Bash highlight variables

sir-oberon · Jul 15, 2014#12014-07-15T14:50+00:00

Hi,

I'd like to highlight complete variables in bash.
The variables either look like:
$var
or like
${var}

I tried playing around with with Marker Characters but did not find the answer.

My wordfile:

Code: Select all

L33"Bash_2" Line Comment = #  Escape Char = \ String Chars = "' File Extensions = SH CSH
/Delimiters = ~!@$%^*()+=/\[]{}:;"<>'´` ,       .?
/Indent Strings = "{("
/Unindent Strings = "})"
/Function String = "%[a-zA-Z_]*("
/Function String 1 = "%[a-zA-Z_]*{"
/Marker Characters = "${}"
/C1
'
{
}
&&
||
$
alias
break
case continue
do done
elif else esac exit export
fi for
if in
return
set
then
unalias unset
while
/C2
halt
ifconfig init initlog insmod
linuxconf lsmod
modprobe
reboot rmmod route
shutdown
traceroute
/C3
]
[
awk
basename
cat cp
echo egrep
fgrep
gawk grep gzip
kill killall
less
md mkdir mv
nice
pidof ps
rd read rm rmdir
sed sleep
test touch
ulimit uname usleep
zcat zless
/C4
`
-a -b -c -d -e -f -g -h -i -j -k -l -m -n -o -p -q -r -s -t -u -v -w -x -z
/C5
-eq -ge -gt -le -lt
=
!=
/C6"Variables" Colors = 1508853
$}

Any help is appreciated.

MickRC3 · Jul 15, 2014#22014-07-15T17:12+00:00

Marker characters are defined as single character pairs with up to 4 pairs. So your example "${}" says the first pair opens with $ and ends with { while the second pair is incomplete but it would open with } if there were another character after it. If you changed your marker characters to "{}" then you could highlight those variables when the braces are used.

Also you have to define the color to be used or the default text color is used. To define the color, put the pair in the color group you want. For example, put {} in C4 on a line by itself.

As for highlighting varibles that have the $ but don't have the braces, there isn't much that can be done outside of a kludge. Like making sure that all of your variables end in z and then adding a marker characters pair of "$z"

Mofi · Jul 16, 2014#32014-07-16T13:50+00:00

I suggest following:

Code: Select all

/L20"Bash" Line Comment = # String Chars = "' Escape Char = \ DisableMLS File Extensions = SH CSH
/Delimiters = ! "	$%'()*+,./:;<=>?@[\]^`~´
/Function String = "%^([0-9a-z_]+^)[^t ]++[({]"
/Indent Strings = "(" "{"
/Unindent Strings = ")" "}"
/Open Brace Strings = "(" "{" "["
/Close Brace Strings = ")" "}" "]"
/Open Fold Strings = "if" "elif" "else" "for" "while" "until"
/Close Fold Strings = "elif" "else" "fi" "done"
/C1"Keywords"
$
alias
break
case continue
do done
elif else esac exit export
fi for
if in
return
set
then
unalias unset until
while
{
}
/C2"Commands 1"
halt
ifconfig init initlog insmod
linuxconf lsmod
modprobe
reboot rmmod route
shutdown
traceroute
/C3"Commands 2"
[
]
awk
basename
cat cp
echo egrep
fgrep
gawk grep gzip
kill killall
less
md mkdir mv
nice
pidof ps
rd read rm rmdir
sed sleep
test touch
ulimit uname usleep
zcat zless
/C4"Switches"
** -a -b -c -d -e -f -g -h -i -j -k -l -m -n -o -p -q -r -s -t -u -v -w -x -z
/C5"Operators"
!
&&
-eq -ge -gt -le -lt
<
=
>
| ||
/C6"Single Quotes"
'
`
´
/C7"Variables in Braces"
** ${
/C8"Variables no Braces"
** $

Note: There should be a tab character between between " and $ in the second line.

We would need good examples of bash scripts to improve this syntax highlighting definition.

MickRC3 · Jul 16, 2014#42014-07-16T22:14+00:00

Since the same variable rules apply for the Bourne and Korn shell scripting syntax file, I made similar changes there. I did have to remove the $ from the delimiter character list to allow highlighting for the special shell variables $0-$9, $-, $*, $#, $$ and $?

Sorry about the colors. I tweaked them for contrast for this example.

Jul 16, 2014#52014-07-16T22:40+00:00

The braces are used to separate the variable from regular characters which can immediately follow the variable. However the syntax color continues until a delimiter is encountered. I fixed that by adding the closing brace to the delimiter characters. I gave the closing brace the same color as the variable by adding it to the color group defining ${. Since the braces are used with function definitions, I also added the open brace so the colors would be the same when used that way.