Replacement strings

[Ole Tange]

Currently GNU Parallel has 6 replacement strings:

{} = A/B/C.D.E
{.} = A/B/C.D
{#} = Job number
{%} = Job slot
{//} = A/B
{/} = C.D.E
{/.} = C.D

(Plus the numbered {1} and {-1}).

But there has been a demand for removing two extensions and a
replacement string for the removed extension. If these should be
implemented, I would like to have a more general syntax. It could be
something like:

{+.} = E
{+/} = A/B
{..} = A/B/C
{+..} = D.E

{} = {.}.{+.} = {+/}/{/} = {+/}/{/.}.{+.} = {..}.{+..}

The idea is here that '+' matches the opposite of the non-+ version
(except for the . or / separating). {//} would be the only redundant
string (in the new syntax that is {+/}).

If it is easy to implement then {...} {/..} {/...} and the +-versions
should work, too.

There would still no replacement string for 'A', 'B' or 'D'.

Better ideas for syntax? Is there any good existing syntax for
replacements that would make sense? E.g. FEX
http://www.semicomplete.com/projects/fex/


/Ole