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core: list valid options if an invalid value is detected parsing an enum

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This commit is contained in:
Jeffrey C. Ollie
2024-11-02 23:30:21 -05:00
parent 75fe0b2dfb
commit ca844ca3c0
1 changed files with 23 additions and 1 deletions
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24
src/cli/args.zig
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@ -133,7 +133,29 @@ pub fn parse(
error.OutOfMemory => return err,
error.InvalidField => "unknown field",
error.ValueRequired => "value required",
error.InvalidValue => "invalid value",
error.InvalidValue => msg: {
var buf = std.ArrayList(u8).init(arena_alloc);
errdefer buf.deinit();
const writer = buf.writer();
try writer.print("invalid value \"{?s}\"", .{value});
const typeinfo = @typeInfo(T);
inline for (typeinfo.Struct.fields) |f| {
if (std.mem.eql(u8, key, f.name)) {
switch (@typeInfo(f.type)) {
.Enum => |e| {
try writer.print(", valid values are: ", .{});
inline for (e.fields, 0..) |field, i| {
if (i != 0) try writer.print(", ", .{});
try writer.print("{s}", .{field.name});
}
},
else => {},
}
break;
}
}
break :msg try buf.toOwnedSliceSentinel(0);
},
else => try std.fmt.allocPrintZ(
arena_alloc,
"unknown error {}",