let
s1 = ''
This is an indented multi-line string
literal. An amount of whitespace at
the start of each line matching the minimum
indentation of all lines in the string
literal together will be removed. Thus,
in this case four spaces will be
stripped from each line, even though
THIS LINE is indented six spaces.
Also, empty lines don't count in the
determination of the indentation level (the
previous empty line has indentation 0, but
it doesn't matter).
'';
s2 = '' If the string starts with whitespace
followed by a newline, it's stripped, but
that's not the case here. Two spaces are
stripped because of the " " at the start.
'';
s3 = ''
This line is indented
a bit further.
''; # indentation of last line doesn't count if it's empty
s4 = ''
Anti-quotations, like ${if true then "so" else "not so"}, are
also allowed.
'';
s5 = ''
The \ is not special here.
' can be followed by any character except another ', e.g. 'x'.
Likewise for $, e.g. $$ or $varName.
But ' followed by ' is special, as is $ followed by {.
If you want them, use anti-quotations: ${"''"}, ${"\${"}.
'';
s6 = ''
Tabs are not interpreted as whitespace (since we can't guess
what tab settings are intended), so don't use them.
This line starts with a space and a tab, so only one
space will be stripped from each line.
'';
s7 = ''
Also note that if the last line (just before the closing ' ')
consists only of whitespace, it's ignored. But here there is
some non-whitespace stuff, so the line isn't removed. '';
s8 = '' ${""}
This shows a hacky way to preserve an empty line after the start.
But there's no reason to do so: you could just repeat the empty
line.
'';
s9 = ''
${""} Similarly you can force an indentation level,
in this case to 2 spaces. This works because the anti-quote
is significant (not whitespace).
'';
s10 = ''
'';
s11 = '''';
s12 = '' '';
s13 = ''
start on network-interfaces
start script
rm -f /var/run/opengl-driver
${if true
then "ln -sf 123 /var/run/opengl-driver"
else if true
then "ln -sf 456 /var/run/opengl-driver"
else ""
}
rm -f /var/log/slim.log
end script
env SLIM_CFGFILE=${"abc"}
env SLIM_THEMESDIR=${"def"}
env FONTCONFIG_FILE=/etc/fonts/fonts.conf # !!! cleanup
env XKB_BINDIR=${"foo"}/bin # Needed for the Xkb extension.
env LD_LIBRARY_PATH=${"libX11"}/lib:${"libXext"}/lib:/usr/lib/ # related to xorg-sys-opengl - needed to load libglx for (AI)GLX support (for compiz)
${if true
then "env XORG_DRI_DRIVER_PATH=${"nvidiaDrivers"}/X11R6/lib/modules/drivers/"
else if true
then "env XORG_DRI_DRIVER_PATH=${"mesa"}/lib/modules/dri"
else ""
}
exec ${"slim"}/bin/slim
'';
s14 = ''
Escaping of ' followed by ': '''
Escaping of $ followed by {: ''${
And finally to interpret \n etc. as in a string: ''\n, ''\r, ''\t.
'';
# Regression test: antiquotation in '${x}' should work, but didn't.
s15 = let x = "bla"; in ''
foo
'${x}'
bar
'';
# Regression test: accept $'.
s16 = ''
cut -d $'\t' -f 1
'';
# Accept dollars at end of strings
s17 = ''ending dollar $'' + ''$'' + "\n";
in s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10 + s11 + s12 + s13 + s14 + s15 + s16 + s17
