From bf351b8247da142213a5df3b0694a2c09584bceb Mon Sep 17 00:00:00 2001
From: Martin Fischer <martin@push-f.com>
Date: Sat, 27 Nov 2021 08:37:19 +0100
Subject: html: merge features

---
 build.py | 43 ++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 38 insertions(+), 5 deletions(-)

diff --git a/build.py b/build.py
index 2fd4c26..50c6a36 100755
--- a/build.py
+++ b/build.py
@@ -35,18 +35,51 @@ with open('target/data.json', 'w') as f:
     json.dump(dict(unstable=unstable_features, versions=versions), f)
 
 
-def write_features(f, features):
-    f.write('<ul>')
-    for feat, data in features.items():
-        f.write('<li><a')
+def write_features(f, feature_data):
+    features = {}
+    for feat, data in feature_data.items():
+        key = data['flag'] if 'flag' in data else feat
+        # caniuse.rs sometimes has several .toml files for one feature flag e.g.
+        # For the const_io feature flag it has 6 .toml files, all with the same
+        # tracking_issue_id and the following titles:
+        #
+        # * `io::Cursor::get_ref` as `const fn`
+        # * `io::Cursor::new` as `const fn`
+        # * `io::Cursor::position` as `const fn`
+        # * `io::empty` as `const fn`
+        # * `io::repeat` as `const fn`
+        # * `io::sink` as `const fn`
+        #
+        # That makes sense for a search-centric application.  Not so much for a
+        # static-site generator since showing the same link 6 times is confusing.
+
         url = None
-        # print(data)
         if 'tracking_issue_id' in data:
             url = 'https://github.com/rust-lang/rust/issues/{}'.format(
                 data['tracking_issue_id']
             )
         elif 'impl_pr_id' in data:
             url = 'https://github.com/rust-lang/rust/pull/{}'.format(data['impl_pr_id'])
+        data['url'] = url
+        data['filename'] = feat
+
+        if key in features and features[key]['url'] != url:
+            print(
+                'different urls for feature {}:\n* {}: {}\n* {}: {}'.format(
+                    key,
+                    data['filename'],
+                    data['url'],
+                    features[key]['filename'],
+                    features[key]['url'],
+                )
+            )
+
+        features[key] = data
+
+    f.write('<ul>')
+    for feat, data in features.items():
+        f.write('<li><a')
+        url = data['url']
         if url:
             f.write(f' href="{url}"')
 
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