move TempDir to src/os and use the real tmpDir

src/Command.zig

@@ -23,8 +23,8 @@ const Command = @This();
 
 const std = @import("std");
 const builtin = @import("builtin");
-const TempDir = @import("TempDir.zig");
 const internal_os = @import("os/main.zig");
+const TempDir = internal_os.TempDir;
 const mem = std.mem;
 const os = std.os;
 const debug = std.debug;

src/main.zig

@@ -181,7 +181,6 @@ pub const GlobalState = struct {
 test {
     _ = @import("Pty.zig");
     _ = @import("Command.zig");
-    _ = @import("TempDir.zig");
     _ = @import("font/main.zig");
     _ = @import("renderer.zig");
     _ = @import("termio.zig");

src/os/TempDir.zig

@@ -6,6 +6,7 @@ const std = @import("std");
 const builtin = @import("builtin");
 const testing = std.testing;
 const Dir = std.fs.Dir;
+const internal_os = @import("main.zig");
 
 const log = std.log.scoped(.tempdir);
 
@@ -28,8 +29,11 @@ pub fn init() !TempDir {
     var tmp_path_buf: [TMP_PATH_LEN:0]u8 = undefined;
     var rand_buf: [RANDOM_BYTES]u8 = undefined;
 
-    // TODO: use the real temp dir not cwd
-    const dir = std.fs.cwd();
+    const dir = dir: {
+        const cwd = std.fs.cwd();
+        const tmp_dir = internal_os.tmpDir() orelse break :dir cwd;
+        break :dir try cwd.openDir(tmp_dir, .{});
+    };
 
     // We now loop forever until we can find a directory that we can create.
     while (true) {

src/os/main.zig

@@ -6,3 +6,4 @@ pub usingnamespace @import("flatpak.zig");
 pub usingnamespace @import("locale.zig");
 pub usingnamespace @import("macos_version.zig");
 pub usingnamespace @import("mouse.zig");
+pub const TempDir = @import("TempDir.zig");