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db/Interface: CollectUniqueTags() allows multiple "groups"

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Instead of passing tag and group, pass an array of tags.  To support a
nested return value, return a nested std::map of std::maps.  Each key
specifies the tag value, and each value may be another nesting level.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/408
This commit is contained in:
Max Kellermann
2018-11-19 11:17:25 +01:00
committed by Max Kellermann
parent 923c1b6220
commit 1eae9339f2
12 changed files with 166 additions and 123 deletions
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38
src/db/DatabasePrint.cxx
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@@ -1,5 +1,5 @@
/*
* Copyright 2003-2018 The Music Player Daemon Project
* Copyright 2003-2019 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
@@ -35,6 +35,7 @@
#include "Interface.hxx"
#include "fs/Traits.hxx"
#include "util/ChronoUtil.hxx"
#include "util/RecursiveMap.hxx"
#include <functional>
@@ -186,42 +187,29 @@ PrintSongUris(Response &r, Partition &partition,
}
static void
PrintUniqueTags(Response &r, TagType tag_type,
const std::set<std::string> &values)
PrintUniqueTags(Response &r, ConstBuffer<TagType> tag_types,
const RecursiveMap<std::string> &map) noexcept
{
const char *const name = tag_item_names[tag_type];
for (const auto &i : values)
r.Format("%s: %s\n", name, i.c_str());
}
const char *const name = tag_item_names[tag_types.front()];
tag_types.pop_front();
static void
PrintGroupedUniqueTags(Response &r, TagType tag_type, TagType group,
const std::map<std::string, std::set<std::string>> &groups)
{
if (group == TAG_NUM_OF_ITEM_TYPES) {
for (const auto &i : groups)
PrintUniqueTags(r, tag_type, i.second);
return;
}
for (const auto &i : map) {
r.Format("%s: %s\n", name, i.first.c_str());
const char *const group_name = tag_item_names[group];
for (const auto &i : groups) {
r.Format("%s: %s\n", group_name, i.first.c_str());
PrintUniqueTags(r, tag_type, i.second);
if (!tag_types.empty())
PrintUniqueTags(r, tag_types, i.second);
}
}
void
PrintUniqueTags(Response &r, Partition &partition,
TagType type, TagType group,
ConstBuffer<TagType> tag_types,
const SongFilter *filter)
{
assert(type < TAG_NUM_OF_ITEM_TYPES);
const Database &db = partition.GetDatabaseOrThrow();
const DatabaseSelection selection("", true, filter);
PrintGroupedUniqueTags(r, type, group,
db.CollectUniqueTags(selection, type, group));
PrintUniqueTags(r, tag_types,
db.CollectUniqueTags(selection, tag_types));
}