GetOpt::Long optional arguments using a colon instead of an equal sign

Instead of writing `foo|f=s` you can also write `foo|f:s` for a GetOpt::Long
option spec [1], thus making the argument optional.

The current implementation of `_spec_to_help` will wrongly render this as two
long options:

    --dirport, --d:9030
       directory port

instead of a short and a long one:

    -d, --dirport=INTEGER
       directory port

This commit fixes the the parsing of the spec, detection of the type and adds
tests for a few common cases this could be used in.

[1] http://perldoc.perl.org/Getopt/Long.html#Summary-of-Option-Specifications

2 files changed, 31 insertions, 3 deletions

diff --git a/lib/Monitoring/Plugin/Getopt.pm b/lib/Monitoring/Plugin/Getopt.pm
index ebdd559..e09ff62 100644
--- a/lib/Monitoring/Plugin/Getopt.pm
+++ b/lib/Monitoring/Plugin/Getopt.pm
@@ -81,7 +81,7 @@ sub _spec_to_help
 {
   my ($self, $spec, $label) = @_;
 
-  my ($opts, $type) = split /=/, $spec, 2;
+  my ($opts, $type) = split /=|:/, $spec, 2;
   my (@short, @long);
   for (split /\|/, $opts) {
     if (length $_ == 1) {
@@ -97,7 +97,7 @@ sub _spec_to_help
       $help .= '=' . $label;
     }
     else {
-      $help .= $type eq 'i' ? '=INTEGER' : '=STRING';
+      $help .= ($type eq 'i' || $type eq '+' || $type =~ /\d+/) ? '=INTEGER' : '=STRING';
     }
   }
   elsif ($label) {
diff --git a/t/Monitoring-Plugin-Getopt-04.t b/t/Monitoring-Plugin-Getopt-04.t
index b6345d0..9b51883 100644
--- a/t/Monitoring-Plugin-Getopt-04.t
+++ b/t/Monitoring-Plugin-Getopt-04.t
@@ -2,7 +2,7 @@
 
 use strict;
 
-use Test::More tests => 11;
+use Test::More tests => 15;
 BEGIN { use_ok('Monitoring::Plugin::Getopt') };
 
 # Needed to get evals to work in testing
@@ -78,6 +78,30 @@ sub setup
     [ undef, 'PERCENT%' ],
   );
 
+  # Named args with *optional* but pre-set value
+  $ng->arg(
+    spec => 'dirport|d:9030',
+    help => 'dirport',
+  );
+
+  # Named args with *optional* string value
+  $ng->arg(
+    spec => 'enablesomething|s:s',
+    help => 'something',
+  );
+
+  # Named args with *optional* integer value (same as ":0")
+  $ng->arg(
+    spec => 'testtimeout|T:i',
+    help => 'testtimeout',
+  );
+
+  # Named args with *optional* but increasing integer value
+  $ng->arg(
+    spec => 'verbosity|v:+',
+    help => 'verbosity',
+  );
+
   return $ng;
 }
 
@@ -94,4 +118,8 @@ like($@, qr/\n -H, --hostname=ADDRESS\n   Hostname\n/, 'hostname ok');
 like($@, qr/\n --avatar=AVATAR\n   Avatar\n/, 'avatar ok');
 like($@, qr/\n --disk=BYTES\n   Disk limit in BYTES\n --disk=PERCENT%\n   Disk limit in PERCENT\n --disk=STRING\n   Disk limit in FOOBARS \(Default: 1024\)\n/, 'disk multiline ok');
 like($@, qr/\n --limit=STRING\n   Limit in BYTES\n --limit=PERCENT%\n   Limit in PERCENT\n/, 'limit multiline ok');
+like($@, qr/\n -d, --dirport=INTEGER/, 'dirport ok');
+like($@, qr/\n -s, --enablesomething=STRING/, 'enablesomething ok');
+like($@, qr/\n -T, --testtimeout=INTEGER/, 'testtimeout ok');
+like($@, qr/\n -v, --verbosity=INTEGER/, 'verbosity ok');
 #print $@;