joakim.erdfelt.com

So here I am, working on an expression bug in Apache Archiva, when I notice that one of my twitter tracks on "maven" got a hit.

Since I work with maven regularly, and thoroughly enjoy it. I decided to see how persistent therealadam is about disliking maven.

Hmm, not a pleasant experience his group is having...

Well ... it's not the first time I've read or heard negative thoughts about maven.

So I left it alone and went to get a fresh glass of water. When I reached the kitchen, it hit me. Maven is like Chickenpox. Yes, you heard me right, Chickenpox. Lemme see if I can explain.

• It starts out with bodily sores.
• It is highly contagious.
• Tends to cause itching in early stages.
• Medication doesn't help.
• Symptoms rarely reappear.
• Young developers catch it and don't think twice about it.
• Catching it when you are older can be dangerous.
• You can suffer greatly if you catch it when you are old.
• Older developers that have caught it when they were young, make sure that their young ones catch it when they are young.
• Once caught, you have chicken pox for life.

Being an developer on one or more popular open source project can really make your email experience quite unique. Having, or even discussing, add-ons for Thunderbird is even more unique.

I've collected a few Thunderbird extensions that I consider essential, and have made my email experience more streamlined. I want to share them with my fellow open source developers that have yet to be seduced to the dark side email client known as mail.app

Here's what my email message view looks like right now

Display Mailing List Header

by Christian Weiske

Pretty simple add-on that adds a new condensed row, with hyperlinks to the common mailing list functions advertised within the email header.

Colored Diffs

by Vadim Atlygin

Take the boring and often hard to read commit messages and diffs that arrive in email and colorize them.

Showing the colorized email, new in-message toolbar, and even the long subject line scroll bar.

Just thought I'd let you know what the Maven Universe looks like in graph form.

All 221 modules. (no sandbox or test modules included)

All 221 Maven Modules

All 221 Maven Modules / Transitive Reduced

This is just an update some exciting work I've been doing for the maven project.

Graphs about your Maven projects.

See dev@maven.apache.org mailing list topic: [m2] Adding further dependency goals

I'm working on adding several graphs.

a) Single Project Dependencies - True / Complete / Simple View
b) Single Project Dependencies - True / Grouped / Clustered by GroupID
c) Single Project Dependencies - True / Transitive Reduced
d) Single Project Dependencies - Resolved
e) Multi Module - True / Only Modules / Simple View
f) Multi Module - True / Only Modules / Transitive Reduced
g) Multi Module - True / Complete / With Dependencies
i) Multi Module - True / Complete / With Dependencies / Transitive Reduced
j) Multi Module - True / Complete / With Dependencies / Grouped / Clustered by GroupID
k) Multi Module - Resolved / With Dependencies 

Maven 2.1 Trunk - Only Modules / Simple View

Maven 2.1 Trunk - Only Modules / Transitive Reduced

Continuum Trunk - Only Modules / Simple View

Continuum Trunk - Only Modules / Transitive Reduced

Archiva Trunk - Only Modules / Simple View

Archiva Trunk - Only Modules / Transitive Reduced

These graphs have been created by a maven plugin that is in the works, it utilizes the plexus-graphing libraries (subversion repository can be found at https://svn.codehaus.org/plexus/plexus-sandbox/trunk/plexus-components/plexus-graphing/ ) to produce the above images. The plexus-graphing library has support for multiple providers (such as graphviz and prefuse).

I'll update this blog as this plugin begins to take on more features.

Want to watermark your images in an automated fashion using command line tools?

The Technique

Prerequirements:

• Unix: Use of a POSIX compatible Unix is required. Linux, OSX, FreeBSD, etc... are all good. If you are windows user, go install a copy of Cygwin, it's a POSIX compatibility layer on top of windows.
• Bash Shell: If you have Unix, you most likely have Bash already.
• ImageMagick: Install a copy of the ImageMagick tools, using your favorite installer (yum, apt, rpm, deb, tarball, source, etc...)

Start with by creating a PNG image with alpha channel that represents the overlay that you want.

watermark.png (219x42)

Use the composite tool from ImageMagick to apply the watermark.png image onto the original image to produce the desired effect.

  $ composite -gravity SouthEast watermark.png original-image.png output-image.png

How to take a directory full of PNG files and add a copymark to each.

for PNG in *.png
do 
  echo Adding watermark to $PNG
  composite -gravity SouthEast watermark.png $PNG ${PNG//.png}-watermarked.png
done

How would you like an Icon in Windows that will pop up an explorer window that shows only the maven repository and nothing else?

An icon that shows you this ...

Simple. Create a new shortcut on your desktop with the following for the "Location of the item."

%windir%\explorer.exe /n,/e,/root,%userprofile%\.m2\repository\

All done.

