diff --git a/build.sh b/build.sh
index 95b220c..84684cd 100755
--- a/build.sh
+++ b/build.sh
@@ -1,11 +1,77 @@
 #!/bin/bash
 
-fswatch -r src -i '*.ly$' -e "includes" | while read FILE; do
-    BASE_NAME=$(basename -s .ly $FILE)
-    DIR_NAME=$(dirname $FILE | sed "s@$PWD/src/@@")
+# Helper Functions #####################################################################################################
+
+function cancel {
+    # TODO(aminer): implement
+    exit 0
+}
+
+function compile-ly {
+    BASE_NAME=$(basename -s .ly $1)
+    DIR_NAME=$(dirname $1 | sed "s@./src/@@" | sed "s@$PWD/src/@@")
 
     mkdir -p "dist/$DIR_NAME"
-    lilypond -I "$PWD/src/includes" -o "dist/$DIR_NAME/$BASE_NAME" $FILE
-    open -a "/Applications/Google Chrome.app" -g "dist/$DIR_NAME/$BASE_NAME.pdf"
+    lilypond -I "$PWD/src/includes" -o "dist/$DIR_NAME/$BASE_NAME" $1
+    
+    if [[ "$VIEW" == "YES" ]]; then
+        open -a "/Applications/Google Chrome.app" -g "dist/$DIR_NAME/$BASE_NAME.pdf"
+    fi
+}
+
+function usage {
+    # TODO(aminer): implement
+    exit 0
+}
+
+# Command Functions ####################################################################################################
+
+function command-clean {
+    rm -rf dist 2>/dev/null
+}
+
+function command-compile {
+    [[ ${#PATTERNS[*]} == 0 ]] && PATTERNS=(".*")
+    
+    while true; do
+        PATTERN=${PATTERNS[0]}
+        [[ "$PATTERN" == "" ]] && break
+        PATTERNS=(${PATTERNS[@]:1})
+        
+        find . -name "*.ly" | grep -v includes | grep "$PATTERN" | while read FILE; do
+            compile-ly $FILE
+        done
+    done
+}
+
+function command-watch {
+    fswatch -r src -i '*.ly$' -e "includes" | while read FILE; do
+        compile-ly $FILE
+    done
+}
+
+# Initialization #######################################################################################################
+
+COMMAND="$1"
+shift
+
+[[ "$COMMAND" == "" ]] && COMMAND="compile"
+
+PATTERNS=()
+VIEW="NO"
+
+while [[ "$1" != "" ]]; do
+    case "$1" in
+        -v|--view) VIEW="YES";;
+        *) PATTERNS+=($1);;
+    esac
+    shift
 done
 
+case "$COMMAND" in
+    -h|--help|help) usage;;
+    clean) command-clean;;
+    compile) command-compile;;
+    watch) command-watch;;
+    *) cancel "Unrecognized command: $COMMAND"
+esac