Brad Lucas

Programming, Clojure and other interests

Coin Market Cap

July 1, 2017

There is a useful page called CryptoCurrency Market Capitalizations for viewing the current state of the crytocurency markets.

The site shows all currencies runing today on a number of platforms. I'm interested in the ones running on Ethereum which have a Market Cap. Since, the site doesn't have this specific filtering capability I thought it would make a good project to grab the data from the page and filter it the way I'd like.

To do this I decided to investigate Pandas and it's read_html function for pulling data in from html tables.

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June 30, 2017

For testing it is sometimes of interest to have a web service which returns OK for anything that is passed to it much like the null device in Unix. In Unix you can open open the /dev/null device and write to it. It is an empty file that accepts all data written to it without storing the data.

For a web service to act in a similar fashion it would run and accept anything passed as a parameter in urls passed to it.


How could such an application be built in Clojure? One way would be to use HTTP Kit and have it return OK for anything that is passed to it.

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Bump Version

June 29, 2017

A script to bump the version number in a pom.xml file.


# A script to bump the version number inside a pom.xml file

if [ -z "$1" ]
    echo ""
    echo "Bump version script for incrementing the version number in a project's pom.xml file."
    echo ""
    echo "Usage: bump-version 'version-string'"
    echo ""
    echo ""

echo $VER

# enure we have a value 
CMD="mvn versions:set -DnewVersion=$VER"
echo "Executing:"
echo $CMD

mvn versions:set -DnewVersion=$VER

echo "done"

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Diff Heroku Configs

June 28, 2017

Here is a script that was created to diff the configurations between two Heroku apps. This came about when configuring and testing a development and a production Heroku system. In this case you want to know how they differ.



CMD="diff <(heroku config --app $APP1) <(heroku config --app $APP2)"
echo $CMD

eval $CMD
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Car Rental Fees And Taxes

June 27, 2017

It looks like fees and taxes for car rentals is out of control. Anyone notice? Here is an example.

I wanted to rent a car for two weeks so I shopped around. It looks like for a car it would be about $360 dollars a week that totalled specifically to $729.30 for two weeks.

Click the button to finalize and the total is $1046. What? There is $317 dollars in taxes and fees. Nearly the price of a week's rental.

| Compact Suv                       |       |  729.30 |
| Unlimited Mileage                 |       |         |
|                                   |       |         |
| TAXES & FEE                       |       |         |
| Consolidated Facility Chg 6.00/Dy | 84.00 |         |
| Concession Recovery Fee 11.11 Pct | 81.77 |         |
| Wa State Rental Tax 5.9 Pct       | 48.25 |         |
| Rta Tax 0.80 Pct                  |  6.54 |         |
| Sports Facility Tax 1.00 Pct      |  8.18 |         |
| Veh License Cost Recovery .48/Day |  6.72 |         |
| Sales Tax (10.0%)                 | 81.78 |         |
|                                   |       |  317.24 |
|                                   |       |         |
| TOTAL                             |       | 1046.54 |

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