Restore ability to use STDIN

[kesara]

Restore ability to use standard input for svgcheck.
This functionality was unintentionally removed in #28.

[larseggert]

We need a test suite :-)

[kesara]

We need a test suite :-)

I assume that you are talking about a test suite that covers all popular tools used by the community.

[rjsparks]

I really hope the path to redefining what svg is acceptable is opening. It would be a much better investment to build a more maintainable checker against those rules than continuing to build infrastructure around a set of rules we know we're going to leave. (And to be explicit, I would expect to write something new for those rules rather than adjust this current implementation).

[hoehrmann]

The problem is this line

svgcheck/svgcheck/run.py

Line 110 in 40c2914

source = os.getcwd() + "/stdin"

- it looks for a "stdin" file in the current working directory instead of reading from the moral equivalent of /dev/stdin.

(Via cabo/kramdown-rfc#233)

[rfc2822]

(Via cabo/kramdown-rfc#233)

Replacing the line in run.py by

    if len(args) < 1:
        source = "/dev/stdin"

as mentioned there works for me.