Ask Ubuntu General Room

Lucio

00:12

I just did a JS trick that makes me a JS ninja for the next minutes :)

now I need to document it..

Seth

@NathanOsman Penguins don't live up North.. (besides you, obviously ;)

Nathan Osman

:)

Lucio

@Seth wait a second O.o

isn't there where the snow is?

Seth

@hbdgaf cool, I'll take a look.

@Lucio Penguins only live in the South's snow... Odd right?

Just like Polar Bears aren't found in Antarctica.

Lucio

you know too much about geoetc

Seth

00:18

:)

Lucio

I have a chicken to eat

it is not the North but I think chicken is everywhere

Seth

@NathanOsman So, if you have a minute, why should I learn Qt over Gtk?

Lucio

ciao!

and nice weekend

Whaaaaaat

OMG RAIN

Seth

@Lucio Have fun!

@Whaaaaaat You just got rain? o_O

Nathan Osman

00:22

@Seth Sure!

First off, let me say that GTK is still a great windowing toolkit.

I used it for the first few versions of StackApplet and it got the job done.

However, Qt brings in the signal/slot paradigm.

And once you get the hang of this, it becomes tremendously powerful. gobject (GTK is built on gobject) has something like this but far less powerful.

Say you have two controls on a page. A numerical input box (a text entry box that only accepts numbers) and a slider (the widget with the handle that you drag back and forth).

Whaaaaaat

@Seth california

Nathan Osman

You can connect the change signal on the slider to the slot on the number entry box that changes the value.

Whaaaaaat

so now I can go install OpenELEC

Nathan Osman

Then whenever you drag the slider, the number entry box changes.

You can do the opposite as well, and have the slider jump to a value when the user changes the entry box.

Seth

hmm, yes, I saw that in a demonstration of Qt designer.

you'd think that would be easy no matter the framework/toolkit, but I guess it isn't?

Nathan Osman

00:26

Qt does a lot of introspection. So it knows a lot about the classes that you are writing.

So if you use the Qt webview component (for displaying HTML), you can expose classes to JavaScript and do really neat things.

(That's how FlackBot worked.)

Seth

Nice.

Nathan Osman

GTK is technically cross-platform, but it's often difficult to set up on Windows.

Getting projects cross-compiled is nearly impossible.

So if you want to support Windows, Qt is the clear winner.

I almost forgot... the real magic happens when you use signals and slots across threads.

This lets you do things in parallel without worrying about memory leaks and race conditions.

(Well... if you are using CPython, threading may be a problem, simply because of the GIL.)

Another reason - the Qt documentation is spectacular and the GTK documentation is - well, it's good, but not perfect or thorough.

Qt will explain every class in detail with examples. You are almost never guessing.

Hopefully that helps. Let me know if you have any questions.

Seth

Yes that helps, thank you :)

Nathan Osman

Great :)

Are you thinking of learning Qt in C++ or in Python with PyQt?

Seth

I didn't understand all of it (my skill level just isn't high enough sadly), but it was still helpful.

@NathanOsman Starting with Python.

Nathan Osman

00:33

Definitely go with PyQt 5 in Python 3 then.

Seth

I'm hoping to do some C++ eventually, but that isn't terribly high on my list at this instant.

Nathan Osman

Python 2.x is end-of-life and Qt 5 is stable and has been around for a while.

Seth

Which was one of the pros of Qt, it scales real well.

Nathan Osman

One very minor word of warning - you won't be able to sell a PyQt app without purchasing a license from Riverside (the authors). Open source apps are free to distribute though.

Qt itself is released under the LGPL 3.

Seth

@NathanOsman Yes, I definitely plan on using Python 3. I was hoping to use Qt 5 but there doesn't seem to be much book/tutorial wise yet (although the API docs seem to be there).

Nathan Osman

00:35

@Seth There aren't a lot of changes. So the majority of the tutorials will still apply. And the documentation should answer your questions.

Seth

@NathanOsman That is good to know. I definitely don't plan on selling anything right now, that is for sure :)

@NathanOsman Awesome! I'm not adverse to digging into the API docs but I'd rather not have to learn everything from them. Real code examples are so helpful.

Nathan Osman

I can start you off with a super simple example right off the bat. One sec.

github.com/nathan-osman/entropy-monitor/blob/master/…

It's a single file - it displays the amount of entropy in /proc/sys/kernel/random/poolsize.

Seth

Awesome, thanks!

