1 files changed, 11 insertions, 3 deletions
diff --git a/src/command/mod_master_factor.zig b/src/command/mod_master_factor.zig
index 2e2a73c..ec8065a 100644
--- a/src/command/mod_master_factor.zig
+++ b/src/command/mod_master_factor.zig
@@ -19,12 +19,20 @@ const std = @import("std");
 
 const c = @import("../c.zig");
 
-const Arg = @import("../Command.zig").Arg;
+const Error = @import("../command.zig").Error;
 const Seat = @import("../Seat.zig");
 
 /// Modify the percent of the width of the screen that the master views occupy.
-pub fn modMasterFactor(seat: *Seat, arg: Arg) void {
-    const delta = arg.float;
+pub fn modMasterFactor(
+    allocator: *std.mem.Allocator,
+    seat: *Seat,
+    args: []const []const u8,
+    failure_message: *[]const u8,
+) Error!void {
+    if (args.len < 2) return Error.NotEnoughArguments;
+    if (args.len > 2) return Error.TooManyArguments;
+
+    const delta = try std.fmt.parseFloat(f64, args[1]);
     const output = seat.focused_output;
     const new_master_factor = std.math.min(
         std.math.max(output.master_factor + delta, 0.05),