From 738e53849d39db2cba7c7fd97dd74a64bcafe363 Mon Sep 17 00:00:00 2001
From: Daniel Cerqueira <dan.git@lispclub.com>
Date: Tue, 18 Aug 2026 11:59:36 +0100
Subject: use readline

---
 Makefile |  5 ++++-
 lali.c   | 62 +++++++++++++++++++++++++++++++++++++++-----------------------
 2 files changed, 43 insertions(+), 24 deletions(-)

diff --git a/Makefile b/Makefile
index f9542d8..68d5d71 100644
--- a/Makefile
+++ b/Makefile
@@ -47,22 +47,25 @@ PREFIX ?= /usr/local
 .PHONY: native
 native: CPPFLAGS += -DNDEBUG
 native: CFLAGS   += -O2
+native: LDFLAGS  += -lreadline
 native: $(PROGRAM)
 
 .PHONY: generic
 generic: CPPFLAGS += -DNDEBUG
 generic: CFLAGS   += -mtune=generic -O2
+generic: LDFLAGS  += -lreadline
 generic: $(PROGRAM)
 
 .PHONY: all
 all: CPPFLAGS += -DNDEBUG
 all: CFLAGS   += -O2
+all: LDFLAGS  += -lreadline
 all: $(PROGRAM) $(LIB) $(HTML)
 
 .PHONY: debug
 debug: CPPFLAGS += -DDEBUG
 debug: CFLAGS   += -O0 -g
-debug: LDFLAGS  += -g
+debug: LDFLAGS  += -lreadline
 debug: $(PROGRAM)
 
 .PHONY: clean
diff --git a/lali.c b/lali.c
index 4ffa35b..48d4731 100644
--- a/lali.c
+++ b/lali.c
@@ -33,8 +33,13 @@
 
 
 #include "liblali.h"
+
 #include <getopt.h>
 
+#include <readline/readline.h>
+#include <readline/history.h>
+
+
 #define YEARS                "2025, 2026"
 
 // MAIN ///////////////////////////////////////////////////////////////////////
@@ -58,31 +63,42 @@ void runFile(int infd, Object **env, GC_PARAM) {
 }
 
 void runREPL(int infd, Object **env, GC_PARAM) {
-  Stream stream = { STREAM_TYPE_FILE, .fd = infd };
+  /// STRING
+  char *replLine = (char *)NULL;
+  Stream stream = { STREAM_TYPE_STRING, .buffer = "" };
   GC_TRACE(gcObject, nil);
 
-  for (;;) {
-    if (setjmp(exceptionEnv))
-      continue;
-
-    for (;;) {
-      *gcObject = nil;
-
-      fputs("lali> ", stdout);
-      fflush(stdout);
-
-      if (peekNext(&stream) == EOF) {
-        fputc('\n', stdout);
-        return;
-      }
-
-      *gcObject = readExpr(&stream, GC_ROOTS);
-      *gcObject = evalExpr(gcObject, env, GC_ROOTS);
-
-      writeObject(*gcObject, true, stdout);
-      fputc('\n', stdout);
-    }
-  }
+  do {
+	 /* If the buffer has already been allocated,
+		 return the memory to the free pool. */
+	 if (replLine) {
+		free(replLine);
+		replLine = (char *)NULL;
+	 }
+
+	 replLine = readline("lali> ");
+
+	 stream.length = 0;
+	 stream.offset = 0;
+	 stream.buffer = replLine;
+
+	 while (peekNext(&stream) != EOF) {
+		*gcObject = nil;
+		*gcObject = readExpr(&stream, GC_ROOTS);
+		*gcObject = evalExpr(gcObject, env, GC_ROOTS);
+		writeObject(*gcObject, true, stdout);
+		fputc('\n', stdout);
+	 }
+
+	 // If the line has any text in it, save it on the history.
+	 if (replLine && *replLine)
+		add_history (replLine);
+
+  } while (replLine != NULL);
+
+  fputc('\n', stdout);
+  stream.buffer = (char *)NULL;
+  free(replLine);
 }
 
 int main(int argc, char *argv[]) {
-- 
cgit