book: work around lagging translations' image paths

At some stage in 2017, the progit2 layout was changed so that all images
live in a central location. The `saveImage` method was written with that
layout in mind.

However, there is at least one translation that has not switched to the
new layout yet, and its images are in a location relative to the
respective chapters' source files that reference them.

Let's make sure that we handle those layouts correctly, too, then.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

script/update-book2.rb

@@ -182,7 +182,18 @@ def genbook(language_code, &get_content)
         content = get_content.call(path)
         csection.saveImage(path, content)
       rescue Errno::ENOENT
-        puts "::error::referenced image #{path} does not exit!"
+        begin
+          # Try again with a path relative to the chapter's source file. This
+          # used to be common before progit2's d2152ec3 (New architecture of the
+          # repository for manual building of the book., 2017-08-28), and not all
+          # translations (ahem, `progit2-uz`) managed to merge that commit yet.
+          chapter_filename = chapters["ch#{index}"][2]
+          path2 = chapter_filename.sub(/[^\/]*$/, path)
+          content = get_content.call(path2)
+          csection.saveImage(path, content)
+        rescue Errno::ENOENT
+          puts "::error::referenced image #{path} does not exit!"
+        end
       end
 
       book.xrefs[id_xref] = csection