1 files changed, 66 insertions, 0 deletions
diff --git a/interface.go b/interface.go
new file mode 100644
index 0000000..d6d4a63
--- /dev/null
+++ b/interface.go
@@ -0,0 +1,66 @@
+package prep
+
+// this is a work in progress
+
+// Versioned is the interface that the destination struct should implement to
+// make a version string appear at the top of the help message.
+type Appnamed interface {
+	// Version returns the version string that will be printed on a line by itself
+	// at the top of the help message.
+	Appname() string
+}
+
+type AutoFuncd interface {
+	// Version returns the version string that will be printed on a line by itself
+	// at the top of the help message.
+	DoAutoComplete(*Auto)
+}
+
+type Buildtimed interface {
+	Buildtime() (string, string)
+}
+
+type Examplesd interface {
+	// Version returns the version string that will be printed on a line by itself
+	// at the top of the help message.
+	Examples() string
+}
+
+type ExitI interface {
+	// Version returns the version string that will be printed on a line by itself
+	// at the top of the help message.
+	Exit()
+}
+
+// Described is the interface that the destination struct should implement to
+func findAppInfo(tmp interface{}) {
+	if tmp, ok := tmp.(Appnamed); ok {
+		myAuto.appName = tmp.Appname()
+	} else {
+		panic("you must define in your app the function: (argv) func Appname() string")
+	}
+
+	if tmp, ok := tmp.(Buildtimed); ok {
+		myAuto.buildtime = tmp.Buildtime
+	} else {
+		// panic("you need to make the function argv.Appname()")
+	}
+
+	if tmp, ok := tmp.(Examplesd); ok {
+		myAuto.examples = tmp.Examples
+	} else {
+		// panic("you need to make the function argv.Appname()")
+	}
+
+	if tmp, ok := tmp.(AutoFuncd); ok {
+		myAuto.autoFunc = tmp.DoAutoComplete
+	} else {
+		// panic("you need to make the function argv.DoAutoComplete()")
+	}
+
+	if tmp, ok := tmp.(ExitI); ok {
+		myAuto.appExit = tmp.Exit
+	} else {
+		// panic("you need to make the function argv.Exit()")
+	}
+}