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Adding CLI usage banner #3

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33 changes: 17 additions & 16 deletions douceur.go
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Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,16 @@ const (
Version = "0.2.0"
)

var (
flagVersion bool
)
// Usage banner for when the command line is invoked improperly
var Usage = func() {
fmt.Fprintf(os.Stderr, "USAGE: douceur [parse|inline] filename\n")
flag.PrintDefaults()
}
var flagVersion bool

func init() {
flag.BoolVar(&flagVersion, "version", false, "Display version")
flag.Usage = Usage
}

func main() {
Expand All @@ -33,28 +37,25 @@ func main() {

args := flag.Args()

if len(args) == 0 {
fmt.Println("No command supplied")
if len(args) < 1 {
flag.Usage()
os.Exit(1)
}

if len(args) < 2 {
fmt.Fprintf(os.Stderr, "Missing file path")
flag.Usage()
os.Exit(1)
}

switch args[0] {
case "parse":
if len(args) < 2 {
fmt.Println("Missing file path")
os.Exit(1)
}

parseCSS(args[1])
case "inline":
if len(args) < 2 {
fmt.Println("Missing file path")
os.Exit(1)
}

inlineCSS(args[1])
default:
fmt.Println("Unexpected command: ", args[0])
fmt.Fprintf(os.Stderr, "Unexpected command: %s", args[0])
flag.Usage()
os.Exit(1)
}
}
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