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emacs.d/elpa/polymode-20191208.1239/polymode-methods.el

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2019-11-30 08:46:49 +01:00
;;; polymode-methods.el --- Methods for polymode classes -*- lexical-binding: t -*-
;;
;; Copyright (C) 2013-2019, Vitalie Spinu
;; Author: Vitalie Spinu
;; URL: https://github.com/vspinu/polymode
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; This file is *NOT* part of GNU Emacs.
;;
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 3, or
;; (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:
;;
;;; Code:
(require 'polymode-core)
;;; INITIALIZATION
(cl-defgeneric pm-initialize (object)
"Initialize current buffer with OBJECT.")
(cl-defmethod pm-initialize ((config pm-polymode))
"Initialization of host buffers.
Ran by the polymode mode function."
;; Not calling config's '-minor-mode in hosts because this pm-initialize is
;; called from minor-mode itself.
(let* ((hostmode-name (eieio-oref config 'hostmode))
(hostmode (if hostmode-name
(clone (symbol-value hostmode-name))
(pm-host-chunkmode :name "ANY" :mode nil))))
(let ((pm-initialization-in-progress t)
;; Set if nil! This allows unspecified host chunkmodes to be used in
;; minor modes.
(host-mode (or (eieio-oref hostmode 'mode)
(oset hostmode :mode major-mode))))
;; host-mode hooks are run here, but polymode is not initialized
(pm--mode-setup host-mode)
(oset hostmode -buffer (current-buffer))
(oset config -hostmode hostmode)
(setq pm--core-buffer-name (buffer-name)
pm/polymode config
pm/chunkmode hostmode
pm/current t
pm/type nil)
(pm--common-setup)
;; Initialize innermodes
(pm--initialize-innermodes config)
;; FIXME: must go into polymode-compat.el
(add-hook 'flyspell-incorrect-hook
'pm--flyspel-dont-highlight-in-chunkmodes nil t))
(pm--run-init-hooks hostmode 'host 'polymode-init-host-hook)))
(defun pm--initialize-innermodes (config)
(let ((inner-syms (delete-dups
(delq :inherit
(apply #'append
(pm--collect-parent-slots
config 'innermodes
(lambda (obj)
(memq :inherit
(eieio-oref obj 'innermodes)))))))))
(oset config -innermodes
(mapcar (lambda (sub-name)
(clone (symbol-value sub-name)))
inner-syms))))
(cl-defmethod pm-initialize ((chunkmode pm-inner-chunkmode) &optional type mode)
"Initialization of the innermodes' (indirect) buffers."
;; run in chunkmode indirect buffer
(setq mode (or mode (pm--get-innermode-mode chunkmode type)))
(let* ((pm-initialization-in-progress t)
(post-fix (replace-regexp-in-string "poly-\\|-mode" "" (symbol-name mode)))
(core-name (format "%s[%s]" (buffer-name (pm-base-buffer))
(or (cdr (assoc post-fix polymode-mode-abbrev-aliases))
post-fix)))
(new-name (generate-new-buffer-name core-name)))
(rename-buffer new-name)
(pm--mode-setup mode)
(pm--move-vars '(pm/polymode buffer-file-coding-system) (pm-base-buffer))
;; fixme: This breaks if different chunkmodes use same-mode buffer. Even for
;; head/tail the value of pm/type will be wrong for tail
(setq pm--core-buffer-name core-name
pm/chunkmode chunkmode
pm/type (pm-true-span-type chunkmode type))
;; Call polymode mode for the sake of the keymap. Same minor mode which runs
;; in the host buffer but without all the heavy initialization.
(funcall (eieio-oref pm/polymode '-minor-mode))
;; FIXME: should not be here?
(vc-refresh-state)
(pm--common-setup)
(add-hook 'syntax-propertize-extend-region-functions
#'polymode-syntax-propertize-extend-region-in-host
-90 t)
(pm--move-vars polymode-move-these-vars-from-base-buffer (pm-base-buffer))
;; If this rename happens before the mode setup font-lock doesn't work in
;; inner buffers.
