Johan Kiviniemi’s series of tubes

“Discovering a World of Resources on Rails”

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// “digg it” button.
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// Load Google Analytics.
$.loadGoogleAnalytics ('UA-0123456-1');

% sudo wget -O /etc/apt/sources.list.d/medibuntu.list \
    http://www.medibuntu.org/sources.list.d/jaunty.list
% sudo apt-get update; \
    sudo apt-get install medibuntu-keyring; \
    sudo apt-get update

CONTROL_HD_IDLE_TIMEOUT=1

LM_BATT_HD_IDLE_TIMEOUT_SECONDS=60
LM_AC_HD_IDLE_TIMEOUT_SECONDS=7200
NOLM_HD_IDLE_TIMEOUT_SECONDS=7200

CONTROL_HD_POWERMGMT=1

BATT_HD_POWERMGMT=128
LM_AC_HD_POWERMGMT=254
NOLM_AC_HD_POWERMGMT=254

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
  <match target="font">
    <edit name="antialias" mode="assign"><bool>true</bool></edit>
    <edit name="hinting" mode="assign"><bool>true</bool></edit>
    <edit name="hintstyle" mode="assign"><const>hintfull</const></edit>
    <edit name="lcdfilter" mode="assign"><const>lcdlegacy</const></edit>
    <edit name="rgba" mode="assign"><const>rgb</const></edit>
  </match>
</fontconfig>

Xft.antialias:  true
Xft.hinting:    true
Xft.hintstyle:  hintfull
Xft.lcdfilter:  lcdlegacy
Xft.rgba:       rgb

% time svn diff -r 706 >/dev/null
svn diff -r 706 > /dev/null  0.40s user 0.14s system 1% cpu 42.378 total

% time git diff $(git svn find-rev r706) >/dev/null
git diff $(git svn find-rev r706) > /dev/null  0.19s user 0.04s system 85% cpu 0.276 total

% time git diff $(git svn find-rev r29) >/dev/null
git diff $(git svn find-rev r29) > /dev/null  0.38s user 0.04s system 95% cpu 0.434 total

what = what_new (sprintf ("Checking filesystem %s", devname));

answer = what_choice (what, "Will you marry me?",
                      WHAT_YES, WHAT_NO, "Never!");

question_handle = what_input_nonblock (what, my_callback, my_data,
                                       "What's bothering you?", "");

/sbin/what choice "jackbauerd" "The mainframe matrix has been backtraced
    in order to enhance the subnet node. How should I proceed?" \\
    "Access the protocol stream" "Engage the socket firewall"

┌────────────────────────────────────────────────────────────────────────────┐
│ Distro branding, blahblah                                                  │
├────────────────────────────────────────────────────────────────────────────┤
│ Checking filesystem /dev/sda1                                              │
│ [#############################                                     ] 43.9% │
│ Do you want set inode 12765 on fire?  [ OK ] [ Cancel ]                    │
├────────────────────────────────────────────────────────────────────────────┤
│ Checking filesystem /dev/sdb1                                              │
│ [###########                                                       ] 16.7% │
├────────────────────────────────────────────────────────────────────────────┤
│ Test entry with a pulsating (moving back and forth) progress bar           │
│ [                                            ########                    ] │
│ What's your social security number? ______________________________________ │
│                                                                            │
│                                                                            │
│                                                                            │
│                                                                            │
│                                                                            │
│                                                                            │
│                                                                            │
│                                                                            │
│                                                                            │
└────────────────────────────────────────────────────────────────────────────┘

start on block-device-added

instance

script
    locks="$(sysblock --short --physdev "$DEVNAME")"
    # DEVNAME=/dev/mapper/vg-root → locks="sda sdb" (RAID-1)
    # DEVNAME=/dev/sda1           → locks="sda"

    locking $locks -- fsck -y "$DEVNAME"

    initctl variable append checked-filesystems "$DEVNAME"

    initctl emit filesystem-checked "$DEVNAME" -eDEVNAME
end script

start on filesystem-checked
start on filesystem-mounted

instance

script
    initctl variable list checked-filesystems | while read devname; do
        mountpoint="$(getmntent -fD "$devname")"

        if getmntent --prereqs-satisfied -d "$mountpoint"; then
            mount "$mountpoint"

            initctl variable remove checked-filesystems "$devname"

            initctl emit filesystem-mounted "$mountpoint" \\
                -eDEVNAME="$devname" -eMOUNTPOINT="$mountpoint"
        fi
    done
end script

sysblock /dev/sda1                             → /sys/block/sda/sda1
sysblock --dev /sys/block/sda/sda1             → /dev/sda1
sysblock --dev sda/sda1                        → /dev/sda1

sysblock --short /dev/sda1                     → sda/sda1
sysblock --short --dev /sys/block/sda/sda1     → sda1
sysblock --short --dev sda/sda1                → sda1

sysblock --short /dev/mapper/vg-root           → dm-0
sysblock --short --slaves /dev/mapper/vg-root  → md0
sysblock --short --slaves md0                  → sda/sda1 sdb/sdb1
sysblock --short --parent sda/sda1 sdb/sdb1    → sda sdb

