Modified function file downloader

Modified from @jaredballou pull request.  Now uses curl as it better
handles errors.

Can now select different repo and branch if needed. This is very useful
for development.

TeamFortress2/tf2server

@@ -3,7 +3,7 @@
 # Server Management Script
 # Author: Daniel Gibbs
 # Website: http://gameservermanagers.com
-version="091215"
+version="121215"
 
 #### Variables ####
 
@@ -37,6 +37,13 @@ parms="-game tf -strictportbind -ip ${ip} -port ${port} +clientport ${clientport
 
 #### Advanced Variables ####
 
+# Github Branch Select
+# Allows for the use of different function files
+# from a different repo and/or branch.
+githubuser="dgibbs64"
+githubrepo="linuxgsm"
+githubbranch="master"
+
 # Steam
 appid="232250"
 
@@ -75,20 +82,46 @@ consolelogdate="${consolelogdir}/${servicename}-console-$(date '+%d-%m-%Y-%H-%M-
 ##### Script #####
 # Do not edit
 
-fn_runfunction(){
-# Functions are downloaded and run with this function
-if [ ! -f "${rootdir}/functions/${functionfile}" ]; then
-	cd "${rootdir}"
-	if [ ! -d "functions" ]; then
-		mkdir functions
+fn_getgithubfile(){
+filename=$1
+exec=$2
+fileurl=${3:-$filename}
+filepath="${rootdir}/${filename}"
+filedir=$(dirname "${filepath}")
+# If the function file is missing, then download
+if [ ! -f "${filepath}" ]; then
+	if [ ! -d "${filedir}" ]; then
+		mkdir "${filedir}"
+	fi
+	githuburl="https://raw.githubusercontent.com/${githubuser}/${githubrepo}/${githubbranch}/${fileurl}"
+	echo -e "    fetching ${filename}...\c"
+	#wget -N /dev/null "${githuburl}" -O "${filepath}" 2>&1 | grep -F HTTP | cut -c45-
+    if [ "$(command -v curl)" ]||[ "$(which curl >/dev/null 2>&1)" ]||[ -f "/usr/bin/curl" ]||[ -f "/bin/curl" ]; then
+    	echo -e "\e[0;31mFAIL\e[0m\n"
+		echo "Curl is not installed"
+		echo -e ""
+		exit    	
+    fi	
+    CURL=$(curl --fail -o "${filepath}" "${githuburl}" 2>&1)
+	if [ $? -ne 0 ]; then
+		echo -e "\e[0;31mFAIL\e[0m\n"
+		echo "		$CURL"|grep "curl:"
+		echo -e "${githuburl}\n"
+		exit
+	else
+		echo -e "\e[0;32mOK\e[0m"
+	fi	
+	if [ "$exec" ]; then
+		chmod +x "${filepath}"
 	fi
-	cd functions
-	echo -e "    loading ${functionfile}...\c"
-	wget -N /dev/null https://raw.githubusercontent.com/dgibbs64/linuxgsm/master/functions/${functionfile} 2>&1 | grep -F HTTP | cut -c45-
-	chmod +x "${functionfile}"
-	cd "${rootdir}"
 fi
-source "${rootdir}/functions/${functionfile}"
+if [ "$exec" ]; then
+	source "${filepath}"
+fi
+}
+
+fn_runfunction(){
+	fn_getgithubfile "functions/${functionfile}" 1
 }
 
 fn_functions(){