{# Header breadcrumb (clickable path): where the node stands in the tree, and
   nothing about which view of it this is — the tabs say that (ADR-0097 decision 3).
   The first crumb names the tree, `nodes`: what its first level holds is the
   deployment's to choose, so the crumb names the kind of thing rather than any of
   them. Each crumb opens the same view of that ancestor — the Status view, the
   Series view, the History page, the Copy page — and `nodes` that view's root, which
   for History is the overview and for Copy the tree's document (ADR-0115 decision
   7). The current node (last crumb) is plain text. One flex item, on one
   line with the node's title beside it while the band has the room. Where it has
   not — a deep path on a phone — the trail takes as many lines as it needs
   (`.ls-crumbs`), each ending in its slash: the space before a slash does not break,
   the one after it does. Expects `branch` in context (the node's url-branch path),
   and `view` on a page that is one. #}
{%- set crumb_view = view | default('status') -%}
{%- macro crumb_href(path) -%}
    {%- if crumb_view == 'series' -%}
        {#- A Series crumb carries the window the view is drawn over (ADR-0098
            decision 2); the index takes none. -#}
        {{- url_for('series', path=path, **(window_args | default({}))) if path
            else url_for('series_index') -}}
    {%- elif crumb_view == 'history' -%}
        {{- url_for('history', path=path) if path else url_for('status') -}}
    {%- elif crumb_view == 'copy' -%}
        {{- url_for('copy', branch=path) if path else url_for('copy') -}}
    {%- else -%}
        {{- url_for('status', branch=path) if path else url_for('status') -}}
    {%- endif -%}
{%- endmacro -%}
<span class="ls-crumbs">
    {%- if branch %}
    <a href="{{ crumb_href('') }}" class="text-decoration-none text-reset crumb">nodes</a>
    {%- else %}
    <span class="text-muted">nodes</span>
    {%- endif %}
    {%- for name, path in branch | breadcrumbs -%}
        <span class="text-muted">&nbsp;/ </span>
        {%- if loop.last -%}
            <span class="text-muted">{{ name }}</span>
        {%- else -%}
            <a href="{{ crumb_href(path) }}" class="text-decoration-none text-reset crumb">{{ name }}</a>
        {%- endif -%}
    {%- endfor -%}
</span>