add status help

envconf.go

@@ -15,6 +15,8 @@ type cEntry struct {
 	dtype  DataType
 	unset  bool
 	empty  bool
+	defval string // The default value
+	hasdef bool   // Default value is defined
 }
 type Config struct {
 	parsed bool
@@ -73,6 +75,7 @@ func (c *Config) DefineDefault(key string, val string, dtype DataType) {
 		}
 		entry.dtype = dtype
 		entry.empty = false
+		entry.defval = val
 		c.env[upper] = entry
 	} else {
 		var entry cEntry
@@ -80,6 +83,7 @@ func (c *Config) DefineDefault(key string, val string, dtype DataType) {
 		entry.unset = true
 		entry.empty = false
 		entry.value = val
+		entry.defval = val
 		c.env[upper] = entry
 	}
 }
@@ -117,7 +121,7 @@ func (c *Config) Parse() {
 	}
 }
 
-func (c *Config) Help() {
+func (c *Config) help() {
 	max := make([]int, 2, 2)
 	for k, v := range c.env {
 		if v.dtype != TypeNone {
@@ -129,13 +133,43 @@ func (c *Config) Help() {
 			}
 		}
 	}
+	fmt.Println()
 	for k, v := range c.env {
 		if v.dtype != TypeNone {
+			if v.hasdef {
 				format := fmt.Sprintf("Variable   %%-%ds|   Type %%-%ds|   Default %%s\n", max[0]+3, max[1]+3)
-			fmt.Printf(format, k, v.dtype, v.value)
+				fmt.Printf(format, k, v.dtype, v.defval)
 			}
 		}
 	}
+	fmt.Println()
+	for k, v := range c.env {
+		if v.dtype != TypeNone {
+			if !v.hasdef {
+				format := fmt.Sprintf("Variable   %%-%ds|   Type %%-%ds|   Required", max[0]+3, max[1]+3)
+				fmt.Printf(format, k, v.dtype)
+			}
+		}
+	}
+	fmt.Println()
+}
+
+func (c *Config) StatusHelp() bool {
+	help := false
+	flags := make(map[string]bool)
+	flags["--help"] = true
+	flags["-help"] = true
+	flags["-h"] = true
+	if len(os.Args) > 1 {
+		key := strings.ToLower(strings.TrimSpace(os.Args[1]))
+		_, ok := flags[key]
+		if ok {
+			c.help()
+			return false
+		}
+	}
+	return c.Status()
+}
 
 // Status prints out failures that occured while parsing the environment to os.Stderr.
 // Variables that have been defined without a default value and are