Add basic inspect feature

mailq/queue.go

@@ -1,6 +1,8 @@
 package mailq
 
 import (
+	"errors"
+	"fmt"
 	"time"
 )
 
@@ -21,3 +23,12 @@ type QEntry struct {
 	Recipients []string
 	Reason     string
 }
+
+func (q MailQ) GetMessageById(id string) (QEntry, error) {
+	for _, entry := range q.Entries {
+		if entry.Id == id {
+			return entry, nil
+		}
+	}
+	return QEntry{}, errors.New(fmt.Sprintf("No message with id '%s' available!", id))
+}

shell.go

@@ -48,6 +48,20 @@ func updateSortConfig(fields []string, state shellState) shellState {
 	return state
 }
 
+func displayMessageDetails(fields []string, writer io.Writer, state shellState) {
+	if len(fields) < 2 {
+		fmt.Fprintln(writer, "Please state the Id of the message to inspect!")
+		return
+	}
+	messageId := fields[1]
+	message, err := state.Queue.GetMessageById(messageId)
+	if err != nil {
+		fmt.Fprintf(writer, "Could not inspect message with id '%s': '%s'\n", messageId, err.Error())
+	} else {
+		fmt.Fprintf(writer, "%s\n", message.DetailedString())
+	}
+}
+
 func interactiveShell(reader io.Reader, writer io.Writer) {
 	var state shellState = initialShellState()
 	fmt.Fprintln(writer, "Let's try an interactive shell!")
@@ -67,8 +81,10 @@ func interactiveShell(reader io.Reader, writer io.Writer) {
 		switch cmd {
 		case "help", "?":
 			printHelp(writer)
-		case "exit", "quit":
+		case "exit":
 			state.QuitShell = true
+		case "inspect":
+			displayMessageDetails(textFields, writer, state)
 		case "sort":
 			state = updateSortConfig(textFields, state)
 		case "show":
@@ -94,5 +110,5 @@ func interactiveShell(reader io.Reader, writer io.Writer) {
 func printHelp(writer io.Writer) {
 	fmt.Fprintln(writer, "Available commands:")
 	fmt.Fprintln(writer, "?, help: display this output")
-	fmt.Fprintln(writer, "exit, quit: quit this program")
+	fmt.Fprintln(writer, "exit: quit this program")
 }