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master 6e25d11a: Add comment
From: |
Ikumi Keita |
Subject: |
master 6e25d11a: Add comment |
Date: |
Sun, 19 Jun 2022 02:38:10 -0400 (EDT) |
branch: master
commit 6e25d11aa6a852d0309d798dc54442dc561cd19f
Author: Jean-François B <jfbu@free.fr>
Commit: Ikumi Keita <ikumi@ikumi.que.jp>
Add comment
* preview.el.in (preview-cache-preamble): Add explanation of TeX codes
written in tempral .ini file.
Signed-off-by: Ikumi Keita <ikumi@ikumi.que.jp>
---
preview.el.in | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/preview.el.in b/preview.el.in
index cefa807e..51415301 100644
--- a/preview.el.in
+++ b/preview.el.in
@@ -3979,8 +3979,28 @@ If FORMAT-CONS is non-nil, a previous format may get
reused."
(preview-cache-preamble-off format-cons)
(setq format-cons (list format-name))
(push format-cons preview-dumped-alist))
- ;; mylatex.ltx expects a file name to follow. Bad. `.tex'
- ;; in the tools bundle is an empty file.
+ ;; mylatex.ltx expects a file name to follow. Bad.
+ ;; The file `.tex' in the tools bundle is solely emitting
+ ;; `File ignored', and `\input mylatex.ltx \relax' has the
+ ;; same effect as `\input mylatex.ltx .tex '.
+ ;; The \dump hacks accomplish, among others:
+ ;; - let TeX not ignore spaces (despite instructions to the
+ ;; contrary inserted into the format by mylatex.ltx)
+ ;; as we may need to input a `file name with spaces'.
+ ;; - work around the fact that the backslash `\' (as per
+ ;; mylatex.ltx mandate) has lost its standard TeX status
+ ;; once the format is loaded, and we could not use `\input'
+ ;; as in e.g. `pdflatex &abc '\input' abc.tex'. We
+ ;; configure TeX for `/' as substitute.
+ ;; - in place of such `/input', we will use `/AUCTEXINPUT'
+ ;; defined here in the dumped format to grab the file name,
+ ;; sanitize it via `\detokenize', then
+ ;; reset TeX to ignore spaces and execute `\input' which
+ ;; will skip the preamble already dumped.
+ ;; Prior to the patch adding `/AUCTEXINPUT', resetting the
+ ;; spaces to be ignored was included as part of `\everyjob',
+ ;; which was another way to delay this to after the filename
+ ;; was seen by TeX.
(write-region "\\let\\PREVIEWdump\\dump\\def\\dump{%
\\edef\\next{{\\ifx\\pdfoutput\\undefined\\else\
\\pdfoutput=\\the\\pdfoutput\\relax\\fi\
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