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debugger: introduce exec method for debugger
In debugger, the usage of `repl` very ugly. I'd like there is a `p` like gdb. So the `exec` is coming. Usage: ``` $ ./iojs debug ~/git/node_research/server.js < Debugger listening on port 5858 connecting to 127.0.0.1:5858 ... ok break in /Users/jacksontian/git/node_research/server.js:1 > 1 var http = require('http'); 2 3 http.createServer(function (req, res) { debug> exec process.title /Users/jacksontian/git/io.js/out/Release/iojs debug> ``` And the `repl`: ``` debug> repl Press Ctrl + C to leave debug repl > process.title '/Users/jacksontian/git/io.js/out/Release/iojs' debug> (^C again to quit) ``` The enter and leave debug repl is superfluous. R-URL: #1491 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Roman Reiss <me@silverwind.io> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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