New --debug-expansion option.

* txr.c (opt_dbg_expansion): New global variable.
(help): Print summary for --debug-expansion.
(txr_main): Recognize new option and set flag.

* parser.y (parse_once): Suppress debug stepping around parser
if opt_dbg_expansion is false.

* txr.1 (opt_dbg_expansion): Declared.

* txr.1: Documented new option.

1 files changed, 7 insertions, 1 deletions

diff --git a/txr.1 b/txr.1
index 0fd199c8..1c8f20c3 100644
--- a/txr.1
+++ b/txr.1
@@ -687,10 +687,16 @@ function for a description.
 .meIP --debug-autoload
 This option turns on debugging, like
 .code --debugger
-but also arranges for stepping into the auto-load processing of
+but also requests stepping into the auto-load processing of
 \*(TL library code.  Normally, debugging through the evaluations
 triggered by auto-loading is suppressed.
 
+.meIP --debug-expansion
+This option turns on debugging, like
+.code --debugger
+but also requests stepping into the parse-time macro-expansion
+of \*(TL code embedded in \*(TX queries. Normally, this is suppressed.
+
 .coIP --help
 Prints usage summary on standard output, and terminates successfully.