Dev Notes: February 2013

Tuesday, February 26, 2013

media queries for standard devices

http://css-tricks.com/css-media-queries/
http://css-tricks.com/snippets/css/media-queries-for-standard-devices/

/* Smartphones (portrait and landscape) ----------- */
@media only screen 
and (min-device-width : 320px) 
and (max-device-width : 480px) {
/* Styles */
}

/* Smartphones (landscape) ----------- */
@media only screen 
and (min-width : 321px) {
/* Styles */
}

/* Smartphones (portrait) ----------- */
@media only screen 
and (max-width : 320px) {
/* Styles */
}

/* iPads (portrait and landscape) ----------- */
@media only screen 
and (min-device-width : 768px) 
and (max-device-width : 1024px) {
/* Styles */
}

/* iPads (landscape) ----------- */
@media only screen 
and (min-device-width : 768px) 
and (max-device-width : 1024px) 
and (orientation : landscape) {
/* Styles */
}

/* iPads (portrait) ----------- */
@media only screen 
and (min-device-width : 768px) 
and (max-device-width : 1024px) 
and (orientation : portrait) {
/* Styles */
}

/* Desktops and laptops ----------- */
@media only screen 
and (min-width : 1224px) {
/* Styles */
}

/* Large screens ----------- */
@media only screen 
and (min-width : 1824px) {
/* Styles */
}

/* iPhone 4 ----------- */
@media
only screen and (-webkit-min-device-pixel-ratio : 1.5),
only screen and (min-device-pixel-ratio : 1.5) {
/* Styles */
}

pass parameters to an xslt transform using nokogiri

you need to supply an array of specially quoted key value pairs:

      # transformer needs a doc
      doc_from_xml_hunk = Nokogiri::XML(examquestion.to_xml)

      # do the transformation, passing some params
      #pass an array of key value pairs, quoted for stylesheet safety
      ary = Nokogiri::XSLT.quote_params([
        'message', 'hello world',
        'message2', 'hello again'
        ])
      puts xslt.transform(doc_from_xml_hunk, ary) # [, xslt_parameters]

in the stylesheet, you define the params at the global level, then access them using the '$' notation.


<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="html">

<xsl:param name="message"></xsl:param>
<xsl:param name="message2"></xsl:param>

<!-- RULE FOR EXAMQUESTION -->
<xsl:template match="examquestion">
<xsl:text disable-output-escaping="yes">&lt;!doctype html&gt;</xsl:text> 
<html lang="en">
<head>
 <xsl:text disable-output-escaping="yes">&lt;meta charset="utf-8"&gt;</xsl:text>
  <title>Document</title>
</head>
<body>
 <h3>
<xsl:value-of select="$message"></xsl:value-of></h3>
<xsl:value-of select="$message2"></xsl:value-of><br />

</body>
</html>
</xsl:template>
</xsl:output></xsl:stylesheet></pre>

Monday, February 25, 2013

transform an xml hunk using nokogiri

#!/usr/bin/env ruby
# encoding: utf-8
require "nokogiri"

filename = "study-OEG-P10Ch02.xml" 

f = File.open(filename)
doc = Nokogiri::XML(f)
f.close

xslt  = Nokogiri::XSLT(File.read('transform.xsl'))

doc.xpath('Root/chapter').each do |chapter|
  chapter_title = chapter.at_xpath('title').text   #like: puts chapter.xpath('title').first.text
  puts chapter_title

  chapter.xpath('section').each { |section|
    section_title = section.at_xpath('title').text
    puts section_title

    section.xpath('examquestion').each { |examquestion|
      # transformer needs a doc
      doc_from_xml_hunk = Nokogiri::XML(examquestion.to_xml)