sysblock --short --physdev /dev/mapper/vg-root → sda sdb

sysblock --dev --physdev /dev/mapper/vg-root   → /dev/sda /dev/sdb

start on block-device-added

instance

script
    locks="$(sysblock --short --physdev "$BLOCKDEV")"
    # BLOCKDEV=/dev/mapper/vg-root → locks="sda sdb" (RAID-1)
    # BLOCKDEV=/dev/sda1           → locks="sda"

    locking $locks -- fsck -y "$BLOCKDEV"

    echo "$BLOCKDEV" | lwrite --append /var/run/checked-filesystems

    initctl emit filesystem-checked -eBLOCKDEV
end script

start on filesystem-checked
start on filesystem-mounted

instance

script
    prereqs_satisfied() {
        local mountpoint="$1"
        getmntent -fD | while read dir; do
            case "$mountpoint" in
            "$dir"/*)
                # It is a prerequisite. Is it mounted?
                getmntent -mqd "$dir" || return 1
            esac
        done
        return 0
    }

    blockdevs=$(lread /var/run/checked-filesystems)

    for blockdev in $blockdevs; do
        mountpoint="$(getmntent -fD "$blockdev")"

        if prereqs_satisfied "$mountpoint"; then
            mount "$mountpoint"

            lfilter /var/run/checked-filesystems grep -Fxv "$blockdev"

            initctl emit filesystem-mounted -eBLOCKDEV="$blockdev" \\
                -eMOUNTPOINT="$mountpoint"
        fi
    done
end script

sysblock /dev/sda1                             → /sys/block/sda/sda1
sysblock --dev /sys/block/sda/sda1             → /dev/sda1
sysblock --dev sda/sda1                        → /dev/sda1

sysblock --short /dev/sda1                     → sda/sda1
sysblock --short --dev /sys/block/sda/sda1     → sda1
sysblock --short --dev sda/sda1                → sda1

sysblock --short /dev/mapper/vg-root           → dm-0
sysblock --short --slaves /dev/mapper/vg-root  → md0
sysblock --short --slaves md0                  → sda/sda1 sdb/sdb1
sysblock --short --parent sda/sda1 sdb/sdb1    → sda sdb

sysblock --short --physdev /dev/mapper/vg-root → sda sdb

sysblock --dev --physdev /dev/mapper/vg-root   → /dev/sda /dev/sdb

mplayer -af equalizer=-12:-12:-12:0:0:0:12:12:-6:-12 Lecture-xx.avi

Render_Plane_From(<0,1.8,-2.5>, <0,0,0>, <8,0,0>, <0,0,5>)

[lolssdsl0lqx]sx[1+lddd*lld*-ls+dsdrll2**lo+dsld*rd*+4<kd15>q]sq[q
]9ksk[d77/3*2-ss47lxx-P1+d78>0]s00[d23/.5-3*so0l0xr10P1+d24>u]dsux

[91PP[dx]93PP]dx

echo 'gtk-key-theme-name = "Emacs"' >>~/.gtkrc-2.0
gconftool -t string --set /desktop/gnome/interface/gtk_key_theme Emacs

string = 'Hello world'
print string.count('o'), len(string)  # prints 2, 11 – why not string.len()?

string = 'Hello world'
puts string.count('o'), string.length  # prints 2, 11

4.megabytes > 2345.kilobytes          # ⇒ true

3.weeks.ago                           # ⇒ Sun Nov 19 09:39:05 EET 2006

time_tomorrow = TimeTravel.travel(1.day.from_now) { Time.now }

# Iterate over the elements of an array.
[42, 'blah', Time.now].each do |element|
  puts element
end

# Iterate over the file line by line.
open('filename').each do |line|
  puts line
end

open 'filename', 'w' do |io|
  io.puts "Hello world!"
end

Tempfile.open_auto_rename 'filename' do |io|
  io.puts "Hello world!"
end

my_thread = Thread.new do
  puts  "This code is running in a thread."
  sleep 10
  puts  "Slept for a while."
end

# Now we can control the thread using the my_thread object.

context "Book" do
  setup do
    @book = Book.new :author => "Douglas Adams",
                     :title  => "The Hitchhiker's Guide to the Galaxy",
                     :year   => 1979
  end

  specify "should have the correct author" do
    @book.author.should == "Douglas Adams"
  end

  specify "should have the correct title" do
    @book.title.should == "The Hitchhiker's Guide to the Galaxy"
  end

  specify "should have the correct year" do
    @book.year.should == 1979
  end

  specify "should not have an ISBN" do
    @book.isbn.should == nil
  end

  specify "should be able to add the ISBN" do
    isbn = '0-330-25864-8' 

    @book.isbn        =  isbn
    @book.isbn.should == isbn
  end

  specify "should not be able to burn the book" do
    lambda { @book.burn! }.should_raise Book::DoesNotCatchFireError
  end
end

get "http://example.net/video_index.html"

