125 lines
2.2 KiB
D
125 lines
2.2 KiB
D
module dtagfs.filesystem;
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import std.algorithm;
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import std.range;
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import std.file;
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import std.conv;
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import std.path;
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import std.array;
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import dfuse.fuse;
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import dtagfs.tagprovider;
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class FileSystem : Operations
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{
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private string _source;
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private TagProvider[] _tagProviders;
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private string[][string] _tagCache;
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this(string source, TagProvider[] tagProviders)
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{
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_source = source;
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_tagProviders = tagProviders;
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cacheTags();
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}
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@property
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TagProvider primaryTagProvider()
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{
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return _tagProviders[0];
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}
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void cacheTags()
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{
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foreach(tagProvider; _tagProviders.filter!(a => a.cacheReads))
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{
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foreach(file; dirEntries(_source, SpanMode.breadth).filter!(a => a.isFile))
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{
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_tagCache[file] ~= tagProvider.getTags(file);
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}
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}
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}
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override void getattr(const(char)[] path, ref stat_t stat)
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{
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if(path == "/" || isTag(path.baseName))
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{
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stat.st_mode = S_IFDIR | octal!700;
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stat.st_size = 0;
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return;
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}
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else if(isFile(path.baseName))
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{
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stat.st_mode = S_IFREG | octal!700;
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stat.st_size = 42;
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return;
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}
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throw new FuseException(errno.ENOENT);
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}
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bool isTag(const(char)[] name)
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{
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return _tagCache.values.any!(a => a.canFind(name));
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}
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bool isFile(const(char)[] name)
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{
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return _tagCache.keys.any!(a => a.baseName == name);
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}
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string[] getTags(const(char)[] path)
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{
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if(path == "/")
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{
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return _tagCache.byValue()
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.joiner
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.array
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.sort()
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.uniq
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.array;
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}
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else
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{
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auto tags = pathSplitter(path).array[1..$];
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return _tagCache.byKeyValue()
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.filter!(a => tags.all!(b => a.value.canFind(b)))
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.map!(a => a.value)
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.joiner
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.filter!(a => !tags.canFind(a))
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.array
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.sort()
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.uniq
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.array;
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}
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}
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string[] getFiles(const(char)[] path)
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{
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if(path == "/")
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{
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return _tagCache.keys.map!(a => a.baseName).array;
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}
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else
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{
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auto tags = pathSplitter(path).array[1..$];
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return _tagCache.byKeyValue()
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.filter!(a => tags.all!(b => a.value.canFind(b)))
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.map!(a => a.key.baseName)
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.array;
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}
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}
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override string[] readdir(const(char)[] path)
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{
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//TODO: Don't return tags if only one file (or files with exactly the same set of tags) files?
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return getTags(path) ~ getFiles(path);
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}
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}
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