Add support for wildcard matches with '*' on roles and hosts.

eg:
  --roles=*_chicago,*_tokyo
  --hosts=app-*

Useful for targeted deploys.

lib/kamal/commander.rb

@@ -28,11 +28,11 @@ def specific_primary!
   end
 
   def specific_roles=(role_names)
-    @specific_roles = config.roles.select { |r| role_names.include?(r.name) } if role_names.present?
+    @specific_roles = Kamal::Utils.filter_specific_items(role_names, config.roles) if role_names.present?
   end
 
   def specific_hosts=(hosts)
-    @specific_hosts = config.all_hosts & hosts if hosts.present?
+    @specific_hosts = Kamal::Utils.filter_specific_items(hosts, config.all_hosts) if hosts.present?
   end
 
   def primary_host

lib/kamal/utils.rb

@@ -58,4 +58,20 @@ def escape_shell_value(value)
       .gsub(/`/, '\\\\`')
       .gsub(DOLLAR_SIGN_WITHOUT_SHELL_EXPANSION_REGEX, '\$')
   end
+
+  # Apply a list of host or role filters, including wildcard matches
+  def filter_specific_items(filters, items)
+    matches = []
+
+    Array(filters).select do |filter|
+      matches += Array(items).select do |item|
+        # Only allow * for a wildcard
+        pattern = Regexp.escape(filter).gsub('\*', '.*')
+        # items are roles or hosts
+        (item.respond_to?(:name) ? item.name : item).match(/^#{pattern}$/)
+      end
+    end
+
+    matches
+  end
 end

test/commander_test.rb

@@ -14,6 +14,18 @@ class CommanderTest < ActiveSupport::TestCase
 
     @kamal.specific_hosts = [ "1.1.1.1", "1.1.1.2" ]
     assert_equal [ "1.1.1.1", "1.1.1.2" ], @kamal.hosts
+
+    @kamal.specific_hosts = [ "1.1.1.1*" ]
+    assert_equal [ "1.1.1.1" ], @kamal.hosts
+
+    @kamal.specific_hosts = [ "1.1.1.*", "*.1.2.*" ]
+    assert_equal [ "1.1.1.1", "1.1.1.2", "1.1.1.3", "1.1.1.4" ], @kamal.hosts
+
+    @kamal.specific_hosts = [ "*" ]
+    assert_equal [ "1.1.1.1", "1.1.1.2", "1.1.1.3", "1.1.1.4" ], @kamal.hosts
+
+    @kamal.specific_hosts = [ "*miss" ]
+    assert_equal [], @kamal.hosts
   end
 
   test "filtering hosts by filtering roles" do
@@ -28,6 +40,18 @@ class CommanderTest < ActiveSupport::TestCase
 
     @kamal.specific_roles = [ "workers" ]
     assert_equal [ "workers" ], @kamal.roles.map(&:name)
+
+    @kamal.specific_roles = [ "w*" ]
+    assert_equal [ "web", "workers" ], @kamal.roles.map(&:name)
+
+    @kamal.specific_roles = [ "we*", "*orkers" ]
+    assert_equal [ "web", "workers" ], @kamal.roles.map(&:name)
+
+    @kamal.specific_roles = [ "*" ]
+    assert_equal [ "web", "workers" ], @kamal.roles.map(&:name)
+
+    @kamal.specific_roles = [ "*miss" ]
+    assert_equal [], @kamal.roles.map(&:name)
   end
 
   test "filtering roles by filtering hosts" do