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diff --git a/bfs.h b/bfs.h
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+/*********************************************************************
+ * bfs                                                               *
+ * Copyright (C) 2015 Tavian Barnes <tavianator@tavianator.com>      *
+ *                                                                   *
+ * This program is free software. It comes without any warranty, to  *
+ * the extent permitted by applicable law. You can redistribute it   *
+ * and/or modify it under the terms of the Do What The Fuck You Want *
+ * To Public License, Version 2, as published by Sam Hocevar. See    *
+ * the COPYING file or http://www.wtfpl.net/ for more details.       *
+ *********************************************************************/
+
+#ifndef BFS_H
+#define BFS_H
+
+#include "color.h"
+#include <stdbool.h>
+#include <stddef.h>
+
+/**
+ * The parsed command line.
+ */
+typedef struct cmdline cmdline;
+
+/**
+ * A command line expression.
+ */
+typedef struct expression expression;
+
+/**
+ * Ephemeral state for evaluating an expression.
+ */
+typedef struct eval_state eval_state;
+
+/**
+ * Expression evaluation function.
+ *
+ * @param expr
+ *         The current expression.
+ * @param state
+ *         The current evaluation state.
+ * @return
+ *         The result of the test.
+ */
+typedef bool eval_fn(const expression *expr, eval_state *state);
+
+struct cmdline {
+	/** The array of paths to start from. */
+	const char **roots;
+	/** The number of root paths. */
+	size_t nroots;
+
+	/** Color data. */
+	color_table *colors;
+	/** -color option. */
+	bool color;
+
+	/** -mindepth option. */
+	int mindepth;
+	/** -maxdepth option. */
+	int maxdepth;
+
+	/** bftw() flags. */
+	int flags;
+
+	/** The command line expression. */
+	expression *expr;
+};
+
+struct expression {
+	/** The left hand side of the expression. */
+	expression *lhs;
+	/** The right hand side of the expression. */
+	expression *rhs;
+	/** The function that evaluates this expression. */
+	eval_fn *eval;
+	/** Optional integer data for this expression. */
+	int idata;
+	/** Optional string data for this expression. */
+	const char *sdata;
+};
+
+/**
+ * Parse the command line.
+ */
+cmdline *parse_cmdline(int argc, char *argv[]);
+
+/**
+ * Evaluate the command line.
+ */
+int eval_cmdline(cmdline *cl);
+
+/**
+ * Free the parsed command line.
+ */
+void free_cmdline(cmdline *cl);
+
+// Predicate evaluation functions
+bool eval_access(const expression *expr, eval_state *state);
+bool eval_delete(const expression *expr, eval_state *state);
+bool eval_false(const expression *expr, eval_state *state);
+bool eval_hidden(const expression *expr, eval_state *state);
+bool eval_name(const expression *expr, eval_state *state);
+bool eval_nohidden(const expression *expr, eval_state *state);
+bool eval_path(const expression *expr, eval_state *state);
+bool eval_print(const expression *expr, eval_state *state);
+bool eval_print0(const expression *expr, eval_state *state);
+bool eval_prune(const expression *expr, eval_state *state);
+bool eval_quit(const expression *expr, eval_state *state);
+bool eval_true(const expression *expr, eval_state *state);
+bool eval_type(const expression *expr, eval_state *state);
+
+// Operator evaluation functions
+bool eval_not(const expression *expr, eval_state *state);
+bool eval_and(const expression *expr, eval_state *state);
+bool eval_or(const expression *expr, eval_state *state);
+bool eval_comma(const expression *expr, eval_state *state);
+
+#endif // BFS_H