Lets say you have a set of images that you want to add to your website, but you want to make sure that each one has copyright visible and attached to the image. But you want it to be consistent, and not have to pull each one into Gimp or Photoshop in order to add that copyright text. Here's what you do.

The Script

These instructions require a knowledge of Bash and Unix.

A bash shell script has been prepared to help you with the addition of copyright text to your image.

Prerequirements:

• Unix: Use of a POSIX compatible Unix is required. Linux, OSX, FreeBSD, etc... are all good. If you are windows user, go install a copy of Cygwin, it's a POSIX compatibility layer on top of windows.
• Bash Shell: If you have Unix, you most likely have Bash already.
• Netpbm: Install a copy of the netpbm tools, using your favorite installer (yum, apt, rpm, deb, tarball, source, etc...)

This pnmcopymark.sh bash shell script.

#!/bin/bash

TEMPDIR=".pnmcopymark"

if [ ! -d "$TEMPDIR" ] ; then
    mkdir -p $TEMPDIR
fi

function pnmWidth() {
    PNM=$1
    
    pamfile $PNM | \
        sed -e "s/^.* \([0-9][0-9]*\) by [0-9][0-9]* .*$/\1/g"
}

function pnmHeight() {
    PNM=$1
    
    pamfile $PNM | \
        sed -e "s/^.* [0-9][0-9]* by \([0-9][0-9]*\) .*$/\1/g"
}

function pnmAddCopyMark() {
    PNM=$1
    
    BGCOLOR="#ffffff"
    CMPNM="copymark-text.pnm"
    
    let pnmWidth=`pnmWidth "$PNM"`
    let cmWidth=`pnmWidth "$CMPNM"`
    let cmHeight=`pnmHeight "$CMPNM"`

    ppmmake "$BGCOLOR" $pnmWidth $cmHeight > $TEMPDIR/wide_blank.pnm

    if [ $pnmWidth -lt $cmWidth ] ; then
        pnmscale -width $pnmWidth "$CMPNM" > $TEMPDIR/scaled_text.pnm
        cp $TEMPDIR/scaled_text.pnm $TEMPDIR/text.pnm
    else
        cp "$CMPNM" $TEMPDIR/text.pnm
    fi
    
    pnmpaste -replace $TEMPDIR/text.pnm 0 0 $TEMPDIR/wide_blank.pnm > \
        $TEMPDIR/wide_text.pnm
    pnmcat -topbottom "$PNM" $TEMPDIR/wide_text.pnm > \
        $TEMPDIR/result.pnm
    
    cp $TEMPDIR/result.pnm $PNM
}

PNMT="$TEMPDIR/temp.pnm"

if [ -z "$1" ]; then
    pnmtopnm > $PNMT
else
    cp $1 $PNMT
fi

pnmAddCopyMark "$PNMT"
pnmtopnm "$PNMT"

rm -rf $TEMPDIR

Executing the Script

Create your copyright text image. In your image editor (Gimp, Photoshop, etc...) create a small sliver of an image that has your copyright text in it. (Only need to do this once!)

copymark-text.png (348x17)

Convert your copymark-text.png image to a PNM file so that netpbm and the script can use it. (Only need to do this once!)

To execute the pnmcopymark.sh script you have to do it the netpbm way, which is to first convert the original image into the PNM format (netpbm internal image format) so it can be piped thru the other tools and scripts before eventually being converted back into the output format you desire.

$  pngtoppm copymark-text.png > copymark-text.pnm

How to take a PNG file and add a copymark to it.

  $ pngtopnm flower-red-bold.png | ./pnmcopymark.sh | \
     pnmtopng -compression=9 > flower-red-bold-with-copymark.png

How to take a directory full of PNG files and add a copymark to each.

for PNG in *.png
do 
  echo Adding copymark to $PNG
  pngtopnm $PNG | ./pnmcopymark.sh | \
    pnmtopng -compression=9 > ${PNG//.png}-with-copymark.png
done

Lets say you have a set of images that you want to add to your website, but you want to make sure that each one has a drop shadow. But you want it to be consistent, and not have to pull each one into Gimp or Photoshop in order to add that drop shadow. Here's what you do.

The Script

These instructions require a knowledge of Bash and Unix.

A bash shell script has been prepared to help you with the creation of the drop shadow.

Prerequirements:

• Unix: Use of a POSIX compatible Unix is required. Linux, OSX, FreeBSD, etc... are all good. If you are windows user, go install a copy of Cygwin, it's a POSIX compatibility layer on top of windows.
• Bash Shell: If you have Unix, you most likely have Bash already.
• Netpbm: Install a copy of the netpbm tools, using your favorite installer (yum, apt, rpm, deb, tarball, source, etc...)

This pnmdropshadow.sh bash shell script.

