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Implement Iter(Dir) and each(Dir) #604

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Implement Iter(Dir) and each(Dir) #604

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31 changes: 31 additions & 0 deletions lib/autoload/globals/Iter.ngs
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Original file line number Diff line number Diff line change
Expand Up @@ -388,3 +388,34 @@ F skip(i:Iter, count:Int){
TEST [3, 4, 5, 34, 5].Iter().skip(3).Arr() == [34, 5]
TEST [3, 40, 15, 34, 5].Iter().skip(2).Arr() == [15, 34, 5]
TEST {[3, 40, 15, 34, 5].Iter().skip(10)}.assert(SkipError)

doc Type that allows us to iterate over a directory.
type DirIter(Iter)

# ---------- DirIter ----------
doc Calls DirIter constructor.
doc %RET - DirIter which allows us to iterate over a directory
F Iter(d:Dir) DirIter(d)

doc Initialize the DirIter with specific Dir
F init(i:DirIter, d:Dir) i.dir = c_opendir(d.path)

doc Check whether there are more paths to iterate over.
doc %RET - Bool. true: next() will return next element. false: next() will throw NoNext
F Bool(i:DirIter) {

}

doc Get next path of a directory iterated over.
doc %RET - Path
F next(d:DirIter) {
SKIP_DIRS = ['.', '..']
#throw_if_no_next(d)
ret = c_readdir(d.dir)
ret.d_name in SKIP_DIRS continues
ret
}

doc Calls cb with each path from the directory
doc %RET - i
F each(d:Dir, cb:Fun) DirIter(d).Iter().each(cb)