alternate background color for table rows

extra_scripts/codemirror/mode/bfm/bfm.js

@@ -0,0 +1,71 @@
+(function(mod) {
+  if (typeof exports == "object" && typeof module == "object") // CommonJS
+    mod(require("../codemirror/lib/codemirror"), require("../codemirror/mode/gfm/gfm"))
+  else if (typeof define == "function" && define.amd) // AMD
+    define(["../codemirror/lib/codemirror", "../codemirror/mode/gfm/gfm"], mod)
+  else // Plain browser env
+    mod(CodeMirror)
+})(function(CodeMirror) {
+  'use strict'
+
+  CodeMirror.defineMode('bfm', function(config, gfmConfig) {
+    const bfmOverlay = {
+      startState() {
+        return {
+          inTable: false,
+          rowIndex: 0
+        }
+      },
+      copyState(s) {
+        return {
+          inTable: s.inTable,
+          rowIndex: s.rowIndex
+        }
+      },
+      token(stream, state) {
+        state.combineTokens = true
+
+        if (state.inTable) {
+          if (stream.match(/^\|/)) {
+            ++state.rowIndex
+
+            stream.skipToEnd()
+
+            if (state.rowIndex === 1) {
+              return 'table table-separator'
+            } else if (state.rowIndex % 2 === 0) {
+              return 'table table-row table-row-even'
+            } else {
+              return 'table table-row table-row-odd'
+            }
+          } else {
+            state.inTable = false
+
+            stream.skipToEnd()
+            return null
+          }
+        } else if (stream.match(/^\|/)) {
+          state.inTable = true
+          state.rowIndex = 0
+
+          stream.skipToEnd()
+          return 'table table-header'
+        }
+
+        stream.skipToEnd()
+        return null
+      }
+    }
+
+    gfmConfig.name = 'gfm'
+    return CodeMirror.overlayMode(CodeMirror.getMode(config, gfmConfig), bfmOverlay)
+  })
+
+  CodeMirror.defineMIME('text/x-bfm', 'bfm')
+
+  CodeMirror.modeInfo.push({
+    name: "Boost Flavored Markdown",
+    mime: "text/x-bfm",
+    mode: "bfm"
+  })
+})