Sort collector names.

This makes the `-collectors.print` output easier to read.

1 files changed, 7 insertions, 1 deletions

diff --git a/node_exporter.go b/node_exporter.go
index 19ac81f..26966e5 100644
--- a/node_exporter.go
+++ b/node_exporter.go
@@ -9,6 +9,7 @@ import (
         _ "net/http/pprof"
         "os"
         "os/signal"
+        "sort"
         "strings"
         "sync"
         "syscall"
@@ -142,8 +143,13 @@ func main() {
         flag.Parse()
 
         if *printCollectors {
-                fmt.Printf("Available collectors:\n")
+                collectorNames := make(sort.StringSlice, 0, len(collector.Factories))
                 for n, _ := range collector.Factories {
+                        collectorNames = append(collectorNames, n)
+                }
+                collectorNames.Sort()
+                fmt.Printf("Available collectors:\n")
+                for _, n := range collectorNames {
                         fmt.Printf(" - %s\n", n)
                 }
                 return