blob: 67d6d5fa9f537365c7d601835574eff43f75b2ea (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
export default function getChronologyRelations(thing, {
contributions,
linkArtist,
linkThing,
getThings,
}) {
// One call to getChronologyRelations is considered "lumping" together all
// contributions as carrying equivalent meaning (for example, "artist"
// contributions and "contributor" contributions are bunched together in
// one call to getChronologyRelations, while "cover artist" contributions
// are a separate call). getChronologyRelations prevents duplicates that
// carry the same meaning by only using the first instance of each artist
// in the contributions array passed to it. It's expected that the string
// identifying which kind of contribution ("track" or "cover art") is
// shared and applied to all contributions, as providing them together
// in one call to getChronologyRelations implies they carry the same
// meaning.
const artistsSoFar = new Set();
contributions = contributions.filter(({who}) => {
if (artistsSoFar.has(who)) {
return false;
} else {
artistsSoFar.add(who);
return true;
}
});
return contributions.map(({who}) => {
const things = Array.from(new Set(getThings(who)));
// Don't show a line if this contribution isn't part of the artist's
// chronology at all (usually because this thing isn't dated).
const index = things.indexOf(thing);
if (index === -1) {
return;
}
// Don't show a line if this contribution is the *only* item in the
// artist's chronology (since there's nothing to navigate there).
const previous = things[index - 1];
const next = things[index + 1];
if (!previous && !next) {
return;
}
return {
index: index + 1,
artistLink: linkArtist(who),
previousLink: previous ? linkThing(previous) : null,
nextLink: next ? linkThing(next) : null,
};
}).filter(Boolean);
}
|
