Note: I have started this project primarily to validate the html generated by asciidoctor, but noticed that asciidoctor v1.5.6 and later implements the -v switch to provide build-time validation. See official documentation

This simple script provides function to validate internal link in html.

1. Download this script

2. Import

3. Just use.
   Here's a example usage.

   $ git clone https://github.com/kkimurak/vasil-sh.git
   
   $ cd vasil-sh
   
   $ tree
   .
   ├── README.md
   ├── test
   |   └── sample.html
   └── vasil.sh
   1 directory, 3 files
   
   $ vasil.sh test/sample.html
   
   $ echo $?
   5

   Note that offset is added to returning value if at least one invalid link found, to avoid conflict with other error message (e.g. 2 means "no such file").
   Please refer variable vasil_return_offset.

   You can set VASIL_DEBUG=true to see debug message

   $ VASIL_DEBUG=true sh vasil.sh test/sample.html
   link "invalid_link" is invalid
   link "link containing white space" is invalid
   2 invalid link found

   If you want to import function using source, set VASIL_USE_AS_FUNCTION to true and then do that.
   source is not specified in POSIX, so I'm not sure if it works for you.
   It works on my Fedora, but not works on Travis.

   $ VASIL_USE_AS_FUNCTION=true
   
   $ source vasil.sh && vasil_main test/sample.html
   
   $ echo $?
   5

k.kimura (@kkimurak)