Ubuntu Questions on U&L

02:12

0

Q: Strange leading whitespace in OPTARG when using getopts

I spent quite a while researching the problem I encountered but none of the getopts tutorial say anything about the leading whitespace in OPTARG when using getopts. In bash(on Ubuntu and OSX), executing below commands: OPTIND=1 && getopts ":n:" opt "-n 1" && echo "OPTARG: '$OPTARG'" and it ec...

Whaaaaaat

04:18

Guyz, I have a MacBook pro (yikes) and I cannot get nvidia drivers to work on it.

SmokeDetector

07:20

[ SmokeDetector ] Bad keyword in title: http://packersandmoverspune.top7quotes.in/ @ packers and movers in pune by Kapil Mishra on askubuntu.com

KasiyA

08:02

Hi

Can I upload a photo/photos to imgur.com via command-line and get their direct link as result??

RPi Awesomeness

14:48

Guys, I want to code. But I don't have anything I need to code. Any suggestions?

jokerdino

@RPiAwesomeness I don't understand. You want projects to code on?

Seth

@KasiyA Ask a question on the site :)

RPi Awesomeness

@jokerdino I want a project to code, yeah :)

Something. Anything!

Well, not anything.

I'd rather not re-write the Linux kernel.

jokerdino

lol.

if you are fond of qt5 and javascript, I can put you on my project :P

Seth

@RPiAwesomeness Go look through the command-line tags here and on U&L. Answering those is always fun and sometimes scripts are acceptable.

Ooh, what is your project @jokerdino?

jokerdino

14:58

oh hm, it's kanban app thingy.

haven't done a lot of work on it yet though.

RPi Awesomeness

@jokerdino Yeeaaah...never used either of those :P

Seth

Oh, interesting. Is this a touch app?

jokerdino

@Seth planning to port it to android

Seth

@RPiAwesomeness You've never used Javascript? :O

jokerdino

It's gonna be linux at first

RPi Awesomeness

15:01

@Seth Yeah o.o

Seth

Here's a good one @rpi, see Kasiya's message above? See if you can figure that out in python (or bash if you want)

jokerdino

@RPiAwesomeness think of it as your best opportunity to learn JS!

RPi Awesomeness

@jokerdino Actually, I'm doing just that right now :) Javascript/PHP chat room tutorial

jokerdino

nice :D

RPi Awesomeness

@Seth Definitely Python :) My BASH skills are deplorable.

jokerdino

15:08

when you think you wanna help out, ping me.

RPi Awesomeness

@Seth Oh boy. This looks insanely complicated...

github.com/jomo/imgur-screenshot/blob/master/…

That's supposedly a simple script O.O

Seth

That takes the screenshot too ;)

RPi Awesomeness

@Seth Yes, it does

Seth

And it actually does look kinda simple, from a cursory look.

RPi Awesomeness

Probably is, just long :P

I'm looking at the documentation now

Rinzwind

15:13

this seems to limited:
function is_mac() {
uname | grep -q "Darwin"
}

:+)

Seth

Yes, long.

RPi Awesomeness

Imgur actually has a Python API

Rinzwind

and could be me but that function does nothing? :D

jokerdino

imgur probably also has a commandline client

Seth

I was gonna say :)

RPi Awesomeness

15:14

Bother. I have to contact them for an API key. Not something I want to do for a simple project that I probably won't use :(

Rinzwind

@RPiAwesomeness in the script there is an "anonymous" key

Seth

@Rinzwind it is called later on I believe..

jokerdino

> Bart's Bash Script Uploader

Rinzwind

function notify() {
if is_mac; then

so it acts as a boolean

Seth

Yeah, guess so.

Rinzwind

15:16

I spotted a double text:

if ! (eval "$edit_command"); then
echo "Error for image '$img_file': command '$edit_command' failed, not uploading. For more information visit https://github.com/jomo/imgur-screenshot#troubleshooting" >> "$log_file"
echo "Error for image '$img_file': command '$edit_command' failed, not uploading. For more information visit https://github.com/jomo/imgur-screenshot#troubleshooting"
notify error "Something went wrong :(" "Information has been logged"
exit 1
fi

1 to a log and 1 to screen? I bet that can be a 1 liner :P

lol

ah well time for Log Horizon :-) bb

Seth

@RPiAwesomeness sirupsen.com/a-simple-imgur-bash-screenshot-utility still need an api key though :/

RPi Awesomeness

@Seth Yeah, I found that. I think I'm gonna do the Javascript/PHP chat room right now :)

It's an easier beginning project, not having to mess with API keys and whatnot :P

Seth

OK. Talk to you later than :-)

RPi Awesomeness

Plus, it's all local :)

Oh, I'll stay around, just be busy coding :)

Maybe I can re-create the chat xD

Yeah. No.

