Syntax: Introduce &. and friends

[subdirmk.git] / README

diff --git a/README b/README
index 006b57f62eaeacb6cb0927dcfe67b3968121e15b..67ce6cc17c8fd3755ecddf39a675a073850f11ff 100644 (file)
--- a/README
+++ b/README
@@ -218,27 +218,33 @@ empty string).
        The assumption is that filenames are usually lowercase and
        variables usually uppercase.  Otherwise, use another syntax:
 
        The assumption is that filenames are usually lowercase and
        variables usually uppercase.  Otherwise, use another syntax:
 

+&/             =>      sub/dir/                        or nothing

 &_             =>      sub_dir_                        or TOP_
 &_             =>      sub_dir_                        or TOP_

-&=_            =>      sub_dir                         or TOP
+&.             =>      sub/dir                         or .
+       (This implies that `&./' works roughly like `&/', although
+       it can produce a needless `./')

 
 

-&/             =>      sub/dir/                        or nothing
-&=/            =>      sub/dir                         or .
+&=             =>      sub_dir                         or TOP

 
 &^lc           =>      $(top_srcdir)/sub/dir/lc
 &^/            =>      $(top_srcdir)/sub/dir/
 
 &^lc           =>      $(top_srcdir)/sub/dir/lc
 &^/            =>      $(top_srcdir)/sub/dir/

+&^.            =>      $(top_srcdir)/sub/dir

 
 &~lc           =>      $(top_srcdir)/lc
 &~/            =>      $(top_srcdir)/
 
 &~lc           =>      $(top_srcdir)/lc
 &~/            =>      $(top_srcdir)/

+&~.            =>      $(top_srcdir)

 
 In general:
 
 In general:

-    =  return subdir without delimiter (not allowed with `^' `~')

     ^   pathname of this subdirectory in source tree
     ~   pathname of top level of source tree
     ^   pathname of this subdirectory in source tree
     ~   pathname of top level of source tree

-    /  terminates the escape (needed if next is not lwsp or space)
+    /  terminates the path escape } needed if next is
+    _   terminates the var escape  } not lwsp or space)
+    .   terminates path escape giving dir name (excluding /)
+    =  terminates var escape giving only prefix part (rarely needed)

   lwsp  starts multi-word processing (see below)
 
 So pathname syntax is a subset of:
   lwsp  starts multi-word processing (see below)
 
 So pathname syntax is a subset of:

-    '&' [ '^' | '~' ] [ lc | '/' ]
+    '&' [ '^' | '~' ] [ lc | '/' | '.' | '=' ]

 
 &&             =>      &&              for convenience in shell runes
 \&             =>      &               general escaping mechanism
 
 &&             =>      &&              for convenience in shell runes
 \&             =>      &               general escaping mechanism