Thursday, October 17, 2019

Wednesday, October 16, 2019

flexbox reference

Huh. A Complete Guide to Flexbox has lost some of its googlejuice, apparently, with w3school's boring, less visual, and less helpful guide claiming the top spot. So I'm putting the link here for my future reference...

Tuesday, October 15, 2019

filed away

Simon Pitt writing on "Computer Files Are Going Extinct" (or "The Death of the Computer File.doc") had this nice line:
Years ago websites were made of files; now they are made of dependencies.
I would nitpick and say "files plus browsers and maybe a scripting language", but I think Pitt points to  a major sea change. For me, coding is still about files - nouns - and then very well tested trustworthy verbs of the browser itself, and not too many intermediaries. Now coding is so much verb, so much process, and younger programmers put raw DOM into the same "low level stuff I don't need to think about much" level as an older CGI hacker might put assembly language.

The rest of the article was kind of delightful for us old-timers, reviewing how services and streams and what not have replaced quasi-physical files.

And I think that's a bummer. I'm currently reading Barbara Tversky's "Mind in Motion: How Action Shapes Thought". It really emphasizes how there's a physicality to our thoughts, that we turn to metaphors of space and motion all the time to make sense of our experiential data - and with files and folders, there was a physical nature to our filesystems as well. I kind of hate the iPhone's "all your photos as a big stream" approach to life, or using "smart folders" to take a giant heap of information. Folders can be clutzy and coarse grained, but there was a flexibility and sense of stability to them that the modern replacements lack.

this code changed everything

Nice piece from Slate, The 36 Bits of Software That Changed Our Lives (Of course, a casual geek might wonder if that should be 32-Bit, but 18- and 36-bit machines were a thing back in the day...)

Saturday, October 12, 2019

exif continues to be a hot mess

Years ago I found an ImageMagick fix to rotating images shot on iPhones: something as elegant as
mogrify -auto-orient imagename.jpg
did the trick.

iOS recently added an option for web uploads form to use a smaller image size - which can save a lot of bandwidth, since often you don't need an image in its full multi-megapixel splendor. But apparently if you do that (as I tried with the first image I posted on my commonplace blog) the "-auto-orient" I was relying on gets confused. (I repeated the process with the full image it was fine.)

I haven't really researched this yet, but I suspect the Exif information - explaining how the image was shot rotated - is preserved for the smaller image, but the image data already has the appropriate rotation applied.

I know I'm not the only one wrestling with this kind of thing - here's an article on The dumb reason your fancy Computer Vision app isn’t working: Exif Orientation. As it says:
Exif metadata is not a native part of the Jpeg file format. It was an afterthought taken from the TIFF file format and tacked onto the Jpeg file format much later. This maintained backwards compatibility with old image viewers, but it meant that some programs never bothered to parse Exif data.
But worse than that, right now I'm not convinced there's a flag that says "this rotation data is for historical purposes only" vs "this rotation data is needed for proper display of the image" - or if there is, iOS and (my admittedly old install of) ImageMagick don't agree what that is.

Wednesday, October 9, 2019

context is strawberries

Every once in a while I get a notice from my old computer science department telling me I need to reset my password. To be honest, ssh'ing to reset the password is about the only thing I do with the account, and if I was less nostalgic I would just let it go. (Til then: enjoy visiting https://www.eecs.tufts.edu/~kisrael/ and see the web like it used to be, in the mid '90s...)

One of the funniest quirks from my old account is that once upon a time I replaced the regular "more" comand with an alias to this little script:

#!/local/bin/perl   

$target = $ARGV[0];

if(-d $target) {
exec "ls -F $target";
} else {
exec "less $target";
}

That's... kind of charming? Probably I kept typing "more directoryname" when I meant to "ls directoryname" ... so I made "more" into a generalized "view the contents of this", which makes a certain kind of sense but is a little weird...

Monday, October 7, 2019

converting HEIC to JPG on Mac easily

iOS tends to internally store photos as "HEIC". a more modern, space-efficient format. Usually you don't notice, and most ways of transferring files off of the device automagically converts the image into more standard things like JPG, but AirDrop tends to keep it as HEIC. This page outlines how to use the Automator to set up a "Quick Action" to make a copy of the file and convert it - then there will be a context menu option for your files to do the conversion.

I tend to do all temporary file work - from screenshots to where Airdrop puts things - in "Downloads" rather than the Desktop. (I don't know about you but my Desktop usually is covered with windows...) And I then actually go one more step and make it so Automator then drops the " copy" from the filename- I had to wrestle with Automator a bit but this setup finally got me the results I wanted: