command line: --eargs semantics change.

The --eargs mechanism won't perform a blind substring
replacement of {} with the following argument. Only
arguments which match {} exactly are replaced.

* eval.c (retf): Static function becomes extern.

* eval.h (retf): Declared.

* txr.c (txr_main): Replace the filtering logic on the
split eargs argument list to just look for items
equal to the string "{}" and replace with the following
argument.

* txr.1: Updated --eargs documentation.

1 files changed, 2 insertions, 3 deletions

diff --git a/txr.c b/txr.c
index 3fdb18c0..ca80c2ca 100644
--- a/txr.c
+++ b/txr.c
@@ -573,9 +573,8 @@ int txr_main(int argc, char **argv)
       }
       arg = sub_str(arg, num(8), nil);
       arg2 = upop(&arg_list, &arg_undo);
-      arg_list = append2(mapcar(curry_123_3(func_n3(regsub),
-                                            regex_compile(lit("{}"), nil),
-                                            arg2),
+      arg_list = append2(mapcar(iffi(curry_12_2(equal_f, lit("{}")),
+                                     retf(arg2), nil),
                                 split_str(arg, sep)),
                          arg_list);
       set(eff_arg_tail, butlastn(one, deref(eff_arg_tail)));