      # do the transformation
      # puts xslt.transform(doc_from_xml_hunk) # [, xslt_parameters]
    }
  }
end

Sunday, February 24, 2013

parse an xml file with nokogiri, traverse with xpath

#!/usr/bin/env ruby
# encoding: utf-8
require "nokogiri"

filename = "study-OEG-P10Ch02.xml" 

f = File.open(filename)
doc = Nokogiri::XML(f)
f.close

doc.xpath('Root/chapter').each do |chapter|
  # puts chapter
  chapter_title = chapter.at_xpath('title').text   #like: puts chapter.xpath('title').first.text
  puts chapter_title

  chapter.xpath('section').each { |section|
    section_title = section.at_xpath('title').text
    puts section_title

    section.xpath('examquestion').each { |examquestion|
      puts "examquestion"
    }
  }
end

Saturday, February 23, 2013

parse an xml file with rexml, traverse with xpath

#!/usr/bin/env ruby
# encoding: utf-8
require "rexml/document"

filename = "study-OEG-P10Ch02.xml" 
file = File.new( filename )
doc = REXML::Document.new file

doc.elements.each("Root/chapter") { |chapter_element| 
  chapter_title = chapter_element.elements["title"].text
  puts 'chapter_title=' + chapter_title.inspect

  chapter_element.elements.each("section") { |section|
    section_title = section.elements["title"].text
    puts 'section_title=' + section_title.inspect

    section.elements.each("examquestion") { |examquestion|
      puts 'examquestion'
    }
  }
}

list power management settings with pmset -g

[smr@macpro ~]$ pmset -g
Active Profiles:
AC Power  -1*
Currently in use:
 hibernatemode        0
 womp                 1
 networkoversleep     0
 sleep                0
 powerbutton          0
 ttyskeepawake        1
 hibernatefile        /var/vm/sleepimage
 autorestart          0
 disksleep            30
 displaysleep         15

Friday, February 22, 2013

create xml with Nokogiri::XML::Builder

#!/usr/bin/env ruby

require 'nokogiri'

# When the builder is supplied with a block that has a parameter, the outside
# scope is maintained. This means you can access variables that are outside
# your builder.
my_var = 999

builder = Nokogiri::XML::Builder.new do |xml|
xml.document {  # root node can be named whatever
  xml.widgets {
    (1..7).each { |i|
      xml.widget(attr1:"value #{i}") {
        # use an underscore to disambiguate your tag name from the method call.
        xml.id_ "widget #{i}" 
        xml.name "Awesome widget"
        xml.somevalue my_var
      }
    }
  }
}
end
puts builder.to_xml

reinstall nokogiri after mountain lion upgrade

sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2
gem uninstall nokogiri libxml-ruby
brew update
brew uninstall libxml2
brew install libxml2 --with-xml2-config
brew install libxslt
gem install nokogiri -- --with-xml2-include=/usr/local/Cellar/libxml2/2.9.0/include/libxml2 --with-xml2-lib=/usr/local/Cellar/libxml2/2.9.0/lib --with-xslt-dir=/usr/local/Cellar/libxslt/1.1.28/

install log

note the nokogiri reference in the 'brew install libxslt' output

[smr@macpro nokogiri-builder]$ brew install libxml2 --with-xml2-config
==> Downloading ftp://xmlsoft.org/libxml2/libxml2-2.9.0.tar.gz
######################################################################## 100.0%
######################################################################## 100.0%==> Downloading patches
######################################################################## 100.0%
######################################################################## 100.0%
==> Patching
patching file threads.c
patching file xpath.c
==> ./configure --prefix=/usr/local/Cellar/libxml2/2.9.0 --without-python
==> make
==> make install
==> Caveats
This formula is keg-only: so it was not symlinked into /usr/local.

Mac OS X already provides this software and installing another version in
parallel can cause all kinds of trouble.

