Implement CLI scaffold

cmd/mailfull/command/init.go

@@ -0,0 +1,41 @@
+package command
+
+import (
+	"fmt"
+
+	"github.com/directorz/mailfull-go"
+)
+
+// InitCommand represents a InitCommand.
+type InitCommand struct {
+	Meta
+}
+
+// Synopsis returns a one-line synopsis.
+func (c *InitCommand) Synopsis() string {
+	return "Initializes current directory as a Mailfull repository."
+}
+
+// Help returns long-form help text.
+func (c *InitCommand) Help() string {
+	txt := fmt.Sprintf(`
+Usage:
+    %s %s
+
+Description:
+    Initializes current directory as a Mailfull repository.
+`,
+		c.CmdName, c.SubCmdName)
+
+	return txt[1:]
+}
+
+// Run runs the command and returns the exit status.
+func (c *InitCommand) Run(args []string) int {
+	if err := mailfull.InitRepository("."); err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+
+	return 0
+}