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File indexing completed on 2026-11-02 09:31:14

 import gzip
 import os
 import re
 
 import awkward as ak
 import click
 import numpy as np
 import uproot
 from bokeh.events import DocumentReady
 from bokeh.io import curdoc
 from bokeh.layouts import gridplot
 from bokeh.models import ColumnDataSource
 from bokeh.models import CustomJSExpr
 from bokeh.models import Range1d
 from bokeh.models import PrintfTickFormatter
 from bokeh.plotting import figure, output_file, save
 from hist import Hist
 from scipy.stats import PermutationMethod, anderson_ksamp, kstest
 
 from ..util import integer_axis_range, skip_common_prefix
 
 # Cap Anderson-Darling sample size to keep runtime bounded on
 # high-multiplicity collections.
 _AD_MAX_N = 10_000
 
 
 def _ad_rng(key):
     """Return a deterministic RNG seeded from the leaf key.
 
     Using a per-leaf seed (rather than a shared module-level RNG) makes each
     leaf's subsample independent of the number and order of previously
     processed leaves, so AD p-values stay reproducible when the set of
     processed collections changes (e.g. under different match/unmatch
     filters).
     """
     import hashlib
     digest = hashlib.blake2b(key.encode("utf-8"), digest_size=8).digest()
     return np.random.default_rng(int.from_bytes(digest, "little"))
 
 _MIDPOINT_EXPR_CODE = """
 const y1 = this.data.y1;
 const y2 = this.data.y2;
 return y1.map((v, i) => (v + y2[i]) / 2);
 """
 
 
 def _is_leaf(obj):
     """Check if an uproot branch/field object is a leaf (has no sub-branches/sub-fields).
 
     Supports both TTree TBranch objects (which use `.branches`) and
     RNTuple RField objects (which use `.fields`).
     """
     if hasattr(obj, 'branches'):
         return len(obj.branches) == 0
     if hasattr(obj, 'fields'):
         return len(obj.fields) == 0
     return True
 
 
 def _normalize_key(key):
     """Normalize uproot key format between TTree and RNTuple styles.
 
     TTree EDM4hep keys follow 'CollectionName/CollectionName.fieldPath' pattern.
     RNTuple EDM4hep keys follow 'CollectionName.fieldPath' pattern.
     This function converts TTree-style keys to the RNTuple-style format so that
     the same physics quantity has the same key regardless of the input file format.
 
     TTree keys for fixed-size array branches include a trailing '[N]' size
     annotation (e.g. 'covariance.covariance[21]') which is absent in RNTuple
     keys; this suffix is stripped so the two formats match.
 
     >>> _normalize_key('MCParticles/MCParticles.momentum.x')
     'MCParticles.momentum.x'
     >>> _normalize_key('MCParticles.momentum.x')
     'MCParticles.momentum.x'
     >>> _normalize_key('EventHeader/EventHeader.eventNumber')
     'EventHeader.eventNumber'
     >>> _normalize_key('CentralCKFTrackParameters/CentralCKFTrackParameters.covariance.covariance[21]')
     'CentralCKFTrackParameters.covariance.covariance'
     """
     if "/" in key:
         _, field_part = key.split("/", 1)
     else:
         field_part = key
     return re.sub(r'\[\d+\]$', '', field_part)
 
 
 def match_filter(key, match, unmatch):
     accept = True
     if match:
         accept = False
         for regex in match:
             if regex.match(key):
                 accept = True
     for regex in unmatch:
         if regex.match(key):
             accept = False
     return accept
 
 
 @click.command()
 @click.argument("files", type=click.File('rb'), nargs=-1)
 @click.option(
     "-m", "--match", multiple=True,
     help="Only include collections with names matching a regex"
 )
 @click.option(
     "-M", "--unmatch", multiple=True,
     help="Exclude collections with names matching a regex"
 )
 @click.option(
     "--serve", is_flag=True,
     default=False,
     help="Run a local HTTP server to view the report"
 )
 def bara(files, match, unmatch, serve):
     arr = {}
 
     match = list(map(re.compile, match))
     unmatch = list(map(re.compile, unmatch))
 
     for _file in files:
         tree = uproot.open(_file)["events"]
 
