seed the editing tmp file with the last line of history

lib/index.js

@@ -98,7 +98,7 @@ function extendRepl(aRepl) {
 
 function edit(cmdFile, editor) {
   editor = editor || process.env['VISUAL'] || process.env['EDITOR']
-  // TODO seed the file with repl.context._ if the file doesn't exist yet
+
   var fds = [process.openStdin(), process.stdout, process.stdout]
     , args = [cmdFile]
 
@@ -108,6 +108,19 @@ function edit(cmdFile, editor) {
     args = words.slice(1).concat(args)
     editor = words[0]
   }
+
+  // seed the file with repl.context._ if the file doesn't exist yet
+  try {
+    fs.statSync(cmdFile)
+  }
+  catch (e) {
+    // skip history[0], it's the .edit command
+    var lastCmd = theRepl.rli.history[1]
+    if (lastCmd && lastCmd[0] !== '.') {
+      fs.writeFileSync(cmdFile, lastCmd)
+    }
+  }
+
   pause()
   spawn(editor, args, {customFds: fds}).on('exit', function(code) {
     // some editors change the terminal resulting in skewed output, clean up