As a quick note, I use code like this read a text file into an Array, List, or Seq using Scala:
def readFile(filename: String): Seq[String] = {
val bufferedSource = io.Source.fromFile(filename)
val lines = (for (line <- bufferedSource.getLines()) yield line).toList
bufferedSource.close
lines
}
As a short “note to self,” I just used this Scala code to (a) create a list that contains random strings of different lengths, then (b) shuffle the list of strings to create a more random effect:
This is a Bash shell script written for Ubuntu (Linux). I just switched from Mac/MacOS to Ubuntu, and I don't like the default blank screensaver in Ubuntu. I just want a screensaver to rotate my collection of images, so I'm considering using this rather than Xscreensaver. The script comes from jamcnaughton.com.
As a quick note today, to shuffle/randomize a list in Scala, use this technique:
scala.util.Random.shuffle(List(1,2,3,4))
Here’s what this approach looks like in the Scala REPL:
As a quick note, I haven’t tried to log into one of my GoDaddy websites in several months, and when I tried to log in just now I got this macOS ssh error message:
Unable to negotiate with <ip-address here> port 22: no matching host key type found. Their offer: ssh-dss
I have a shared web hosting account on GoDaddy, and wanted to do a 301 redirect with an Apache .htaccess file. For some unknown reason GoDaddy’s web interface wasn’t working for this, so I thought I’d fix the problem manually.
In short, this did NOT work:
Redirect 301 /the-old-uri http://alvinalexander.com/the-new-uri
Here’s some source code for a little Scala email client. It’s nothing much, just a little wrapper that works with the JavaMail API:
I generally try to avoid this coding style these days, but, if you want to see how to use a Java BufferedReader and its readLine method in a Scala while loop, here you go:
I was looking for a good way to access XML resources (like RSS feeds) in Scala, and I currently like the idea of using ScalaJ-HTTP to access the URL and download the XML content, and then using the Scala XML library to process the XML string I download from the URL.
This example Scala program shows my current approach:
Note: The code shown below is a bit old. If you want to perform a “search and replace” operation on all instances of a given pattern, all you have to do these days is use the replaceAll method on a Java String, like this:
String s = "123 Main Street";
String result = s.replaceAll("[0-9]", "-");
That second line of code returns the string “--- Main Street”. I kept the information below here for background information.
Using Akka logging is a great thing, until you need to turn it off. In short, to disable Akka logging, you need to create a file named application.conf in your SBT src/main/resources folder, and set the loglevel to “OFF” in that file, like this:
As a quick note, if you ever want to created a dotted border that has some RGB opacity to it, I just used the following CSS code to style some hyperlinks, and I can confirm that it works:
Here’s a short Java/JDBC example program where I show how to perform SQL SELECT, INSERT, UPDATE, and DELETE statements with JDBC:
As a quick note and a little bit of source code sharing, I wrote the following Perl script to delete all of the binary files it finds in a list of files it’s given. I named this script deleteBinaryFiles.pl, and it should be called like this:
deleteBinaryFiles.pl listOfFilesToLookAt
where listOfFilesToLookAt is a file that contains a list of filenames, with one filename per line.
Given that brief introduction, here’s the source code:
If you’ve never used AppleScript, here are two iTunes AppleScript examples to get you going. First, This one tells iTunes to play the playlist named “My Favorites”:
tell application "iTunes"
play playlist "My Favorites"
end tell
That script starts playing a random song from that playlist. If you want to start by playing the first song of that playlist, this script will do the trick:
As a quick note, if you’re looking at a Drupal form and it says you can use the "Rewrite the output of this field" replacement patterns shown (somewhere) on this page — and you can’t find those replacement patterns on that page — you can find a complete list of them at this drupal.org url.
As an example, if you’re working with a Drupal Node, you can use replacement patterns like these:
[node:author:name] [node:content-type] [node:content-type:name]
As a quick CSS note, if you want to achieve a “zebra striping” style with even and odd CSS row selectors, CSS styles like this will get the job done:
.path-frontpage .content-inner-right .content-type-Text:nth-child(even) {
/* yellow */
background-color: #fdfdf6;
}
.path-frontpage .content-inner-right .content-type-Text:nth-child(odd) {
/* blue */
background-color: #f3fbff;
}
I use that CSS for the front page of this website, but if you want a simpler example, here you go:
SQL FAQ: How can I select every row from a database table where a column value is not unique?
I’m working on an problem today where a Drupal article can have many revisions, and the way Drupal works is that a table named node_revisions has a nid field for “node id,” and a vid field for “revision id.” If you have five revisions of an article (i.e., a blog post), there will be five records in this table, and each record will have the same nid value and a unique vid. If an article has no revisions, this table will have one entry with a unique nid and unique vid.
If you have a Drupal 8 website and your images are not showing up on your image/photo nodes, one possible problem (which I just learned) is that your Drupal 8 theme needs to refer to {{ content }} in node.html.twig and not {{ content.body }}.
I don't know why you have to do that, but after four hours of troubleshooting the problem with my own Drupal 8 website/theme, I can confirm that if you don't do it, your images/photos won't be shown on their nodes. (All I was trying to do was to separate content.body from content.comment, and when I did that my images no longer showed up at their nodes/URLs.)