[generic] add functools to eval scope

[Jaid]

I have a pretty complex eval expression to clean the title metadata variable. It applies a list of RegEx subtitutions to the string. Currently, I have to use nested function calls for this, like re.sub(re.sub(re.sub(re.sub(re.sub(re.sub()))))) which is hard to read and maintain. I would prefer executing this from left to right using functools.reduce, making my filename expression in config.json look like this:

(as json)

{
  "extractor": {
    "filename": {
      "'num' in locals() and bool(num) and 'title' in locals() and bool(title)": "\fE str(num).zfill(2) + ' – ' + functools.reduce(lambda text, subArguments: re.sub(subArguments[0], subArguments[1], text), [[\"'\", '’'], ['\\.{3}', '…'], ['\\s+', ' '], ['\"(.*?)\"', '“\\g<1>”'], ['[^-\\w,–()[\\]#&:;’„”“… ]+', '_'], ['(^[_\\s]+|[_\\s]+$)', ''], ['^((.{80}).).*$', '\\g<2>…']], title) + '.' + extension",
      "'num' in locals() and bool(num)": "\fE str(num).zfill(2) + '.' + extension",
      "'title' in locals() and bool(title)": "\fE functools.reduce(lambda text, subArguments: re.sub(subArguments[0], subArguments[1], text), [[\"'\", '’'], ['\\.{3}', '…'], ['\\s+', ' '], ['\"(.*?)\"', '“\\g<1>”'], ['[^-\\w,–()[\\]#&:;’„”“… ]+', '_'], ['(^[_\\s]+|[_\\s]+$)', ''], ['^((.{80}).).*$', '\\g<2>…']], title) + '.' + extension",
      "": "{id}.{extension}"
    }
  }
}

(as eval expression)

functools.reduce(lambda text, subArguments: re.sub(subArguments[0], subArguments[1], text), [["'", '’'], ['\.{3}', '…'], ['\s+', ' '], ['"(.*?)"', '“\g<1>”'], ['[^-\w,–()[\]#&:;’„”“… ]+', '_'], ['(^[_\s]+|[_\s]+$)', ''], ['^((.{80}).).*$', '\g<2>…']], title)

I can run this off my fork, but I still would like to see this merged in case anyone else needs functools in their eval expressions.

[mikf]

I'll merge this, I think, but since the latest release (1.25.0) you can use the globals option to "add" (#3773) anything to eval scope without having to touch the actual code.