Rename .titan extension and directory titan-compiler

[pjpollina]

As per the 3rd and 4th objective of Issue #22

[hugomg]

Thanks for showing interest in helping us with this issue.

Please let us know if you need assistance in getting the test suite to run on your machine. It has a shorter feedback loop than Travis :)

[pjpollina]

That'd be great, yeah. I really wanna know why this keeps failing.

[hugomg]

1. First of all, you need to make sure that you have the Luarocks package manager installed on your machine.

2. To be able to run the pallene compiler you need to install its dependencies:

luarocks install --local --only-deps pallene-dev-1.rockspec

3. You also need to be able to build the runtime library and our modified version of Lua 5.4. Currently our makefile only works on Linux and Mac. If on Linux, make sure that you have the dev headers for the readline library installed (sudo apt install readline-dev, or equivalent for your distro)

make linux-readline  # for linux
make macosx          # for macos

4. Assuming I wrote everything correctly here, you should now be able to run Pallene. (Do all of these from the root project directory, as per bug Allow the compiler to be called from any directory #16).

# running the compiler
./pallenec foo.pallene
./lua/src/lua -l foo

5. To run the test suite you need to install Busted. You should be able to do so with Luarocks:

luarocks install --local busted

6. Run busted to run the full test suite (or just one of the tests)

busted                       # run all tests
busted spec/parser_spec.lua  # run just one of the test files

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Please let me know if this works for you or not. If it does, I'll fix our README file to use these instructions.

BTW, you don't need to close and reopen this PR all the time. Travis already informs us when the PR is broken and needs to be fixed so you don't need to do that yourself.

[pjpollina]

Thanks! I got this pull working but I'll definitely use that for my future contributions :D

[hugomg]

I ran this PR locally and noticed that there are some problems that were not caught by the test suite. Could you please try fixing them?

1. In our test cases in the spec directory there are many cases where we create a "test.titan" file as input. It should be "test.pallene" now.
2. The compiler still assumes that the file extension must be ".titan" and produces an error otherwise. We should make the appropriate changes to pallenec and driver.lua to reflect this.
3. The "titanc_spec.lua" file should be renamed to "pallenec_spec.lua"
4. The "run_benchmarks" script also assumes that the file extension is "titan". It needs to be updated to the new file extension.

[pjpollina]

Sure thing!

[hugomg]

Thanks a lot for the help! I think we need just a pair of small changes before merging this PR:

1. Fix the comments on driver.lua, as per previous comment
2. Replace "titan" with "pallene" in the .editorconfig file.

[hugomg]

These need to become compile("pallene", "so", "foo.pallene") and compile("pallene", "c", "foo.pallene")

[pjpollina]

Got it, will do.

[pjpollina]

Think I got them all.

[hugomg]

Thanks!

By the way, have you tried running the test suite on your side? I'm rewriting the README right now so I'd love if you could confirm if the instructions worked.