I should, after this, write a way to connect to chat via IRC...

That would be interestingly hard

Shouldn't

if(data.text){
    for (var i = 0; i < data.text.length; i++) {
        $('#chat-area').append($("

        "+ data.text[i] +"

        "));
    }
}

be

if(data.text){
    for (var i = 0; i < data.text.length; i++) {
        $('#chat-area').append($(

        "+ data.text[i] +"

        ));
    }
}

?

Or

if(data.text){
   for (var i = 0; i < data.text.length; i++) {
        $('#chat-area').append($("+ data.text[i] +"));
   }
}

@jokerdino ^?

jokerdino

15:37

hi?

RPi Awesomeness

Can you provide insight into the question above?

jokerdino

what's the question?

RPi Awesomeness

Shouldn't that first code be the second or third?

KasiyA

@Seth This is my question

1

Q: Upload a file to URL via command line

We can download a file using the following command line in Ubuntu: wget url Can anyone tell me how to upload file to URL? For an example I want to upload some photos on http://imgur.com/ and get their direct link as result in a text file.

command-line wget upload

jokerdino

@RPiAwesomeness lol, whichever one works is the best one

RPi Awesomeness

15:40

@jokerdino I figured :)

Does anyone here use Brackets?

As in the Web IDE?

jokerdino

yeah

the adobe one

RPi Awesomeness

Yeah, that one. It's pretty good :)

Do you know if people can cooperate on a file?

jokerdino

use github?

Seth

@KasiyA That is a terrible question and not the same thing. You should ask a new one with the right details.

RPi Awesomeness

16:12

@jokerdino You said I can ask you about Javascript, right?

var name = prompt("Enter your chat handle:", "Guest"); means prompt the user for whatever (chat handle in this case) and store that input in the variable name. Is the "Guest" a default that it reverts to if nothing is input?

Seth

16:25

:O read only!

RPi Awesomeness

@Seth Yeah :(

in The Bridge, 11 mins ago, by OKAY, PANIC.

We are about to failover operations to Oregon for read-only mode while we upgrade our core switches in the NY data center.

Tweeted by StackStatus on November 1, 2014 at 4:08 PM

Seth

@RPiAwesomeness w3schools.com/js/tryit.asp?filename=tryjs_prompt

not exactly.

RPi Awesomeness

@Seth Ah. Danke!

Seth

@RPiAwesomeness well at least nothing blew up.

@RPiAwesomeness np.

W3Schools is still a great reference, if you take it with a grain of salt.

RPi Awesomeness

Seth

16:27

MDN is useful, but I've never found it useful as a quick reference.

@RPiAwesomeness yeeeeah.

RPi Awesomeness

PahPEEWWWYAA!

jokerdino

@RPiAwesomeness my JS skills aren't up to scratch. I'm learning it by means of this project too

RPi Awesomeness

@jokerdino Ah :)

Nathan Osman

19:07

I don't want to wait until the last minute. http://t.co/VbifSKRXym

Tweeted by george_the_dev on November 1, 2014 at 7:06 PM

George Edison is back!

Consequently, I've reclaimed my old Twitter handle for my own use.

Seth

Love the typography there.

Nathan Osman

:)

blade19899

19:53

> Pro tip: updating your profile with your name, location, and a profile picture helps other GitHub users get to know you.

Pro tip? Seriously?

I can't even click it away! Goddamn github!

Anyone, help. Please.

Ask Ubuntu Meta

20:40

0

Q: Tiny tweak to the [livedvd] tag

This isn't even worth bringing up in Meta, but if I don't point it out it's going to nag at me in the back of my mind. Observe the following set of tags: live-usb live-cd livedvd If some helpful moderator could change the last tag to add a hyphen (live-dvd), it would save some poor perfectioni...

support tags retag-request

hbdgaf

@NathanOsman You really want an inbox invite? I can ask around. Some people on my list were offering, but I didn't see any particular need.

@RPiAwesomeness Many people started/tried/sort of did. Check over on stackapps or MSO.

What? I was talking to @Takkat about wanting to build something like this over a year ago: mashable.com/2014/10/30/new-project-ara-prototype-works

Nathan Osman

21:03

@hbdgaf :)

hbdgaf

I take it that's a yes?

Nathan Osman

Yes please.

If you can, that's awesome.

If not, thanks so much for trying.

hbdgaf

Do you know how Inbox invites work? Is it just a code to enter to register or is it supposed to map to an email address?

