macro support

Signed-off-by: fbt <fbt@fleshless.org>

sx-open.cfg

@@ -2,6 +2,12 @@
 # Configuration file for sx-open
 # Note that as sx-open checks the regexes in order, they should be placed in order from specific to less so.
 
+# <cmd> macros:
+# %target% — The first argument to this script.
+#            If not found, target is appended to the end of <cmd>
+# example:
+#uri 'browser %target% --profile=work' '^https://.+\.?workdomain.tld.*'
+
 # scheme <cmd> <scheme>[ <scheme> ...]
 #scheme browser http https
 #scheme steam steam