Add "packer.sh" script to merge lots fo file into a single one.

src/packer.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+#
+# written by Arthur Furlan <afurlan@mecasar.com>
+
+if [ $# -lt 3 ]; then
+    echo "Usage: $0 BASEDIR PACKAGE FILE1 FILE2 FILE3 ..."
+    exit 1
+fi
+
+## compare the modified date of two files
+is_file_modified() {
+    [ $# -lt 2 ] && return 0
+
+    ## check if both files already exist
+    [ -f "${1}" ] || return 0
+    [ -f "${2}" ] || return 1
+
+    ## get the modified date of both files
+    MOD1=$(stat "${1}" | grep ^Modify: | cut -c 9-27)
+    MOD2=$(stat "${2}" | grep ^Modify: | cut -c 9-27)
+
+    if [ "$MOD1" \> "$MOD2" ]; then
+        return 1
+    else
+        return 0
+    fi
+}
+
+## pack all modified files under $BASEDIR in the file $PACKAGE
+BASEDIR=$1
+PACKAGE=$2
+shift 2
+
+## check if there is a modified file, if so package needs to be rebuilt
+MODIFIED=0
+cd $BASEDIR
+for FILE in $*; do
+
+    ## check if the file was modified after $PACKAGE creation
+    is_file_modified "$BASEDIR/$FILE" "$BASEDIR/$PACKAGE"
+    if [ "$?" = "1" ]; then
+        MODIFIED=1
+        break
+    fi
+done
+
+## if there is a modified file, rebuild the $PACKAGE file
+if [ "$MODIFIED" = "1" ]; then
+    cat $* > $PACKAGE
+fi