         sort_by_evtnum = None
         for evtnum_key in ["EventHeader/EventHeader.eventNumber", "EventHeader.eventNumber"]:
             if evtnum_key in tree.keys(recursive=True):
                 evtnum = tree[evtnum_key].array()
                 sort_by_evtnum = ak.argsort(ak.flatten(evtnum))
                 break
 
         for key in tree.keys(recursive=True):
             if not key.startswith("PARAMETERS") and _is_leaf(tree[key]):
                 normalized = _normalize_key(key)
                 if match_filter(normalized, match, unmatch):
                     val = tree[key].array()
                     if sort_by_evtnum is not None:
                         val = val[sort_by_evtnum]
                     arr.setdefault(normalized, {})[_file] = val
 
     paths = skip_common_prefix([_file.name.split("/") for _file in files])
     paths = skip_common_prefix([reversed(list(path)) for path in paths])
     labels = ["/".join(reversed(list(reversed_path))) for reversed_path in paths]
 
     collection_figs = {}
     collection_with_diffs = {}
     collection_ks_pvalue = {}
     collection_ad_pvalue = {}
     collection_matching_count = {}
     collection_step_exprs = {}
 
     for key in sorted(arr.keys()):
         if any("string" in str(ak.type(a)) for a in arr[key].values()):
             click.echo(f"String value detected for key \"{key}\". Skipping...")
             continue
         if any("bool" in str(ak.type(a)) for a in arr[key].values()):
             click.echo(f"Bool value detected for key \"{key}\". Skipping...")
             continue
         if any(a.layout.minmax_depth[0] < 2 for a in arr[key].values()):
             # Not possible for PODIO, here for general ROOT file support
             print(f"Skipping non-array branch \"{key}\"")
             continue
 
         x_min = min(filter(
             lambda v: v is not None,
             map(lambda a: ak.min(ak.mask(a, np.isfinite(a))), arr[key].values())
         ), default=None)
         if x_min is None:
             continue
         nbins = 10
 
         if (any("* uint" in str(ak.type(a)) for a in arr[key].values())
            or any("* int" in str(ak.type(a)) for a in arr[key].values())):
             x_max = max(filter(
                 lambda v: v is not None,
                 map(lambda a: ak.max(ak.mask(a, np.isfinite(a))), arr[key].values())
             ), default=None)
             x_range = integer_axis_range(x_min, x_max)
             nbins = int(min(100, x_range))
         else:
             x_range = max(filter(
                 lambda v: v is not None,
                 map(lambda a: ak.max(ak.mask(a - x_min, np.isfinite(a))), arr[key].values())
             ), default=None)
             x_range = x_range * 1.1
 
         if x_range == 0:
             x_range = 1
 
         if "." in key:
             branch_name = key.split(".", 1)[0]
             leaf_name = key
         else:
             branch_name = key
             leaf_name = key
 
         midpoint_expr = collection_step_exprs.setdefault(
             branch_name,
             CustomJSExpr(code=_MIDPOINT_EXPR_CODE),
         )
         fig = figure(x_axis_label=leaf_name, y_axis_label="Entries")
         if x_range < 1.:
             fig.xaxis.formatter = PrintfTickFormatter(format="%.2g")
         collection_figs.setdefault(branch_name, []).append(fig)
         y_max = 0
 
         prev_file_arr = None
         vis_params = [
           ("green", 1.5, "solid", " "),
           ("red", 3, "dashed", ","),
           ("blue", 2, "dotted", "."),
         ]
 
         leaf_min_pvalue = 1.0
         if set(arr[key].keys()) != set(files):
             # not every file has the key
             collection_with_diffs[branch_name] = 0.0
             leaf_min_pvalue = 0.0
 
         for _file, label, (color, line_width, line_dash, hatch_pattern) in zip(files, labels, vis_params):
             if _file not in arr[key]:
                 continue
             file_arr = arr[key][_file]
 