Generally there are no consequences of this for you. If you build your
own software and it requires this formula, you'll need to add to your
build variables:

LDFLAGS: -L/usr/local/opt/libxml2/lib
CPPFLAGS: -I/usr/local/opt/libxml2/include

==> Summary
🍺 /usr/local/Cellar/libxml2/2.9.0: 273 files, 11M, built in 56 seconds
[smr@macpro nokogiri-builder]$ brew install libxslt
==> Downloading ftp://xmlsoft.org/libxml2/libxslt-1.1.28.tar.gz
######################################################################## 100.0%
######################################################################## 100.0%==> ./configure --prefix=/usr/local/Cellar/libxslt/1.1.28 --with-libxml-prefix=/usr/local/Cellar/libxml2/2.9.0
==> make
==> make install
==> Caveats
To allow the nokogiri gem to link against this libxslt run:
gem install nokogiri -- --with-xslt-dir=/usr/local/Cellar/libxslt/1.1.28

This formula is keg-only: so it was not symlinked into /usr/local.

Mac OS X already provides this software and installing another version in
parallel can cause all kinds of trouble.

Generally there are no consequences of this for you. If you build your
own software and it requires this formula, you'll need to add to your
build variables:

LDFLAGS: -L/usr/local/opt/libxslt/lib
CPPFLAGS: -I/usr/local/opt/libxslt/include

==> Summary
🍺 /usr/local/Cellar/libxslt/1.1.28: 145 files, 3.3M, built in 39 seconds

Thursday, February 21, 2013

Disable the annoying key repeat limitation in mountain lion

Disable repeat limitations
While the default behavior in OS X is to prevent these key repeats, you can revert this behavior permanently by issuing the following command in the Terminal, and then logging out and logging back in to your account:

defaults write -g ApplePressAndHoldEnabled -bool false

The "defaults" command is used to manage preference files (aka the Defaults system in OS X). Here we've told it to "write" and have specified the "-g" flag for the hidden global preferences file instead of specifying a program domain such as com.apple.TextEdit for Apple's TextEdit program (which would write to the com.apple.TextEdit.plist file). We've then told it to create or modify the ApplePressAndHoldEnabled setting, and change its Boolean value (yes or no, on or off, true or false) to false, thereby disabling this setting. To re-enable this setting, just repeat the command in the Terminal and replace "false" with "true."

set the hard drive sleep time on the command line

http://reviews.cnet.com/8301-13727_7-10346924-263.html

When this setting is enabled, the system changes the power management system to turn off the disks after 10 minutes of use. When the option is unchecked, the disks are set to never turn off. Despite the limits in the control panel, this behavior can be changed manually, by using the "pmset" command in Terminal. The command alters the power management settings, giving users fine-tune control of the disk sleep settings. It also can set the display and system sleep times (though, the sliders work pretty well for those), and what behaviors will cause the computer to sleep and wake (lid opening, wake-on-LAN magic packet via Ethernet, and so on). For specific information on using this command, review its manual page on it by typing "man pmset" in the Terminal.

To adjust the disk's sleep time, enter the following command in the Terminal (Note: for 10.4 users, "disksleep" will be "spindown"):

sudo pmset -a disksleep VALUE

sudo pmset -a disksleep 20

In this command, VALUE is the number of minutes after which the drives will spin down (with "0" being "never"). The "-a" flag applies the setting to all power configurations (battery, wall power, and UPS). To specify only one of these configurations, change the "-a" (indicating "All") to one of the following: "-b" for battery, "-c" for charger or wall power, "-u" for UPS.

sublime text: show the full path of the currently active document

tasty preference: show the full path of the currently active document in the window title bar.

  "show_full_path": true,

jquery on block that handles UIWebView touchstart and touchend events

  $("#answer_button").on({
    //UIWebView
    touchstart: function() {
      $(this).addClass('btn-active');
    },
    touchend: function() {
      $(this).removeClass('btn-active');
    },
    mousedown: function() {
      $(this).addClass('btn-active');
    },
    mouseup: function() {
      $(this).removeClass('btn-active');
    }
  });

Wednesday, February 20, 2013

upload bulk iOS device UDIDs

tab-delimited text file
first row is a header

http://stackoverflow.com/questions/1341472/anyone-tried-to-bulk-upload-device-udids-to-the-iphone-dev-portal

