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

Browse source 
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).
This commit is contained in:
Eelco Dolstra 2012-10-03 16:37:06 -04:00
parent 9c41c66c5b
commit a562d544d8
25 changed files with 51 additions and 329 deletions
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23
scripts/nix-install-package.in
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@ -6,25 +6,8 @@ use Nix::Config;
use Nix::Utils;
sub usageError {
print STDERR <<EOF;
Usage: nix-install-package (FILE | --url URL)
Install a Nix Package (.nixpkg) either directly from FILE or by
downloading it from URL.
Flags:
--profile / -p LINK: install into the specified profile
--non-interactive: don't run inside a new terminal
EOF
; # '
exit 1;
}
# Parse the command line arguments.
my @args = @ARGV;
usageError if scalar @args == 0;
my $source;
my $fromURL = 0;
@ -34,14 +17,14 @@ my $interactive = 1;
while (scalar @args) {
my $arg = shift @args;
if ($arg eq "--help") {
usageError;
exec "man nix-install-package" or die;
}
elsif ($arg eq "--url") {
$fromURL = 1;
}
elsif ($arg eq "--profile" || $arg eq "-p") {
my $profile = shift @args;
usageError if !defined $profile;
die "$0: `--profile' requires an argument\n" if !defined $profile;
push @extraNixEnvArgs, "-p", $profile;
}
elsif ($arg eq "--non-interactive") {
@ -52,7 +35,7 @@ while (scalar @args) {
}
}
usageError unless defined $source;
die "$0: please specify a .nixpkg file or URL\n" unless defined $source;
# Re-execute in a terminal, if necessary, so that if we're executed