             # diff, KS and Anderson-Darling k-sample tests
             pvalue = None
             ks_pvalue = None
             ad_pvalue = None
             if prev_file_arr is not None:
                 if ((ak.num(file_arr, axis=0) != ak.num(prev_file_arr, axis=0))
                    or ak.any(ak.num(file_arr, axis=1)
                              != ak.num(prev_file_arr, axis=1))
                    or ak.any(ak.nan_to_none(file_arr)
                              != ak.nan_to_none(prev_file_arr))):
                     if (ak.num(ak.flatten(file_arr, axis=None), axis=0) > 0 and
                         ak.num(ak.flatten(prev_file_arr, axis=None), axis=0) > 0):
                         # We can only apply the tests on non-empty arrays
                         flat_a = ak.to_numpy(ak.flatten(file_arr, axis=None))
                         flat_b = ak.to_numpy(ak.flatten(prev_file_arr, axis=None))
                         # Fast path: identical flattened contents
                         if (flat_a.shape == flat_b.shape
                                 and np.array_equal(flat_a, flat_b)):
                             ks_pvalue = 1.0
                             ad_pvalue = 1.0
                         else:
                             ks_pvalue = kstest(flat_a, flat_b).pvalue
                             # AD cost grows ~linearly with sample size and
                             # dominates the total runtime for high-multiplicity
                             # collections. Subsample above _AD_MAX_N per side:
                             # AD at N=1e4 already resolves p-values well below
                             # any threshold we colour on, so larger samples buy
                             # no useful sensitivity.
                             rng = _ad_rng(key)
                             ad_a, ad_b = flat_a, flat_b
                             if len(ad_a) > _AD_MAX_N:
                                 ad_a = rng.choice(ad_a, _AD_MAX_N, replace=False)
                             if len(ad_b) > _AD_MAX_N:
                                 ad_b = rng.choice(ad_b, _AD_MAX_N, replace=False)
                             try:
                                 # anderson_ksamp fails if all samples are
                                 # identical or if there are too few distinct
                                 # values.
                                 ad_result = anderson_ksamp(
                                     [ad_a, ad_b],
                                     # n_resamples sets p-value resolution;
                                     # batch bounds peak memory (permutations
                                     # are otherwise materialized all at once,
                                     # which OOMs on large samples).
                                     # Seed the permutation RNG from the same
                                     # per-key stream used for subsampling so
                                     # the reported p-value is reproducible.
                                     method=PermutationMethod(n_resamples=999, batch=200, rng=rng),
                                     variant="midrank",
                                 )
                                 ad_pvalue = float(ad_result.pvalue)
                             except (ValueError, TypeError):
                                 ad_pvalue = None
                         if ad_pvalue is None:
                             pvalue = ks_pvalue
                         else:
                             pvalue = min(ks_pvalue, ad_pvalue)
                     else:
                         ks_pvalue = 0
                         ad_pvalue = 0
                         pvalue = 0
                     print(key)
                     print(f"p_KS = {ks_pvalue:.3f}",
                           f"p_AD = {ad_pvalue:.3f}" if ad_pvalue is not None else "p_AD = n/a")
                     print(prev_file_arr)
                     print(file_arr)
                     collection_with_diffs[branch_name] = min(pvalue, collection_with_diffs.get(branch_name, 1.))
                     collection_ks_pvalue[branch_name] = min(ks_pvalue, collection_ks_pvalue.get(branch_name, 1.))
                     if ad_pvalue is not None:
                         collection_ad_pvalue[branch_name] = min(ad_pvalue, collection_ad_pvalue.get(branch_name, 1.))
                     leaf_min_pvalue = min(leaf_min_pvalue, pvalue)
 
             # Figure
             h = (
                 Hist.new
                 .Reg(nbins, 0, x_range, name="x", label=key)
                 .Int64()
             )
             h.fill(x=ak.flatten(file_arr - x_min, axis=None))
 
