[Added] Zlib License

lib/license_finder/license/definitions.rb

@@ -27,7 +27,8 @@ def all
           ruby,
           simplifiedbsd,
           wtfpl,
-          zerobsd
+          zerobsd,
+          zlib
         ]
       end
 
@@ -349,6 +350,17 @@ def zerobsd
           matcher: matcher
         )
       end
+
+      def zlib
+        License.new(
+          short_name: 'Zlib',
+          pretty_name: 'zlib/libpng license',
+          other_names: [
+            'zlib License'
+          ],
+          url: 'https://opensource.org/licenses/Zlib'
+        )
+      end
     end
   end
 end

lib/license_finder/license/templates/Zlib.txt

@@ -0,0 +1,17 @@
+Copyright (c) <year> <copyright holders>
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.

spec/lib/license_finder/license/definitions_spec.rb

@@ -223,3 +223,40 @@
     expect(described_class.find_by_name('Zero-Clause BSD').url).to be
   end
 end
+
+describe LicenseFinder::License, 'Zlib' do
+  it 'should be recognized' do
+    expect(described_class.find_by_name('Zlib').url).to be
+    expect(described_class.find_by_name('zlib/libpng license').url).to be
+    expect(described_class.find_by_name('zlib License').url).to be
+  end
+
+  it 'should match regardless of year or copyright holder names' do
+    license = <<-LICENSE
+SOFTWARE NAME - Copyright (c) 1995-2017 - COPYRIGHT HOLDER NAME
+
+This software is provided 'as-is', without any express or
+implied warranty. In no event will the authors be held
+liable for any damages arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute
+it freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented;
+   you must not claim that you wrote the original software.
+   If you use this software in a product, an acknowledgment
+   in the product documentation would be appreciated but
+   is not required.
+
+2. Altered source versions must be plainly marked as such,
+   and must not be misrepresented as being the original software.
+
+3. This notice may not be removed or altered from any
+   source distribution.
+    LICENSE
+
+    expect(described_class.find_by_name('Zlib')).to be_matches_text license
+    expect(described_class.find_by_name('Zlib')).not_to be_matches_text 'SOME OTHER LICENSE'
+  end
+end