diff --git a/Makefile b/Makefile
index 14ed2cf..7b76a03 100644
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,9 @@ build: clean
 run:
 	./bin/odin_runner.exe
 
+check:
+	odin check ./src/
+
 clean:
 	rm -rf ./bin/odin_runner.*
 
diff --git a/odin_runner.json b/odin_runner.json
index e5c4cf7..263a324 100644
--- a/odin_runner.json
+++ b/odin_runner.json
@@ -2,6 +2,7 @@
 	"defaults": {
 		"collections": [],
 		"flags": [],
+		"source": "./src/",
 		"output_dir": "./bin/",
 		"binary_name": "binary_name.bin"
 	},
@@ -17,6 +18,7 @@
 			"flags": [
 				"-o:speed",
 			],
+			"source": "./src/",
 			"output_dir": "./bin/release/",
 			"binary_name": "binary_name_release.bin"
 			}
@@ -32,6 +34,7 @@
 			"flags": [
 				"-debug",
 			],
+			"source": "./src/",
 			"output_dir": "./bin/debug/",
 			"binary_name": "binary_name_debug.bin"
 			}
diff --git a/src.bin b/src.bin
new file mode 100755
index 0000000..9885ffb
Binary files /dev/null and b/src.bin differ
diff --git a/src/argument_parser.odin b/src/argument_parser.odin
index f9f9ae5..ab79560 100644
--- a/src/argument_parser.odin
+++ b/src/argument_parser.odin
@@ -4,30 +4,51 @@ import "core:fmt"
 import "core:log"
 import "core:os"
 
-ECommand :: enum {
+Command :: enum {
+	TEST,
 	BUILD,
 	CHECK,
 	CLEAN,
 }
 
+TEST_CMD :: "test"
 BUILD_CMD :: "build"
 CHECK_CMD :: "check"
 CLEAN_CMD :: "clean"
 
-parse_commands :: proc() {
-	command : ECommand
+parse_commands :: proc() -> (command: Command, target: TargetName) {
 	args := os.args
 	binary_name := args[0]
-	command_string := args[1]
+	command_string := len(args) > 1 ? args[1] : "build"
 	log.infof("args: %v", args)
 
-	if command_string == BUILD_CMD {
+	if command_string == TEST_CMD {
+		command = .TEST
+	} else if command_string == BUILD_CMD {
 		command = .BUILD
-	}
-	if command_string == CHECK_CMD {
+	} else if command_string == CHECK_CMD {
 		command = .CHECK
-	}
-	if command_string == CLEAN_CMD {
+	} else if command_string == CLEAN_CMD {
 		command = .CLEAN
+	} else {log.errorf("Unsupported command: %s", command_string);os.exit(1)}
+
+	if len(args) > 2 {
+		target = TargetName(args[2])
 	}
+	return
+}
+
+command_to_string :: proc(command: Command) -> string {
+	switch command {
+	case .TEST:
+		{return "test"}
+	case .BUILD:
+		{return "build"}
+	case .CLEAN:
+		{return "clean"}
+	case .CHECK:
+		{return "check"}
+	}
+
+	return ""
 }
diff --git a/src/command_executor.odin b/src/command_executor.odin
new file mode 100644
index 0000000..7c9c3f9
--- /dev/null
+++ b/src/command_executor.odin
@@ -0,0 +1,80 @@
+package main
+
+import c "core:c/libc"
+import "core:log"
+import "core:os"
+import "core:strings"
+
+ExecutionError :: enum {
+	None,
+	ErrorDuringCommandExecution,
+}
+
+execute_command :: proc(
+	command: Command,
+	target_name: TargetName,
+	configuration: ConfigurationTargets,
+) -> (
+	error: ExecutionError,
+) {
+	target_config, found_target_in_config := configuration[target_name]
+	if !found_target_in_config && target_name != "" {
+		log.errorf("No such target in config: %s", target_name)
+		os.exit(1)
+	}
+
+	compile_flags: string
+	sb := strings.builder_make()
+	defer strings.builder_destroy(&sb)
+
+	// Append the command
+	strings.write_string(&sb, "odin ")
+	strings.write_string(&sb, command_to_string(command))
+	strings.write_byte(&sb, ' ')
+
+	if def_config, ok := configuration[DEFAULT_TARGET_NAME]; ok && !found_target_in_config {
+		strings.write_string(&sb, string(def_config.source))
+	} else if found_target_in_config {
+		strings.write_string(&sb, string(target_config.source))
+	}
+
+	// Add the collections to the compile flags
+	if def_config, ok := configuration[DEFAULT_TARGET_NAME]; ok {
+		for collectionName, collectionPath in def_config.collections {
+			strings.write_string(&sb, " -collection:")
+			strings.write_string(&sb, string(collectionName))
+			strings.write_string(&sb, "=")
+			strings.write_string(&sb, string(collectionPath))
+		}
+	}
+	if found_target_in_config {
+		for collectionName, collectionPath in target_config.collections {
+			strings.write_string(&sb, " -collection:")
+			strings.write_string(&sb, string(collectionName))
+			strings.write_string(&sb, "=")
+			strings.write_string(&sb, string(collectionPath))
+		}
+	}
+
+	// Add the other type of flags
+	if def_config, ok := configuration[DEFAULT_TARGET_NAME]; ok {
+		for flag in def_config.flags {
+			strings.write_byte(&sb, ' ')
+			strings.write_string(&sb, flag)
+		}
+	}
+	if found_target_in_config {
+		for flag in target_config.flags {
+			strings.write_byte(&sb, ' ')
+			strings.write_string(&sb, flag)
+		}
+	}
+
+	compile_flags = strings.to_string(sb)
+
+	log.infof("Calling command:\n\t'%s'", compile_flags)
+	ccommand, err := strings.clone_to_cstring(compile_flags)
+	c.system(ccommand)
+
+	return
+}
diff --git a/src/config_parser.odin b/src/config_parser.odin
index 38fbebe..e562eec 100644
--- a/src/config_parser.odin
+++ b/src/config_parser.odin
@@ -13,6 +13,7 @@ TargetName :: distinct string
 DEFAULT_TARGET_NAME :: "defaults"
 CONFIGURATIONS_KEY :: "configurations"
 FLAGS_KEY :: "flags"
+SOURCE_KEY :: "source"
 OUTPUT_DIR_KEY :: "output_dir"
 BINARY_NAME_KEY :: "binary_name"
 COLLECTION_NAME_KEY :: "name"
@@ -26,6 +27,7 @@ Config :: struct {
 	output_dir:         Path,
 	binary_name:        string,
 	configuration_name: TargetName,
+	source: Path,
 }
 
 ConfigurationTargets :: distinct map[TargetName]Config
@@ -104,6 +106,9 @@ parse_target_config :: proc(name: TargetName, target_obj: json.Object) -> (confi
 		}
 	}
 
+	source, s_ok := target_obj[SOURCE_KEY].(json.String)
+	if s_ok {config.source = Path(source)}
+
 	output_dir, o_ok := target_obj[OUTPUT_DIR_KEY].(json.String)
 	if o_ok {config.output_dir = Path(output_dir)}
 
diff --git a/src/main.odin b/src/main.odin
index e6d144b..56df7f2 100644
--- a/src/main.odin
+++ b/src/main.odin
@@ -1,11 +1,13 @@
 package main
 
 import "core:log"
+import c "core:c/libc"
 
 main :: proc() {
 	context.logger = log.create_console_logger()
 
-	parse_commands()
+	command, target := parse_commands()
 	targets := parse_config("./odin_runner.json")
 	log.debug(targets)
+	execute_command(command, target, targets)
 }