When ‘--help’ is given, just run ‘man’ to show the manual page

I.e. do what git does.  I'm too lazy to keep the builtin help text up
to date :-)

Also add ‘--help’ to various commands that lacked it
(e.g. nix-collect-garbage).

1 files changed, 3 insertions, 1 deletions

diff --git a/scripts/nix-pull.in b/scripts/nix-pull.in
index fbd90c2b25..58dd2cf27e 100755
--- a/scripts/nix-pull.in
+++ b/scripts/nix-pull.in
@@ -89,7 +89,9 @@ sub processURL {
 
 while (@ARGV) {
     my $url = shift @ARGV;
-    if ($url eq "--skip-wrong-store") {
+    if ($url eq "--help") {
+        exec "man nix-pull" or die;
+    } elsif ($url eq "--skip-wrong-store") {
         # No-op, no longer supported.
     } else {
         processURL $url;