indexes section in the HTML repr

xarray/core/formatting.py

@@ -408,6 +408,15 @@ def coords_repr(coords, col_width=None, max_rows=None):
     )
 
 
+def inline_index_repr(index, max_width=None):
+    if hasattr(index, "_repr_inline_"):
+        repr_ = index._repr_inline_(max_width=max_width)
+    else:
+        repr_ = repr(index)
+
+    return repr_
+
+
 def summarize_index(
     name: Hashable, index, col_width: int, max_width: int = None, is_index: bool = False
 ):

xarray/core/formatting_html.py

@@ -6,7 +6,7 @@
 from html import escape
 from importlib.resources import read_binary
 
-from .formatting import inline_variable_array_repr, short_data_repr
+from .formatting import inline_index_repr, inline_variable_array_repr, short_data_repr
 from .options import _get_boolean_with_default
 
 STATIC_FILES = (
@@ -125,6 +125,40 @@ def summarize_vars(variables):
     return f"<ul class='xr-var-list'>{vars_li}</ul>"
 
 
+def short_index_repr_html(index):
+    if hasattr(index, "_repr_html_"):
+        return index._repr_html_()
+
+    return f"<pre>{escape(repr(index))}</pre>"
+
+
+def summarize_index(coord_names, index):
+    name = "<br>".join([escape(str(n)) for n in coord_names])
+
+    index_id = f"index-{uuid.uuid4()}"
+    preview = escape(inline_index_repr(index))
+    details = short_index_repr_html(index)
+
+    data_icon = _icon("icon-database")
+
+    return (
+        f"<div class='xr-index-name'><div>{name}</div></div>"
+        f"<div class='xr-index-preview xr-preview'>{preview}</div>"
+        f"<div></div>"
+        f"<input id='{index_id}' class='xr-index-data-in' type='checkbox'/>"
+        f"<label for='{index_id}' title='Show/Hide index repr'>{data_icon}</label>"
+        f"<div class='xr-index-data'>{details}</div>"
+    )
+
+
+def summarize_indexes(indexes):
+    indexes_li = "".join(
+        f"<li class='xr-var-item'>{summarize_index(v, i)}</li>"
+        for v, i in indexes.items()
+    )
+    return f"<ul class='xr-var-list'>{indexes_li}</ul>"
+
+
 def collapsible_section(
     name, inline_details="", details="", n_items=None, enabled=True, collapsed=False
 ):
@@ -213,6 +247,13 @@ def array_section(obj):
     expand_option_name="display_expand_data_vars",
 )
 
+index_section = partial(
+    _mapping_section,
+    name="Indexes",
+    details_func=summarize_indexes,
+    max_items_collapse=15,
+    expand_option_name="display_expand_indexes",
+)
 
 attr_section = partial(
     _mapping_section,
@@ -223,6 +264,14 @@ def array_section(obj):
 )
 
 
+def _get_indexes_dict(indexes):
+    idx_dict = {}
+    for idx, index_vars in indexes.group_by_index():
+        idx_dict[tuple(index_vars)] = idx
+
+    return idx_dict
+
+
 def _obj_repr(obj, header_components, sections):
     """Return HTML repr of an xarray object.
 
@@ -280,6 +329,7 @@ def dataset_repr(ds):
         dim_section(ds),
         coord_section(ds.coords),
         datavar_section(ds.data_vars),
+        index_section(_get_indexes_dict(ds.xindexes)),
         attr_section(ds.attrs),
     ]
 

xarray/core/indexes.py

@@ -133,6 +133,9 @@ def _copy(self, deep: bool = True, memo: dict[int, Any] | None = None) -> Index:
     def __getitem__(self, indexer: Any):
         raise NotImplementedError()
 
+    def _repr_inline_(self, max_width):
+        return self.__class__.__name__
+
 
 def _maybe_cast_to_cftimeindex(index: pd.Index) -> pd.Index:
     from ..coding.cftimeindex import CFTimeIndex

xarray/static/css/style.css

@@ -244,6 +244,10 @@ body.vscode-dark {
   grid-column: 4;
 }
 
+.xr-index-preview {
+  grid-column: 2 / 5;
+}
+
 .xr-var-name,
 .xr-var-dims,
 .xr-var-dtype,
@@ -265,14 +269,16 @@ body.vscode-dark {
 }
 
 .xr-var-attrs,
-.xr-var-data {
+.xr-var-data,
+.xr-index-data {
   display: none;
   background-color: var(--xr-background-color) !important;
   padding-bottom: 5px !important;
 }
 
 .xr-var-attrs-in:checked ~ .xr-var-attrs,
-.xr-var-data-in:checked ~ .xr-var-data {
+.xr-var-data-in:checked ~ .xr-var-data,
+.xr-index-data-in:checked ~ .xr-index-data {
   display: block;
 }
 
@@ -282,13 +288,16 @@ body.vscode-dark {
 
 .xr-var-name span,
 .xr-var-data,
+.xr-index-name div,
+.xr-index-data,
 .xr-attrs {
   padding-left: 25px !important;
 }
 
 .xr-attrs,
 .xr-var-attrs,
-.xr-var-data {
+.xr-var-data,
+.xr-index-data {
   grid-column: 1 / -1;
 }
 
@@ -326,7 +335,8 @@ dl.xr-attrs {
 }
 
 .xr-icon-database,
-.xr-icon-file-text2 {
+.xr-icon-file-text2,
+.xr-no-icon {
   display: inline-block;
   vertical-align: middle;
   width: 1em;