diff --git a/.gitignore b/.gitignore
index ddb174fde..bdf7976b5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,98 +1,99 @@
 # use glob syntax.
-syntax: glob
-scripts/change_name.sh
+*.a
+*.dylib
+*.egg-info/
+*.exe
+*.ilk
+*.log
+*.o
+*.opensdf
+*.orig
+*.pdb
+*.psess
+*.pyc
+*.sdf
 *.so
 *.so.[0123456789]
 *.so.[0123456789].[0123456789]
-*.o
-*.a
-*.dylib
-*~
-*CMakeFiles*
-example
-examples/bbw/bbw_demo_selfcontained/*
-examples/bbw/bbw_demo_selfcontained.zip
-examples/quicklook-mesh/Mesh.qlgenerator/*
-examples/*/*.mexmaci64
-examples/*/*.rbr
-example_static
-example_header_only
-example1
-/external
-.DS_Store
-libigl.zip
-*tags
-*.exe
-*.pdb
-*.sdf
 *.suo
-*.ilk
-*.log
+*.swo
+*.swp
 *.tlog
-Debug/
-Release/
-*.orig
 *.user
 *.vsp
-*.opensdf
-*.psess
-*.swp
-*.swo
-documentation/*.aux
-documentation/*.out
-documentation/*.log
+*CMakeFiles*
+*buildXcode*
+*tags
+*~
+.DS_Store
+.idea/
+.vs/
+.vscode/
+/external
+Debug/
+README.html
+Release/
+Untitled.ipynb
+build
 doc.html
+documentation/*.aux
+documentation/*.log
+documentation/*.out
+example
+example1
+example_header_only
+example_static
+examples/*/*.mexmaci64
+examples/*/*.rbr
 examples/bbw/bbw_demo
-external/medit/rebar.rbr
+examples/bbw/bbw_demo_selfcontained.zip
+examples/bbw/bbw_demo_selfcontained/*
 examples/bbw/examples/*-volume.dmat
 examples/bbw/examples/*-volume.mesh
-examples/upright/upright
 examples/principal_curvature/curvature
+examples/quicklook-mesh/Mesh.qlgenerator/*
+examples/upright/upright
 external/MeshFix/meshfix
 external/embree/build/*
+external/glew/build
+external/glfw/build
+external/libpng/build
+external/medit/rebar.rbr
 external/tetgen/tetgen
+external/tinyxml2/build
 external/tinyxml2/test
 external/tinyxml2/tinyxml2.pc
 external/yimg/showpng
-README.html
-tutorial/readme.html
-tutorial/*/build/*
-tutorial/data
-tutorial/*/Makefile
-external/glew/build
-external/glfw/build
-*buildXcode*
-tutorial/*/*.mexmaci64
-external/libpng/build
-external/tinyxml2/build
-optional/build
+iglhelpers.pyc
 lib
+libigl.zip
+optional/build
+python/.idea
+python/.ipynb_checkpoints
+python/__pycache__
+python/build
+python/build2
+python/build3
+python/build4
+python/builddebug
+python/buildstatic
+python/py_igl/todo
+python/py_igl/todo
+python/scripts/generated
+scripts/change_name.sh
+site/
+syntax: glob
+tests/bin
+tests/build
+tests/data
+tutorial/*/*.mexmaci64
+tutorial/*/Makefile
+tutorial/*/build/*
+tutorial/.idea
 tutorial/XXX_test/CMakeLists.txt
 tutorial/XXX_test/main.cpp
-python/py_igl/todo
-python/build
-python/.idea
-untitled
-Untitled.ipynb
-python/.ipynb_checkpoints
-python/py_igl/todo
-python/__pycache__
-iglhelpers.pyc
-python/build2
-tests/build
-tests/bin
-python/build3
-*.pyc
-python/build4
-python/scripts/generated
-python/builddebug
-tutorial/.idea
-python/buildstatic
-tutorial/cmake-build-debug
-.vscode/
-.idea/
-site/
-*.egg-info/
-.vs/
 tutorial/build
-build
+tutorial/cmake-build-debug
+tutorial/data
+tutorial/readme.html
+untitled