(when pm-hide-implementation-buffers
(rename-buffer (generate-new-buffer-name (concat " " pm--core-buffer-name)))))
(pm--run-init-hooks chunkmode type 'polymode-init-inner-hook))
(defvar poly-lock-allow-fontification)
(defun pm--mode-setup (mode &optional buffer)
;; General major-mode install. Should work for both indirect and base buffers.
;; PM objects are not yet initialized (pm/polymode, pm/chunkmode, pm/type)
(with-current-buffer (or buffer (current-buffer))
;; don't re-install if already there; polymodes can be used as minor modes.
(unless (eq major-mode mode)
(let ((polymode-mode t) ;major-modes might check this
(base (buffer-base-buffer))
;; Some modes (or minor-modes which are run in their hooks) call
;; font-lock functions directly on the entire buffer (#212 for an
;; example). They were inhibited here before, but these variables
;; are designed to be set by modes, so our setup doesn't have an
;; effect in those cases and we get "Making xyz buffer-local while
;; locally let-bound!" warning which seems to be harmless but
;; annoying. The only solution seems to be to advice those
;; functions, particularly `font-lock-fontify-region`.
;; (font-lock-flush-function 'ignore)
;; (font-lock-ensure-function 'ignore)
;; (font-lock-fontify-buffer-function 'ignore)
;; (font-lock-fontify-region-function 'ignore)
(font-lock-function 'ignore)
;; Mode functions can do arbitrary things. We inhibt all PM hooks
;; because PM objects have not been setup yet.
(pm-allow-after-change-hook nil)
(poly-lock-allow-fontification nil))
;; run-mode-hooks needs buffer-file-name, so we transfer base vars twice
(when base
(pm--move-vars polymode-move-these-vars-from-base-buffer base))
(condition-case-unless-debug err
;; !! run-mode-hooks and hack-local-variables run here
(funcall mode)
(error (message "Polymode error (pm--mode-setup '%s): %s"
mode (error-message-string err))))
;; In emacs 27 this is called from run-mode-hooks
(and (bound-and-true-p syntax-propertize-function)
(not (local-variable-p 'parse-sexp-lookup-properties))
(setq-local parse-sexp-lookup-properties t))))
(setq polymode-mode t)
(current-buffer)))
(defvar syntax-ppss-wide)
(defun pm--common-setup (&optional buffer)
"Run common setup in BUFFER.
Runs after major mode and core polymode structures have been
initialized. Return the buffer."
(with-current-buffer (or buffer (current-buffer))
(object-add-to-list pm/polymode '-buffers (current-buffer))
;; INDENTATION
(setq-local pm--indent-line-function-original
(if (memq indent-line-function '(indent-relative indent-relative-maybe))
#'pm--indent-line-basic
indent-line-function))
(setq-local indent-line-function #'pm-indent-line-dispatcher)
(setq-local pm--indent-region-function-original
(if (memq indent-region-function '(nil indent-region-line-by-line))
#'pm--indent-region-line-by-line
indent-region-function))
(setq-local indent-region-function #'pm-indent-region)
;; FILL
(setq-local pm--fill-forward-paragraph-original fill-forward-paragraph-function)
(setq-local fill-forward-paragraph-function #'polymode-fill-forward-paragraph)
;; HOOKS
(add-hook 'kill-buffer-hook #'polymode-after-kill-fixes nil t)
(add-hook 'post-command-hook #'polymode-post-command-select-buffer nil t)
(add-hook 'pre-command-hook #'polymode-pre-command-synchronize-state nil t)
;; FONT LOCK (see poly-lock.el)
(setq-local font-lock-function 'poly-lock-mode)
;; Font lock is a globalized minor mode and is thus initialized in
;; `after-change-major-mode-hook' within `run-mode-hooks'. As a result
;; poly-lock won't get installed if polymode is installed as a minor mode or
;; interactively. We add font/poly-lock in all buffers (because this is how
;; inner buffers are installed) but use `poly-lock-allow-fontification' to
;; disallow fontification in buffers which don't want font-lock (aka those
;; buffers where `turn-on-font-lock-if-desired' doesn't activate font-lock).
