Test rewrite rules to web-lower-case

[hinerm]

To preserve links through the mass rename in #98, ideally we could rewrite all urls to web-lower-case as suggested by @ctrueden:

# https://stackoverflow.com/a/2924084/1207769
RewriteMap lc int:tolower
RewriteRule ^/(media/.*)$ /${lc:$1} [R=301]
# https://stackoverflow.com/a/1279758/1207769
RewriteRule ^(/media/.*/[^/]*?)_([^/]*?_[^/]*)$ $1-$2 [N]
RewriteRule ^(/media/.*/[^/]*?)_([^/_]*)$ $1-$2 [R=301]

This needs to be tested, and if it doesn't work then we need auto-generated redirects for each rename.

[ctrueden]

@hinerm What do you think? Is it important for all the old media links to redirect to their new locations?

For example: https://imagej.net/images/0/0c/TrackMate-Logo85x50-color-300p.png ➡️ https://imagej.net/media/logos/trackmate-300p.png

If so, I don't think we have an alternative other than manual redirect rules for tons of media files, because many of them changed to different subdirectories. We could either:

1. Extract the renames out of the Git history; or
2. Generate all md5sums for everything imagej-wiki-static/docs/images and everything in imagej.github.io/media and match them up.

If we want to keep these links working, then I'd favor approach (2) above—it would be easy to do—but it would add thousands more redirect rules to our Apache configuration. So my (weak) preference would be not to bother. All the actual page links are mapped appropriately; I don't see a compelling reason to keep old direct links to images working. There might be a few e.g. on forum.image.sc that we need to update, but it's doable, no?

If you agree, then please close this. Or if you would prefer to put image redirects in place, then go ahead and try the md5sum approach to generate the rules?

[hinerm]

I don't see a compelling reason to keep old direct links to images working.

Totally agree

[ctrueden]

So, I did end up doing md5s of all the old media files, and all the new media files, and creating a mapping between them. In case we need it again in the future, I placed it here:

https://downloads.imagej.net/~curtis/imagej-wiki-media/

I did it so that I could easily fix various places with hardcoded direct media links from the old wiki:

imagej/presentations@a505404
imagej/presentations@80fbd54
fiji/Samples@9fdfc0a
fiji/Trainable_Segmentation@ef8f87f
imagej/tutorials@4afd7bb
fiji/fiji.github.io@c2f3669
mpicbg-scicomp/Interactive-H-Watershed#20

Here's the shell script I used to apply the fixes from the mapping.txt file:

$ git grep -oh 'imagej.net/_images/[^\\)<"]*' | sort -u | while read line
do
p=${line#imagej.net/}
nl=$(grep "$p :: " /path/to/mapping.txt)
test "$nl" && {
  np=${nl#* :: }
  echo "sed -i '' -e 's;$p;$np;g' /path/to/affected-files"
} || echo "[ERROR] NO NEW IMAGE FOR $line"
done | sh

If you use this, I suggest running without the | sh first to verify that the sed commands look good.