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ft_raku.txt   The Raku programming language filetype

                                                      vim-raku

Vim-raku provides syntax highlighting, indentation, and other support for
editing Raku programs.

1. Using Unicode in your Raku files     raku-unicode

==============================================================================
1. Using Unicode in your Raku files                           raku-unicode

Defining new operators using Unicode symbols is a good way to make your
Raku program easy to read. See:
https://perl6advent.wordpress.com/2012/12/18/day-18-formulas-resistance-is-futile/

While Raku does define ASCII alternatives for some common operators (see
https://docs.raku.org/language/unicode_ascii), using the full range of
Unicode operators is highly desirable. Your operating system provides input
facilities, but using the features built in to Vim may be preferable.

The natural way to produce these symbols in Vim is to use digraph shortcuts
(:help digraphs-use). Many of them are defined; type :digraphs to get
the list. A convenient way to read the list of digraphs is to save them in a
file. From the shell: 
        vim +'redir >/tmp/vim-digraphs-listing.txt' +digraphs +'redir END' +q

Some of them are available with standard Vim digraphs:
        << «    /0 ∅    !< ≮  
        >> »    Ob ∘    !> ≯  
        ., …    00 ∞    (C ⊂  
        (U ∩    -: ÷    )C ⊃  
        )U ∪    (_ ⊆    >= ≥  
        ?= ≅    )_ ⊇    =< ≤  
        (- ∈    ?= ≅    != ≠  
        -) ∋    ?- ≃  

The Greek alphabet is available with '*' followed by a similar Latin symbol:
        *p π  
        *t τ  
        *X ×  

Numbers, subscripts and superscripts are available with 's' and 'S':
        0s ₀    0S ⁰  
        1s ₁    1S ¹  
        2s ₂    9S ⁹  

But some don't come defined by default. Those are digraph definitions you can
add in your ~/.vimrc file. 
        exec 'digraph \\ '.char2nr('∖')
        exec 'digraph \< '.char2nr('≼')
        exec 'digraph \> '.char2nr('≽')
        exec 'digraph (L '.char2nr('⊈')
        exec 'digraph )L '.char2nr('⊉')
        exec 'digraph (/ '.char2nr('⊄')
        exec 'digraph )/ '.char2nr('⊅')
        exec 'digraph )/ '.char2nr('⊅')
        exec 'digraph U+ '.char2nr('⊎')
        exec 'digraph 0- '.char2nr('⊖')
        " Euler's constant
        exec 'digraph ne '.char2nr('𝑒')
        " Raku's atomic operations marker
        exec 'digraph @@ '.char2nr('⚛')

Alternatively, you can write Insert mode abbreviations that convert ASCII-
based operators into their single-character Unicode equivalent. 
        iabbrev <buffer> !(<) ⊄
        iabbrev <buffer> !(<=) ⊈
        iabbrev <buffer> !(>) ⊅
        iabbrev <buffer> !(>=) ⊉
        iabbrev <buffer> !(cont) ∌
        iabbrev <buffer> !(elem) ∉
        iabbrev <buffer> != ≠
        iabbrev <buffer> (&) ∩
        iabbrev <buffer> (+) ⊎
        iabbrev <buffer> (-) ∖
        iabbrev <buffer> (.) ⊍
        iabbrev <buffer> (<) ⊂
        iabbrev <buffer> (<+) ≼
        iabbrev <buffer> (<=) ⊆
        iabbrev <buffer> (>) ⊃
        iabbrev <buffer> (>+) ≽
        iabbrev <buffer> (>=) ⊇
        iabbrev <buffer> (\|) ∪
        iabbrev <buffer> (^) ⊖
        iabbrev <buffer> (atomic) ⚛
        iabbrev <buffer> (cont) ∋
        iabbrev <buffer> (elem) ∈
        iabbrev <buffer> * ×
        iabbrev <buffer> **0 ⁰
        iabbrev <buffer> **1 ¹
        iabbrev <buffer> **2 ²
        iabbrev <buffer> **3 ³
        iabbrev <buffer> **4 ⁴
        iabbrev <buffer> **5 ⁵
        iabbrev <buffer> **6 ⁶
        iabbrev <buffer> **7 ⁷
        iabbrev <buffer> **8 ⁸
        iabbrev <buffer> **9 ⁹
        iabbrev <buffer> ... …
        iabbrev <buffer> / ÷
        iabbrev <buffer> << «
        iabbrev <buffer> <<[=]<< «=«
        iabbrev <buffer> <<[=]>> «=»
        iabbrev <buffer> <= ≤
        iabbrev <buffer> =~= ≅
        iabbrev <buffer> >= ≥
        iabbrev <buffer> >> »
        iabbrev <buffer> >>[=]<< »=«
        iabbrev <buffer> >>[=]>> »=»
        iabbrev <buffer> Inf ∞
        iabbrev <buffer> atomic-add-fetch ⚛+=
        iabbrev <buffer> atomic-assign ⚛=
        iabbrev <buffer> atomic-fetch ⚛
        iabbrev <buffer> atomic-dec-fetch --⚛
        iabbrev <buffer> atomic-fetch-dec ⚛--
        iabbrev <buffer> atomic-fetch-inc ⚛++
        iabbrev <buffer> atomic-inc-fetch ++⚛
        iabbrev <buffer> atomic-sub-fetch ⚛−=
        iabbrev <buffer> e 𝑒
        iabbrev <buffer> o ∘
        iabbrev <buffer> pi π
        iabbrev <buffer> set() ∅
        iabbrev <buffer> tau τ

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