From d589c516974058d84ce0e17ab51cd37ae91bfa21 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C3=ABl=20Gallego?= <mic.gallego@gmail.com>
Date: Thu, 19 Feb 2026 10:03:52 +0900
Subject: [PATCH] Add squish filter

---
 lib/liquid/standardfilters.rb            | 13 +++++++++++++
 test/integration/standard_filter_test.rb |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/lib/liquid/standardfilters.rb b/lib/liquid/standardfilters.rb
index 24e135d91..a91462f43 100644
--- a/lib/liquid/standardfilters.rb
+++ b/lib/liquid/standardfilters.rb
@@ -293,6 +293,19 @@ def split(input, pattern)
       input.split(pattern)
     end
 
+    # @liquid_public_docs
+    # @liquid_type filter
+    # @liquid_category string
+    # @liquid_summary
+    #   Removes leading and trailing whitespace and collapses consecutive whitespace to a single space.
+    # @liquid_syntax string | squish
+    # @liquid_return [string]
+    def squish(input)
+      return if input.nil?
+
+      Utils.to_s(input).strip.gsub(/\s+/, ' ')
+    end
+
     # @liquid_public_docs
     # @liquid_type filter
     # @liquid_category string
diff --git a/test/integration/standard_filter_test.rb b/test/integration/standard_filter_test.rb
index ef5f15493..b69bdf7af 100644
--- a/test/integration/standard_filter_test.rb
+++ b/test/integration/standard_filter_test.rb
@@ -164,6 +164,13 @@ def test_split
     assert_equal(['A', 'Z'], @filters.split('A1Z', 1))
   end
 
+  def test_squish_filter
+    assert_equal("foo bar boo", Liquid::Template.parse(%Q({{ " foo   bar    
+\t   boo   " | squish }})).render)
+    assert_equal("", Liquid::Template.parse('{{ nil | squish }}').render)
+    assert_equal("", Liquid::Template.parse('{{ " " | squish }}').render)
+  end
+
   def test_escape
     assert_equal('&lt;strong&gt;', @filters.escape('<strong>'))
     assert_equal('1', @filters.escape(1))