# the first line is ignored
device_id_hex_40_chars    description_text
...                       ...

remove the annoying auto-correct spelling feature in OSX mountain lion

Tuesday, February 19, 2013

create a SASS build system for sublime text

the build systems mimics this command line:

sass --update oeg.scss:oeg.css --stop-on-error --no-cache --compass

/Users/smr/Library/Application Support/Sublime Text 2/Packages/SASS Build/SASS-with-compass-SMR.sublime-build

{

  "cmd": ["sass", "--update", "$file:${file_path}/${file_base_name}.css", "--stop-on-error", "--no-cache", "--compass"],
  "selector": "source.sass, source.scss",
  "line_regex": "Line ([0-9]+):",

  "osx":
  {
    "path": "/usr/local/bin:$PATH"  // home brew path?
  },

  "windows":
  {
    "shell": "true"
  }

}

the use of --compass allows you to @include compass helpers like:

body {
  background-color: #0b3253;
  @include filter-gradient(#0b3253, #56a3e5, vertical);
  @include background-image(linear-gradient(top,  #0b3253 0%,#56a3e5 100%));
}

Monday, February 18, 2013

force a toolbar to have flexible height

if you want the toolbar height to change in landscape mode, you have to:

do toolbar.autoresizingMask = toolbar.autoresizingMask | UIViewAutoresizingFlexibleHeight; programmatically as Interface Builder doesn't allow you to change the flexible height!

http://stackoverflow.com/questions/5219833/uitoolbar-height-on-device-rotation

copy a file with FileUtils.cp

#!/usr/bin/env ruby

require 'fileutils'

FileUtils.cp 'oeg-private.db', '../../source/oeg'

load a webview with a string, specifying base url

    NSURL *baseURL = [[NSURL alloc] initFileURLWithPath:CONTENT_PATH];
    [self.webview loadHTMLString:html baseURL:baseURL];

get the path to the documents directory

+ (NSString *)pathToDocumentsDirectory; {
    //get the path to the docs directory
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    return documentsDirectory;
}

add a GCC_PREPROCESSOR_DEFINITIONS value to define a target-specific build variable

you can then use these values in conditional compilation statements like:

#ifdef ASA_ATP
 [paths addObject:[resourcePath stringByAppendingPathComponent:@"atp_01_2013.db"]];
#endif 
 
#ifdef ASA_CFI
 [paths addObject:[resourcePath stringByAppendingPathComponent:@"cfi_01_2013.db"]];
#endif

load a UIWebView with content from a file in the bundle

- (void)viewDidLoad {
    [super viewDidLoad];

    // load html content from file in bundle
    NSString *path = [CONTENT_PATH stringByAppendingPathComponent:@"help_iphone.html"];
    NSURL *fileURL = [[[NSURL alloc] initFileURLWithPath:path] autorelease];
    NSURLRequest *req = [NSURLRequest requestWithURL:fileURL];
    [self.webview loadRequest:req];

    self.navigationController.toolbarHidden = YES;
}

Sunday, February 17, 2013

navigate the sublime text sidebar with arrow keys

The sidebar can be navigated with the arrow keys, but first you need to give it the input focus by pressing Ctrl+0. To return input focus to the buffer, press Esc.

open a preferences pane from the command line

open /System/Library/PreferencePanes/UniversalAccessPref.prefPane

Friday, February 15, 2013

resolve a sublime text SASS build system issue

the SASS build system was failing on a file that had a method with variable arguments:

// border-radius: top-left top-right bottom-right bottom-left using variable
// arguments. note that when using this approach commas are not used to
// separate the arguments when calling the mixin
@mixin border-radius($radii...) {
  -webkit-border-radius: $radii;
  -moz-border-radius: $radii;
  border-radius: $radii;
}

fiddling with the command showed that it was pointing to an older version of sass for some reason.
forced its hand by using a path to a specific version of SASS:

