From badf3edc5583525e09457e8720c9c81a169e42b5 Mon Sep 17 00:00:00 2001
From: Benno Schulenberg <bensberg@telfort.nl>
Date: Fri, 15 Oct 2021 17:24:18 +0200
Subject: [PATCH] syntax: texinfo: colorize the special @-plus-punctuation
 commands too

Also, allow an @} and another @command{} within a pair of braces,
colorize only the valid @-commands with uppercase in their names,
unbold enclosed command arguments, colorize the directory entries
for the manual, and properly colorize also the comments that use
the full @comment command.

Reference:
  https://www.gnu.org/software/texinfo/manual/texinfo/html_node/Command-List.html

Testing was done with:
  info texinfo @-C "Command List" --output=list
  sed -i -e "s/^'//" -e "s/'$//" list
  nano list -Ytexinfo
---
 syntax/texinfo.nanorc | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/syntax/texinfo.nanorc b/syntax/texinfo.nanorc
index 266b7aa6..39cb20f9 100644
--- a/syntax/texinfo.nanorc
+++ b/syntax/texinfo.nanorc
@@ -8,17 +8,24 @@ header "^\\input texinfo"
 magic "Texinfo source"
 comment "@c "
 
+# How the manual gets listed in the directory node.
+color purple start="^@direntry" end="^@end direntry"
+
 # Command arguments, trailing and enclosed.
 color cyan "^@[a-z]+[[:space:]]+.*"
-color brightmagenta "@[a-zA-Z]+\{[^}]*\}"
+color lightmagenta "@([a-z]+|,|H|U)\{([^}]|@\}|@[a-z]+\{[^}]*\})*\}"
 # Commands themselves.
-color yellow "@[a-zA-Z]+\{?|\}"
+color yellow "@([a-z]+\{?|[,HU]\{|(AA|AE|DH|L|OE?|(La)?TeX|TH)\{)|\}"
+color pink "@[!"'&*./:=?@\^`{}~-]"
+
+# Special separator for headings and footings.
+color mint "@\|"
 
 # Menu items.
 color brightred "^\*[[:space:]]+.*::.*"
 
 # Comments.
-color green "@c[[:space:]]+.*"
+color green "@c(omment)?[[:space:]]+.*"
 
 # Trailing whitespace.
 color ,green "[[:space:]]+$"