Ö

Ö is a programming language with a weird-ish syntax.

<Akuli>      i like how 'ding = (dang dong)' translates to 'ding = dang(dong)',
             just move the ( to the right side of the function name
<Zaab1t>     haha
<Zaab1t>     syntax is odd yeah

Hello World!

Install make, a C compiler and git. For example, if you're using a Debian-based Linux distribution like Ubuntu or Mint, run this command:

$ sudo apt install gcc make git libreadline-dev

You don't need to install libreadline-dev, but if you install it, the interactive REPL will have features that you expect it to have, like pressing arrow up to go to the previously entered line.

Next you can download and compile the interpreter.

$ git clone https://github.com/akuli/odotdot
$ cd odotdot
$ ./configure
$ make -j2

You should get lots of output, but no errors.

Save this code to hello.ö...

var msg = "Hellö Wörld!";
print msg;

...and run it:

$ ./ö hello.ö
Hellö Wörld!

See the tutorial for more. There's also an examples directory and more documentation.

FAQ

How do I type ö?

With the ö key. It's right next to the ä key.

How do I spell ö?

https://www.youtube.com/watch?v=HiUDj6jTgTY

Why did you name the programming language Ö?

Ö is used quite often in Finnish, and people who aren't used to it think that it looks like a face with mouth fully opened.

<Zaab1t>       looks like someone scared
<Zaab1t>       ö

See also David Beazley's Meẗal.

Why is the repository named odotdot instead of ö?

Because github.

Is there a REPL?

Yes, run ./ö without any arguments.

$ ./ö
ö> print "hellö wörld!";
hellö wörld!
ö>

This is actually more like a REL (Read-Eval-Loop) than a REPL (Read-Eval-Print-Loop) because it doesn't print anything by itself...

ö> 1+2
...a funny error message...

...and you need to print things explicitly:

ö> debug (1+2);
3
ö>

The "funny error message" is not like it should be. It should be a syntax error, but instead it crashes the whole interpreter. This is a bug that I'll hopefully fix some day.

You can press Ctrl+C or Ctrl+D to get out of the REPL.

I have a nice idea for Ö. Can you implement it?

Maybe. Create a GitHub issue.

Tests

This stuff is for people who want to develop my Ö interpreter (it's awesome if you do, please let me know!) or are just interested in how stuff works.

Some of the tests are written in C and some tests are written in Ö. tests.Makefile is a Makefile that compiles and runs all tests, and you can use it like this:

$ make -f tests.Makefile

Compiling the interpreter with just make also runs the tests. Run make ö to compile without testing.

If a test fails, you can run just that test like this:

$ make -f tests.Makefile ötests/test_array.ö

You can also pass these options to make:

• VALGRIND=valgrind runs all tests using a valgrind executable named valgrind. The executable must be in $PATH or a full path.
• -j2 runs the tests in parallel, at most 2 tests at a time. This speeds up testing a lot, especially if you use valgrind. You can put any number you want after -j; usually the number of processors your system has is good.

I'm not using a coverage tool because I don't know how to use any C coverage tools, and there are much more important things to fix than bad coverage; see my huge TODO list.