Drop the rebuild feature of lfc

bin/lfc

@@ -18,6 +18,7 @@ jarpath="${lfbase}build/libs/org.lflang.lfc-0.1.0-SNAPSHOT-all.jar"
 # Report fatal error.
 function fatal_error() {
     1>&2 echo -e "\e[1mlfc: \e[31mfatal error: \e[0m$1"
+    exit 1
 }
 
 pushd () {
@@ -28,8 +29,24 @@ popd () {
     command popd "$@" > /dev/null
 }
 
-# Build first if no jar exists.
-if [[ ! -f "$jarpath" ]]; then
+# 1. Determine whether to rebuild; and
+# 2. Strip rebuild flag from args.
+rebuild=false
+args=()
+for var in "$@"; do
+    if [[ $var =~ "-r" ]]; then
+        rebuild=true
+    else
+        args+=("$var")
+    fi
+done
+
+# Build if no jar exists or rebuild is requested.
+if [[ ! -f "$jarpath" || "$rebuild" = true ]]; then
+    # Throw error if no sources are available
+    if [[ ! -d $lfbase ]]; then
+        fatal_error "Unable to (re)build from source. Exiting."
+    fi
     pushd "$base"
     ./gradlew buildLfc
     popd
@@ -43,7 +60,6 @@ elif [[ -n "$JAVA_HOME" ]] && [[ -x "$JAVA_HOME/bin/java" ]];  then
     _java="$JAVA_HOME/bin/java"
 else
     fatal_error "JRE not found."
-    error_exit
 fi
 
 if [[ "$_java" ]]; then
@@ -52,10 +68,9 @@ if [[ "$_java" ]]; then
     #echo version "$semantic_version"
     #echo version "$java_version"
     if [ $java_version -lt 011000 ]; then
-        fatal_error "JRE $semantic_version found but 1.11 or greater is required."     
-        error_exit
+        fatal_error "JRE $semantic_version found but 1.11 or greater is required."
     fi
 fi
 
-"${_java}" -jar "${jarpath}" "$@";
+"${_java}" -jar "${jarpath}" "${args[@]}";
 exit $?

org.lflang.lfc/build.gradle

@@ -28,11 +28,14 @@ task buildLfc() {
 buildLfc.finalizedBy shadowJar
 
 task runLfc(type: JavaExec) {
-    // Note: when you use --args, you need to escape cli flags which start with --
-    // For instance --args ' --help'
-    // Otherwise they're parsed as arguments to the Gradle CLI, not LFC.
-    description = "Build and run LFC, use --args to pass arguments"
+    // builds and runs lfc
+    // The working directory will be the root directory of the lingua franca project
+    // CLI arguments can be passed to lfc by using --args. Note that you need
+    // to escape cli flags which start with --.For instance --args ' --help'.
+    // Otherwise they're parsed as arguments to the Gradle CLI, not lfc.
+    description = "Build and run lfc, use --args to pass arguments"
     group = "application"
     classpath = sourceSets.main.runtimeClasspath
     mainClass = 'org.lflang.lfc.Main'
+    workingDir = '..'
 }