# Find all links starting with "Video:"
page.links.text(/^Video:/).each do |link|
  begin
    transact do
      click link  # Example: http://example.net/videos/ruby_on_rails.html

      # From the resulting page, find the actual download link.
      video_link = page.links.text('Download this video').first
      filename   = File.basename video_link.href

      download video_link, filename
    end

  rescue => e
    log.error "Failed to download from #{link.href}: #{e.class}: #{e}"
  end
end

string = 'Hello world'
print string.count('o'), len(string)  # prints 2, 11 – why not string.len()?

string = 'Hello world'
puts string.count('o'), string.length  # prints 2, 11

4.megabytes > 2345.kilobytes          # ⇒ true

3.weeks.ago                           # ⇒ Sun Nov 19 09:39:05 EET 2006

time_tomorrow = TimeTravel.travel(1.day.from_now) { Time.now }

# Iterate over the elements of an array.
[42, 'blah', Time.now].each do |element|
  puts element
end

# Iterate over the file line by line.
open('filename').each do |line|
  puts line
end

open 'filename', 'w' do |io|
  io.puts "Hello world!"
end

Tempfile.open_auto_rename 'filename' do |io|
  io.puts "Hello world!"
end

my_thread = Thread.new do
  puts  "This code is running in a thread."
  sleep 10
  puts  "Slept for a while."
end

# Now we can control the thread using the my_thread object.

context "Book" do
  setup do
    @book = Book.new :author => "Douglas Adams",
                     :title  => "The Hitchhiker's Guide to the Galaxy",
                     :year   => 1979
  end

  specify "should have the correct author" do
    @book.author.should == "Douglas Adams"
  end

  specify "should have the correct title" do
    @book.title.should == "The Hitchhiker's Guide to the Galaxy"
  end

  specify "should have the correct year" do
    @book.year.should == 1979
  end

  specify "should not have an ISBN" do
    @book.isbn.should == nil
  end

  specify "should be able to add the ISBN" do
    isbn = '0-330-25864-8' 

    @book.isbn        =  isbn
    @book.isbn.should == isbn
  end

  specify "should not be able to burn the book" do
    lambda { @book.burn! }.should_raise Book::DoesNotCatchFireError
  end
end

get "http://example.net/video_index.html"

# Find all links starting with "Video:"
page.links.text(/^Video:/).each do |link|
  begin
    transact do
      click link  # Example: http://example.net/videos/ruby_on_rails.html

      # From the resulting page, find the actual download link.
      video_link = page.links.text('Download this video').first
      filename   = File.basename video_link.href

      download video_link, filename
    end

  rescue => e
    log.error "Failed to download from #{link.href}: #{e.class}: #{e}"
  end
end

Johan Kiviniemi’s series of tubes

World of Resources

Metaterrorism

extservice: A jQuery plugin

FFUU

Weight tracker

XMoto: private room guide

New “creating a weblog in 15 minutes with Rails” video

My Ubuntu installation checklist

Viewing order of the Babylon 5 episodes

Season 1

Season 2

Season 3

Season 4

Season 5

Crusade

The rest

Fixing the font rendering in Ubuntu

/etc/fonts/conf.d/99-sharp-fonts.conf

/etc/X11/Xresources/sharp-fonts

Explanation of my issue with the default font rendering

The speed difference between svn diff and git diff

Shameful confession

The order of Heroes episodes and graphic novels

Upstart and interaction with user

General design

Frontends

what-terminal

what-gtk and what-qt

usplash and other boot splash programs

Considerations

Upstart and mounting partitions, part 2

/etc/event.d/fsck

/etc/event.d/mount

The commands

Upstart and mounting partitions

/etc/event.d/fsck

/etc/event.d/mount

The commands used in the examples

Making X report the mouse position with subpixel precision

Implementation

Structure and Interpretation of Computer Programs

Program of the fortnight: atool

A room illusion with POV-Ray

The original scene

The test scene

”Tiedät varmaan, miksi soitan”

Fun with dc

Emacs key bindings in Gtk apps

Ananasmurska – Excellence™

Ruby vs. Python (suomeksi)

Yksityiset metodit ja muuttujat

Funktiot ja metodit

”self”

Instanssimuuttujien merkintä

Rubyssä ”everything is an object”

Koodiblokit

Ensimmäinen tosielämän esimerkki: each

Muita esimerkkejä

Tiedostot

Säikeet

Yksikkötestaus

Mechanize

Loppusanat

Ruby vs. Python

Private methods and variables

Functions and methods

“self”

Notation of instance variables

In Ruby, everything is an object

Blocks

The first real-world example: each

Other examples

Files

Threads

Unit testing

Mechanize

Conclusion

Syyt olla k{ytt{m{tt{ 8-bittisi{ merkist|j{

"Latin-1 -tuki on saatavilla useimpiin IRC-clientteihin" -v{ite

`what-terminal`

`what-gtk` and `what-qt`

`usplash` and other boot splash programs

”`self`”

Ensimmäinen tosielämän esimerkki: `each`

“`self`”

The first real-world example: `each`