Colour a $VAR within "" but not within ''.

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4599 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

 2014-02-23  Benno Schulenberg  <bensberg@justemail.net>
 	* doc/syntax/*.nanorc - Comment and punctuation tweaks.
+	* doc/syntax/sh.nanorc - Colour $VAR within a "" string
+	but not within a '' string, and do not colour strings
+	within comments.  Fixes bug #29943.
 
 2014-02-23  Benno Schulenberg  <bensberg@justemail.net>
 	* src/text.c (do_undo, do_redo, add_undo) - Make warning

doc/syntax/sh.nanorc

@@ -9,7 +9,8 @@ color green "(\{|\}|\(|\)|\;|\]|\[|`|\\|\$|<|>|!|=|&|\|)"
 color green "-[Ldefgruwx]\>"
 color green "-(eq|ne|gt|lt|ge|le|s|n|z)\>"
 color brightblue "\<(cat|cd|chmod|chown|cp|echo|env|export|grep|install|let|ln|make|mkdir|mv|rm|sed|set|tar|touch|umask|unset)\>"
+color brightyellow ""(\\.|[^"])*""
 icolor brightred "\$\{?[0-9A-Z_!@#$*?-]+\}?"
+color brightyellow "'(\\.|[^'])*'"
 color cyan "(^|[[:space:]])#.*$"
-color brightyellow ""(\\.|[^"])*"" "'(\\.|[^'])*'"
 color ,green "[[:space:]]+$"