3c8e6f0cc5
Finally ported my up-to-date emacs configuration here. I was putting this off for a long while, unsure of how to handle all of the work. All it took was my laptop being fried to force me to do this. So... voila!
304 lines
12 KiB
EmacsLisp
304 lines
12 KiB
EmacsLisp
;;; reason-indent.el --- Indentation functions for ReasonML -*-lexical-binding: t-*-
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;; Portions Copyright (c) 2015-present, Facebook, Inc. All rights reserved.
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;;; Commentary:
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;; Indentation functions for Reason.
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;;; Code:
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(defconst reason-re-ident "[[:word:][:multibyte:]_][[:word:][:multibyte:]_[:digit:]]*")
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(defcustom reason-indent-offset 2
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"Indent Reason code by this number of spaces."
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:type 'integer
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:group 'reason-mode
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:safe #'integerp)
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(defun reason-looking-back-str (str)
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"Like `looking-back' but for fixed strings rather than regexps.
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Works around some regexp slowness.
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Argument STR string to search for."
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(let ((len (length str)))
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(and (> (point) len)
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(equal str (buffer-substring-no-properties (- (point) len) (point))))))
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(defun reason-paren-level ()
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"Get the level of nesting inside parentheses."
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(nth 0 (syntax-ppss)))
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(defun reason-in-str-or-cmnt ()
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"Return whether point is currently inside a string or a comment."
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(nth 8 (syntax-ppss)))
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(defun reason-rewind-past-str-cmnt ()
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"Rewind past string or comment."
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(goto-char (nth 8 (syntax-ppss))))
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(defun reason-rewind-irrelevant ()
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"Rewind past irrelevant characters (whitespace of inside comments)."
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(interactive)
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(let ((starting (point)))
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(skip-chars-backward "[:space:]\n")
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(if (reason-looking-back-str "*/") (backward-char))
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(if (reason-in-str-or-cmnt)
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(reason-rewind-past-str-cmnt))
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(if (/= starting (point))
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(reason-rewind-irrelevant))))
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(defun reason-align-to-expr-after-brace ()
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"Align the expression at point to the expression after the previous brace."
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(save-excursion
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(forward-char)
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;; We don't want to indent out to the open bracket if the
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;; open bracket ends the line
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(when (not (looking-at "[[:blank:]]*\\(?://.*\\)?$"))
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(when (looking-at "[[:space:]]")
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(forward-word 1)
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(backward-word 1))
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(current-column))))
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(defun reason-align-to-prev-expr ()
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"Align the expression at point to the previous expression."
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(let ((alignment (save-excursion
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(forward-char)
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;; We don't want to indent out to the open bracket if the
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;; open bracket ends the line
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(when (not (looking-at "[[:blank:]]*\\(?://.*\\)?$"))
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(if (looking-at "[[:space:]]")
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(progn
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(forward-word 1)
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(backward-word 1))
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(backward-char))
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(current-column)))))
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(if (not alignment)
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(save-excursion
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(forward-char)
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(forward-line)
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(back-to-indentation)
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(current-column))
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alignment)))
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;;; Start of a reason binding
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(defvar reason-binding
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(regexp-opt '("let" "type" "module" "fun")))
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(defun reason-beginning-of-defun (&optional arg)
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"Move backward to the beginning of the current defun.
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With ARG, move backward multiple defuns. Negative ARG means
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move forward.
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This is written mainly to be used as `beginning-of-defun-function'.
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Don't move to the beginning of the line. `beginning-of-defun',
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which calls this, does that afterwards."
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(interactive "p")
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(re-search-backward (concat "^\\(" reason-binding "\\)\\_>")
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nil 'move (or arg 1)))
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(defun reason-end-of-defun ()
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"Move forward to the next end of defun.
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With argument, do it that many times.
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Negative argument -N means move back to Nth preceding end of defun.
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Assume that this is called after ‘beginning-of-defun’. So point is
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at the beginning of the defun body.
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This is written mainly to be used as `end-of-defun-function' for Reason."
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(interactive)
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;; Find the opening brace
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(if (re-search-forward "[{]" nil t)
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(progn
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(goto-char (match-beginning 0))
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;; Go to the closing brace
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(condition-case nil
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(forward-sexp)
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(scan-error
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;; The parentheses are unbalanced; instead of being unable to fontify, just jump to the end of the buffer
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(goto-char (point-max)))))
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;; There is no opening brace, so consider the whole buffer to be one "defun"
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(goto-char (point-max))))
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(defun reason-rewind-to-beginning-of-current-level-expr ()
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"Rewind to the beginning of the expression on the current level of nesting."
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(interactive)
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(let ((current-level (reason-paren-level)))
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(back-to-indentation)
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(when (looking-at "=>")
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(reason-rewind-irrelevant)
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(back-to-indentation))
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(while (> (reason-paren-level) current-level)
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(backward-up-list)
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(back-to-indentation))))
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(defun reason-mode-indent-line ()
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"Indent current line."