#!/bin/bash

TEMPDIR=".pnmdropshadow"

if [ ! -d "$TEMPDIR" ] ; then
    mkdir -p $TEMPDIR
fi

function pnmWidth() {
    PNM=$1
    
    pamfile $PNM | \
        sed -e "s/^.* \([0-9][0-9]*\) by [0-9][0-9]* .*$/\1/g"
}

function pnmHeight() {
    PNM=$1
    
    pamfile $PNM | \
        sed -e "s/^.* [0-9][0-9]* by \([0-9][0-9]*\) .*$/\1/g"
}

function pnmBorder() {
    PNM=$1

    COLOR="#555555"

    # Add Border to PNM
    pnmmargin -color "$COLOR" 1 $PNM > $TEMPDIR/with_border.pnm

    cp $TEMPDIR/with_border.pnm $PNM
}

function createConvolMap() {
    let blurSize=$1;

    if [ `expr $blurSize % 2` -eq 0 ] ; then
        let blurSize=$blurSize+1;
    fi

    let offset=$blurSize*$blurSize;
    let rowvalue=$offset+1;
    let offset=$offset*2;

    echo "P2"
    echo "$blurSize $blurSize"
    echo "$offset"

    for (( y=0; y<$blurSize; y++))
    do
        for (( x=0; x<$blurSize; x++))
        do
            echo -n "$rowvalue"
            if [ $x -ne $blurSize ]
            then
                echo -n " "
            fi
        done
        echo ""
    done
}

function pnmDropShadow() {
    PNM=$1
    
    BGCOLOR="#ffffff"
    SHADOWCOLOR="#888888"
    
    let shadowOffset=4;
    let shadowBlur=5;

    let leftPad=$shadowBlur-$shadowOffset;
    if [ $leftPad -lt 0 ] ; then
        let leftPad=0;
    fi
    let rightPad=$shadowBlur+$shadowOffset;
    if [ $rightPad -lt 0 ] ; then
        let rightPad=0;
    fi
    let topPad=$shadowBlur-$shadowOffset;
    if [ $topPad -lt 0 ] ; then
        let topPad=0;
    fi
    let bottomPad=$shadowBlur+$shadowOffset;
    if [ $bottomPad -lt 0 ] ; then
        let bottomPad=0;
    fi

    let pnmWidth=`pnmWidth "$PNM"`
    let pnmHeight=`pnmHeight "$PNM"`
    let shadowWidth=$pnmWidth+$leftPad+$rightPad;
    let shadowHeight=$pnmHeight+$topPad+$bottomPad;

    # Create the shadow background
    ppmmake "$BGCOLOR" $shadowWidth $shadowHeight > \
        $TEMPDIR/shadow_background.pnm
    
    # Create the mask block
    ppmmake "$SHADOWCOLOR" $pnmWidth $pnmHeight > \
        $TEMPDIR/shadow_mask.pnm
    
    # Insert mask block into the background block
    pnmpaste -replace \
        $TEMPDIR/shadow_mask.pnm \
        $shadowOffset $shadowOffset \
        $TEMPDIR/shadow_background.pnm > \
            $TEMPDIR/shadow_paste.pnm

    # Create Convolution Matrix File
    createConvolMap "$shadowBlur" > $TEMPDIR/shadow.cnv

    # Blur the shadow
    pnmconvol \
        $TEMPDIR/shadow.cnv \
        $TEMPDIR/shadow_paste.pnm > \
            $TEMPDIR/shadow_blur.pnm

    # Put original image into blur
    pnmpaste -replace $PNM \
        $leftPad $topPad $TEMPDIR/shadow_blur.pnm > \
            $TEMPDIR/with_shadow.pnm

    cp $TEMPDIR/with_shadow.pnm $PNM
}

PNMT="$TEMPDIR/temp.pnm"

if [ -z "$1" ]; then
    pnmtopnm > $PNMT
else
    cp $1 $PNMT
fi

pnmBorder "$PNMT"
pnmDropShadow "$PNMT"

pnmtopnm "$PNMT"

rm -rf $TEMPDIR

Executing the Script

To execute the pnmdropshadow.sh script you have to do it the netpbm way, which is to first convert the original image into the PNM format (netpbm internal image format) so it can be piped thru the other tools and scripts before eventually being converted back into the output format you desire.

How to take a PNG file and add a dropshadow to it.

  $ pngtopnm flower-pink.png | ./pnmdropshadow.sh | \
     pnmtopng -compression=9 > flower-pink-with-shadow.png

How to take a directory full of PNG files and add a dropshadow to each.

for PNG in *.png
do 
  echo Adding drop shadow to $PNG
  pngtopnm $PNG | ./pnmdropshadow.sh | \
    pnmtopng -compression=9 > ${PNG//.png}-with-shadow.png
done

Found a few geek license plates out in California (shock!).

Enjoy ...