{
    // "cmd": ["sass", "--watch", ".:."],  //broken
    // "cmd": ["sass", "--version"],  //show me the version
    // "cmd": ["/Users/smr/.rvm/gems/ruby-1.9.2-p320@rails3/bin/sass", "--version"],
    "cmd": ["/Users/smr/.rvm/gems/ruby-1.9.2-p320@rails3/bin/sass", "--watch", ".:."],
    "working_dir": "$file_path",
    "selector": "source.sass"
}

keymando command to open a folder location in terminal using osascript

# open dbeditor project folder in terminal
command "dbeditor dir in terminal" do
  system("/usr/bin/osascript", 
    "-e", %q(tell application "Terminal" to activate),
    "-e", %q(tell application "System Events" to tell process "Terminal" to keystroke "n" using command down),
    "-e", %q(tell application "Terminal" to do script "cd /Users/smr/current_projects/prepware-questions-app/db-editor/" in selected tab of the front window)
  )
end

applescript to tell terminal to open a new window and cd to a directory

http://stackoverflow.com/questions/7171725/open-new-terminal-tab-from-command-line-mac-os-x

long-winded but it works

/usr/bin/osascript -e 'tell application "Terminal" to activate' -e 'tell application "System Events" to tell process "Terminal" to keystroke "n" using command down' -e 'tell application "Terminal" to do script "cd /Users/smr/current_projects/prepware-questions-app/db-editor/" in selected tab of the front window'

extract text from a pdf using a ruby script

use the PDF::Reader module:
https://github.com/yob/pdf-reader

#!/usr/bin/env ruby
# coding: utf-8
# usage:
# ./00-extract-text.rb 00-pdf/*.pdf

# require 'rubygems'
require 'pdf/reader'


ARGV.each do|pdf_filename|
  puts "processing #{pdf_filename}"

  path = File.expand_path(File.dirname(__FILE__)) + "/#{pdf_filename}"
  # puts path

  PDF::Reader.open(path) do |reader|
    contents = ""
    reader.pages.each do |page|
      contents += page.text
    end

    # save string to a file.
    basename = File.basename(path, ".pdf")
    aFile = File.new("01-text-pre-cleanup/#{basename}.txt", "w")
    aFile.write(contents)
    aFile.close
  end

end

Thursday, February 14, 2013

open a sublime text project using a keymando custom command

this allows you to open a project using mnemonics instead of hunting through the file system.

# open the dbeditor project in sublime text
# note that you have to use the full path to the subl command (which is itself a sym link)
command "dbeditor" do
  system("/Users/smr/bin/subl", "/Users/smr/current_projects/prepware-questions-app/db-editor")
end

prepareForSegue for a table row click

when using storyboards, pass info between scenes using:
prepareForSegue:sender:

note that we aren't using:
tableView:didSelectRowAtIndexPath:
which is the typical approach when not using segues.

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // get the selected table row.
    UITableViewController *tvc = segue.sourceViewController;
    UITableView *tv = (UITableView *)tvc.view;
    NSIndexPath *indexPath = [tv indexPathForSelectedRow];
 if (indexPath != NULL)
 {
        // pass a data object or something
    }
}

Wednesday, February 13, 2013

custom view that draws a linear gradient

http://smr.prepware.com.s3.amazonaws.com/simple-examples/ios/gradient-view.zip

//  FMIGradientView.m

#import "FMIGradientView.h"
#import "AppTypeDefs.h"

@implementation FMIGradientView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}


// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    //draw a gradient
    CGContextRef currentContext = UIGraphicsGetCurrentContext();

    CGGradientRef glossGradient;
    CGColorSpaceRef rgbColorspace;

    // 2 locations
    size_t num_locations = 2;
    CGFloat locations[2] = { 0.5, 1.0 };
//    CGFloat components[8] = {
//        90.0/255.0, 166.0/255.0, 231.0/255.0, 1.0,
//        11.0/255.0, 50.0/255.0, 83.0/255.0, 1.0
//    };
    CGFloat components[8] = GRADIENT_COMPONENTS;


    rgbColorspace = CGColorSpaceCreateDeviceRGB();
    glossGradient = CGGradientCreateWithColorComponents(rgbColorspace, components, locations, num_locations);

