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Time-stamp: <2024-02-11 12h13 UTC>
# Finally an APL for my flying saucer?
> Let's postpone the why and what of BQN, and address the how
Suppose that you're interested in using
=> https://mlochbaum.github.io/BQN/index.html BQN
but you're troubled by not having any. Well, if you're an Arch linux and using emacs, the following should see you through
## Building and installing
### CBQN
I found the AUR package for CBQN lacking, in that it didn't compile the shared libraries which i wanted for the LSP integration below. To that end, here's what i'm using
```
$ cat PKGBUILD
# Maintainer: Firegem <mrfiregem [at] protonail [dot] ch>
pkgname=cbqn-git
pkgver=r2743.8c18fddd
pkgrel=1
pkgdesc="A BQN implementation in C."
arch=('x86_64' 'i686' 'aarch64' 'arm')
url="https://github.com/dzaima/CBQN"
license=('Apache' 'Boost' 'GPL3' 'MIT')
depends=('glibc' 'libffi')
optdepends=('ttf-bqn386: BQN and APL compatible font')
makedepends=('git' 'clang')
provides=("${pkgname%-git}")
conflicts=("${pkgname%-git}")
source=("${pkgname%-git}::git+${url}.git")
md5sums=('SKIP')
pkgver() {
cd "${srcdir}/${pkgname%-git}"
printf "r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
}
build() {
cd "${srcdir}/${pkgname%-git}"
make PIE='-pie' o3n
make PIE='-pie' shared-o3
}
package() {
cd "${srcdir}/${pkgname%-git}"
make PREFIX="${pkgdir}/usr/" install
}
```
the changes to build() and package() are minor, but appear to be necessary.
With that it should be possible to install a functioning BQN compiler and REPL.
#### BQN LSP
=> https://git.sr.ht/~detegr/bqnlsp
Cloning and building this should work now that the above PKGBUILD puts /usr/lib/libcbqn.so onto the file system. Not too much to say here, other than copy the resulting bqnlsp into your path somewhere
## Emacs integration
Fortunately for us, all of the hard work has already been done
```
(use-package bqn-mode
:ensure t
:defer
:bind (:map bqn-mode-map
("M-TAB" . expand-abbrev)
("C-c r r" . bqn-comint-eval-dwim)
("C-c r b" . bqn-comint-eval-buffer))
:hook (bqn-mode . (lambda () (eglot-ensure) (bqn-comint-buffer)))
:config
(require 'bqn-keymap-mode)
(require 'bqn-glyph-mode))
```
Note that the first time this is run eglot may ask for the path of bqnlsp, simply provide it.
### Bonus round: abbrev-mode for entering symbols
At first when using BQN i found that while i could remember the names of the various glyphs in which i was interested, i could not recall where they were on the "BQN Keyboard"---a task not aided by the fact that i don't use QWERTY⁰. To that end i wrote some abbrev aliases so that i could type the names and press either space or whatever the favourite abbrev trigger was to replace the word with the glyph
```
(define-abbrev-table 'bqn-mode-abbrev-table
'( ;; funtions
("abs" "│")
("assert" "!")
("ceiling" "⌈")
("classify" "⊐")
("conj" "∧")
("couple" "≍")
("deduplicate" "⍷")
("depth" "≡")
("deshape" "⥊")
("dgrade" "⍒")
("disj" "∨")
("divide" "÷")
("drop" "↓")
("dsort" "∧")
("enlist" "⋈")
("find" "⍷")
("floor" "⌊")
("group" "⊔")
("gt" ">")
("gte" "≥")
("indices" "/")
("join" "∾")
("left" "⊣")
("length" "≠")
("lshift" "«")
("lt" "<")
("lte" "≤")
("match" "≡")
("maximum" "⌈")
("member" "∊")
("minimum" "⌊")
("minus" "¯")
("modulus" "│")
("multiply" "×")
("neg" "¬")
("neq" "≠")
("nmatch" "≢")
("occurrence" "⊒")
("pair" "⋈")
("pick" "⊑")
("power" "⋆")
("prefix" "↑")
("range" "↕")
("recip" "÷")
("replicate" "/")
("reshape" "⥊")
("reverse" "⌽")
("right" "⊢")
("root" "√")
("rshift" "»")
("select" "⊏")
("shape" "≢")
("sign" "×")
("solo" "≍")
("span" "¬")
("sqrt" "√")
("suffix" "↓")
("take" "↑")
("transpose" "⍉")
("ugrade" "⍋")
("usort" "∨")
;; combinators
("atop" "∘")
("catch" "⎊")
("choose" "◶")
("constant" "˙")
("lhook" "⊸")
("over" "○")
("rhook" "⟜")
("self" "˜")
("swap" "˜")
("under" "⌾")
("valence" "⊘")
;; 1-modifiers
("cell" "˘")
("each" "¨")
("fold" "´")
("insert" "˝")
("scan" "`")
("table" "⌜")
("undo" "⁼")
;; 2-modifiers
("depth" "⚇")
("rank" "⎉")
("repeat" "⍟")
;; syntax
("define" "←")
("export" "⇐")
("change" "↩")
("nothing" "·")
("sep" "⋄")
;; constants
("pi" "π")
("infty" "∞")))
```
to make this not irritating i found myself also setting
```
(setq save-abbrevs 'silently)
```
and adding (abbrev-mode) to the bqn-mode hook.
Happy BQN'ing!
---
⁰ For the curious
=> https://git.sr.ht/~tslil/keyboard
|
