From 8395589d15961cedc136a0cf945bd5ae93b5c7c6 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Wed, 13 Jul 2016 19:57:43 -0400
Subject: Implement -f PATH from BSD find.

---
 RELEASES.md |  1 +
 parse.c     | 29 ++++++++++++++++++++++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/RELEASES.md b/RELEASES.md
index 83007c8..e76518e 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -27,6 +27,7 @@
 - Implement `-D rates`
 - Implement `-fprint`
 - Implement `-fprint0`
+- Implement BSD's `-f`
 
 
 0.79
diff --git a/parse.c b/parse.c
index 8e01435..e5bfacb 100644
--- a/parse.c
+++ b/parse.c
@@ -786,6 +786,27 @@ static struct expr *parse_exec(struct parser_state *state, enum exec_flags flags
 	return expr;
 }
 
+/**
+ * Parse -f PATH.
+ */
+static struct expr *parse_f(struct parser_state *state) {
+	parser_advance(state, T_FLAG, 1);
+
+	const char *path = state->argv[0];
+	if (!path) {
+		pretty_error(state->cmdline->stderr_colors,
+		             "error: -f requires a path.\n");
+		return NULL;
+	}
+
+	if (!parse_root(state, path)) {
+		return NULL;
+	}
+
+	parser_advance(state, T_PATH, 1);
+	return &expr_true;
+}
+
 /**
  * Open a file for an expression.
  */
@@ -1307,7 +1328,9 @@ static struct expr *parse_literal(struct parser_state *state) {
 		break;
 
 	case 'f':
-		if (strcmp(arg, "-false") == 0) {
+		if (strcmp(arg, "-f") == 0) {
+			return parse_f(state);
+		} else if (strcmp(arg, "-false") == 0) {
 			parser_advance(state, T_TEST, 1);
 			return &expr_false;
 		} else if (strcmp(arg, "-follow") == 0) {
@@ -1857,6 +1880,10 @@ void dump_cmdline(const struct cmdline *cmdline, bool verbose) {
 	}
 
 	for (struct root *root = cmdline->roots; root; root = root->next) {
+		char c = root->path[0];
+		if (c == '-' || c == '(' || c == ')' || c == '!' || c == ',') {
+			fputs("-f ", stderr);
+		}
 		fprintf(stderr, "%s ", root->path);
 	}
 
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