(turn-on-font-lock-if-desired) ; <- need this for the sake of poly-minor-modes
;; FIXME: can poly-lock-mode be used here instead?
(setq-local poly-lock-allow-fontification font-lock-mode)
;; Make sure to re-install with our font-lock-function as
;; `turn-on-font-lock-if-desired' from above might actually not call it.
(font-lock-mode t)
(font-lock-flush)
;; SYNTAX (must be done after font-lock for after-change order)
(with-no-warnings
;; [OBSOLETE as of 25.1 but we still protect it]
(pm-around-advice syntax-begin-function 'pm-override-output-position))
;; (advice-remove 'c-beginning-of-syntax #'pm-override-output-position)
;; Ideally this should be called in some hook to avoid minor-modes messing
;; it up. Setting even if syntax-propertize-function is nil to have more
;; control over syntax-propertize--done.
(unless (eq syntax-propertize-function #'polymode-syntax-propertize)
(setq-local pm--syntax-propertize-function-original syntax-propertize-function)
(setq-local syntax-propertize-function #'polymode-syntax-propertize))
(setq-local syntax-ppss-wide (cons nil nil))
;; Flush ppss in all buffers. Must be done in first after-change (see
;; https://lists.gnu.org/archive/html/emacs-devel/2019-03/msg00500.html)
;; TODO: Consider just advising syntax-ppss-flush-cache once the above is
;; fixed in emacs.
(add-hook 'after-change-functions 'polymode-flush-syntax-ppss-cache nil t)
(current-buffer)))
;;; BUFFER CREATION
(cl-defgeneric pm-get-buffer-create (chunkmode &optional type)
"Get the indirect buffer associated with SUBMODE and SPAN-TYPE.
Create and initialize the buffer if does not exist yet.")
(cl-defmethod pm-get-buffer-create ((chunkmode pm-host-chunkmode) &optional type)
(when type
(error "Cannot create host buffer of type '%s'" type))
(let ((buff (eieio-oref chunkmode '-buffer)))
(if (buffer-live-p buff)
buff
(error "Cannot create host buffer for host chunkmode %s" (eieio-object-name chunkmode)))))
(cl-defmethod pm-get-buffer-create ((chunkmode pm-inner-chunkmode) &optional type)
(let ((buff (cl-case type
(body (eieio-oref chunkmode '-buffer))
(head (eieio-oref chunkmode '-head-buffer))
(tail (eieio-oref chunkmode '-tail-buffer))
(t (error "Don't know how to select buffer of type '%s' for chunkmode '%s'"
type (eieio-object-name chunkmode))))))
(if (buffer-live-p buff)
buff
(let ((new-buff (pm--get-innermode-buffer-create chunkmode type)))
(pm--set-innermode-buffer chunkmode type new-buff)))))
(defun pm--get-innermode-buffer-create (chunkmode type &optional force-new)
(let ((mode (pm--get-innermode-mode chunkmode type)))
(or
;; 1. search through the existing buffer list
(unless force-new
(cl-loop for bf in (eieio-oref pm/polymode '-buffers)
when (let ((out (and (buffer-live-p bf)
(eq mode (buffer-local-value 'major-mode bf)))))
out)
return bf))
;; 2. create new
(with-current-buffer (pm-base-buffer)
(let* ((new-name (generate-new-buffer-name (buffer-name)))
(new-buffer (make-indirect-buffer (current-buffer) new-name)))
(with-current-buffer new-buffer
(pm-initialize chunkmode type mode))
new-buffer)))))
(defun pm-get-buffer-of-mode (mode)
(let ((mode (pm--true-mode-symbol mode)))
(or
;; 1. search through the existing buffer list
(cl-loop for bf in (eieio-oref pm/polymode '-buffers)
when (and (buffer-live-p bf)
(eq mode (buffer-local-value 'major-mode bf)))
return bf)
;; 2. create new if body mode matched
(cl-loop for imode in (eieio-oref pm/polymode '-innermodes)
when (eq mode (eieio-oref imode 'mode))
return (pm--get-innermode-buffer-create imode 'body 'force)))))
(defun pm--set-innermode-buffer (obj type buff)
"Assign BUFF to OBJ's slot(s) corresponding to TYPE."
