50 lines
1.5 KiB
Fennel
50 lines
1.5 KiB
Fennel
(local inotify (require :inotify))
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(local { : file-exists? } (require :anoia))
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(local { : directory? } (require :anoia.fs))
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(local lfs (require :lfs))
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(fn read-line [name]
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(with-open [f (assert (io.open name :r) (.. "can't open file " name))]
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(f:read "*l")))
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(fn watch-fsevents [directory-name]
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(let [handle (inotify.init)]
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(handle:addwatch directory-name
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inotify.IN_CREATE
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inotify.IN_MOVE
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inotify.IN_DELETE
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inotify.IN_DELETE_SELF
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inotify.IN_MOVED_FROM
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inotify.IN_MOVED_TO
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inotify.IN_CLOSE_WRITE)
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handle))
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(fn read-value [pathname]
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(case (lfs.symlinkattributes pathname)
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nil nil
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{:mode "directory"}
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(collect [f (lfs.dir pathname)]
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(when (not (or (= f ".") (= f "..")))
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(values f (read-value ( .. pathname "/" f)))))
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{:mode "file"}
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(read-line pathname)
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{:mode "link"}
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(read-line pathname)
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unknown
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(error (.. "can't read " pathname " of kind \"" unknown.mode "\""))))
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(fn open [directory]
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(let [watcher (watch-fsevents directory)
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has-file? (fn [filename] (file-exists? (.. directory "/" filename)))]
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{
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:wait #(watcher:read)
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:ready? (fn [self]
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(and (has-file? "state") (not (has-file? ".lock"))))
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:output (fn [_ filename]
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(read-value (.. directory "/" filename)))
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:close #(watcher:close)
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}))
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{ : open }
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