205 lines
4.2 KiB
D
205 lines
4.2 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 std.string;
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import std.stdio;
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import std.typecons;
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import core.sys.posix.unistd;
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import core.stdc.string;
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import core.stdc.errno;
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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 stat_t _sourceStat;
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private string[][string] _tagCache;
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private string[][string] _dirCache;
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private string[] _tagList;
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private string[string] _fileLinkCache;
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private bool _noCommon;
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enum exclusionChar = '!';
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this(string source, TagProvider[] tagProviders, bool noCommon)
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{
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_source = source;
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_tagProviders = tagProviders;
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_noCommon = noCommon;
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lstat(toStringz(source), &_sourceStat);
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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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auto tags = tagProvider.getTags(file);
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_tagCache[file] ~= tags.map!(tag => tag.replace("/", "/")).array; //replace '/' (directory separator) with full-width solidus
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_fileLinkCache[file.baseName] = file;
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}
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}
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_tagList = _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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override void getattr(const(char)[] path, ref stat_t stat)
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{
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stat.st_uid = _sourceStat.st_uid;
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stat.st_gid = _sourceStat.st_gid;
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//excluded tags are also valid directories
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if(path == "/" || isTag(path.baseName.stripLeft(exclusionChar)))
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{
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stat.st_mode = _sourceStat.st_mode;
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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_IFLNK | octal!777;
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stat.st_nlink = 1;
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}
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else
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{
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throw new FuseException(ENOENT);
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}
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}
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bool isTag(const(char)[] name)
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{
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return _tagList.canFind(name);
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}
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bool isFile(const(char)[] name)
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{
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return (name in _fileLinkCache) !is null;
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}
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string findFile(const(char)[] name)
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{
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if(!isFile(name))
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{
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return null;
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}
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return _fileLinkCache[name];
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}
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Tuple!(bool, "exclude", string, "name")[] pathToTagTuples(const(char)[] path)
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{
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//map the path to a range of tuples with an exclude (bool) and a name (string) field for each tag in the path
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return pathSplitter(path)
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.array[1..$]
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.map!(tag => tuple!("exclude", "name")(tag[0] == exclusionChar, cast(immutable)tag.stripLeft(exclusionChar)))
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.array;
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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 _tagList;
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}
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else
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{
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auto tags = pathToTagTuples(path);
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//filter pairs with tags that (should not be excluded && can be found) || (should be excluded && can't be found)
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auto filePairs = _tagCache.byKeyValue().filter!(a => tags.all!(b => !b.exclude == a.value.canFind(b.name)));
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return filePairs.map!(a => a.value)
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.joiner
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.filter!(a => !tags.map!(tag => tag.name).canFind(a)) //don't match tags that are already in the path
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.filter!(a => !_noCommon || !filePairs.all!(f => f.value.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 = pathToTagTuples(path);
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//filter files with tags that (should not be excluded && can be found) || (should be excluded && can't be found)
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return _tagCache.byKeyValue()
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.filter!(a => tags.all!(b => !b.exclude == a.value.canFind(b.name)))
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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 ulong readlink(const(char)[] path, ubyte[] buf)
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{
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auto realPath = findFile(path.baseName);
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if(realPath is null)
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{
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throw new FuseException(ENOENT);
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}
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strncpy(cast(char*)buf, cast(char*)realPath.toStringz, realPath.length);
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return realPath.length;
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}
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override bool access(const(char)[] path, int mode)
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{
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//TODO: Check if this should always be true
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return true;
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}
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override string[] readdir(const(char)[] path)
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{
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if(path in _dirCache)
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{
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return _dirCache[path];
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}
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if (path == "/")
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{
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return _dirCache[path] = getTags(path) ~ getFiles(path);
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}
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else
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{
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return _dirCache[path] = getTags(path) ~ getFiles(path) ~ [".", ".."];
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}
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}
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}
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