FZF_KEY enhancements

* 'enter' instead of 'ctrl-m'
* 'space' instead of ' '

test/test_core.rb

@@ -1607,4 +1607,49 @@ class TestCore < TestInteractive
       assert_equal 4, lines.match_count
     end
   end
+
+  def test_env_vars
+    def to_vars(lines)
+      lines.select { it.start_with?('FZF_') }.to_h do
+        key, val = it.split('=', 2)
+        [key.to_sym, val]
+      end
+    end
+
+    tmux.send_keys %(seq 100 | #{FZF} --multi --reverse --preview-window up,noborder --preview 'env | grep ^FZF_ | sort' --no-input --bind enter:show-input+refresh-preview,space:disable-search+refresh-preview), :Enter
+    expected = {
+      FZF_TOTAL_COUNT:  '100',
+      FZF_MATCH_COUNT:  '100',
+      FZF_SELECT_COUNT: '0',
+      FZF_ACTION:       'start',
+      FZF_KEY:          '',
+      FZF_POS:          '1',
+      FZF_QUERY:        '',
+      FZF_PROMPT:       '>',
+      FZF_INPUT_STATE:  'hidden'
+    }
+    tmux.until do |lines|
+      assert_equal expected, to_vars(lines).slice(*expected.keys)
+    end
+    tmux.send_keys :Enter
+    tmux.until do |lines|
+      expected.merge!(FZF_INPUT_STATE: 'enabled', FZF_ACTION: 'show-input', FZF_KEY: 'enter')
+      assert_equal expected, to_vars(lines).slice(*expected.keys)
+    end
+    tmux.send_keys :Tab, :Tab
+    tmux.until do |lines|
+      expected.merge!(FZF_ACTION: 'toggle-down', FZF_KEY: 'tab', FZF_POS: '3', FZF_SELECT_COUNT: '2')
+      assert_equal expected, to_vars(lines).slice(*expected.keys)
+    end
+    tmux.send_keys '99'
+    tmux.until do |lines|
+      expected.merge!(FZF_ACTION: 'char', FZF_KEY: '9', FZF_QUERY: '99', FZF_MATCH_COUNT: '1', FZF_POS: '1')
+      assert_equal expected, to_vars(lines).slice(*expected.keys)
+    end
+    tmux.send_keys :Space
+    tmux.until do |lines|
+      expected.merge!(FZF_INPUT_STATE: 'disabled', FZF_ACTION: 'disable-search', FZF_KEY: 'space')
+      assert_equal expected, to_vars(lines).slice(*expected.keys)
+    end
+  end
 end