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walkdir: iterates over contents of directory in pre- post- or breadth-first order #1765

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walkdir: iterates over contents of directory in pre- post- or breadth-first order #1765

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43 changes: 43 additions & 0 deletions base/file.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -317,3 +317,46 @@ end

readdir(cmd::Cmd) = readdir(string(cmd)[2:end-1])
readdir() = readdir(".")

# YouTests for this function available at https://gist.github.com/4294860
export walkdir
function walkdir(startdir, order)
function pre(dirname)
produce(dirname)
for filename in readdir(dirname)
fullname = file_path(dirname, filename)
if isdir(fullname)
pre(fullname)
else
produce(fullname)
end
end
end
function post(dirname)
for filename in readdir(dirname)
fullname = file_path(dirname, filename)
if isdir(fullname)
post(fullname)
else
produce(fullname)
end
end
produce(dirname)
end
function breadth(dirname)
q = {}
push(q, dirname)
produce(dirname)
while length(q) > 0
dirname = shift(q)
for filename in readdir(dirname)
fullname = file_path(dirname, filename)
if isdir(fullname) push(q, fullname) end
produce(fullname)
end
end
end
fn = {:pre => pre, :post => post, :breadth => breadth}[order]
@task fn(abs_path(startdir))
end
walkdir(startdir) = walkdir(startdir, :pre)