Infer ticks bug

gerbil_repro001.gleam

pub fn main() {
  let start = t("2026-09-19T11:42:45.879Z")
  let end = t("2026-09-19T11:57:45.879Z")
  let values = [
    #(t("2026-09-19T11:42:46Z"), 13.28),
    #(t("2026-09-19T11:46:06Z"), 13.28),
    #(t("2026-09-19T11:49:26Z"), 13.28),
    #(t("2026-09-19T11:52:46Z"), 13.28),
    #(t("2026-09-19T11:56:06Z"), 13.28),
  ]

  let y = axis.float()
  let x =
    axis.timestamp()
    |> axis.infer_ticks(5)
    |> axis.min(start)
    |> axis.max(end)
    |> axis.show_labels(fn(label) {
      timestamp.to_calendar(label, calendar.local_offset())
      |> pair.second
      |> format_time
    })

  let points =
    list.map(values, fn(val) {
      let #(timestamp, float) = val
      chart.point(timestamp, float, [])
    })

  chart.new(x:, y:)
  |> chart.add(chart.line([], points))
  |> chart.to_svg(width: 800, height: 400)
}

fn format_time(time: calendar.TimeOfDay) {
  time.hours |> int.to_string |> string.pad_start(2, "0")
  <> ":"
  <> time.minutes |> int.to_string |> string.pad_start(2, "0")
}

fn t(ts: String) {
  let assert Ok(ts) = timestamp.parse_rfc3339(ts)
  ts
}