             ys, edges = h.to_numpy()
             y0 = np.concatenate([ys, [ys[-1]]])
             legend_parts = [label]
             if ks_pvalue is not None:
                 legend_parts.append(f"{100*ks_pvalue:.0f}%CL KS")
             if ad_pvalue is not None:
                 legend_parts.append(f"{100*ad_pvalue:.0f}%CL AD")
             legend_label = "\n".join(legend_parts)
             source = ColumnDataSource(
                 {
                     "x": edges + x_min,
                     "y1": y0 - np.sqrt(y0),
                     "y2": y0 + np.sqrt(y0),
                 }
             )
             step_r = fig.step(
                 x="x",
                 y={"expr": midpoint_expr},
                 mode="after",
                 source=source,
                 legend_label=legend_label,
                 line_color=color,
                 line_width=line_width,
                 line_dash=line_dash,
             )
             step_r.nonselection_glyph = step_r.glyph
             varea_r = fig.varea_step(
                 x="x",
                 y1="y1",
                 y2="y2",
                 step_mode="after",
                 source=source,
                 legend_label=legend_label,
                 fill_color=color if hatch_pattern == " " else None,
                 fill_alpha=0.25,
                 hatch_color=color,
                 hatch_alpha=0.5,
                 hatch_pattern=hatch_pattern,
             )
             varea_r.nonselection_glyph = varea_r.glyph
             fig.legend.background_fill_alpha = 0.5 # make legend more transparent
             fig.legend.location = "top_left" # left-align so glyph markers stay inside the canvas
 
             y_max = max(y_max, np.max(y0 + np.sqrt(y0)))
             prev_file_arr = file_arr
 
         if leaf_min_pvalue == 1.0:
             collection_matching_count[branch_name] = collection_matching_count.get(branch_name, 0) + 1
 
         x_bounds = (x_min - 0.05 * x_range, x_min + 1.05 * x_range)
         y_bounds = (- 0.05 * y_max, 1.05 * y_max)
         # Set y range for histograms
         if np.all(np.isfinite(x_bounds)):
             try:
                 fig.x_range = Range1d(
                     *x_bounds,
                     bounds=x_bounds)
             except ValueError as e:
                 click.secho(str(e), fg="red", err=True)
         else:
             click.secho(f"overflow while calculating x bounds for \"{key}\"", fg="red", err=True)
         if np.all(np.isfinite(y_bounds)):
             try:
                 fig.y_range = Range1d(
                     *y_bounds,
                     bounds=y_bounds)
             except ValueError as e:
                 click.secho(str(e), fg="red", err=True)
         else:
             click.secho(f"overflow while calculating y bounds for \"{key}\"", fg="red", err=True)
 
     def to_filename(branch_name):
         return branch_name.replace("#", "__pound__").replace("/", "__underscore__")
 
     def option_key(item):
         collection_name, figs = item
         key = ""
         if collection_name in collection_with_diffs:
             if collection_with_diffs[collection_name] > 0.99:
                 key += " 0.99"
             elif collection_with_diffs[collection_name] > 0.95:
                 key += " 0.95"
             elif collection_with_diffs[collection_name] > 0.67:
                 key += " 0.67"
             else:
                 key += " 0.00"
         key += collection_name.lstrip("_")
         return key
 
     options = [("", "")]
     for collection_name, figs in sorted(collection_figs.items(), key=option_key):
         marker = ""
         if collection_name in collection_with_diffs:
             if collection_with_diffs[collection_name] > 0.99:
                 marker = " (*)"
             elif collection_with_diffs[collection_name] > 0.95:
                 marker = " (**)"
             elif collection_with_diffs[collection_name] > 0.67:
                 marker = " (***)"
             else:
                 marker = " (****)"
         options.append((to_filename(collection_name), collection_name + marker))
 
     from bokeh.models import CustomJS, Select, DataTable, TableColumn, HTMLTemplateFormatter, NumberFormatter, StringFormatter
     from bokeh.models.comparisons import CustomJSCompare
 
     # BokehJS creates the comparator as new Function("x", "y", ..., code),
     # so the cell values are available as `x` and `y` in the snippet.
     _ks_sorter = CustomJSCompare(code="""
         if (x === '' && y === '') return 0;
         if (x === '') return 1;
         if (y === '') return -1;
         const nx = parseFloat(x), ny = parseFloat(y);
         return nx < ny ? -1 : nx > ny ? 1 : 0;
     """)
 
