Allow specifying commands and verbose as flags

README.md

@@ -60,6 +60,32 @@ snag
 
 From a project with a `.snag.yml` file and develop away!
 
+### Quick Use
+
+If you find yourself working on a project that does not contain a snag file and
+still want to use snag, you can use flags to specify commands to run.
+
+The `-c` flag allows specifying a command just like the snag file and can
+be defined more than once for multiple commands. The order of the commands
+depends on the order of the flag.
+
+```sh
+snag -c "echo snag world" -c "echo rocks"
+```
+
+will output
+
+```sh
+|Passed     | echo snag world
+|Passed     | echo rocks
+```
+
+The `-v` flag enables verbose output. It will also override the `verbose`
+option form the snag file if it is defined to false.
+
+**NOTE**: using the `-c` flag will skip reading a snag file even if it
+exists in the current working directory.
+
 ## Caveats
 
 * Endless build loops

main.go

@@ -10,6 +10,19 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
+type cmdSlice []string
+
+func (c *cmdSlice) String() string {
+	return fmt.Sprintf("%s", *c)
+}
+
+func (c *cmdSlice) Set(value string) error {
+	*c = append(*c, value)
+	return nil
+}
+
+var cliCmds cmdSlice
+
 type config struct {
 	Script       []string `yaml:"script"`
 	IgnoredItems []string `yaml:"ignore"`
@@ -21,9 +34,14 @@ const (
 	VersionOutput = "Snag version " + Version
 )
 
-var version bool
+var (
+	version bool
+	verbose bool
+)
 
 func init() {
+	flag.Var(&cliCmds, "c", "List of commands to execute")
+	flag.BoolVar(&verbose, "v", false, "Verbose output")
 	flag.BoolVar(&version, "version", false, "display snag's version")
 }
 
@@ -34,18 +52,27 @@ func main() {
 		return
 	}
 
-	in, err := ioutil.ReadFile(".snag.yml")
-	if err != nil {
-		log.Fatal("Could not find '.snag.yml' in your current directory")
-	}
-
 	var c config
-	if err := yaml.Unmarshal(in, &c); err != nil {
-		log.Fatalf("Could not parse yml file. %s\n", err)
+	if len(cliCmds) > 0 {
+		c.Script = cliCmds
+	} else {
+		in, err := ioutil.ReadFile(".snag.yml")
+		if err != nil {
+			log.Fatal("Could not find '.snag.yml' in your current directory")
+		}
+
+		if err := yaml.Unmarshal(in, &c); err != nil {
+			log.Fatalf("Could not parse yml file. %s\n", err)
+		}
+
 	}
 
 	if len(c.Script) == 0 {
-		log.Fatal("You must have at least 1 command in your '.snag.yml'")
+		log.Fatal("You must specify at least 1 command.")
+	}
+
+	if verbose {
+		c.Verbose = verbose
 	}
 
 	b, err := NewBuilder(c)