Partial IntelliJ IDEA support

[Grawl]

From version of 15 EAP there is a partial support for ligatures with editor.enable.optional.ligatures=true in bin/idea.properties file.

In OS X, the bin folder is located inside of the application itself, for example: /Applications/IntelliJ IDEA 16 EAP/ Context menu -> Show package content /Contents/bin/idea.properties.

Here is a proof:

As you can see, ligatures appears if there is a letter (not number) beside.

I created a test case for this:

            .=a .-a :=a =:=a
         ==a !=a ===a !==a =/=a

     <<-a <--a <-a b<->a b-> b--> b->>
<=<a <<=a <==a     b<=>a b=> b==> b=>> b>=>
     >>=a >>-a >-a       b-< b-<< b=<<
          <~~a <~a b~~~a b~> b~~>

     <<<a <<a <=a  b<>a  b>= b>> b>>>
               <|a b<|>a b|>

               <$a b<$>a b$>
               <+a b<+>a b+>
               <*a b<*>a b*>

         \\a \\\a b{- -}a b// b///
             /*a /**a b**/ b*/
          </a <!--a www  b--> b/>
            0xF 9:45a m-x *ptr

       ;;a ;;;a ::a :::a !!a !!!a
       ??a ???a %%a %%%a &&a &&&a
       ||a |||a ..a ...a b..< a[]b
       --a ---a ++a +++a **a ***a

          ~=a ~-a -~a =~a ~@a
        ^=a ?=a /=a /==a |=a ||=a
           ##a ###a ####a
         a#{b a#[b a#(b a#?b a#_b a#_(b

a*b a*A B*b A*B *a *A a* A*
a-b a-A B-b A-B -a -A a- A-
a+b a+A B+b A+B +a +A a+ A+
a:b a:A B:b A:B :a :A a: A:

And this is how it looks in IntelliJ IDEA 16 EAP v144.2151.16:

As you can see, every ligature that based on 2 glyphs is working, except of any brackets <>[]{}()

But without letter beside there is nothing as I described above:

So, basically, we can add this info in repository readme.

[dmitriid]

Didn't work for me on 16 EAP :(

[vlad-shatskyi]

@dmitriid, for some reason, it doesn't work for all file types. If you create a new scratch buffer, the ligatures will work.

[dmitriid]

@ShockOne Nope :) Didn't work for the new scratch buffer either :) I guess we can call the support is "spotty". But yay for you! You got it working

[Grawl]

@dmitriid did you forget to add editor.enable.optional.ligatures=true in idea.properties?

[dmitriid]

Nope, done that. Then launched IDEA, all fonts look as they did before. In any type of file, in any type of scratch file

[tonsky]

Heh. Worked for me on Idea 15 with modified idea.properties. For some
reason Idea decided to use Light weight by default, and it only worked with
a letter right after the ligature. Silly

On Tue, Dec 22, 2015 at 3:31 PM dmitriid notifications@github.com wrote:

Nope, done that. Then launched IDEA, all fonts look as they did before. In
any type of file, in any type of scratch file

—
Reply to this email directly or view it on GitHub
#96 (comment).

[tylermenezes]

This isn't actually a fully working test case just yet: there are some problems which only show up when syntax highlighting is used.

[JB-Dmitry]

Hello,

I'm a JetBrains employee, working now on supporting ligatures in IDEA. There's a reason why Fira Code in its current state cannot be supported in IntelliJ IDEA at the moment, some details about this can be found e.g. here. But there's a 'refactoring' for the font, which can make it work.

I could provide a patch, if font's source code would be available in open format, but I don't have Glyphs app, so I can only explain the idea here. Basically, DFLT script tag shouldn't be used in OpenType features mapping, tags for all scripts supported by font should be used instead. For Fira Code this means, 'DFLT dflt' script/language pair should be replaced with 'zyyy dflt' 'zinh dflt' 'cyrl dflt' 'grek dflt' ('latn' script is already declared).

I've tested font modified in such a way, and didn't see any regressions in any editors on any platform so far.

[tonsky]

Hi @JB-Dmitry!

I’ll see what I can do about it.

Does removing DFLT solves the issue when ligatures only render if a letter is placed before/after it?

[JB-Dmitry]

Yes, I think it should solve it.

[tonsky]

@JB-Dmitry here’s a test build https://dl.dropboxusercontent.com/u/561580/Fonts/FiraCode/FiraCode_1.102.zip

I kept languagesystem DFLT dflt; but added what you’ve suggested. Works for me (with addition of editor.enable.optional.ligatures=true) (I use OS X and IDEA 15 community edition).

Folks in this thread, can you please test it in Windows/Linux and report back?

@JB-Dmitry any ideas why Idea chooses Light weight by default and how to change that?

[tylermenezes]

That works for me on Linux! You're all awesome for looking into this so much!

[JB-Dmitry]

I kept languagesystem DFLT dflt; but added what you’ve suggested.

That should also work, thanks.

any ideas why Idea chooses Light weight by default and how to change that?

I couldn't reproduce that. What JDK are you using to run IDEA (can be found in 'About' screen)?

[Grawl]

Works on OS X! Great!

[tonsky]

@JB-Dmitry it must be related to editor.enable.optional.ligatures=true somehow. If I enable it, it starts using Ligth weight for Fira Code, Bold weight for Input Mono, etc. Once I disable it, it chooses correct regular weight for both. Checked on 15 and 16 EAP Ideas (OS X)