     _ad_sorter = CustomJSCompare(code="""
         if (x === '' && y === '') return 0;
         if (x === '') return 1;
         if (y === '') return -1;
         if (x === 'n/a' && y === 'n/a') return 0;
         if (x === 'n/a') return 1;
         if (y === 'n/a') return -1;
         const nx = parseFloat(x), ny = parseFloat(y);
         return nx < ny ? -1 : nx > ny ? 1 : 0;
     """)
 
     def mk_summary_table():
         rows = []
         for collection_name, figs in sorted(
             collection_figs.items(),
             key=lambda item: item[0].lstrip("_"),
         ):
             if collection_name in collection_with_diffs:
                 pvalue = collection_with_diffs[collection_name]
                 if pvalue > 0.99:
                     color = "#28a745"  # green
                 elif pvalue > 0.95:
                     color = "#ffc107"  # yellow
                 elif pvalue > 0.67:
                     color = "#fd7e14"  # orange
                 else:
                     color = "#dc3545"  # red
                 ks_str = (f"{collection_ks_pvalue[collection_name]:.3f}"
                           if collection_name in collection_ks_pvalue else "")
                 ad_str = (f"{collection_ad_pvalue[collection_name]:.3f}"
                           if collection_name in collection_ad_pvalue else "n/a")
             else:
                 color = "transparent"
                 ks_str = ""
                 ad_str = ""
             n_total = len(figs)
             n_match = collection_matching_count.get(collection_name, 0)
             n_diff = n_total - n_match
             rows.append((collection_name, color, ks_str, ad_str, n_match, n_diff, n_total))
 
         source = ColumnDataSource({
             "collection": [r[0] for r in rows],
             "filename":   [to_filename(r[0]) for r in rows],
             "color":      [r[1] for r in rows],
             "ks_pvalue":  [r[2] for r in rows],
             "ad_pvalue":  [r[3] for r in rows],
             "nmatch":     [r[4] for r in rows],
             "ndiff":      [r[5] for r in rows],
             "nplots":     [r[6] for r in rows],
         })
         square_style = (
             'display:inline-block;width:0.9em;height:0.9em;'
             'margin-right:6px;vertical-align:middle;'
             'border:1px solid #999;background-color:<%= color %>;'
         )
         link_fmt = HTMLTemplateFormatter(
             template=f'<span style="{square_style}"></span>'
                      '<a href="#<%= filename %>"><%= value %></a>'
         )
         right_str = StringFormatter(text_align="right")
         right_num = NumberFormatter(text_align="right")
         columns = [
             TableColumn(field="collection", title="Collection", formatter=link_fmt, width=500),
             TableColumn(field="ks_pvalue", title="min KS p-value", formatter=right_str, width=120, sorter=_ks_sorter),
             TableColumn(field="ad_pvalue", title="min AD p-value", formatter=right_str, width=120, sorter=_ad_sorter),
             TableColumn(field="nmatch", title="# matching", formatter=right_num, width=80),
             TableColumn(field="ndiff", title="# differing", formatter=right_num, width=80),
             TableColumn(field="nplots", title="# plots", formatter=right_num, width=80),
         ]
         table = DataTable(
             source=source,
             columns=columns,
             width=800,
             sizing_mode="stretch_height",
             index_position=None,
             sortable=True,
             selectable=True,
             name="summary_table",
         )
         source.selected.js_on_change("indices", CustomJS(args={"source": source}, code="""
           const idx = cb_obj.indices;
           if (idx.length > 0) {
             // Meta/ctrl/shift-click is meant to open the row's link in a new
             // tab; don't also navigate this tab via the row-selection handler.
             if (window._lastClickModified) {
               source.selected.indices = [];
               return;
             }
             const filename = source.data["filename"][idx[0]];
             window.location.hash = "#" + filename;
             fetchAndReplaceBokehDocument(filename);
           }
         """))
         return table
 
     def mk_dropdown(value=""):
         dropdown = Select(title="Select branch (**** < 67% CL, ..., * > 99% CL stat. equiv.):", value=value, options=options)
         dropdown.js_on_change("value", CustomJS(code="""
           console.log('dropdown: ' + this.value, this.toString())
           if (this.value != "") {
             window.location.hash = "#" + this.value;
             fetchAndReplaceBokehDocument(this.value);
           } else {
             // Empty option selected: navigate back to the index page.
             window.location.hash = "";
           }
         """))
         return dropdown
 
