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* bug#28311: 25.2; Improve syntax highlighting in bat-mode
@ 2017-08-31 19:06 Anders Lindgren
  2017-08-31 19:27 ` Achim Gratz
  0 siblings, 1 reply; 12+ messages in thread
From: Anders Lindgren @ 2017-08-31 19:06 UTC (permalink / raw)
  To: 28311

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Hi!

I've noticed some problems with syntax highlighting in bat-mode. In
addition, I have two improvement suggestions.

Problem 1:

bat-mode highlights variables surrounded by "%":s, as in "%alpha%".
However, when the variable contains an underscore, as in "%alpha_beta%",
only "alpha" is highlighted.

Problem 2:

Similarly, bat-mode highlights variables defined using "set". As with
problem 1 above, it does not handle words with underscore. Concretely, in
"set alpha_beta=value", only "alpha" is highlighted.

Problem 3:

bat-mode highlights keywords like "in". Unfortunately, it also highlights
the word "in" when used as a file extension. For example "xxx alpha.in".

Improvement suggestion 1:

In bat scripts, the command "echo" can be used to print strings to the
console. Unlike in shell scripts, the argument to "echo" does not require
quotes. It would be nice if Emacs would highlight anything after "echo" as
a string (using font-lock-string-face).

Improvement suggestion 2:

In bat scripts, variable substitution is performed inside quoted strings,
for example:

    xxx "hello %alpha goodbye"

Unfortunately, emacs does not highlight this, which I hereby propose that
it should.


I had plans to fix all of the above myself. Unfortunately, my Emacs
todo-list is too long for my available time, so Richard S. suggested that I
report this here, in case someone else would have more time than I do.

Anyway, problem 1 and 2 can probably be fixed by adapting a regexp. Problem
3 should easily be fixed by using a custom font-lock syntax table, where
"." is seen as a word character, or possibly a symbol character.
Improvement suggestion 1 could probably be handled by a simple rule
matching echo + space + whatever and highlight "whatever" using
font-lock-string-face. All of these are easy to fix.

Improvement suggestion 2 raises the bar to "medium", as it would require
replacing the current rexexp rule with one written in elisp. The rule will
need to use the "prepend" (not "t") override flag to add
font-lock-variable-name-face to the variable name in top of the string
face. However, the code must ensure that it does not do this for comments.

Side note: Typically, the "prepend" override flag is preferred over "t", as
the end result will mix face properties from both the new and old faces.
Concretely, I use a string face with a red foreground and a grey
background. With the "prepend" flag, the variable name will be drawn using
yellow from font-lock-variable-name-face but the background will still be
grey, matching the rest of the string.

    -- Anders Lindgren



In GNU Emacs 25.2.1 (x86_64-apple-darwin13.4.0, NS appkit-1265.21 Version
10.9.5 (Build 13F1911))
 of 2017-04-21 built on builder10-9.porkrind.org
Windowing system distributor 'Apple', version 10.3.1504
Configured using:
 'configure --with-ns '--enable-locallisppath=/Library/Application
 Support/Emacs/${version}/site-lisp:/Library/Application
 Support/Emacs/site-lisp' --with-modules'

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES

Important settings:
  value of $LC_CTYPE: UTF-8
  value of $LANG: en_SE.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Bat

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
next-line: End of buffer

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec password-cache epg epg-config gnus-util mm-decode mm-bodies
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rfc2047 rfc2045 ietf-drums mm-util help-fns help-mode cl-loaddefs pcase
cl-lib mail-prsvr mail-utils vc-dispatcher vc-svn bat-mode easymenu
time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel ns-win ucs-normalize term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame
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tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
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cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote kqueue cocoa ns
multi-tty make-network-process emacs)

Memory information:
((conses 16 196862 6811)
 (symbols 48 19646 0)
 (miscs 40 53 163)
 (strings 32 15415 5200)
 (string-bytes 1 442636)
 (vectors 16 33051)
 (vector-slots 8 651956 5657)
 (floats 8 162 94)
 (intervals 56 216 0)
 (buffers 976 19))

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^ permalink raw reply	[flat|nested] 12+ messages in thread
end of thread, other threads:[~2022-04-24 13:24 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-08-31 19:06 bug#28311: 25.2; Improve syntax highlighting in bat-mode Anders Lindgren
2017-08-31 19:27 ` Achim Gratz
2017-09-22 13:43   ` Eli Zaretskii
2017-09-22 17:01     ` bug#18405: " Glenn Morris
2017-09-22 17:42       ` Eli Zaretskii
2017-09-22 19:04       ` Anders Lindgren
2017-09-22 19:14         ` Eli Zaretskii
2017-09-23 12:50           ` Anders Lindgren
2017-09-23 13:09             ` Eli Zaretskii
2017-09-23 18:05               ` bug#18405: " Anders Lindgren
2017-09-23 18:17                 ` Eli Zaretskii
2022-04-24 13:24                   ` bug#18405: 24.3.93; bat-mode.el Lars Ingebrigtsen

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