Implement some new functions

libraries/common

@@ -63,6 +63,32 @@ function loadLibraries() {
 	source ${EZROOT}/libraries/colors &> /dev/null || panic
 }
 
+#-------------------------------------------------------------------------------
+# Saves specified message into a log file
+# Parameters: %message% %level%
+#-------------------------------------------------------------------------------
+function logMessage() {
+	if isEnabled ${LOGGING}; then
+		MESSAGE="${1}"
+		TYPE="${2}"
+		DATE=$(date +"${LOGDATEFORMAT}")
+		if [ -z ${TYPE} ]; then
+			TYPE="  -  "
+		fi
+		echo -e "[${DATE}][${TYPE}] ${MESSAGE}" >> ${LOGFILE}
+	fi
+}
+
+#-------------------------------------------------------------------------------
+# Saves executed command multiline output into a log file
+# Parameters: %command_output%
+#-------------------------------------------------------------------------------
+function logOutput() {
+	if isEnabled ${LOGGING}; then
+		echo -e "${@}" | awk '{ print "   )> ", $0; }' >> ${LOGFILE}
+	fi
+}
+
 #-------------------------------------------------------------------------------
 # Outputs error message and aborts program execution
 #-------------------------------------------------------------------------------
@@ -72,6 +98,46 @@ function panic() {
 	exit 1
 }
 
+#-------------------------------------------------------------------------------
+# Outputs formatted error message to both display and log file
+# Parameters: %message%
+#-------------------------------------------------------------------------------
+function printError() {
+	logMessage "${1}" "ERROR"
+	echo -e " ${MESSAGE_ERROR} ${@}"
+}
+
+#-------------------------------------------------------------------------------
+# Outputs formatted information to both display and log file
+# Parameters: %message%
+#-------------------------------------------------------------------------------
+function printInfo() {
+	logMessage "${1}" "INFO"
+	echo -e " ${MESSAGE_INFO} ${@}"
+}
+
+#-------------------------------------------------------------------------------
+# Outputs formatted warning to both display and log file
+# Parameters: %message%
+#-------------------------------------------------------------------------------
+function printWarn() {
+	logMessage "${1}" "WARN"
+	echo -e " ${MESSAGE_WARN} ${@}"
+}
+
+#-------------------------------------------------------------------------------
+# Silently executes given command and saves its output to log file if enabled
+# Parameters: %command%
+#-------------------------------------------------------------------------------
+function run() {
+	COMMAND="${1}"
+	logMessage "Executing: \"${COMMAND}\"" "DEBUG"
+	OUTPUT=$(${COMMAND} 2>&1)
+	RESULT=${?}
+	logOutput "${OUTPUT}"
+	return ${RESULT}
+}
+
 #-------------------------------------------------------------------------------
 # Returns a UNIX timestamp
 #-------------------------------------------------------------------------------