Basic REPL based on linenoise.

* Makefile (OBJS): Only include linenoise.o if
have_termios is y.

* configure: Adding test for termios.
(have_termios): New configure and config.make variable.
(gen_config_make): Generate have_termios variable.

* parser.c (repl): New function.

* parser.h (repl): Declared.

* txr.c (help): Summarize new -i option.
(txr_main): Implement -i repl.

1 files changed, 21 insertions, 0 deletions

diff --git a/configure b/configure
index 72653709..7be5cffa 100755
--- a/configure
+++ b/configure
@@ -123,6 +123,7 @@ need_darwin_c_source=
 have_git=
 have_pwuid=
 have_alloca=
+have_termios=
 conf_dir=config
 config_h=$conf_dir/config.h
 config_make=$conf_dir/config.make
@@ -649,6 +650,8 @@ have_glob := $have_glob
 # do we modern posix signal handling?
 have_posix_sigs := $have_posix_sigs
 
+have_termios := $have_termios
+
 # do we compile in debug support?
 debug_support := $debug_support
 
@@ -2128,6 +2131,24 @@ if [ -z "$have_alloca" ] ; then
   printf "no\n"
 fi
 
+printf "Checking for termios ... "
+
+cat > conftest.c <<!
+#include <termios.h>
+
+int main(int argc, char **argv)
+{
+  struct termios t;
+  return 0;
+}
+!
+
+if conftest ; then
+  printf "yes\n"
+  printf "#define HAVE_TERMIOS 1\n" >> $config_h
+  have_termios=y
+fi
+
 #
 # Dependent variables
 #