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(interactive)
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(let ((indent
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(save-excursion
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(back-to-indentation)
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;; Point is now at beginning of current line
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(let* ((level (reason-paren-level))
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(baseline
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;; Our "baseline" is one level out from the indentation of the expression
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;; containing the innermost enclosing opening bracket. That
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;; way if we are within a block that has a different
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;; indentation than this mode would give it, we still indent
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;; the inside of it correctly relative to the outside.
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(if (= 0 level)
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0
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(save-excursion
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(reason-rewind-irrelevant)
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(if (save-excursion
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(reason-rewind-to-beginning-of-current-level-expr)
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(looking-at "<"))
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(progn
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(reason-rewind-to-beginning-of-current-level-expr)
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(current-column))
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(progn
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(backward-up-list)
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(reason-rewind-to-beginning-of-current-level-expr)
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(cond
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((looking-at "switch")
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(current-column))
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((looking-at "|")
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(+ (current-column) (* reason-indent-offset 2)))
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(t
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(let ((current-level (reason-paren-level)))
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(save-excursion
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(while (and (= current-level (reason-paren-level))
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(not (looking-at reason-binding)))
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(reason-rewind-irrelevant)
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(reason-rewind-to-beginning-of-current-level-expr))
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(+ (current-column) reason-indent-offset)))))))))))
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(cond
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;; A function return type is indented to the corresponding function arguments
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((looking-at "=>")
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(+ baseline reason-indent-offset))
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((reason-in-str-or-cmnt)
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(cond
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;; In the end of the block -- align with star
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((looking-at "*/") (+ baseline 1))
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;; Indent to the following shape:
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;; /* abcd
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;; * asdf
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;; */
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;;
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((looking-at "*") (+ baseline 1))
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;; Indent to the following shape:
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;; /* abcd
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;; asdf
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;; */
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;;
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(t (+ baseline (+ reason-indent-offset 1)))))
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((looking-at "</") (- baseline reason-indent-offset))
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;; A closing brace is 1 level unindented
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((looking-at "}\\|)\\|\\]")
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(save-excursion
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(reason-rewind-irrelevant)
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(let ((jsx? (reason-looking-back-str ">")))
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(backward-up-list)
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(reason-rewind-to-beginning-of-current-level-expr)
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(cond
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((looking-at "switch") baseline)
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(jsx? (current-column))
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(t (- baseline reason-indent-offset))))))
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;; Doc comments in /** style with leading * indent to line up the *s
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((and (nth 4 (syntax-ppss)) (looking-at "*"))
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(+ 1 baseline))
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;; If we're in any other token-tree / sexp, then:
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(t
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(or
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;; If we are inside a pair of braces, with something after the
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;; open brace on the same line and ending with a comma, treat
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;; it as fields and align them.
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(when (> level 0)
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(save-excursion
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(reason-rewind-irrelevant)
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(backward-up-list)
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;; Point is now at the beginning of the containing set of braces
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(reason-align-to-expr-after-brace)))
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(progn
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(back-to-indentation)
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(cond ((looking-at (regexp-opt '("and" "type")))
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baseline)
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((save-excursion
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(reason-rewind-irrelevant)
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(= (point) 1))
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baseline)
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((save-excursion
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(while (looking-at "|")
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(reason-rewind-irrelevant)
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(back-to-indentation))
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(looking-at (regexp-opt '("type"))))
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(+ baseline reason-indent-offset))
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((looking-at "|\\|/[/*]")
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baseline)
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((and (> level 0)
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(save-excursion
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(reason-rewind-irrelevant)
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(backward-up-list)
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(reason-rewind-to-beginning-of-current-level-expr)
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(looking-at "switch")))
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(+ baseline reason-indent-offset))
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((save-excursion
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(reason-rewind-irrelevant)
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(looking-back "[{;,\\[(]" (- (point) 2)))
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baseline)
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((and
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(save-excursion
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(reason-rewind-irrelevant)
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(reason-rewind-to-beginning-of-current-level-expr)
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(and (looking-at reason-binding)
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(not (progn
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(forward-sexp)
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(forward-sexp)
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(skip-chars-forward "[:space:]\n")
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(looking-at "=")))))
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(not (save-excursion
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(skip-chars-backward "[:space:]\n")
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(reason-looking-back-str "=>"))))
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(save-excursion
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(reason-rewind-irrelevant)
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(backward-sexp)
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(reason-align-to-prev-expr)))
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((save-excursion
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(reason-rewind-irrelevant)
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(looking-back "<\/.*?>" (- (point) 30)))
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baseline)
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(t
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(save-excursion
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(reason-rewind-irrelevant)
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(reason-rewind-to-beginning-of-current-level-expr)
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(if (looking-at "|")
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baseline
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(+ baseline reason-indent-offset)))))
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;; Point is now at the beginning of the current line
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))))))))
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(when indent
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;; If we're at the beginning of the line (before or at the current
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;; indentation), jump with the indentation change. Otherwise, save the
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;; excursion so that adding the indentations will leave us at the
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;; equivalent position within the line to where we were before.
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(if (<= (current-column) (current-indentation))
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(indent-line-to indent)
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(save-excursion (indent-line-to indent))))))
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(provide 'reason-indent)
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;;; reason-indent.el ends here
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