build.sh add help [skip ci]

build.sh

@@ -1,39 +1,60 @@
 #!/bin/bash
 
-CC=gcc
-CXX=g++
-
-n=0
-args=()
-for i in "$@"
-do
-case $i in
-	-j=*|--jobs=*)
-		jobs="-j${i#*=}"
-		shift
-	;;
-	-c=*|--compiler=*)
-		C="${i#*=}"
-		shift
-	;;
-	*)
-	args[$n]="$i"
-	((++n))
-	;;
-esac
-done
-
-case "$C" in
-	("intel"|"icc")	CC=icc CXX=icpc ;;
-	("gcc"|"g++")	CC=gcc CXX=g++ ;;
-	("clang|llvm")	CC=clang CXX=clang++ ;;
-	*)
-	;;
-esac
-
-rm -rf build
-mkdir build
-pushd build &> /dev/null
-CC=$CC CXX=$CXX cmake ${args[@]} ..
-make ${jobs}
-popd > /dev/null
+main()
+{
+	CC=gcc
+	CXX=g++
+
+	if [[ "$*" =~ "--help" ]]; then
+		help
+		exit 0;
+	fi
+
+	n=0
+	args=()
+	for i in "$@"
+	do
+	case $i in
+		-j=*|--jobs=*)
+			jobs="-j${i#*=}"
+			shift
+		;;
+		-c=*|--compiler=*)
+			C="${i#*=}"
+			shift
+		;;
+		*)
+		args[$n]="$i"
+		((++n))
+		;;
+	esac
+	done
+
+	case "$C" in
+		("intel"|"icc")	CC=icc CXX=icpc ;;
+		("gcc"|"g++")	CC=gcc CXX=g++ ;;
+		("clang|llvm")	CC=clang CXX=clang++ ;;
+		*)
+		;;
+	esac
+
+	rm -rf build
+	mkdir build
+	pushd build &> /dev/null
+	CC=$CC CXX=$CXX cmake ${args[@]} ..
+	make ${jobs}
+	popd > /dev/null
+}
+
+help()
+{
+	printf "Usage: ./build.sh <options>\n\n"
+	printf "  -c= | --compiler=<icc|gcc|clang> - Select preferred C/C++ compiler to build\n"
+	printf "  -j= | --jobs=<N>                 - Specifies the number of jobs (commands) to run simultaneously (For faster building)\n\n"
+}
+
+# Initialize
+main $*
+
+# Exit normally
+exit 0