pspg 0.5 (new formula)

This adds a new formula for pspg, a pager intended for use by psql
which adds features nice to have when viewing relational data. These
include freezing columns and rows, consistent display of headers, and
colorful themes.

Closes #20686.

Signed-off-by: FX Coudert <fxcoudert@gmail.com>

Formula/pspg.rb

@@ -0,0 +1,27 @@
+class Pspg < Formula
+  desc "Unix pager optimized for psql"
+  homepage "https://github.com/okbob/pspg"
+  url "https://github.com/okbob/pspg/archive/0.5.tar.gz"
+  sha256 "754d1e380d072517e9bc2c3c38785e2f19a9f927f061de9a646fd1094baa204e"
+  head "https://github.com/okbob/pspg.git"
+
+  depends_on "ncurses"
+
+  def install
+    system "./configure", "--disable-debug",
+                          "--prefix=#{prefix}"
+    system "make", "install"
+  end
+
+  def caveats; <<~EOS
+    Add the following line to your psql profile (e.g. ~/.psqlrc)
+      \\setenv PAGER pspg
+      \\pset border 2
+      \\pset linestyle unicode
+    EOS
+  end
+
+  test do
+    assert_match("pspg-#{version}", shell_output("#{bin}/pspg --version").chomp)
+  end
+end