splitting things out

ke/Makefile

@@ -1,5 +1,5 @@
 BIN :=		ke
-OBJS :=		main.o
+OBJS :=		main.o abuf.o
 
 LDFLAGS :=
 CFLAGS :=	-pedantic -Wall -Werror -Wextra -O0 -std=c99 -g
@@ -10,8 +10,8 @@ all: build
 .PHONY: build
 build: $(BIN)
 
-$(BIN): main.c
-	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ main.c
+$(BIN): $(OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJS)
 
 .PHONY: clean
 clean:
@@ -30,4 +30,3 @@ install: $(BIN)
 	cp $(BIN) $(HOME)/bin/
 
 %.o: %.c
-

ke/abuf.c

@@ -0,0 +1,27 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "abuf.h"
+
+
+void
+ab_append(struct abuf *buf, const char *s, int len)
+{
+	char	*nc = realloc(buf->b, buf->len + len);
+
+	if (nc == NULL) {
+		abort();
+	}
+
+	memcpy(&nc[buf->len], s, len);
+	buf->b = nc;
+	buf->len += len; /* DANGER: overflow */
+}
+
+
+void
+ab_free(struct abuf *buf)
+{
+	free(buf->b);
+	buf->b = NULL;
+}

ke/abuf.h

@@ -0,0 +1,17 @@
+#ifndef KE_ABUF_H
+#define KE_ABUF_H
+
+struct abuf {
+	char	*b;
+	int	 len;
+};
+
+#define ABUF_INIT	{NULL, 0}
+
+
+void	ab_append(struct abuf *buf, const char *s, int len);
+void	ab_free(struct abuf *buf);
+
+
+
+#endif /* KE_ABUF_H */

ke/main.c

@@ -5,6 +5,7 @@
  * https://viewsourcecode.org/snaptoken/kilo/
  */
 #include <sys/ioctl.h>
+
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
@@ -17,6 +18,8 @@
 #include <time.h>
 #include <unistd.h>
 
+#include "abuf.h"
+
 
 #define	KE_VERSION	"0.0.1-pre"
 #define ESCSEQ		"\x1b["
@@ -82,36 +85,6 @@ struct {
 } editor;
 
 
-/* append buffer */
-struct abuf {
-	char	*b;
-	int	 len;
-};
-#define ABUF_INIT	{NULL, 0}
-
-
-void
-ab_append(struct abuf *buf, const char *s, int len)
-{
-	char	*nc = realloc(buf->b, buf->len + len);
-
-	if (nc == NULL) {
-		abort();
-	}
-
-	memcpy(&nc[buf->len], s, len);
-	buf->b = nc;
-	buf->len += len; /* DANGER: overflow */
-}
-
-
-void
-ab_free(struct abuf *buf)
-{
-	free(buf->b);
-	buf->b = NULL;
-}
-
 
 void
 die(const char *s)