diff options
Diffstat (limited to 'lisp/startup.el')
| -rw-r--r-- | lisp/startup.el | 73 |
1 files changed, 55 insertions, 18 deletions
diff --git a/lisp/startup.el b/lisp/startup.el index 9caf485c1e8..971841fc0db 100644 --- a/lisp/startup.el +++ b/lisp/startup.el @@ -803,19 +803,61 @@ to prepare for opening the first frame (e.g. open a connection to an X server)." (defvar server-name) (defvar server-process) -(defun startup--setup-quote-display () - "Display ASCII approximations on user request or if curved quotes don't work." - (when (memq text-quoting-style '(nil grave straight)) - (dolist (char-repl '((?‘ . ?\`) (?’ . ?\') (?“ . ?\") (?” . ?\"))) - (let ((char (car char-repl)) - (repl (cdr char-repl))) - (when (or text-quoting-style (not (char-displayable-p char))) - (when (and (eq repl ?\`) (eq text-quoting-style 'straight)) - (setq repl ?\')) - (unless standard-display-table - (setq standard-display-table (make-display-table))) - (aset standard-display-table char - (vector (make-glyph-code repl 'shadow)))))))) +(defun startup--setup-quote-display (&optional style) + "If needed, display ASCII approximations to curved quotes. +Do this by modifying `standard-display-table'. Optional STYLE +specifies the desired quoting style, as in `text-quoting-style'. +If STYLE is nil, display appropriately for the terminal." + (let ((repls (let ((style-repls (assq style '((grave . "`'\"\"") + (straight . "''\"\""))))) + (if style-repls (cdr style-repls) (make-vector 4 nil)))) + glyph-count) + ;; REPLS is a sequence of the four replacements for "‘’“”", respectively. + ;; If STYLE is nil, infer REPLS from terminal characteristics. + (unless style + ;; On a terminal that supports glyph codes, + ;; GLYPH-COUNT[i] is the number of times that glyph code I + ;; represents either an ASCII character or one of the 4 + ;; quote characters. This assumes glyph codes are valid + ;; Elisp characters, which is a safe assumption in practice. + (when (integerp (internal-char-font nil (max-char))) + (setq glyph-count (make-char-table nil 0)) + (dotimes (i 132) + (let ((glyph (internal-char-font + nil (if (< i 128) i (aref "‘’“”" (- i 128)))))) + (when (<= 0 glyph) + (aset glyph-count glyph (1+ (aref glyph-count glyph))))))) + (dotimes (i 2) + (let ((lq (aref "‘“" i)) (rq (aref "’”" i)) + (lr (aref "`\"" i)) (rr (aref "'\"" i)) + (i2 (* i 2))) + (unless (if glyph-count + ;; On a terminal that supports glyph codes, use + ;; ASCII replacements unless both quotes are displayable. + ;; If not using ASCII replacements, highlight + ;; quotes unless they are both unique among the + ;; 128 + 4 characters of concern. + (let ((lglyph (internal-char-font nil lq)) + (rglyph (internal-char-font nil rq))) + (when (and (<= 0 lglyph) (<= 0 rglyph)) + (setq lr lq rr rq) + (and (= 1 (aref glyph-count lglyph)) + (= 1 (aref glyph-count rglyph))))) + ;; On a terminal that does not support glyph codes, use + ;; ASCII replacements unless both quotes are displayable. + (and (char-displayable-p lq) + (char-displayable-p rq))) + (aset repls i2 lr) + (aset repls (1+ i2) rr))))) + (dotimes (i 4) + (let ((char (aref "‘’“”" i)) + (repl (aref repls i))) + (if repl + (aset (or standard-display-table + (setq standard-display-table (make-display-table))) + char (vector (make-glyph-code repl 'escape-glyph))) + (when standard-display-table + (aset standard-display-table char nil))))))) (defun command-line () "A subroutine of `normal-top-level'. @@ -1239,11 +1281,6 @@ the `--debug-init' option to view a complete error backtrace." ;; unibyte (display table, terminal coding system &c). (set-language-environment current-language-environment))) - ;; Setup quote display again, if the init file sets - ;; text-quoting-style to a non-nil value. - (when (and (not noninteractive) text-quoting-style) - (startup--setup-quote-display)) - ;; Do this here in case the init file sets mail-host-address. (if (equal user-mail-address "") (setq user-mail-address (or (getenv "EMAIL") |