Cheetsheet

This is my "cheetsheet" or reference card.
I'll update this post as and when but really its just a place to store the stuff I always forget how to do or the exact syntax involved.

Bash:

For:

for f in dir/file*  do    echo "Processing $f"    # do something on $f  done
for i in {0..10..2}    do echo "Welcome $i times"  done

Ascii dec/hex/binary table

Key:

decimal numbers (base 10) hexadecimal numbers (base 16) ascii character or control code binary digits (base 2). The top table has binary 0 as the first digit, the bottom table has binary 1
The binary numbers across the top are the next most significant digits
The binary numbers down the left side are the final 4 digits
so for example: 182 (B6) has a 1 for the first digit as its in the bottom table, Next look to the top of the column to get 011
and finally look at the row to get 0110
So the entire sequence is 10110110

 

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

000

000�

101

202

303

404

505

606

707

808

909

100A

110B

120C

130D

140E

150F

001

1610

1711

1812

1913

2014

2115

2216

2317

2418

2519

261A

271B

281C

291D

301E

311F

010

3220

3321!

3422"

3523#

3624$

3725%

3826&

3927'

4028(

4129)

422A*

432B+

442C,

452D-

462E.

472F/

011

48300

49311

50322

51333

52344

53355

54366

55377

56388

57399

583A:

593B;

603C<

613D=

623E>

633F?

100

6440@

6541A

6642B

6743C

6844D

6945E

7046F

7147G

7248H

7349I

744AJ

754BK

764CL

774DM

784EN

794FO

101

8050P

8151Q

8252R

8353S

8454T

8555U

8656V

8757W

8858X

8959Y

905AZ

915B[

925C\

935D]

945E^

955F_

110

9660`

9761a

9862b

9963c

10064d

10165e

10266f

10367g

10468h

10569i

1066Aj

1076Bk

1086Cl

1096Dm

1106En

1116Fo

111

11270p

11371q

11472r

11573s

11674t

11775u

11876v

11977w

12078x

12179y

1227Az

1237B{

1247C|

1257D}

1267E~

1277F

 

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

12880€

12981

13082‚

13183ƒ

13284„

13385…

13486†

13587‡

13688ˆ

13789‰

1388AŠ

1398B‹

1408CŒ

1418D

1428EŽ

1438F

14490

14591‘

14692’

14793“

14894”

14995•

15096–

15197—

15298˜

15399™

1549Aš

1559B›

1569Cœ

1579D

1589Ež

1599FŸ

160A0 

161A1¡

162A2¢

163A3£

164A4¤

165A5¥

166A6¦

167A7§

168A8¨

169A9©

170AAª

171AB«

172AC¬

173AD­

174AE®

175AF¯

176B0°

177B1±

178B2²

179B3³

180B4´

181B5µ

182B6¶

183B7·

184B8¸

185B9¹

186BAº

187BB»

188BC¼

189BD½

190BE¾

191BF¿

192C0À

193C1Á

194C2Â

195C3Ã

196C4Ä

197C5Å

198C6Æ

199C7Ç

200C8È

201C9É

202CAÊ

203CBË

204CCÌ

205CDÍ

206CEÎ

207CFÏ

208D0Ð

209D1Ñ

210D2Ò

211D3Ó

212D4Ô

213D5Õ

214D6Ö

215D7×

216D8Ø

217D9Ù

218DAÚ

219DBÛ

220DCÜ

221DDÝ

222DEÞ

223DFß

224E0à

225E1á

226E2â

227E3ã

228E4ä

229E5å

230E6æ

231E7ç

232E8è

233E9é

234EAê

235EBë

236ECì

237EDí

238EEî

239EFï

240F0ð

241F1ñ

242F2ò

243F3ó

244F4ô

245F5õ

246F6ö

247F7÷

248F8ø

249F9ù

250FAú

251FBû

252FCü

253FDý

254FEþ

255FFÿ

For a more complete Ascii table, look here

Binding a datagridview to a list

Ok, so binding a grid to a list is easy, but what if you want changes in the list to be shown in the grid?
Well actually, it turns out, this is easy too - just not obvious.