    CGRect currentBounds = self.bounds;
    CGPoint topCenter = CGPointMake(CGRectGetMidX(currentBounds), 0.0f);
    CGPoint bottomCenter = CGPointMake(CGRectGetMidX(currentBounds), CGRectGetMaxY(currentBounds));
    CGContextDrawLinearGradient(currentContext, glossGradient, topCenter, bottomCenter, 0);
    
    CGGradientRelease(glossGradient);
    CGColorSpaceRelease(rgbColorspace);
}
@end

Tuesday, February 12, 2013

create a read-only private property in Objective-C

@interface FMIModelController()
@property (readonly, strong, nonatomic) NSArray *pageData;
@end

using submodules in a git repository

If while working on one project, you need to use another project from within it, use submodules.
See: http://git-scm.com/book/en/Git-Tools-Submodules for details.

everything works pretty much as expected.

you can add a submodule, which amounts to pulling the contents of another repo into a project subfolder. the two repos are tracked separately.

the one semi-quirky thing is if you do a new clone of a repo that contains submodules, the submodule directories are initially empty. you have to run a couple of commands to populate them:

$ git submodule init 
$ git submodule update

Monday, February 11, 2013

unhide the library folder in OS X 10.7/10.8


chflags nohidden /Users/[username]/Library/

implement a private property using an interface

@interface FMIViewController ()
@property (readonly, strong, nonatomic) FMIModelController *modelController;
@end

create a view controller form a storyboard scene

// create a view controller
FMIDataViewController *startingViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"FMIDataViewController"];

distinguish between multiple UIStoryboardSegues using the identifier property

set the identifier for the segue in Interface Builder (or programmatically).

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    NSLog(@"%s", __FUNCTION__);
    NSLog(@"%@", segue.sourceViewController);
    NSLog(@"%@", segue.destinationViewController);
    
    if ([segue.identifier isEqualToString:@"SegueFromButtonPush"]) {
        NSLog(@"SegueFromButtonPush");
    }
}

Sunday, February 10, 2013

create rounded corners and a drop shadow on a UIView

- (void)viewDidLoad
{
    [super viewDidLoad];
 // Do any additional setup after loading the view, typically from a nib.
    // see the CALayer Class Reference for details
    UIView *v = self.view;
    [v.layer setCornerRadius:20.0f];
    
//    [v.layer setBorderColor:[UIColor lightGrayColor].CGColor];
//    [v.layer setBorderWidth:1.5f];
//    [v.layer setShadowColor:[UIColor blackColor].CGColor];
//    
//    [v.layer setShadowOpacity:0.8];
//    [v.layer setShadowRadius:3.0];
//    
//    [v.layer setShadowOffset:CGSizeMake(2.0, 2.0)];
}

check for portrait orientation on an iOS device

use UIInterfaceOrientationIsPortrait(orientation)

if (UIInterfaceOrientationIsPortrait(orientation) || ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)) {
    //...
}

Saturday, February 9, 2013

paste a hunk of text using a keymando command

command "ppd prettyprint div" do
  # copy a hunk of text to the clipboard (pipe to pbcopy)
  `echo '<pre class="prettyprint">\n</pre>
' | pbcopy`
  # paste it by sending cmd-v to the app
  send("")
end

ruby script to generate normal and 2x placeholder images for iOS development

/Users/smr/bin/placeholder

#!/usr/bin/env ruby
# generate placeholder graphics using http://placehold.it/
if ARGV.length > 1
  # the normal version
  w = ARGV[0]
  h = ARGV[1]
  `wget http://placehold.it/#{w}x#{h}.png`

  # the 2x scaled version for retina displays
  w_doubled = Integer(w) * 2
  h_doubled = Integer(h) * 2
  `wget http://placehold.it/#{w_doubled}x#{h_doubled}.png --output-document=#{w}x#{h}@2x.png`
end

access command line arguments in ruby

#!/usr/bin/env ruby

ARGV.each do|a|
  puts "Argument: #{a}"
end

make a system call in a custom keymando command

# same as a ruby system call
# place call in backticks
command "sys call test" do
  # `osascript -e 'set volume output volume (output volume of (get volume settings) + 7)'`
  `say 'hello world'`
  # these work too:
  # system("say 'hello world'")
  # system("say", 'hello world')
end

iOS - customize the title of the back button

- (void)viewDidLoad
{
  [super viewDidLoad];
  // Do any additional setup after loading the view.
    
