First cut - can recursively read yaml!

yaml.go

@@ -7,6 +7,7 @@ import (
   "io/ioutil"
   "os"
   "github.com/codegangsta/cli"
+  "strings"
 )
 
 func main() {
@@ -17,7 +18,7 @@ func main() {
     {
       Name:      "read",
       Aliases:     []string{"r"},
-      Usage:     "(default) reads a property from a given yaml file",
+      Usage:     "read <filename> <path>\n\te.g.: yaml read sample.json a.b.c\n\t(default) reads a property from a given yaml file",
       Action:   read_file,
     },
   }
@@ -31,17 +32,31 @@ func read_file(c *cli.Context) {
   }
   var filename = c.Args()[0]
   var raw_data, read_error = ioutil.ReadFile(filename)
-
   if read_error != nil {
     log.Fatalf("error: %v", read_error)
   }
 
-  var parsed_data interface{}
+  var parsed_data map[interface{}]interface{}
 
   err := yaml.Unmarshal([]byte(raw_data), &parsed_data)
   if err != nil {
     log.Fatalf("error: %v", err)
   }
 
-  fmt.Println(parsed_data)
+  var path = c.Args()[1]
+  var paths = strings.Split(path, ".")
+
+  fmt.Println(read(parsed_data, paths[0], paths[1:len(paths)]))
+}
+
+func read(context map[interface{}]interface{}, head string, tail []string) interface{} {
+  value := context[head]
+  // fmt.Println("read called")
+
+  switch value.(type) {
+    case bool, int, string, []interface{}:
+      return value
+    default: // recurse into map
+      return read(value.(map[interface{}]interface{}), tail[0], tail[1:len(tail)])
+  }
 }