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;;; private/grfn/splitjoin.el -*- lexical-binding: t; -*-
(require 'dash)
(load! "utils")
;;;
;;; Vars
;;;
(defvar +splitjoin/split-callbacks '()
"Alist mapping major mode symbol names to lists of split callbacks")
(defvar +splitjoin/join-callbacks '()
"Alist mapping major mode symbol names to lists of join callbacks")
;;;
;;; Definition macros
;;;
(defmacro +splitjoin/defsplit (mode name &rest body)
`(setf
(alist-get ',name (alist-get ,mode +splitjoin/split-callbacks))
(λ! () ,@body)))
(defmacro +splitjoin/defjoin (mode name &rest body)
`(setf
(alist-get ',name (alist-get ,mode +splitjoin/join-callbacks))
(λ! () ,@body)))
;;;
;;; Commands
;;;
(defun +splitjoin/split ()
(interactive)
(when-let (callbacks (->> +splitjoin/split-callbacks
(alist-get major-mode)
(-map #'cdr)))
(find-if #'funcall callbacks)))
(defun +splitjoin/join ()
(interactive)
(when-let (callbacks (->> +splitjoin/join-callbacks
(alist-get major-mode)
(-map #'cdr)))
(find-if #'funcall callbacks)))
;;;
;;; Splits and joins
;;; TODO: this should probably go in a file-per-language
;;;
(+splitjoin/defjoin
'elixir-mode
join-do
(let* ((function-pattern (rx (and (zero-or-more whitespace)
"do"
(zero-or-more whitespace)
(optional (and "#" (zero-or-more anything)))
eol)))
(end-pattern (rx bol
(zero-or-more whitespace)
"end"
(zero-or-more whitespace)
eol))
(else-pattern (rx bol
(zero-or-more whitespace)
"else"
(zero-or-more whitespace)
eol))
(lineno (line-number-at-pos))
(line (thing-at-point 'line t)))
(when-let ((do-start-pos (string-match function-pattern line)))
(cond
((string-match-p end-pattern (get-line (inc lineno)))
(modify-then-indent
(goto-line-char do-start-pos)
(insert ",")
(goto-char (line-end-position))
(insert ": nil")
(line-move 1)
(delete-line))
t)
((string-match-p end-pattern (get-line (+ 2 lineno)))
(modify-then-indent
(goto-line-char do-start-pos)
(insert ",")
(goto-char (line-end-position))
(insert ":")
(join-line t)
(line-move 1)
(delete-line))
t)
((and (string-match-p else-pattern (get-line (+ 2 lineno)))
(string-match-p end-pattern (get-line (+ 4 lineno))))
(modify-then-indent
(goto-line-char do-start-pos)
(insert ",")
(goto-char (line-end-position))
(insert ":")
(join-line t)
(goto-eol)
(insert ",")
(join-line t)
(goto-eol)
(insert ":")
(join-line t)
(line-move 1)
(delete-line))
t)))))
(comment
(string-match (rx (and bol
"if "
(one-or-more anything)
","
(zero-or-more whitespace)
"do:"
(one-or-more anything)
","
(zero-or-more whitespace)
"else:"
(one-or-more anything)))
"if 1, do: nil, else: nil")
)
(+splitjoin/defsplit
'elixir-mode
split-do-with-optional-else
(let* ((if-with-else-pattern (rx (and bol
(one-or-more anything)
","
(zero-or-more whitespace)
"do:"
(one-or-more anything)
(optional
","
(zero-or-more whitespace)
"else:"
(one-or-more anything)))))
(current-line (get-line)))
(when (string-match if-with-else-pattern current-line)
(modify-then-indent
(assert (goto-regex-on-line ",[[:space:]]*do:"))
(delete-char 1)
(assert (goto-regex-on-line ":"))
(delete-char 1)
(insert "\n")
(when (goto-regex-on-line-r ",[[:space:]]*else:")
(delete-char 1)
(insert "\n")
(assert (goto-regex-on-line ":"))
(delete-char 1)
(insert "\n"))
(goto-eol)
(insert "\nend"))
t)))
(comment
(+splitjoin/defsplit 'elixir-mode split-def
(let ((function-pattern (rx (and ","
(zero-or-more whitespace)
"do:")))
(line (thing-at-point 'line t)))
(when-let (idx (string-match function-pattern line))
(let ((beg (line-beginning-position))
(orig-line-char (- (point) (line-beginning-position))))
(save-mark-and-excursion
(goto-line-char idx)
(delete-char 1)
(goto-line-char (string-match ":" (thing-at-point 'line t)))
(delete-char 1)
(insert "\n")
(goto-eol)
(insert "\n")
(insert "end")
(evil-indent beg (+ (line-end-position) 1))))
(goto-line-char orig-line-char)
t))))
(+splitjoin/defjoin
'elixir-mode
join-if-with-else
(let* ((current-line (thing-at-point 'line)))))
(provide 'splitjoin)
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