Refactor for cleanliness

Move files into separate folders for ease of reading, include source
directory so we can use angle bracket includes, adjust build system to
make directories for objects

lisp/reader.h

@@ -0,0 +1,98 @@
+/* Copyright (C) 2025 Aryadev Chavali
+
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License Version 2 for
+ * details.
+
+ * You may distribute and modify this code under the terms of the GNU General
+ * Public License Version 2, which you should have received a copy of along with
+ * this program.  If not, please go to <https://www.gnu.org/licenses/>.
+
+ * Created: 2025-04-16
+ * Description: Parsing Lisp!
+ */
+
+#ifndef READER_H
+#define READER_H
+
+#include <lib/vec.h>
+#include <lisp/context.h>
+#include <lisp/lisp.h>
+
+#define INPUT_CHUNK_SIZE 512
+static const char SYM_CHARS[] =
+    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+    "¬!£$%^&*_-+={[]}:@~#<,>.?/";
+
+typedef struct
+{
+  const char *name;
+  u64 offset;
+  sv_t str;
+} input_t;
+
+void input_from_sv(context_t *ctx, input_t *inp, const char *name, sv_t sv);
+void input_from_fp(context_t *ctx, input_t *input, const char *name, FILE *fp);
+bool input_eof(input_t *input);
+
+typedef struct
+{
+  u64 col, line;
+} pos_t;
+
+pos_t input_offset_to_pos(input_t *inp);
+
+typedef enum
+{
+  PERR_OK = 0,
+  PERR_EOF,
+  PERR_UNEXPECTED_CHAR,
+  PERR_EXPECTED_CLOSE_BRACKET,
+  PERR_EXPECTED_SPEECH_MARK,
+  PERR_UNEXPECTED_READER_MACRO_SYMBOL,
+  PERR_EXPECTED_BOOLEAN,
+} perr_t;
+
+static inline const char *perr_to_cstr(perr_t perr)
+{
+  switch (perr)
+  {
+  case PERR_OK:
+    return "OK";
+    break;
+  case PERR_EOF:
+    return "EOF";
+    break;
+  case PERR_UNEXPECTED_CHAR:
+    return "UNEXPECTED_CHAR";
+    break;
+  case PERR_EXPECTED_CLOSE_BRACKET:
+    return "EXPECTED_CLOSE_BRACKET";
+    break;
+  case PERR_EXPECTED_SPEECH_MARK:
+    return "EXPECTED_SPEECH_MARK";
+    break;
+  case PERR_UNEXPECTED_READER_MACRO_SYMBOL:
+    return "UNEXPECTED_READER_MACRO_SYMBOL";
+    break;
+  case PERR_EXPECTED_BOOLEAN:
+    return "EXPECTED_BOOLEAN";
+    break;
+  }
+  assert(false && "perr_to_cstr: unreachable");
+  return "";
+}
+
+typedef struct
+{
+  lisp_t *result;
+  perr_t error;
+} pres_t;
+
+perr_t parse(context_t *ctx, input_t *str, lisp_t **ret);
+perr_t parse_all(context_t *ctx, input_t *str, vec_t *vec);
+
+int print_perror(FILE *fp, input_t *inp, perr_t error);
+
+#endif