# `GanttEx.Marker`
[🔗](https://github.com/rocket4ce/gantt_ex/blob/v0.1.0/lib/gantt_ex/marker.ex#L1)

A vertical line on the timeline marking a date (a release, a freeze, today...).

Markers are given to `GanttEx.Live.Gantt` with the `markers` attribute;
`today_marker` adds one for the current date.

    iex> {:ok, marker} = GanttEx.Marker.new(%{date: "2025-03-01", text: "Release", color: "#e11d48"})
    iex> {marker.date, marker.text, marker.color}
    {~N[2025-03-01 00:00:00], "Release", "#e11d48"}

    iex> GanttEx.Marker.new(text: "No date")
    {:error, {:invalid, :date}}

# `t`

```elixir
@type t() :: %GanttEx.Marker{
  class: String.t() | nil,
  color: String.t() | nil,
  date: NaiveDateTime.t(),
  id: term(),
  text: String.t()
}
```

# `new`

```elixir
@spec new(map() | keyword() | t()) :: {:ok, t()} | {:error, {:invalid, atom()}}
```

Builds a marker from a map or keyword list.

# `new!`

```elixir
@spec new!(map() | keyword() | t()) :: t()
```

Like `new/1` but raises `ArgumentError`.

---

*Consult [api-reference.md](api-reference.md) for complete listing*