Added missing FindMathJax (from eris)

cmake/Modules/FindMathJax.cmake

@@ -0,0 +1,38 @@
+# Tries to find MathJax.js.  Once done this will define:
+#  MATHJAX_FOUND - System has MathJax
+#  MATHJAX_PATH - the directory containing MathJax.js
+#  MATHJAX_VERSION - the version of MathJax.js
+#
+# The following will be searched, in order of precedence:
+# - MATHJAX_ROOT cmake variable
+# - MATHJAX_ROOT environment variable
+# - ${CMAKE_PREFIX_PATH}/share/javascript/mathjax
+# - /usr/share/javascript/mathjax
+#
+
+include(FindPackageHandleStandardArgs)
+
+find_path(MATHJAX_PATH MathJax.js
+    PATHS ${MATHJAX_ROOT}
+        $ENV{MATHJAX_ROOT}
+        "${CMAKE_PREFIX_PATH}/share/javascript/mathjax"
+        "${CMAKE_INSTALL_DATADIR}/javascript/mathjax"
+        "/usr/share/javascript/mathjax"
+    DOC "Root path of MathJax.js")
+
+# Extract the version number from MathJax.js, which may or may not be minified.
+if (NOT MATHJAX_PATH STREQUAL MATHJAX_PATH-NOTFOUND)
+    file(READ "${MATHJAX_PATH}/MathJax.js" _mathjax_js_source)
+    string(REGEX MATCH "MathJax\\.version *= *\"[0-9]+\\.[0-9]+\";" _mathjax_js_vers "${_mathjax_js_source}")
+    unset(_mathjax_js_source)
+    string(REGEX REPLACE ".*([0-9]+\\.[0-9]+).*" "\\1" MATHJAX_VERSION "${_mathjax_js_vers}")
+    unset(_mathjax_js_vers)
+endif()
+
+find_package_handle_standard_args(MathJax
+    REQUIRED_VARS MATHJAX_PATH
+    VERSION_VAR MATHJAX_VERSION
+    )
+
+mark_as_advanced(MATHJAX_PATH)
+