In the playlist view of schemep3, I display the last play date of each song in the format YYYY-MM-DD. I discovered that PLT supplies a function called date->string whose format is determined by the value of the parameter date-display-format. Fortunately, one of the values of date-display-format is ‘iso-8601 which will display in YYYY-MM-DD [...]
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One of the things that took me a long time to figure out, was how to do platform specific code from a C extension. It’s pretty easy to determine which platform you are on (system-type), but require must be a top-level form, so it can be in a conditional. I discovered that what I really [...] Due to frightful weather and an excess of accumulated days off, I spent the morning rocking out some AppleScript. I’m a big fan of Jing. I’m also a fan of IRC. On the IRC channel/server I connect to, we send a lot of Jing recordings back and forth. On my PC I use Pidgin to [...] Yesterday I discovered match-lambda and match-lambda*. They allow you to do lambda functions with pattern matching. It helped clean up my playlist callbacks in Schemep3. Instead of this: (playlist-add-hook After I posted a question on the PLT Scheme mailing list asking how to clean up a database resource from an iterator, someone pointed me towards will-executor. Basically, it allows you to install a “will” that can get executed when a value has been determined to be no longer reachable. This allows you [...] I found a bug in Schemep3 related to some issues in the paths Windows gives you for drag and drop. I was getting duplicate entries for some files. I had seen this problem before, but that time, the problem was that some paths had “/” in them where in other cases they had “” so the [...] For Schemep3 it was very important that I have a parser for mp3 and FLAC files. At first, I rolled my own scheme only implementation for both, but found it very cumbersome and I did not have much faith in them. Then I tried id3lib which did not work as well as I [...] Last post, I posted my in-path iterator that iterates through all the files in a particular path. Today’s function will recursively iterate through all the files in a path and its subdirectories. This is more useful for my Schemep3 program tha in-path because generally I want to recurse through all the files when [...] As I mentioned last time, I’ve also used the cool iterators in PLT Scheme to create iterators for directory contents. Without further ado: (require srfi/26) (define (directory-or-file-list path) (define (in-path path) I recently came to understand the great power behind the iteration and comprehension forms in PLT Scheme. Once I realized how they worked, I wrote the following iterator that will iterate over an association list and decouple the key and value in the process. (define (in-alist alist) |
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