     def mk_dropdown_minimal(value=""):
         # Embed only the currently selected option; the full list is stored once
         # in index.html's JavaScript and restored client-side after each load.
         # This avoids repeating a ~54 KB options list in every .json.gz file.
         label = next((lbl for val, lbl in options if val == value), value)
         minimal_options = [("", "")] + ([(value, label)] if value else [])
         dropdown = Select(title="Select branch (**** < 67% CL, ..., * > 99% CL stat. equiv.):", value=value, options=minimal_options)
         dropdown.js_on_change("value", CustomJS(code="""
           console.log('dropdown: ' + this.value, this.toString())
           if (this.value != "") {
             window.location.hash = "#" + this.value;
             fetchAndReplaceBokehDocument(this.value);
           } else {
             // Empty option selected: navigate back to the index page.
             window.location.hash = "";
           }
         """))
         return dropdown
 
     from bokeh.layouts import column
     from bokeh.embed import json_item
     import json
 
     os.makedirs("capybara-reports", exist_ok=True)
 
     for collection_name, figs in collection_figs.items():
         item = column(
           mk_dropdown_minimal(collection_name),
           gridplot(figs, ncols=3, width=400, height=300),
         )
 
         with gzip.open(f"capybara-reports/{to_filename(collection_name)}.json.gz", "wt") as fp:
             json.dump(json_item(item), fp, separators=(',', ':'))
 
     curdoc().js_on_event(DocumentReady, CustomJS(args={"all_options": options}, code="""
       window._bokehSelectOptions = all_options;
 
       // Record whether a modifier key was held for the most recent click so the
       // table row-selection handler can tell a plain click (navigate this tab)
       // from a meta/ctrl/shift-click (open the link in a new tab only).
       document.addEventListener('mousedown', function(e) {
         window._lastClickModified = e.metaKey || e.ctrlKey || e.shiftKey;
       }, true);
 
       function fetchAndReplaceBokehDocument(location) {
         fetch(location + '.json.gz')
           .then(async function(response) {
             if (!response.ok) {
                 throw new Error('Network response was not ok');
             }
 
             const ds = new DecompressionStream('gzip');
             const decompressedStream = response.body.pipeThrough(ds);
             const decompressedResponse = new Response(decompressedStream);
             const item = await decompressedResponse.json();
 
             Bokeh.documents[0].replace_with_json(item.doc);
 
             // Restore the full options list to the newly loaded Select widget.
             for (const [, model] of Bokeh.documents[0]._all_models) {
               if (model.options instanceof Array) {
                 model.options = window._bokehSelectOptions;
                 model.value = location;
                 break;
               }
             }
           })
           .catch(function(error) {
             console.error('Fetch or decompression failed:', error);
           });
       }
 
       // The hash encodes both the current page and the index table's sort state
       // as "#<filename>?sort=<field>:<asc|desc>;...". Keeping the sort in the
       // hash lets it survive the full-page reload that happens when navigating
       // back to the (regenerated) index page.
       function parseHash() {
         var raw = window.location.hash.replace(/^#/, "");
         var qi = raw.indexOf("?");
         if (qi < 0) {
           return { location: raw, query: "" };
         }
         return { location: raw.slice(0, qi), query: raw.slice(qi + 1) };
       }
 
       function parseSort(query) {
         var s = new URLSearchParams(query).get("sort");
         if (!s) {
           return [];
         }
         return s.split(";").map(function(tok) {
           var parts = tok.split(":");
           return { field: parts[0], sortAsc: parts[1] !== "desc" };
         }).filter(function(c) { return c.field; });
       }
 
       function encodeSort(cols) {
         if (!cols || cols.length === 0) {
           return "";
         }
         return cols.map(function(c) {
           return c.field + ":" + (c.sortAsc ? "asc" : "desc");
         }).join(";");
       }
 
