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add multi-line comment highlighting

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between font-lock-keywords, the elisp manual, examples in the emacs
source (sh-mode is one) and the webernets, it is rather difficult to
find a way to properly deal with multi-line construct syntax
highlighting.  this is a way leveraging anchored matching and
jit-lock.
This commit is contained in:
Mark Oteiza 2017-09-07 22:03:17 -04:00
parent 3ff4f0f706
commit b0c1d64d62
1 changed files with 22 additions and 2 deletions
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24
systemd.el
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@ -24,7 +24,7 @@
;; Major mode for editing systemd units.
;; Similar to `conf-mode' but with added highlighting; e.g. for
;; Similar to `conf-mode' but with enhanced highlighting; e.g. for
;; specifiers and booleans. Employs strict regex for whitespace.
;; Features a facility for browsing documentation: use C-c C-o to open
;; links to documentation in a unit (cf. systemctl help).
@ -258,8 +258,27 @@ See `font-lock-keywords' and (info \"(elisp) Search-based Fontification\")."
(`candidates (all-completions arg (systemd-completion-table nil)))
(`post-completion (if (not (systemd-buffer-section-p)) (insert "=")))))
(defun systemd-construct-start-p ()
"Return non-nil if the current line is the first in a multi-line construct."
(let ((flag t))
(save-excursion
(while (and (zerop (forward-line -1))
(eq ?\\ (char-before (line-end-position)))
(skip-chars-forward " \t")
(setq flag (memq (following-char) '(?# ?\;))))))
flag))
(defun systemd-comment-matcher (limit)
"Matcher for comments.
Only matches comments on lines passing `systemd-construct-start-p'."
(let ((re "^[ \t]*?\\([#;]\\)\\(.*\\)$")
match)
(while (and (setq match (re-search-forward re limit t))
(not (systemd-construct-start-p))))
match))
(defconst systemd-font-lock-keywords-1
`(("^[[:space:]]*?\\([#;]\\)\\(.*\\)$"
`((systemd-comment-matcher
(1 'font-lock-comment-delimiter-face)
(2 'font-lock-comment-face))
;; sections
@ -354,6 +373,7 @@ Key bindings:
(conf-mode-initialize systemd-comment-start)
(add-hook 'company-backends #'systemd-company-backend)
(add-hook 'completion-at-point-functions #'systemd-complete-at-point nil t)
(setq-local jit-lock-contextually t)
(setq font-lock-defaults
'((systemd-font-lock-keywords
systemd-font-lock-keywords-1