(with-slots (-buffer head-mode -head-buffer tail-mode -tail-buffer) obj
(pcase (list type head-mode tail-mode)
(`(body body ,(or `nil `body))
(setq -buffer buff
-head-buffer buff
-tail-buffer buff))
(`(body ,_ body)
(setq -buffer buff
-tail-buffer buff))
(`(body ,_ ,_ )
(setq -buffer buff))
(`(head ,_ ,(or `nil `head))
(setq -head-buffer buff
-tail-buffer buff))
(`(head ,_ ,_)
(setq -head-buffer buff))
(`(tail ,_ ,(or `nil `head))
(setq -tail-buffer buff
-head-buffer buff))
(`(tail ,_ ,_)
(setq -tail-buffer buff))
(_ (error "Type must be one of 'body, 'head or 'tail")))))
;;; SPAN MANIPULATION
(cl-defgeneric pm-get-span (chunkmode &optional pos)
"Ask the CHUNKMODE for the span at point.
Return a list of three elements (TYPE BEG END OBJECT) where TYPE
is a symbol representing the type of the span surrounding
POS (head, tail, body). BEG and END are the coordinates of the
span. OBJECT is a suitable object which is 'responsible' for this
span. This is an object that could be dispatched upon with
`pm-select-buffer'. Should return nil if there is no SUBMODE
specific span around POS. Not to be used in programs directly;
use `pm-innermost-span'.")
(cl-defmethod pm-get-span (chunkmode &optional _pos)
"Return nil.
Host modes usually do not compute spans."
(unless chunkmode
(error "Dispatching `pm-get-span' on a nil object"))
nil)
(cl-defmethod pm-get-span ((chunkmode pm-inner-chunkmode) &optional pos)
"Return a list of the form (TYPE POS-START POS-END SELF).
TYPE can be 'body, 'head or 'tail. SELF is the CHUNKMODE."
(with-slots (head-matcher tail-matcher head-mode tail-mode) chunkmode
(let ((span (pm--span-at-point head-matcher tail-matcher pos
(eieio-oref chunkmode 'can-overlap))))
(when span
(append span (list chunkmode))))))
(cl-defmethod pm-get-span ((_chunkmode pm-inner-auto-chunkmode) &optional _pos)
(let ((span (cl-call-next-method)))
(if (null (car span))
span
(setf (nth 3 span) (apply #'pm--get-auto-chunkmode span))
span)))
;; (defun pm-get-chunk (ichunkmode &optional pos)
;; (with-slots (head-matcher tail-matcher head-mode tail-mode) ichunkmode
;; (pm--span-at-point
;; head-matcher tail-matcher (or pos (point))
;; (eieio-oref ichunkmode 'can-overlap)
;; t)))
(cl-defgeneric pm-next-chunk (chunkmode &optional pos)
"Ask the CHUNKMODE for the chunk after POS.
Return a list of three elements (CHUNKMODE HEAD-BEG HEAD-END
TAIL-BEG TAIL-END).")
(cl-defmethod pm-next-chunk (chunkmode &optional _pos)
nil)
(cl-defmethod pm-next-chunk ((chunkmode pm-inner-chunkmode) &optional pos)
(with-slots (head-matcher tail-matcher head-mode tail-mode) chunkmode
(let ((raw-chunk (pm--next-chunk
head-matcher tail-matcher (or pos (point))
(eieio-oref chunkmode 'can-overlap))))
(when raw-chunk
(cons chunkmode raw-chunk)))))
(cl-defmethod pm-next-chunk ((chunkmode pm-inner-auto-chunkmode) &optional pos)
(with-slots (head-matcher tail-matcher head-mode tail-mode) chunkmode
(let ((raw-chunk (pm--next-chunk
head-matcher tail-matcher (or pos (point))
(eieio-oref chunkmode 'can-overlap))))
(when raw-chunk
(cons (pm--get-auto-chunkmode 'head (car raw-chunk) (cadr raw-chunk) chunkmode)
raw-chunk)))))
;; FIXME: cache somehow?
