From 800c61339432258e8dad0ca7c56ddface84cab87 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Thu, 18 Aug 2022 20:52:07 +0200
Subject: Made the timestamp function mockable for testing purposes

---
 src/interpreter.zig |  4 ++--
 src/main.zig        |  5 ++++-
 src/pointer.zig     | 13 +++++++++----
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/src/interpreter.zig b/src/interpreter.zig
index c378c11..9fb98a1 100644
--- a/src/interpreter.zig
+++ b/src/interpreter.zig
@@ -13,13 +13,13 @@ pub const Interpreter = struct {
         self.field.deinit();
         self.allocator.destroy(self);
     }
-    pub fn init(allocator: std.mem.Allocator, fileReader: anytype, args: []const []const u8, env: []const [*:0]const u8) !*Interpreter {
+    pub fn init(allocator: std.mem.Allocator, fileReader: anytype, timestamp: fn () i64, args: []const []const u8, env: []const [*:0]const u8) !*Interpreter {
         var i = try allocator.create(Interpreter);
         errdefer allocator.destroy(i);
         i.allocator = allocator;
         i.field = try field.Field.init_from_reader(allocator, fileReader);
         errdefer i.field.deinit();
-        i.pointer = try pointer.Pointer.init(std.testing.allocator, i.field, args, env);
+        i.pointer = try pointer.Pointer.init(std.testing.allocator, i.field, timestamp, args, env);
         errdefer i.pointer.deinit();
         return i;
     }
diff --git a/src/main.zig b/src/main.zig
index 1608b87..4408283 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -16,13 +16,16 @@ pub fn main() anyerror!void {
     defer file.close();
 
     const env: []const [*:0]const u8 = std.os.environ;
-    var i = try interpreter.Interpreter.init(gpa.allocator(), file.reader(), args, env[0..]);
+    var i = try interpreter.Interpreter.init(gpa.allocator(), file.reader(), std.time.timestamp, args, env[0..]);
     defer i.deinit();
 
     var ioContext = io.context(std.io.getStdIn().reader(), std.io.getStdOut().writer());
     std.os.exit(@intCast(u8, try i.run(&ioContext)));
 }
 
+fn testTimestamp() i64 {
+    return 1660681247;
+}
 test "all" {
     std.testing.refAllDecls(@This());
 }
diff --git a/src/pointer.zig b/src/pointer.zig
index 2f13049..eedae33 100644
--- a/src/pointer.zig
+++ b/src/pointer.zig
@@ -26,6 +26,7 @@ pub const Pointer = struct {
     env: []const [*:0]const u8,
     argv: []const []const u8,
     rand: *std.rand.Random,
+    timestamp: fn () i64,
 
     pub fn deinit(self: *Pointer) void {
         self.ss.deinit();
@@ -243,7 +244,7 @@ pub const Pointer = struct {
                 // 17
                 try p.ss.toss.push(@intCast(i64, p.ss.data.items.len) + 1);
                 // 16
-                const now = std.time.epoch.EpochSeconds{ .secs = @intCast(u64, std.time.timestamp()) };
+                const now = std.time.epoch.EpochSeconds{ .secs = @intCast(u64, p.timestamp()) };
                 const epochDay = now.getEpochDay();
                 const daySeconds = now.getDaySeconds();
                 try p.ss.toss.push(@intCast(i64, daySeconds.getHoursIntoDay()) * 256 * 256 + @intCast(i64, daySeconds.getMinutesIntoHour()) * 256 + @intCast(i64, daySeconds.getSecondsIntoMinute()));
@@ -347,7 +348,7 @@ pub const Pointer = struct {
         self.step();
         return result;
     }
-    pub fn init(allocator: std.mem.Allocator, f: *field.Field, argv: []const []const u8, env: []const [*:0]const u8) !*Pointer {
+    pub fn init(allocator: std.mem.Allocator, f: *field.Field, timestamp: fn () i64, argv: []const []const u8, env: []const [*:0]const u8) !*Pointer {
         var p = try allocator.create(Pointer);
         errdefer allocator.destroy(p);
         p.allocator = allocator;
@@ -368,6 +369,7 @@ pub const Pointer = struct {
         try std.os.getrandom(std.mem.asBytes(&seed));
         var prng = std.rand.DefaultPrng.init(seed);
         p.rand = &prng.random();
+        p.timestamp = timestamp;
         return p;
     }
     inline fn redirect(p: *Pointer, c: i64) bool {
@@ -429,6 +431,9 @@ pub const Pointer = struct {
     }
 };
 
+fn testTimestamp() i64 {
+    return 1660681247;
+}
 test "all" {
     std.testing.refAllDecls(@This());
 }
@@ -438,7 +443,7 @@ test "minimal" {
     defer f.deinit();
     const argv = [_][]const u8{"minimal"};
     const env = [_][*:0]const u8{"ENV=TEST"};
-    var p = try Pointer.init(std.testing.allocator, f, argv[0..], env[0..]);
+    var p = try Pointer.init(std.testing.allocator, f, testTimestamp, argv[0..], env[0..]);
     defer p.deinit();
     var ioContext = io.context(std.io.getStdIn().reader(), std.io.getStdOut().writer());
     try std.testing.expectEqual(p.exec(&ioContext), pointerReturn{});
@@ -449,7 +454,7 @@ test "almost minimal" {
     defer f.deinit();
     const argv = [_][]const u8{"minimal"};
     const env = [_][*:0]const u8{"ENV=TEST"};
-    var p = try Pointer.init(std.testing.allocator, f, argv[0..], env[0..]);
+    var p = try Pointer.init(std.testing.allocator, f, testTimestamp, argv[0..], env[0..]);
     defer p.deinit();
     var ioContext = io.context(std.io.getStdIn().reader(), std.io.getStdOut().writer());
     try std.testing.expectEqual(p.exec(&ioContext), pointerReturn{});
-- 
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