Prints HTML contents of inspected node in Firebug. Requires firebug and mozrepl to be installed in Firefox. For Python 2.6, requires python-argparse.

mozrepl-inspect.py

#! /usr/bin/python2.6
#NOTE: Also python3 compatible.
from __future__ import print_function,unicode_literals
import time, json, sys, re
from argparse import ArgumentParser
from telnetlib import Telnet

class Mozrepl:
    def __init__(self, host="127.0.0.1", port=4242):
        self.host = host
        self.port = port
    
    def __enter__(self):
        #Start Telnet
        self.t = Telnet(self.host, self.port)
        #Wait for Prompt, and detect repl name at the same time
        _, match, _ = self.t.expect([br'(repl\d*)> '], timeout = 250)
        if match is None:
            raise Exception('Timeout: Could not detect prompt')
        self._context = match.group(1)
        self.context = match.group(1).decode()
        self.prompt = match.group(0)
        return self
    
    def __exit__(self, type, value, traceback):
        self.t.close()
        del self.t
        
    def js(self, command):
        cmd = "(function(repl){{ eval({0}); }})({1});".format(json.dumps(command), self.context)
        self.t.write(cmd.encode() + b"\n")
        x = self.t.read_until(self.prompt).decode('utf-8', 'replace')
        return x[:-(len(self.prompt))]

def main():
    p = ArgumentParser()
    p.add_argument("host", nargs="?", default = "localhost")
    p.add_argument("port", nargs="?", default = 4242)
    args = p.parse_args()
    with Mozrepl(args.host, args.port) as x:
        init_results = x.js(r"""repl.json_stringify = function(s) {
                var jsonRegex = new RegExp('[\\u007f-\\uffff]', 'g');
                var jsonRegexReplace = function(c) {
                    return '\\u'+('0000'+c.charCodeAt(0).toString(16)).slice(-4);
                };
                    var json = JSON.stringify(s);
                    return json.replace(jsonRegex, jsonRegexReplace);
                }
            repl.firebuglistener = {
                onStartInspecting: function(context) {},
                onInspectNode: function(context, node) {},
                onStopInspecting: function(context, node, canceled) {
                if (!canceled) {
                    repl.firebuginspectnode = node;
                }

                }
            }
            var wm = Components.classes["@mozilla.org/appshell/window-mediator;1"] .getService(Components.interfaces.nsIWindowMediator);
            var i = 0;
            for(var e = wm.getEnumerator("navigator:browser"); e.hasMoreElements();) {
                i++;
                e.getNext();
            }
            if (i > 1) {
                repl.print("win warn");
            }
            repl.firebugwin = wm.getMostRecentWindow("navigator:browser");
            if (repl.firebugwin) {
                repl.print("win ok");
                if (repl.firebugwin.Firebug) {
                    repl.print("firebug ok");
                    if (repl.firebugwin.Firebug.Inspector) {
                        repl.print("inspector ok");
                        repl.firebugwin.Firebug.Inspector.addListener(repl.firebuglistener);
                    }
                }
            }
            """)
        #Check init results
        if init_results.find("win ok") == -1:
            #Could not find browser window
            print("error: No web browser window found!", file = sys.stderr)
            sys.exit(1)
        if init_results.find("win warn") != -1:
            win_name = json.loads(x.js("repl.print(repl.json_stringify(repl.firebugwin.document.title))"))
            print("warning: Multiple browser windows found. Using: {0}".format(win_name), file = sys.stderr)
        if init_results.find("firebug ok") == -1:
            print("error: Firebug not installed in firefox!", file = sys.stderr)
            sys.exit(1)
        if init_results.find("inspector ok") == -1:
            print("error: Firebug has not been initialised in firefox. Initialise it by clicking the firebug icon.", file = sys.stderr)
            sys.exit(1)
        while True:
            html = x.js(r'''
            if (repl.firebuginspectnode) {
                repl.print(repl.json_stringify(repl.firebuginspectnode.outerHTML));
            }''')
            if html.strip():
                print(json.loads(html))
                break
            time.sleep(1)
        x.js(r"repl.firebugwin.Firebug.Inspector.removeListener(repl.firebuglistener)")

if __name__ == "__main__":
    main()