(defun pm--get-auto-chunkmode (type beg end proto)
(save-excursion
(goto-char beg)
(unless (eq type 'head)
(goto-char end) ; fixme: add multiline matchers to micro-optimize this
(let ((matcher (pm-fun-matcher (eieio-oref proto 'head-matcher))))
;; can be multiple incomplete spans within a span
(while (< beg (goto-char (car (funcall matcher -1)))))))
(let* ((str (let ((matcher (eieio-oref proto 'mode-matcher)))
(when (stringp matcher)
(setq matcher (cons matcher 0)))
(cond ((consp matcher)
(re-search-forward (car matcher) (point-at-eol) t)
(match-string-no-properties (cdr matcher)))
((functionp matcher)
(funcall matcher)))))
(mode (pm-get-mode-symbol-from-name str (eieio-oref proto 'fallback-mode))))
(if (eq mode 'host)
(oref pm/polymode -hostmode)
;; chunkname:MODE serves as ID (e.g. `markdown-fenced-code:emacs-lisp-mode`).
;; Head/tail/body indirect buffers are shared across chunkmodes and span
;; types.
(let ((automodes (eieio-oref pm/polymode '-auto-innermodes)))
(if (memq proto automodes)
;; a. if proto already part of the list return
proto
(let ((name (concat (pm-object-name proto) ":" (symbol-name mode))))
(or
;; b. loop through installed inner modes
(cl-loop for obj in automodes
when (equal name (pm-object-name obj))
return obj)
;; c. create new
(let ((innermode (clone proto :name name :mode mode)))
(object-add-to-list pm/polymode '-auto-innermodes innermode)
innermode)))))))))
;;; INDENT
;; indent-region-line-by-line for polymode buffers (more efficient, works on
;; emacs 25, but no progress reporter)
(defun pm--indent-region-line-by-line (start end)
(save-excursion
;; called from pm--indent-raw; so we know we are in the same span with
;; buffer set and narrowed to span if 'protect-indent is non-nil
(let ((span (pm-innermost-span start)))
(setq end (copy-marker end))
(goto-char start)
(while (< (point) end)
(unless (and (bolp) (eolp))
;; fixme: html-erb jumps line here; need save-excursion. why?
(save-excursion (pm-indent-line (nth 3 span) span)))
(forward-line 1))
(move-marker end nil))))
(defun pm--indent-line-basic ()
"Used as `indent-line-function' for modes with tab indent."
;; adapted from indent-according-to-mode
(let ((column (save-excursion
(beginning-of-line)
(if (bobp) 0
(beginning-of-line 0)
(if (looking-at "[ \t]*$") 0 (current-indentation))))))
(if (<= (current-column) (current-indentation))
(indent-line-to column)
(save-excursion (indent-line-to column)))))
(defun pm--indent-raw (span fn-sym &rest args)
;; fixme: do save-excursion instead of this?
(let ((point (point)))
;; do fast synchronization here
(save-current-buffer
(pm-set-buffer span)
(goto-char point)
(let ((fn (symbol-value fn-sym)))
(when fn
(if (eieio-oref (nth 3 span) 'protect-indent)
(pm-with-narrowed-to-span span
(apply fn args))
(apply fn args))))
(setq point (point)))
(goto-char point)))
(defun pm--indent-line-raw (span)
(pm--indent-raw span 'pm--indent-line-function-original)
(pm--reindent-with+-indent span (point-at-bol) (point-at-eol)))
(defun pm--indent-region-raw (span beg end)
(pm--indent-raw span 'pm--indent-region-function-original beg end)
(pm--reindent-with+-indent span beg end))
(defun pm-indent-region (beg end)
"Indent region between BEG and END in polymode buffers.
