Add -a flag to show all facts for a node

-a requires -n and prints all PuppetDB facts for the specified node
as 'fact_name  value' sorted alphabetically by fact name, useful for
discovering available facts to query against.

main.go

@@ -213,14 +213,34 @@ func isTerminal(f *os.File) bool {
 	return (fi.Mode() & os.ModeCharDevice) != 0
 }
 
-func run(cfg config, nodeName, factName, match, partialMatch string, showRole, nodeOnly, valueOnly, count, ansible, jsonMode bool) error {
+func allFactsForNode(puppetDBURL, node string) ([]fact, error) {
+	query, _ := json.Marshal([]interface{}{"=", "certname", node})
+	return queryPuppetDB(puppetDBURL, string(query))
+}
+
+func run(cfg config, nodeName, factName, match, partialMatch string, showRole, nodeOnly, valueOnly, count, ansible, jsonMode, allFacts bool) error {
 	signal.Ignore(syscall.SIGPIPE)
 
+	if allFacts {
+		if nodeName == "" {
+			return fmt.Errorf("-a requires -n")
+		}
+		facts, err := allFactsForNode(cfg.PuppetDBURL, nodeName)
+		if err != nil {
+			return err
+		}
+		sort.Slice(facts, func(i, j int) bool { return facts[i].Name < facts[j].Name })
+		for _, f := range facts {
+			fmt.Printf("%-40s %s\n", f.Name, valueString(f.Value))
+		}
+		return nil
+	}
+
 	if (nodeOnly || valueOnly || count || ansible) && !showRole && factName == "" {
 		return fmt.Errorf("-R or -F must be used with -1, -2, -C, or -A")
 	}
 
-	var allFacts []fact
+	var collected []fact
 	var stdinLines []string
 
 	doQuery := func(node string) error {
@@ -229,7 +249,7 @@ func run(cfg config, nodeName, factName, match, partialMatch string, showRole, n
 		if err != nil {
 			return err
 		}
-		allFacts = append(allFacts, facts...)
+		collected = append(collected, facts...)
 		return nil
 	}
 
@@ -256,12 +276,12 @@ func run(cfg config, nodeName, factName, match, partialMatch string, showRole, n
 		}
 	}
 
-	returnData := processResults(allFacts)
+	returnData := processResults(collected)
 
 	switch {
 	case jsonMode:
 		hostFactMap := map[string]map[string]interface{}{}
-		for _, f := range allFacts {
+		for _, f := range collected {
 			if _, ok := hostFactMap[f.Certname]; !ok {
 				hostFactMap[f.Certname] = map[string]interface{}{}
 			}
@@ -337,6 +357,7 @@ func main() {
 		count        bool
 		ansible      bool
 		jsonMode     bool
+		allFacts     bool
 		puppetDBURL  string
 	)
 
@@ -350,7 +371,7 @@ func main() {
 			return nil
 		},
 		RunE: func(cmd *cobra.Command, args []string) error {
-			return run(cfg, nodeName, factName, match, partialMatch, showRole, nodeOnly, valueOnly, count, ansible, jsonMode)
+			return run(cfg, nodeName, factName, match, partialMatch, showRole, nodeOnly, valueOnly, count, ansible, jsonMode, allFacts)
 		},
 		SilenceUsage: true,
 	}
@@ -366,6 +387,7 @@ func main() {
 	f.BoolVarP(&count, "count", "C", false, "Count fact occurrences")
 	f.BoolVarP(&ansible, "ansible", "A", false, "Output as Ansible inventory")
 	f.BoolVarP(&jsonMode, "json", "j", false, "Emit valid JSON for all output")
+	f.BoolVarP(&allFacts, "all", "a", false, "Show all facts for a node (requires -n)")
 	rootCmd.PersistentFlags().StringVar(&puppetDBURL, "url", cfg.PuppetDBURL, "PuppetDB facts URL (overrides config and NODE_LOOKUP_URL)")
 
 	configCmd := &cobra.Command{