First version of erc-checker for HTML files, images only

[Timmimim]

What I have done so far:

• built a CLI tool that visually compares two HTML files, containing the same number of images, created from a .Rmd file;

  • made same tool available as a node module, exported as "ercChecker";
  • if the files are comparable, saves a .html-file with highlighted differences in images
  • output diff-HTML is currently saved by default to the root of the erc-checker directory
  • tool offers option to set an output path as parameter

• built a Bash script which extracts the main.html from any ERC's image.tar file

  • extracts image.tar content to temp directory (piping output from tar to tar, and from there to cp did not work)
  • extracts each layer (no saving) and pipes content to cp, which tries to extract erc/main.html
  • result is saved to original_papers directory, while temp files of image are deleted
  • uses erc_id and path to erc as parameters, plus optionally a name for the .html-file, if it is called anything but "main.html"

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Next planned steps will be:

1. ERC execution and retrieving the reproduced HTML paper
2. defining output locations for original, reproduced and diff-ed HTML files, plus name-conventions; current output locations are only chosen for testing
3. at some point updating the main README.md to a reasonable level

[nuest]

I understand your excitement, but please change the title of the PR to something more descriptive and consequently more useful.

[nuest]

So, I assume the tests are still under development. Looking forward to see updates on this PR.

Another question: _Why is SH_Script_Extract_Original_Paper_Before_Container-Start/extract_original_paper_from_ERC.sh a shell script and not written in JavaScript?_

[Timmimim]

Tests are under development, I have not worked with Mocha before and am learning it now. Along with writing tests, I will change the name and structure of the current test-files directory.

_extract_original_paper_from_ERC.sh_ was built as a shell script during development to speed up the task of, well, extracting the original paper from the image.tar file of any ERC. It can be rewritten to JavaScript, of course, and I will do so ASAP.

Then, after rewriting the shell script into JS and writing tests, I will update the README.md file.

[nuest]

Well, if the shell script is only a util script for development, then I am fine with it being a shell script! It was just not clear to me if that script was targeted at developers or users.

I'd recommend leaving it a shell script then, but not documenting it in the main README not to confuse regular users... maybe add a developer readme, and put the shell script into a dir /etc ?

[Timmimim]

README.md is updated, and test/ now includes a test for the check request handling in index.js.