Nathan Osman

21:20

I think it maps to an email address.

hbdgaf

If I can get an invite, I'll ping you on G+ with the "deaddrop email" address/pass, so you can do this and I can give the present more than once

Takkat

@hbdgaf yeah - I read about that - with magnetic attached modules... geeky :)

probably the specs are a bit disappointing.

hbdgaf

@Takkat My initial response when I saw the news story was "Well, I guess it was a good idea..."

Takkat

good ideas always feel better than ideas that became reality (from someone else).

But in case you dropped that thing on the floor you could always reattach the fragments.

Do that with an iThing :D

hbdgaf

3

It looks like they changed from magnetic to slide in during the demo video.

Takkat

21:31

that's a cat's life.

Lego bricks are a boy's best friends... so they will always want their geek stuff to be like it.

<-- has no other reason to always build his boxes himself

hbdgaf

For me, it was more like: "I don't want to choose a full load-out on a phone/tablet. I want to be able to upgrade my storage space and change the wireless or 3g/4g card"

Takkat

yeah, and I was soooo sad to hear that with nowadays mobiles you cant even change the battery.

hbdgaf

Yep.

Takkat

My Samsung needs a full battery removal reset occasionally.

hbdgaf

My nexus used to need a battery reset if it got "too low to realize it was able to charge/charging"

Takkat

21:37

lol

Nathan Osman

I gave my old Samsung to my brother. The battery is removable and wasn't working.

hbdgaf

Yeah, it wasn't like: click the battery out - on the nexus.
It was like: Break out the tweezers and the teensy weensy screwdrivers.

Takkat

Imagine it wasn't removable and not working... that's todays fate of computers 1000 times more powerful than my first.

Battery broke - Smartness gone.... just a dull black piece of plastic.

hbdgaf

That's what I don't understand about colleges teaching hardware repair any more. Most of the time the bench fee and an hour or two gets it to "You're entry price point PC costs less than this."

Nathan Osman

He ordered a replacement and it didn't work either :P

(I ducked out of coverage... in case this is sounding disjointed.)

Takkat

21:43

@hbdgaf that entirely virtual costs... 99% of PC issues are bad configuration or cables. Repaired in a second onec you knew which cable, or settings file.

@NathanOsman replacement batteries of eBay sometimes only look like batteries.

hbdgaf

@Takkat This is true. When I was doing that, I usually did a 5 minute inspection as soon as they brought it in. If I could turn it around in 5 minutes - it was just the bench fee.

Takkat

I once bought 3 different China batteries for my video camera. They all fitted well and looked good. None worked.

Only later I found out, that on this very model of mine some cables were wired differently to take only original batteries.

That's like websites (shops even) refusing to talk with an Ubuntu UA - something I never understood.

hbdgaf

21:59

What? Doesn't everyone have their UA set to '; DROP TABLE Admins; --

I mean, if it works... they probably deserve it.

Takkat

haha - should be like that :)

hbdgaf

Personally, I have mine set to look like the google-bot. That way I don't have to log in to view some forums.

Takkat

Finally my desktop became a heart-lung transplant... I am so disappointed again because there ~~were~~ was only one issue ... eth0 became eth1.

Nothing to tweak or fiddle... it's just the same, only a bit faster.

hbdgaf

I worked an IT shop at one point where one of the bosses asked why the secretary had faster access to quickbooks and his took ages to load. Erm... She's running 100Mb full duplex and you're only running 10Mb half duplex? Seemed obvious to me.

Takkat

Obviously this might be one of the reasons... other reason could be that the secretary only read 10 page books, the boss reads 1000 page books.

hbdgaf

22:07

Heh, No. In this case, I'm referring to a small business and the software quickbooks. He was trying to sync a 300Mb database across a mapped drive on a Windows box.

Ubuntu Questions on U&L

0

Q: Grub 2 - attempting to boot into "Windows bootloader" boots me back into grub

I've managed to dig myself into a bit of a hole. When I boot, I am given the option to boot into Ubuntu or into the Windows bootloader. When I attempt using the windows bootloader, the result is that I am booted back into Grub, at the same menu. Starting about a week ago, I tried installing Ele...

ubuntu windows grub2

Takkat

@hbdgaf syncing over slow nets is no fun.

hbdgaf

22:20

In other news, who knew .py was a valid TLD? You'ld think more python projects would use it?

Takkat

Paraguay makes sense but .pizza is weird.

> The server at takkat.bed can't be found, because the DNS lookup failed.

Anyway I am getting there now.

Goof night.

Transcript for

Ask Ubuntu General Room