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, 14 deletions

diff --git a/scripts/nix-push.in b/scripts/nix-push.in
index 00d03c3c1f0c..993b94adf064 100755
--- a/scripts/nix-push.in
+++ b/scripts/nix-push.in
@@ -24,22 +24,11 @@ my $writeManifest = 0;
 my $archivesURL;
 my @roots;
 
-sub showSyntax {
-    print STDERR <<EOF
-Usage: nix-push --dest DIR [--manifest] [--url-prefix URL] PATHS...
-
-`nix-push' packs the closure of PATHS into a set of NAR files stored
-in DIR.  Optionally generate a manifest.
-EOF
-    ; # `
-    exit 1;
-}
-
 for (my $n = 0; $n < scalar @ARGV; $n++) {
     my $arg = $ARGV[$n];
 
     if ($arg eq "--help") {
-        showSyntax;
+        exec "man nix-push" or die;
     } elsif ($arg eq "--bzip2") {
         $compressionType = "bzip2";
     } elsif ($arg eq "--force") {
@@ -56,13 +45,13 @@ for (my $n = 0; $n < scalar @ARGV; $n++) {
         die "$0: `$arg' requires an argument\n" unless $n < scalar @ARGV;
         $archivesURL = $ARGV[$n];
     } elsif (substr($arg, 0, 1) eq "-") {
-        showSyntax;
+        die "$0: unknown flag `$arg'\n";
     } else {
         push @roots, $arg;
     }
 }
 
-showSyntax if !defined $destDir;
+die "$0: please specify a destination directory\n" if !defined $destDir;
 
 $archivesURL = "file://$destDir" unless defined $archivesURL;