linenoise: callback for checking syntax completeness.

The idea is that when the user types Enter to submit a line,
it can be checked whether it is complete syntax using a
callback. If the callback indicates that the syntax is
incomplete (there are open expressions, string literals or
whatever), then Enter is inserted verbatim. This is active
in multi-line mode only.

* linenoise.c (struct lino_state): New members, enter_callback
and ce_ctx.
(lino_set_enter_cb): New function.
(edit): If enter is issued, and multi-line mode is in effect,
and there is an enter callback, then call it. If the callback
returns false, then just insert the character.

* linenoise.h (lino_enter_cb_t): New typedef.
(lino_set_enter_cb): Declared.

1 files changed, 3 insertions, 0 deletions

diff --git a/linenoise/linenoise.h b/linenoise/linenoise.h
index 28b304a4..b07b15ea 100644
--- a/linenoise/linenoise.h
+++ b/linenoise/linenoise.h
@@ -80,3 +80,6 @@ int lino_get_noninteractive(lino_t *);
 
 typedef char *lino_atom_cb_t(lino_t *, const char *line, int n, void *ctx);
 void lino_set_atom_cb(lino_t *, lino_atom_cb_t *, void *ctx);
+
+typedef int lino_enter_cb_t(const char *line, void *ctx);
+void lino_set_enter_cb(lino_t *, lino_enter_cb_t *, void *ctx);