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std.cli: ?[]T now is null on empty slices

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Signed-off-by: Pablo Alessandro Santos Hugen <phugen@redhat.com>
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Pablo Alessandro Santos Hugen 2026-03-05 22:03:19 -03:00 • committed by Alex Rønne Petersen
parent 8f77a3b481
commit f6a7ba6ab9
1 changed files with 8 additions and 1 deletions
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9
lib/std/cli.zig
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@ -212,10 +212,17 @@ fn parseBool(comptime T: type, iter: *Iterator) Error!T {
}
fn parseOptional(comptime T: type, iter: *Iterator, allocator: Allocator) (Error || Allocator.Error)!T {
return parseValue(@typeInfo(T).optional.child, iter, allocator) catch |err| switch (err) {
const ChildT = @typeInfo(T).optional.child;
const val = parseValue(ChildT, iter, allocator) catch |err| return switch (err) {
Error.MissingValue => null,
else => err,
};
// Optional steals empty state from slices
const child_info = @typeInfo(ChildT);
return if (child_info == .pointer and child_info.pointer.size == .slice and val.len == 0)
null
else
val;
}
inline fn flagName(arg: []const u8) ?[]const u8 {