From b86d3361836935297c6aedb0318ed8a34e4c52f0 Mon Sep 17 00:00:00 2001
From: Felix Perktold <Felix.Perktold@student.uibk.ac.at>
Date: Sun, 18 Jan 2026 14:21:34 +0100
Subject: refactor lisp.h into public lisp_api.h and internal lisp.h

---
 Makefile   |  2 +-
 lisp.c     |  1 +
 lisp.h     | 45 ---------------------------------------------
 lisp.y     |  1 +
 lisp_api.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 main.c     |  1 +
 test.c     |  1 +
 7 files changed, 57 insertions(+), 46 deletions(-)
 create mode 100644 lisp_api.h

diff --git a/Makefile b/Makefile
index a04723e..6feb95e 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ OBJS	= lisp.o lisp.tab.o lex.yy.o
 main: main.c $(OBJS)
 	$(CC) $(CFLAGS) -o $@ main.c $(OBJS) $(LIBS)
 
-lisp.o: lisp.c lisp.h lex.yy.o
+lisp.o: lisp.c lisp_api.h lisp.h lex.yy.o
 	$(CC) $(CFLAGS) -c lisp.c
 
 lisp.tab.c lisp.tab.h: lisp.y
diff --git a/lisp.c b/lisp.c
index 4e143f1..d5f9600 100644
--- a/lisp.c
+++ b/lisp.c
@@ -3,6 +3,7 @@
 #include <readline/readline.h>
 #include <readline/history.h>
 #include <math.h>
+#include "lisp_api.h"
 #include "lisp.h"
 #include "lex.yy.h"
 #include "lisp.tab.h"
diff --git a/lisp.h b/lisp.h
index a422c9b..a972ecc 100644
--- a/lisp.h
+++ b/lisp.h
@@ -4,51 +4,6 @@
 typedef struct value value;
 typedef struct env env;
 
-typedef enum {
-	VT_INT,
-	VT_DOUBLE,
-	VT_SYMBOL,
-	VT_STRING,
-	VT_NIL,
-	VT_PAIR,
-	VT_LAMBDA,
-	VT_BUILTIN
-} val_type;
-
-struct value {
-	val_type type;
-	union {
-		int i;
-		double d;
-		const char *sym;
-		const char *str;
-		struct {
-			value *car;
-			value *cdr;
-		} pair;
-		struct {
-			value *params;
-			value *body;
-			env *env;
-		} lambda;
-		struct {
-			value *(*fn) (env *, value *);
-		} builtin;
-	} as;
-};
-
-value *make_int(int i);
-value *make_double(double d);
-value *make_symbol(const char *sym);
-value *make_string(const char *str);
-value *make_nil();
-value *make_lambda(env *e, value *params, value *body);
-value *make_builtin(value *(*fn) (env *, value *));
-value *cons(value *car, value *cdr);
-value *car(value *cons);
-value *cdr(value *cons);
-value *reverse(value *list);
-
 void print_value(value *val);
 void println_value(value *val);
 // environments, TODO: make this use hashtable
diff --git a/lisp.y b/lisp.y
index a4ed142..ec246f3 100644
--- a/lisp.y
+++ b/lisp.y
@@ -1,6 +1,7 @@
 %{
 #include <stdio.h>
 #include <stdlib.h>
+#include "lisp_api.h"
 #include "lisp.h"
 
 int yylex(void);
diff --git a/lisp_api.h b/lisp_api.h
new file mode 100644
index 0000000..70d317b
--- /dev/null
+++ b/lisp_api.h
@@ -0,0 +1,52 @@
+#ifndef LISP_API_H
+#define LISP_API_H
+
+typedef struct value value;
+typedef struct env env;
+
+typedef enum {
+	VT_INT,
+	VT_DOUBLE,
+	VT_SYMBOL,
+	VT_STRING,
+	VT_NIL,
+	VT_PAIR,
+	VT_LAMBDA,
+	VT_BUILTIN
+} val_type;
+
+struct value {
+	val_type type;
+	union {
+		int i;
+		double d;
+		const char *sym;
+		const char *str;
+		struct {
+			value *car;
+			value *cdr;
+		} pair;
+		struct {
+			value *params;
+			value *body;
+			env *env;
+		} lambda;
+		struct {
+			value *(*fn) (env *, value *);
+		} builtin;
+	} as;
+};
+
+value *make_int(int i);
+value *make_double(double d);
+value *make_symbol(const char *sym);
+value *make_string(const char *str);
+value *make_nil();
+value *make_lambda(env *e, value *params, value *body);
+value *make_builtin(value *(*fn) (env *, value *));
+value *cons(value *car, value *cdr);
+value *car(value *cons);
+value *cdr(value *cons);
+value *reverse(value *list);
+
+#endif
diff --git a/main.c b/main.c
index b675dfa..73adf2d 100644
--- a/main.c
+++ b/main.c
@@ -3,6 +3,7 @@
 #include <signal.h>
 #include <readline/readline.h>
 #include <readline/history.h>
+#include "lisp_api.h"
 #include "lisp.h"
 #include "lex.yy.h"
 #include "lisp.tab.h"
diff --git a/test.c b/test.c
index 95cce3f..5bc1ff4 100644
--- a/test.c
+++ b/test.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include "lisp_api.h"
 #include "lisp.h"
 #include "lex.yy.h"
 #include "lisp.tab.h"
-- 
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