I just ran across a painful "gotcha." I have a tiddlywiki with some external images, created by running a command like this -- https://tiddlywiki.com/static/ExternalImages.html
I added a few more images by dragging and dropping, and then decided I wanted to externalize them again. So I ran the script again. Copied the contents of output/images to my existing images/ directory, and thought I was good. Unfortunately all of my existing externalized images just got destroyed -- replaced by zero-length files. When you run that image-externalizer command, it tries to make external copies *even of the images that are already external*. Those tiddlers have no content, so files are created with the name of the image, and filled with that "nothing". When I copied them back out of the output directory to the image directory, the empty files overwrote the regular ones. Luckily I had backups! But yikes. Externalizing already-externalized images is bad news! This seems to do the job right: tiddlywiki --load $tiddlyfile --savetiddlers '[is[image]!has[_canonical_uri]]' images --setfield '[is[image]!has[_canonical_uri]]' _canonical_uri $:/core/templates/canonical -uri-external-image text/plain --setfield '[is[image]!has[_canonical_uri]]' text "" text/plain --rendertiddler $:/core/save/all $tiddlyfile text/plain -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/85ad8ddb-f1b2-447f-b7cd-0a59be618b6e%40googlegroups.com.
