From f9f7f8ab877ac823923b98ae67406335fe8c8880 Mon Sep 17 00:00:00 2001
From: Eduardo Gurgel Pinho <eduardo@gurgel.me>
Date: Sun, 28 Jun 2026 13:56:48 +1200
Subject: [PATCH] feat: add squish filter

---
 lib/solid/standard_filter.ex                  | 23 +++++++++++++++++++
 .../integration/scenarios/filter/input.liquid |  9 ++++++++
 2 files changed, 32 insertions(+)

diff --git a/lib/solid/standard_filter.ex b/lib/solid/standard_filter.ex
index 8fbe8f8..2268bc3 100644
--- a/lib/solid/standard_filter.ex
+++ b/lib/solid/standard_filter.ex
@@ -989,6 +989,29 @@ defmodule Solid.StandardFilter do
   @spec strip(term) :: String.t()
   def strip(input), do: String.trim(to_str(input))
 
+  @doc """
+  Removes leading and trailing whitespace and collapses consecutive whitespace to a single space.
+
+  iex> Solid.StandardFilter.squish("  foo   bar  baz  ")
+  "foo bar baz"
+
+  iex> Solid.StandardFilter.squish("foo\\n  bar\\t baz")
+  "foo bar baz"
+
+  iex> Solid.StandardFilter.squish("   ")
+  ""
+
+  iex> Solid.StandardFilter.squish(nil)
+  ""
+  """
+  @spec squish(term) :: String.t()
+  def squish(input) do
+    input
+    |> to_str()
+    |> String.split()
+    |> Enum.join(" ")
+  end
+
   @doc """
   Multiplies a number by another number.
 
diff --git a/test/solid/integration/scenarios/filter/input.liquid b/test/solid/integration/scenarios/filter/input.liquid
index 0cdf786..112dea0 100644
--- a/test/solid/integration/scenarios/filter/input.liquid
+++ b/test/solid/integration/scenarios/filter/input.liquid
@@ -136,6 +136,15 @@ strip
 {{ unknown | strip }}
 {% # {{ posts | strip }} %}
 
+squish
+
+{{ "  foo   bar  baz  " | squish }}
+{{ "foo
+  bar	 baz" | squish }}
+{{ "   " | squish }}
+{{ nil | squish }}
+{{ 5 | squish }}
+
 minus
 
 {{ 4 | minus: 2 }}