIPT_DIR/../mruby/bin/mrbc" -o "$OUTPUT_TMP" "${FILES[@]}"
+
+{
+  echo "#ifndef MGEMS_H"
+  echo "#define MGEMS_H"
+  xxd -i -n mgems $OUTPUT_TMP \
+     | sed -e 's/^unsigned char /constexpr unsigned char /' \
+           -e 's/^unsigned int /constexpr unsigned int /'
+  echo "#endif"
+} > "$OUTPUT"
+
+echo "Compiled mgems!"