Instead of using System.Collections.Generic.List<T>
use System.ComponentModel.BindingList<T>
It's exactly the same in all important regards, but it has the methods necessary for the grid to know that the list has changed

Easy huh!

Editing xml in vim

Yes, I use vim!

And large html, xml and xsl documents can be frustrating so here are a few things I sussed out today to make it easier:

1. None of the commandline tools I could find were capable of cleanly formatting an xml document and putting comments in the correct alignment. All of them put the comments with no indentation.
   Some of you may prefer this but it stosp the following tips from working correctly in vim
   So I wrote a quick 5 min tool to do this, and here it is.
   Extract that archive somewhere into your path and then simply cat unformatted.xml | xmltidy > formatted.xml
   easy :)
   N.B. You'll need to have mono installed.
2. Next I've assigned this new tool to an easy key in vim
   In your .vimrc file enter the following:
   :map <F2> :1,$!xmltidy<Enter>
   You can use any key you like of course
3. Next I enabled code-folding
   Now there are plenty of posts out on the web about getting code folding with xml to work however I had issues with all of them.
   What I found to work was to enable folding by indentation (hence why comments have to be in the correct alignment).
   These 2 lines of vimrc sorted that out for me:
   au FileType htm,html,xml.xsl,xslt exe ":set foldmethod=indent"
au BufNewFile,BufRead *.htm,*.html,*.xml,*.xsl,*.xslt exe ":set shiftwidth=2"
   N.B. I have my tabstop set to 2 so that pressing the tabkey indents the line by 2 columns instead of the usual 
4.  Finally; if, like me, you don't like that ugly banner on the code folding lines then you'll want to change the colours with this line:
   :highlight Folded ctermbg=black

Having enabled the code folding you can use zo and zc to open and close a fold respectively.
N.B. when folding it folds everything at that level, not everything that is a child.
In other words if you had this document:
<xml>   <node1>     <node1a/>     <node1b/>   </node1>   <node2>     <node2a/>     <node2b/>   </node2> </xml>
and you press zc when the cursor is on the line with node1 then rather than hiding node1a and node1b like you might expect - it hides node1 and node2 (as well as their children)
 

Distinct in XSL

So I frequently have a need to do this but I can never remember how, so I figure why not use my shiny new blog and write about it here!

The problem:

• You have some node list which contains many, many items.
• You want to group items based on part of their content
• You want to do it in xsl

Example:
The xml:
<phrases>   <node type="Greeting">Hello</node>   <node type="Farewell">Goodbye</node>   <node type="Greeting">Hi</node>   <node type="Greeting">Howdy</node>   <node type="Farewell">See you later</node> </phrases>
the result:
Greeting Farewell
The solution:
You can use the generate-id() function.
This function is part of xsl so you don't need any funky includes, but it means you can't use it from XPath (e.g. from C#'s SelectNodes() method)

<xsl:if test="generate-id(.) = generate-id(../node[@type=current()/@type])>   <xsl:value-of select="."/> </xsl:if>

And that's it!
Let's break it down

• generate-id(.)
  Does exactly what you might expect i.e. it generates a unique ID which represents the current node. Calling generate-id on the same node twice will return the same id.
• ../node[@type=current()/@type]
  This bit gets all the other nodes which have the same value based on the key we are grouping by (in this case

Visit my webites

As well as this blog I have 2 main websites currently.

• My DJing website; where you can download plenty of my mixes:
  http://www.dj-djl.com 

• My development website which lists the personal software projects I have developed
  http://dev.dj-djl.com

I've also got a new site, still under construction dedicated to the radio switcher project which has been my main focus of late.
http://dev.dj-djl.com/radioswitcher.aspx

When this project goes live I will probably give it its own domain name

Welcome to my blog

I've just created this blog today so bare with me while the content slowly builds!
I guess the idea behind this blog is to share some of the cool things I've done or discovered in the development world.
Hopefully someone somewhere will find it useful!