Function used for `indent-region-function'."
;; (message "(pm-indent-region %d %d)" beg end)
;; cannot use pm-map-over-spans here because of the buffer modifications
(let ((inhibit-point-motion-hooks t)
(end (copy-marker end)))
(save-excursion
(while (< beg end)
(goto-char beg)
(back-to-indentation)
(setq beg (point))
(let ((span (pm-innermost-span beg 'no-cache)))
(let* ((end-span (copy-marker (nth 2 span)))
(end1 (min end end-span)))
(goto-char beg)
;; (pm-switch-to-buffer)
;; indent first line separately
(pm-indent-line (nth 3 span) span)
(beginning-of-line 2)
(when (< (point) end1)
;; we know that span end was moved, hard reset without recomputation
(setf (nth 2 span) end-span)
(pm--indent-region-raw span (point) end1))
(setq beg (max end1 (point)))))))
(move-marker end nil)))
(defun pm-indent-line-dispatcher (&optional span)
"Dispatch `pm-indent-line' methods on current SPAN.
Value of `indent-line-function' in polymode buffers."
;; NB: No buffer switching in indentation functions. See comment at
;; pm-switch-to-buffer.
(let ((span (or span (pm-innermost-span
(save-excursion (back-to-indentation) (point)))))
(inhibit-read-only t))
(pm-indent-line (nth 3 span) span)))
(cl-defgeneric pm-indent-line (chunkmode &optional span)
"Indent current line.
Protect and call original indentation function associated with
the chunkmode.")
(cl-defmethod pm-indent-line ((_chunkmode pm-chunkmode) span)
(let ((pos (point))
(delta))
(back-to-indentation)
(setq delta (- pos (point)))
(let* ((bol (point-at-bol))
(span (or span (pm-innermost-span)))
(prev-span-pos)
(first-line (save-excursion
(goto-char (nth 1 span))
(unless (bobp)
(setq prev-span-pos (1- (point))))
(forward-line)
(<= bol (point)))))
(pm--indent-line-raw span)
(when (and first-line prev-span-pos)
(pm--reindent-with-extra-offset (pm-innermost-span prev-span-pos)
'post-indent-offset)))
(when (and delta (> delta 0))
(goto-char (+ (point) delta)))))
(cl-defmethod pm-indent-line ((_chunkmode pm-inner-chunkmode) span)
"Indent line in inner chunkmodes.
When point is at the beginning of head or tail, use parent chunk
to indent."
(let ((pos (point))
(delta))
(back-to-indentation)
(setq delta (- pos (point)))
(unwind-protect
(cond
;; 1. HEAD or TAIL (we assume head or tail fits in one line for now)
((or (eq 'head (car span))
(eq 'tail (car span)))
(goto-char (nth 1 span))
(when (not (bobp))
;; ind-point need not be in prev-span; there might be other spans in between
(let ((prev-span (pm-innermost-span (1- (point)))))
(if (eq 'tail (car span))
(indent-line-to (pm--head-indent prev-span))
;; head indent and adjustments
;; (pm-indent-line (nth 3 prev-span) prev-span)
(pm--indent-line-raw prev-span)
(let ((prev-tail-pos (save-excursion
(beginning-of-line)
(skip-chars-backward " \t\n")
(if (bobp) (point) (1- (point))))))
(setq prev-span (pm-innermost-span prev-tail-pos)))
(pm--reindent-with-extra-offset prev-span 'post-indent-offset)
(pm--reindent-with-extra-offset span 'pre-indent-offset)))))
;; 2. BODY
(t
(if (< (point) (nth 1 span))
;; first body line in the same line with header (re-indent at indentation)
(pm-indent-line-dispatcher)
(let ((fl-indent (pm--first-line-indent span)))
(if fl-indent
;; We are not on the 1st line
(progn
;; thus indent according to mode
(pm--indent-line-raw span)
(when (bolp)
;; When original mode's indented to bol, match with the
;; first line indent. Otherwise it's a continuation
;; indentation and we assume the original function did it
;; correctly with respect to previous lines.
