;;; racket-unicode-input-method.el -*- lexical-binding: t; -*-

;; Copyright (c) 2015-2020 by Greg Hendershott
;; Portions Copyright (c) 2010-2011 by Roel van Dijk

;; Author: Greg Hendershott
;; URL: https://github.com/greghendershott/racket-mode

;; SPDX-License-Identifier: GPL-3.0-or-later

;; Following the example of haskell-unicode-input-method.el

(require 'quail)

;;;###autoload
(defun racket-unicode-input-method-enable ()
  "Set input method to racket-unicode.

The racket-unicode input method lets you easily type various
Unicode symbols that might be useful when writing Racket code.

To automatically enable the racket-unicode input method in
racket-mode and racket-repl-mode buffers, put the following code
in your Emacs init file:

#+BEGIN_SRC elisp
    (add-hook \\='racket-mode-hook #\\='racket-unicode-input-method-enable)
    (add-hook \\='racket-repl-mode-hook #\\='racket-unicode-input-method-enable)
#+END_SRC

To temporarily enable this input method for a single buffer you
can use \"M-x racket-unicode-input-method-enable\".

Use the standard Emacs key C-\\ to toggle the input method.

When the racket-unicode input method is active, you can for
example type \"All\" and it is immediately replaced with \"∀\". A
few other examples:

| omega     | ω                        |
| x_1       | x₁                       |
| x^1       | x¹                       |
| A         | 𝔸                        |
| test-->>E | test-->>∃ (racket/redex) |
| vdash     | ⊢                        |

To see a table of all key sequences use \"M-x
describe-input-method <RET> racket-unicode\".

If you want to add your own mappings to the \"racket-unicode\"
input method, you may add code like the following example in your
Emacs init file:

#+BEGIN_SRC elisp
    ;; Either (require \\='racket-mode) here, or, if you use
    ;; use-package, put the code below in the :config section.
    (with-temp-buffer
      (racket-unicode-input-method-enable)
      (set-input-method \"racket-unicode\")
      (let ((quail-current-package (assoc \"racket-unicode\"
                                          quail-package-alist)))
        (quail-define-rules ((append . t))
                            (\"^o\" [\"ᵒ\"]))))
#+END_SRC

If you don’t like the highlighting of partially matching tokens you
can turn it off by setting `input-method-highlight-flag' to nil."
  (interactive)
  (set-input-method "racket-unicode"))

(quail-define-package
 "racket-unicode"                       ;name
 "UTF-8"                                ;language
 "λ"                                    ;title (in mode line)
 t                                      ;guidance
 "Racket Unicode input method."         ;docstring
 nil                                    ;translation-keys
 nil                                    ;forget-last-selection
 nil                                    ;deterministic
 nil                                    ;kbd-translate
 nil                                    ;show-layout
 nil                                    ;create-decode-map
 nil                                    ;maximum-shortest
 nil                                    ;overlay-plist
 nil                                    ;update-translation-function
 nil                                    ;conversion-keys
 t)                                     ;simple

(quail-define-rules
 ;; Typed Racket
 ("All "          ["∀"])
 ("Union "        ["U"])
 ("Intersection " ["∩"])

 ;; Redex
 ("test-->>E "    ["test-->>∃"])

 ;; Turnstile
 ("vdash "        ["⊢"])
 ("gg "           ["≫"])
 ("rightarrow "   ["→"])
 ("Rightarrow "   ["⇒"])
 ("Leftarrow "    ["⇐"])
 ("succ "         ["≻"])

 ;; Other type rule symbols
 ;; (added: common math chars currently unsupported)
 ("times "              ["×"])
 ("Uparrow "            ["⇑"])
 ("Downarrow "          ["⇓"])
 ("Leftrightarrow "     ["⇔"])
 ("rightarrow "         ["→"])
 ("leftarrow "          ["←"])
 ("Rightarrow "         ["⇒"])
 ("Leftarrow "          ["⇐"])
 ("nwarrow "            ["↖"])
 ("nearrow "            ["↗"])
 ("uparrow "            ["↑"])
 ("downarrow "          ["↓"])
 ("searrow "            ["↘"])
 ("swarrow "            ["↙"])
 ("leftrightarrow "     ["↔"])
 ("updownarrow "        ["⇕"])
 ("aleph "              ["א"])
 ("emptyset "           ["∅"])
 ("nabla "              ["∇"])
 ("surd "               ["√"])
 ("negation "           ["¬"])
 ("infinity "           ["∞"])
 ("prod "               ["∏"])
 ("coprod"              ["∐"])
 ("integrate "          ["∫"])
 ("oint "               ["∮"])
 ("vee "                ["∨"])
 ("wedge "              ["∧"])
 ("follows "            ["∘"])
 ("setin "              ["∈"])
 ("ni "                 ["∋"])
 ("notin "              ["∉"])
 ("sqsubset "           ["⊏"])
 ("sqsupset "           ["⊐"])
 ("sqsubseteq "         ["⊑"])
 ("sqsupseteq "         ["⊒"])
 ("subset "             ["⊂"])
 ("superset "           ["⊃"])
 ("subseteq "           ["⊆"])
 ("supseteq "           ["⊇"])
 ("approx "             ["≈"])
 ("cong "               ["≌"])
 ("neq "                ["≠"])
 ("sqcap "              ["⊓"])
 ("sqcup "              ["⊔"])
 ("models "             ["⊧"])

