use readline instead of fputs() & fgets()

chapter_04/Makefile

@@ -2,7 +2,7 @@ all: prompt
 
 
 %: %.c
-	cc -std=c11 -Wall $@.c -o $@
+	cc -std=c11 -Wall $@.c -ledit -o $@
 
 
 .PHONY: clean

chapter_04/prompt.c

@@ -1,8 +1,7 @@
 #include <stdio.h>
+#include <stdlib.h>
 
-
-/* Declare a buffer for user input of size 2048 */
-static char input[2048];
+#include <editline/readline.h>
 
 
 int main(int argc, char const *argv[])
@@ -13,14 +12,17 @@ int main(int argc, char const *argv[])
 
     /* In a never ending loop */
     while (1) {
-        /* Output our prompt */
-        fputs("lispy> ", stdout);
+        /* Output our prompt and get input */
+        char* input = readline("lispy> ");
 
-        /* Read a line of user input of max size 2014 */
-        fgets(input, 2048, stdin);
+        /* Add input to history */
+        add_history(input);
 
         /* Echo input back to user */
-        printf("No you're a %s", input);
+        printf("No you're a %s\n", input);
+
+        /* Free retrieved input */
+        free(input);
     }
 
     return 0;