* Partial line completion.

configure.ac

@@ -15,6 +15,7 @@ AM_INIT_AUTOMAKE(-Wall -Werror -Wportability subdir-objects
 AC_CONFIG_HEADERS([config.h])
 
 # Checks for programs.
+PKG_PROG_PKG_CONFIG
 AC_PROG_CC
 AC_PROG_YACC
 AM_MISSING_PROG(HELP2MAN, help2man, $missing_dir)
@@ -34,6 +35,13 @@ AC_SUBST(WARN_CFLAGS)
 
 # Checks for library functions.
 AC_SEARCH_LIBS([pow], [m])
+# AC_SEARCH_LIBS([initscr], [ncurses])
+# AC_SEARCH_LIBS([el_init], [edit])
+# AC_SEARCH_LIBS([readline], [readline], , ,[-lncurses])
+# AC_SEARCH_LIBS([readline], [edit], , ,[-lncurses])
+PKG_CHECK_MODULES([LIBEDIT], [libedit],
+	[ AC_DEFINE([HAVE_LIBEDIT], [1], [Use libedit]) ],
+	[ AC_DEFINE([HAVE_LIBEDIT], [0], [Use libedit]) ])
 
 AC_CONFIG_FILES([Makefile
 		 src/Makefile

src/Makefile.am

@@ -1,8 +1,9 @@
-AM_CFLAGS = $(WARN_CFLAGS)
 BUILT_SOURCES = grammar.h
 AM_YFLAGS = -d
 bin_PROGRAMS = bas55
-bas55_CFLAGS = $(AM_CFLAGS)
+bas55_CPPFLAGS = $(LIBEDIT_CFLAGS)
+bas55_CFLAGS = $(WARN_CFLAGS)
+bas55_LDADD = $(LIBEDIT_LIBS)
 bas55_SOURCES =	ecma55.c ecma55.h \
 		cmd.c code.c \
 		codedvar.c data.c \

src/cmd.c

@@ -312,7 +312,7 @@ int load(const char *fname, int max_errors, int batch_mode)
 
 	nerrors = 0;
 	linecnt = 0;
-	while ((ecode = get_line(line, sizeof line, fp)) != E_EOF) {
+	while ((ecode = get_line("", line, sizeof line, fp)) != E_EOF) {
 		linecnt++;
 		if (ecode == E_LINE_TOO_LONG) {
 print_and_continue:	fprintf(stderr, "%s:", fname);

src/ecma55.c

@@ -21,14 +21,14 @@ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
+#include <config.h>
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "config.h"
 #include "ecma55.h"
 #include "ngetopt.h"
 
@@ -155,6 +155,8 @@ int main(int argc, char *argv[])
 		exit(EXIT_FAILURE);
 	}
 
+	init_readline();
+
 	if (argc == ngo.optind) {
 		s_debug_mode = 1;
 		edit();

src/ecma55.h

@@ -65,7 +65,8 @@ void edit(void);
 
 enum error_code grow_array(void *p, int elem_size, int cur_len, int grow_k,
     void **new_array, int *new_len);
-enum error_code get_line(char *buf, int maxlen, FILE *fp);
+void init_readline(void);
+enum error_code get_line(const char *prompt, char *buf, int maxlen, FILE *fp);
 size_t min_size(size_t a, size_t b);
 void toupper_str(char *str);
 void copy_to_str(char *dst, const char *src, size_t len);

src/edit.c

@@ -25,6 +25,13 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <ctype.h>
 #include <limits.h>
 #include <stdio.h>
+
+// #include <stdlib.h>
+// #include <string.h>
+// #include <editline/readline.h>
+// #include <readline/readline.h>
+// #include <readline/history.h>
+
 #include "ecma55.h"
 
 static void pready (void)
@@ -43,7 +50,7 @@ void edit(void)
 	print_version(stderr);
 	fputs("\nType HELP for a list of allowed commands.\n\n", stderr);
 	pready();
-	while ((ecode = get_line(line, sizeof(line), stdin)) != E_EOF) {
+	while ((ecode = get_line("", line, sizeof(line), stdin)) != E_EOF) {
 		if (ecode == E_LINE_TOO_LONG) {
 			eprint(E_LINE_TOO_LONG);
 			enl();