  // we want the back button to have a title of "Back" and not one derived
  // from the title of the previous view contoller on the nav stack
  self.navigationItem.backBarButtonItem =
  [[UIBarButtonItem alloc] initWithTitle:@"Back"
             style: UIBarButtonItemStyleBordered
            target:nil
            action:nil];
}

generate placeholder graphics using http://placehold.it/

http://placehold.it/

you can specify size (WxH) and format like:
http://placehold.it/350x150.png

using wget for this task is handy if you want to generate a file straightaway.

Friday, February 8, 2013

Hide a toolbar/navbar in iOS

toolbar

// in a UIViewController subclass
- (void)viewWillAppear:(BOOL)animated {
    [self.navigationController setToolbarHidden:NO animated:YES];
    [super viewWillAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated {
    [self.navigationController setToolbarHidden:YES animated:YES];
    [super viewWillDisappear:animated];
}

navbar

// in a UIViewController subclass
- (void)viewWillAppear:(BOOL)animated {
    [self.navigationController setNavigationBarHidden:YES animated:NO];
    [super viewWillAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated {
    [self.navigationController setNavigationBarHidden:NO animated:NO];
    [super viewWillDisappear:animated];
}

sublime text - move lines keyboard shortcut

Move lines of code up and down

Shortcut for moving line up: Ctrl + ⌘ + ↑

Shortcut for moving line down: Ctrl + ⌘ + ↓

Sometimes a line of code is in the wrong place. Instead of selecting, copying, deleting and pasting it to the desired place, Sublime Text 2 allows you to move the current line up and down with shortcuts. This also works with several selected lines.

ruby shebang line with RVM

#!/usr/bin/env ruby

Thursday, February 7, 2013

using google code prettify for syntax highlighting with Blogger

experiment with using google code prettify to do syntax highlighting for source code snippets.

for details see:
http://stackoverflow.com/questions/1852537/how-to-use-prettify-with-blogger-blogspot
and
http://notepad2.blogspot.com/2012/05/use-google-code-prettify-in-blogger.html

Objective-C

int foo=0;
NSLog(@"%i", foo);

Ruby

#create a zip file
sourcefolder = File.join(Rails.root, 'tmp', V11_FOLDERNAME)  #the source folder
zipfile_name = File.join(Rails.root, 'tmp', V11_FOLDERNAME, 'databases_v11.zip')

#delete any existing zip file
begin
   File.delete(zipfile_name)
rescue Errno::ENOENT
end

Zip::ZipFile.open(zipfile_name, Zip::ZipFile::CREATE) do |zipfile|
  input_filenames.each do |filename|
    # Two arguments:
    # - The name of the file as it will appear in the archive
    # - The original file, including the path to find it
    zipfile.add(filename, sourcefolder + '/' + filename)
  end
end

send_file(zipfile_name, type: "application/zip", disposition: 'attachment')

setup

to make this work, edit your site template (Design > Edit HTML) and add these lines before the closing head tag:

<link href='http://google-code-prettify.googlecode.com/svn/trunk/src/prettify.css' rel='stylesheet' type='text/css'/>
<script language='javascript' src='http://google-code-prettify.googlecode.com/svn/trunk/src/prettify.js' type='text/javascript'/>
<script language='javascript' src='http://google-code-prettify.googlecode.com/svn/trunk/src/lang-css.js' type='text/javascript'/>

and add this to the body tag attributes:

onload='prettyPrint()'

usage

wrap your code in pre blocks like this:

<pre class="prettyprint">
int foo=0;
NSLog(@"%i", foo);
</pre>