(indent-to fl-indent)))
;; On the first line. Indent with respect to header line.
(let ((delta (save-excursion
(goto-char (nth 1 span))
(+
(pm--oref-value (nth 3 span) 'body-indent-offset)
(cond
;; empty line
((looking-at-p "[ \t]*$") 0)
;; inner span starts at bol; honor +-indent cookie
((= (point) (point-at-bol))
(pm--+-indent-offset-on-this-line span))
;; code after header
(t
(end-of-line)
(skip-chars-forward "\t\n")
(pm--indent-line-raw span)
(- (point) (point-at-bol))))))))
(indent-line-to
;; indent with respect to header line
(+ delta (pm--head-indent span)))))))))
;; keep point on same characters
(when (and delta (> delta 0))
(goto-char (+ (point) delta))))))
(defun pm--first-line-indent (&optional span)
(save-excursion
(let ((pos (point)))
(goto-char (nth 1 (or span (pm-innermost-span))))
;; when body starts at bol move to previous line
(when (and (= (point) (point-at-bol))
(not (bobp)))
(backward-char 1))
(skip-chars-forward " \t\n")
(when (< (point-at-eol) pos)
(- (point) (point-at-bol))))))
;; SPAN is a body span; do nothing if narrowed to body
(defun pm--head-indent (&optional span)
(save-restriction
(widen)
(save-excursion
(let ((sbeg (nth 1 (or span (pm-innermost-span)))))
(goto-char sbeg)
(backward-char 1)
(let ((head-span (pm-innermost-span)))
(if (eq (car head-span) 'head)
(goto-char (nth 1 head-span))
;; body span is not preceded by a head span. We don't have such
;; practical cases yet, but headless spans are real - indented blocks
;; for instance.
(goto-char sbeg)))
(back-to-indentation)
(- (point) (point-at-bol))))))
(defun pm--+-indent-offset-on-this-line (span)
(if (re-search-forward "\\([+-]\\)indent" (point-at-eol) t)
(let ((basic-offset (pm--oref-value (nth 3 span) 'indent-offset)))
(if (string= (match-string 1) "-")
(- basic-offset)
basic-offset))
0))
(defun pm--reindent-with+-indent (span beg end)
(save-excursion
(goto-char beg)
(let ((basic-offset (pm--oref-value (nth 3 span) 'indent-offset)))
(while (and (< (point) end)
(re-search-forward "\\([+-]\\)indent" end t))
(let ((offset (if (string= (match-string 1) "-")
(- basic-offset)
basic-offset)))
(indent-line-to (max 0 (+ (current-indentation) offset)))
(forward-line))))))
(defun pm--reindent-with-extra-offset (span offset-type &optional offset2)
(let ((offset (eieio-oref (nth 3 span) offset-type)))
(unless (and (numberp offset) (= offset 0))
(let ((pos (nth (if (eq offset-type 'post-indent-offset) 2 1) span)))
(save-excursion
(goto-char pos)
(setq offset (pm--object-value offset)))
(indent-line-to (max 0 (+ (current-indentation) offset (or offset2 0))))))))
;;; FACES
(cl-defgeneric pm-get-adjust-face (chunkmode type))
(cl-defmethod pm-get-adjust-face ((chunkmode pm-chunkmode) _type)
(eieio-oref chunkmode 'adjust-face))
(cl-defmethod pm-get-adjust-face ((chunkmode pm-inner-chunkmode) type)
(cond ((eq type 'head)
(eieio-oref chunkmode 'head-adjust-face))
((eq type 'tail)
(or (eieio-oref chunkmode 'tail-adjust-face)
(eieio-oref chunkmode 'head-adjust-face)))
(t (eieio-oref chunkmode 'adjust-face))))
(provide 'polymode-methods)
;;; polymode-methods.el ends here
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