M-A's

technology blog

Thursday, 27 August 2009

screen notes

This message is for me only. I don't not expect you learn anything from this or even think this is useful.
C-a means Ctrl-a

Key         | Action           | Notes
C+a c       | new window       |
C+a n       | next window      | I bind F12 to this
C+a p       | previous window  | I bind F11 to this
C+a N       | go to window N   |
C+a "       | window list      | window list is in status line
C+a C+a     | previous window  |
C-a ?       | help             | unbound commands only
C+a :       | screen cmd prompt| up shows last commands
C+a Esc / [ | scrllbck/cpy mode| Enter start and end region
C+a ]       | paste buffer     | Supports pasting between windows
C-U / D     | page up/down     | While in copy mode

Efficient screen workflow:
  • On 2 monitors, start 2 fullscreen ssh sessions
  • Use screen -R -D on the first
  • Use screen -x on the second
You can now use screen as text based window manager. (awesome)

To use screen on the ADP1/G1/N1, use ConnectBot.

Also useful:


# Bind F11 and F12 (NOT F1 and F2) to previous and next screen window 
bindkey -k F1 eval prev fit 
bindkey -k F2 eval next fit 

vim / vimdiff notes

This message is for me only. I don't not expect you learn anything from this or even think this is useful.


Key
Action
Notes
ctrl+w, ctrl+w
switch windows
ctrl-w, J
Move the window down
do
diff obtain
doesn't work in 3-way?
dp
diff put
doesn't work in 3-way?
[c
previous difference
]c
next difference
:diffupdate
diff update
:syntax off
syntax off
zo
open folded text
zc
close folded text
:set paste
Disable auto-indent


v
select text
V
select lines
Ctrl-V
select vertical block
d
cut
y
yank (copy)
p
paste after the cursor
P
paste before the cursor
lv
selects an area equal to the yank buffer
lvp
replace paste
lNNvp
replace paste NN times
*y
yank to system clipboard


But this page is better: http://www.tuxfiles.org/linuxhelp/vimcheat.html
And the real reference: http://www.vim.org/htmldoc/quickref.html#quickref, accessible from inline help.
This one is awesome: http://jmcpherson.org/editing.html

Friday, 12 June 2009

Boris Jabes (MS) told me that Visual Studio macros can be saved as UTF16 text file. I was shocked. How the hell I was ignoring that functionality, but it seems I'm not alone by the sheer number of hits when searching for [vsmproj] on the web (e.g. less than 100 except on Yahoo)

So here's how to convert your binary .vsmacros to utf16 .vsmproj project.

1. Open Macro Explorer in Visual Studio
2. Select a project or create a new one
3. Open the Properties Window (Alt+Enter)
4. In the properties, change the "storage format" from "binary (.vsmacros)" to "text (unicode)"

That is much more useful for sharing macros in a source control.

Archival price

I was considering buying a 50pk 4.5gig DVD spindle. It's ~15.40$ CAD for a good archival quality.
On the other side, a 1.5TB HD is 150$.

15.50$ / (50*4.5gb) = 6.9¢
150$ / 1500gb = 10¢

Taking in account that there's always lost space in DVD due to trying to fit it to its maximum space, the amount of time taken to format the data to fit in a DVD, the manual intervention of swaping the disks and the slow DVD write speed (compared to a SATA2 HD), I think it's not valuable to archive on DVD anymore, assuming you keep 2 copies of your data.

Wednesday, 3 June 2009

Dell mini 10v

Coolness
1) With a 6 cells battery, this thing last a full day!
2) Jaunty supports hibernation, faster boot and *way* faster wifi connection. Hardy was way too slow to connect back to the wifi network.
3) If you take a colored top, you get the webcam for free. Mostly useless on a Atom processor anyway. :)

Issues
1) It took me a day to figure out how to page up/down key; kind of necessary when programming. Hint: FN key.
2) No video acceleration for the 945GME / GMA 950 until Karmic Koala 9.10. This video card is too unstable with UXA to be usable. That's quite disapointing.
3) The touchpad default configuration isn't great, I highly recommend a Logitech Nano VX.
4) With the 6 cells battery, the laptop is not level, making it hard to look at the monitor while the laptop is on a table and you are straight up. This is due to the fact that the monitor doesn't bend backward enough.
5) The dell ubuntu comes with Fluendo codecs and a custom shell launcher. My wife liked the launcher but the one in NBR is fine enough for her. TODO The codecs can be imported back into the new install if you install both OS side by side.

Survival kit
1) Install Ubuntu Jaunty 9.04 netbook remix (NBR). This netbook has a SDHC card reader so you can put it on a memory card from the stock ubuntu install.
2) Fix the palm check otherwise the mouse is constantly moving while typing on the keyboard.
Temporary fix:
DEVICE="SynPS/2 Synaptics TouchPad"
xinput list-props "$DEVICE"
xinput --set-int-prop "$DEVICE" "Synaptics Palm Detection" 8 1
xinput --set-int-prop "$DEVICE" "Synaptics Palm Dimensions" 32 10 10
First modify the file is /usr/share/hal/fdi/policy/20thirdparty/11-x11-synaptics.fdi as explained in:
http://ubuntu-snippets.blogspot.com/2009/03/multi-touch-for-anyall-synaptics.html

You can then install
sudo apt-get install gsynaptics
but it doesn't let you modify every settings..

3) If you kept the stock dell ubuntu 8.04 on a separate partition, fix the grub menu timeout to 1 second
sudo nano /boot/grub/menu.lst
Set the "timeout" line to 1.

4) Install Google Chrome!
http://dev.chromium.org/getting-involved/dev-channel

Update
- Better just turn off the touchpad after all, it's way too bad.
- Go in the bios and fix the Function keys as multimedia keys.
- I installed 2 gigs of RAM in it with the videos on youtube.

Friday, 10 April 2009

Section synchronization

I was looking at a cleaver way to use interprocess communication and we (chromium) use shared memory with CreateFileMapping(). The main issue is synchronization. I was looking at using the section as an inherent synchronization tool but it fails miserably. I finally found the answer: « File mapping objects do not support the SYNCHRONIZE standard access right. »[1]

That would have been useful, even if it would have been limited to 4kb granularity or even just a global section lock. Sad. Going back to mutex. :(

[1]
http://msdn.microsoft.com/en-us/library/aa366559.aspx

EMF buffer idiocracy

On Windows XP, when creating an HDC from an EMF buffer with CreateEnhMetaFile():
  • SetDCBrushColor() and SetDCPenColor() calls are not recorded. Too bad for you.
  • When using GetStockObject(), DC_BRUSH and DC_PEN are useless and will return a white pen and a black pen respectively. Just don't use them.
  • Expect no-op from ExtTextOut(..., ETO_GLYPH_INDEX, ...) if GDI32!GdiInitializeLanguagePack hasn't been called.