       // Set or clear a single parameter of the hash query, keeping the current
       // page and the other parameters intact. Uses replaceState so that
       // re-sorting/scrolling does not pile up history entries.
       function updateHashParam(key, value) {
         var h = parseHash();
         var params = new URLSearchParams(h.query);
         if (value === null || value === "") {
           params.delete(key);
         } else {
           params.set(key, value);
         }
         var q = params.toString();
         history.replaceState(null, "", "#" + h.location + (q ? "?" + q : ""));
       }
 
       function getSummaryTableView() {
         try {
           return Bokeh.index.query_one(function(v) {
             return v.model && v.model.name === "summary_table" && v.grid != null;
           });
         } catch (e) {
           return null;
         }
       }
 
       function applySortToTable(cols, attempt) {
         attempt = attempt || 0;
         var view = getSummaryTableView();
         if (view == null) {
           if (attempt < 40) {
             setTimeout(function() { applySortToTable(cols, attempt + 1); }, 50);
           }
           return;
         }
         var byField = {};
         view.grid.getColumns().forEach(function(gc) { byField[gc.field] = gc; });
         var slickSort = [], dataSort = [];
         cols.forEach(function(c) {
           var gc = byField[c.field];
           if (gc) {
             slickSort.push({ columnId: gc.id, sortAsc: c.sortAsc });
             dataSort.push({ sortCol: gc, sortAsc: c.sortAsc });
           }
         });
         view.grid.setSortColumns(slickSort);
         view.data.sort(dataSort);
         view.grid.invalidate();
         view.grid.render();
         view.model.update_sort_columns(dataSort);
       }
 
       function setupSortPersistence(attempt) {
         attempt = attempt || 0;
         var view = getSummaryTableView();
         if (view == null) {
           if (attempt < 40) {
             setTimeout(function() { setupSortPersistence(attempt + 1); }, 50);
           }
           return;
         }
         var query = parseHash().query;
         var initial = parseSort(query);
         if (initial.length > 0) {
           applySortToTable(initial);
         }
         view.grid.onSort.subscribe(function(_event, args) {
           var cols = (args.sortCols || []).map(function(sc) {
             return { field: sc.sortCol.field, sortAsc: sc.sortAsc };
           });
           updateHashParam("sort", encodeSort(cols) || null);
         });
 
         // The vertical scroll position lives in the SlickGrid viewport, which is
         // recreated (and reset) by the full-page reload on back navigation.
         // Persist it in the hash too so it survives the round trip.
         function viewport() {
           return view.shadow_el ? view.shadow_el.querySelector(".slick-viewport") : null;
         }
         var savedScroll = parseInt(new URLSearchParams(query).get("scroll") || "0", 10);
         if (savedScroll > 0) {
           setTimeout(function() {
             var vp = viewport();
             if (vp) { vp.scrollTop = savedScroll; }
           }, 150);
         }
         var scrollTimer = null;
         view.grid.onScroll.subscribe(function() {
           if (scrollTimer) { clearTimeout(scrollTimer); }
           scrollTimer = setTimeout(function() {
             // Guard against a late-firing timer writing to a collection page's
             // hash if the user navigated away right after scrolling.
             if (parseHash().location !== "") { return; }
             var vp = viewport();
             var y = vp ? Math.round(vp.scrollTop) : 0;
             updateHashParam("scroll", y > 0 ? String(y) : null);
           }, 150);
         });
       }
 
       window.onhashchange = function() {
         var location = parseHash().location;
         if (location == "") {
           // No page in the hash: return to the index page. Since there is no
           // index.json.gz, just reload the page to get a fresh index.html (the
           // sort is restored from the hash by setupSortPersistence).
           if (typeof window.current_location !== 'undefined') {
             window.location.reload();
           }
           return;
         }
         if ((typeof current_location === 'undefined') || (current_location != location)) {
           fetchAndReplaceBokehDocument(location);
           window.current_location = location;
         }
       }
       window.onhashchange();
       setupSortPersistence();
     """))
     output_file(filename="capybara-reports/index.html", title="ePIC capybara report")
     save(column(
         mk_dropdown(),
         mk_summary_table(),
         sizing_mode="stretch_height",
     ))
 
     if serve:
         os.chdir("capybara-reports/")
         from http.server import SimpleHTTPRequestHandler
         from socketserver import TCPServer
         with TCPServer(("127.0.0.1", 24535), SimpleHTTPRequestHandler) as httpd:
             print("Serving report at http://127.0.0.1:24535")
             try:
                 httpd.serve_forever()
             except KeyboardInterrupt:
                 pass

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