 ;; Greek letters
 ("alpha "        ["α"])
 ("Alpha "        ["Α"])
 ("beta "         ["β"])
 ("Beta "         ["Β"])
 ("gamma "        ["γ"])
 ("Gamma "        ["Γ"])
 ("delta "        ["δ"])
 ("Delta "        ["Δ"])
 ("epsilon "      ["ε"])
 ("Epsilon "      ["Ε"])
 ("zeta "         ["ζ"])
 ("Zeta "         ["Ζ"])
 ("eta "          ["η"])
 ("Eta "          ["Η"])
 ("theta "        ["θ"])
 ("Theta "        ["Θ"])
 ("iota "         ["ι"])
 ("Iota "         ["Ι"])
 ("kappa "        ["κ"])
 ("Kappa "        ["Κ"])
 ("lambda "       ["λ"])
 ("Lambda "       ["Λ"])
 ("lamda "        ["λ"])
 ("Lamda "        ["Λ"])
 ("mu "           ["μ"])
 ("Mu "           ["Μ"])
 ("nu "           ["ν"])
 ("Nu "           ["Ν"])
 ("xi "           ["ξ"])
 ("Xi "           ["Ξ"])
 ("omicron "      ["ο"])
 ("Omicron "      ["Ο"])
 ("pi "           ["π"])
 ("Pi "           ["Π"])
 ("rho "          ["ρ"])
 ("Rho "          ["Ρ"])
 ("sigma "        ["σ"])
 ("Sigma "        ["Σ"])
 ("tau "          ["τ"])
 ("Tau "          ["Τ"])
 ("upsilon "      ["υ"])
 ("Upsilon "      ["Υ"])
 ("phi "          ["φ"])
 ("Phi "          ["Φ"])
 ("chi "          ["χ"])
 ("Chi "          ["Χ"])
 ("psi "          ["ψ"])
 ("Psi "          ["Ψ"])
 ("omega "        ["ω"])
 ("Omega "        ["Ω"])
 ("digamma "      ["ϝ"])
 ("Digamma "      ["Ϝ"])
 ("san "          ["ϻ"])
 ("San "          ["Ϻ"])
 ("qoppa "        ["ϙ"])
 ("Qoppa "        ["Ϙ"])
 ("sampi "        ["ϡ"])
 ("Sampi "        ["Ϡ"])
 ("stigma "       ["ϛ"])
 ("Stigma "       ["Ϛ"])
 ("heta "         ["ͱ"])
 ("Heta "         ["Ͱ"])
 ("sho "          ["ϸ"])
 ("Sho "          ["Ϸ"])

 ;; Double-struck letters
 ("|A|"           ["𝔸"])
 ("|B|"           ["𝔹"])
 ("|C|"           ["ℂ"])
 ("|D|"           ["𝔻"])
 ("|E|"           ["𝔼"])
 ("|F|"           ["𝔽"])
 ("|G|"           ["𝔾"])
 ("|H|"           ["ℍ"])
 ("|I|"           ["𝕀"])
 ("|J|"           ["𝕁"])
 ("|K|"           ["𝕂"])
 ("|L|"           ["𝕃"])
 ("|M|"           ["𝕄"])
 ("|N|"           ["ℕ"])
 ("|O|"           ["𝕆"])
 ("|P|"           ["ℙ"])
 ("|Q|"           ["ℚ"])
 ("|R|"           ["ℝ"])
 ("|S|"           ["𝕊"])
 ("|T|"           ["𝕋"])
 ("|U|"           ["𝕌"])
 ("|V|"           ["𝕍"])
 ("|W|"           ["𝕎"])
 ("|X|"           ["𝕏"])
 ("|Y|"           ["𝕐"])
 ("|Z|"           ["ℤ"])
 ("|gamma|"       ["ℽ"])
 ("|Gamma|"       ["ℾ"])
 ("|pi|"          ["ℼ"])
 ("|Pi|"          ["ℿ"])

 ;; Quantifiers
 ("forall "       ["∀"])
 ("exists "       ["∃"])

 ;; Numeric subscripts
 ("_0 "           ["₀"])
 ("_1 "           ["₁"])
 ("_2 "           ["₂"])
 ("_3 "           ["₃"])
 ("_4 "           ["₄"])
 ("_5 "           ["₅"])
 ("_6 "           ["₆"])
 ("_7 "           ["₇"])
 ("_8 "           ["₈"])
 ("_9 "           ["₉"])

 ;; Numeric superscripts
 ("^0 "           ["⁰"])
 ("^1 "           ["¹"])
 ("^2 "           ["²"])
 ("^3 "           ["³"])
 ("^4 "           ["⁴"])
 ("^5 "           ["⁵"])
 ("^6 "           ["⁶"])
 ("^7 "           ["⁷"])
 ("^8 "           ["⁸"])
 ("^9 "           ["⁹"]))

(provide 'racket-unicode-input-method)

;;; racket-unicode-input-method.el ends here
