From be43e2d010b65e0fb16f96cde3161d38fe535c31 Mon Sep 17 00:00:00 2001
From: Manlio Perillo <manlio.perillo@gmail.com>
Date: Sat, 6 May 2023 11:50:42 +0200
Subject: build: make `Exercise.hint` optional

Use an optional type, instead of an empty string, since it is more
idiomatic.
---
 build.zig | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

(limited to 'build.zig')

diff --git a/build.zig b/build.zig
index a880450..3ea34ab 100644
--- a/build.zig
+++ b/build.zig
@@ -25,7 +25,7 @@ pub const Exercise = struct {
     output: []const u8,
 
     /// This is an optional hint to give if the program does not succeed.
-    hint: []const u8 = "",
+    hint: ?[]const u8 = null,
 
     /// By default, we verify output against stderr.
     /// Set this to true to check stdout instead.
@@ -254,22 +254,16 @@ const ZiglingStep = struct {
         }
 
         const exe_path = self.compile(prog_node) catch {
-            if (self.exercise.hint.len > 0) {
-                print("\n{s}HINT: {s}{s}", .{
-                    bold_text, self.exercise.hint, reset_text,
-                });
-            }
+            if (self.exercise.hint) |hint|
+                print("\n{s}HINT: {s}{s}", .{ bold_text, hint, reset_text });
 
             self.help();
             std.os.exit(1);
         };
 
         self.run(exe_path, prog_node) catch {
-            if (self.exercise.hint.len > 0) {
-                print("\n{s}HINT: {s}{s}", .{
-                    bold_text, self.exercise.hint, reset_text,
-                });
-            }
+            if (self.exercise.hint) |hint|
+                print("\n{s}HINT: {s}{s}", .{ bold_text, hint, reset_text });
 
             self.help();
             std.os.exit(1);
-- 
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