Improve CMake project

[podsvirov]

Try it:

> git clone -b cmake https://github.com/podsvirov/discount.git
> cd discount
> cmake cmake/
> make

[Orc]

I can't pull that as is, because it #defines strcase?cmp as str?cmp on non-windows machines. Surely cmake has a way to test for the existance of strcasecmp and strncasecmp?

[Orc]

And, also,

orc@pie(discount)> cmake
-ksh: cmake: not found

There's no way for me to test cmake environments, because I don't have cmake installed on any of my build & test machines. cmake, like plan9 & other windows-specific build configurations, are taken on faith after checking for unpleasant surprises.

[podsvirov]

What OS on your build & test machines?

[Orc]

Darwin, FreeBSD, Debian, and Centos. Cmake free by preference.

[podsvirov]

CMake can check the existance of strcasecmp and strncasecmp. I work on this now.

[podsvirov]

On my server with Debian to install cmake I simple type:

> sudo apt-get install cmake

[Orc]

If I wanted cmake I'm sure I could install it on everything (except maybe the FreeBSD machine.)

[podsvirov]

@Orc, I add more system checks. Please review again.

[Orc]

One thing I noticed in the latest patch; you're #define'ing HAVE_{symbol} to 0 for a handful of things if they don't exist; you shouldn't do that -- I try to use #if for all of the HAVE_{symbol} checks, but there are a handful of places where it's still a #ifdef & even when I fix them I want to reserve any symbol definition for symbols that exist just in case I run into a cpp somewhere that pukes on either #if with a nonexistant symbol or even #if all by itself.

[podsvirov]

Ok. Fixed. Please review.

[podsvirov]

Funny bonus. With these changes I was able to build and test the markdown.js via emcc compiler (Emscripten project).
And from emsdk command prompt on Windows I type (and it's work):

> type syntex.text | node markdown.js > syntex.html

[Orc]

It's amusing that the js crosscompiler works as well. I'll have to spin up a vm and take a look at it.

[podsvirov]

I think that vm it's not necessary. This is a cross-platform project. Installation instructions for all supported platforms are available on the site.

[Orc]

It's a lot easier to spin up a vm than to install an OS onto physical hardware; most (maybe all?) of the vm supervisors out there implement machines with middle of the road (and well-supported) hardware, plus there's no need to mess around with physical install media.

[podsvirov]

Of course, do as you please. I spoke more about the operating system.

[podsvirov]

The goal can be not only a clean JavaScript script, but also a WebAssembly module.
I plan to try your library on the client side (in the browser) also expect it to work.