X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?p=subdirmk.git;a=blobdiff_plain;f=README;h=63e41881b9674d440978d4f1076190f2df7fef3d;hp=67ce6cc17c8fd3755ecddf39a675a073850f11ff;hb=cf7f7e9dfdb0241d091655bca63edcdae5b81c03;hpb=503a7e5169b4a18e2ad2569daeb9e13a99f21070

diff --git a/README b/README
index 67ce6cc..63e4188 100644
--- a/README
+++ b/README
@@ -247,7 +247,12 @@ So pathname syntax is a subset of:
     '&' [ '^' | '~' ] [ lc | '/' | '.' | '=' ]
 
 &&		=>	&&		for convenience in shell runes
-\&		=>	&		general escaping mechanism
+
+&\&		=>	&		general escaping mechanism
+&\$		=>	$
+
+&$VARIABLE	=>	$(sub_dir_VARIABLE)	or $(TOP_VARIABLE)
+	VARIABLE is ASCII starting with a letter and matching \w+
 
 & thing thing... &
 &^ thing thing... &
@@ -263,30 +268,31 @@ So pathname syntax is a subset of:
 	recognised at start of line only (possibly after lwsp)
 	args are processed for &
 
-&:include filename		filename should usually be foo.sd.mk
+&:include filename		filename should usually be [&]foo.sd.mk
 &:-include filename		tolerate nonexistent file
 	filenames are relative to $(top_srcdir)
+	RHS is &-expanded
 
 &!<lwsp>	disables & until EOL (and then disappears)
 
 &#	delete everything to end of line
 	(useful if the RHS contains unrecognised & constructions)
 
-&:changequote STUFF
-	changes the escape sequence from & to literally STUFF
-	STUFF may be any series of of non-whitespace characters,
+&:changequote NEWQUOTE
+	changes the escape sequence from & to literally NEWQUOTE
+	NEWQUOTE may be any series of of non-whitespace characters,
 	and is terminated by EOL or lwsp.  The whole line is
 	discarded.
 
-	After this, write STUFF instead of &, everywhere.
+	After this, write NEWQUOTE instead of &, everywhere.
 	The effect is global and lasts until the next setting.
 	It takes effect on &:include'd files too, so maybe set
 	it back before using &:include.
 
 	Notably
-		STUFFSTUFF		=> STUFFSTUFF
-		\STUFF			=> STUFF
-		STUFF:changequote &	=> set escape back to &
+		NEWQUOTENEWQUOTE	=> NEWQUOTENEWQUOTE
+		NEWQUOTE\NEWQUOTE	=> NEWQUOTE
+		NEWQUOTE:changequote &	set escape back to &
 
 &TARGETS_things
 	Handled specially.  If mentioned, declares that this