67 lines
2.0 KiB
Fennel
67 lines
2.0 KiB
Fennel
(local inotify (require :inotify))
|
|
(local { : file-exists? : dirname } (require :anoia))
|
|
(local { : file-type : dir : mktree &as fs } (require :anoia.fs))
|
|
|
|
(fn read-line [name]
|
|
(with-open [f (assert (io.open name :r) (.. "can't open file " name))]
|
|
(f:read "*l")))
|
|
|
|
(fn watch-fsevents [directory-name]
|
|
(let [handle (inotify.init)]
|
|
(handle:addwatch directory-name
|
|
inotify.IN_CREATE
|
|
inotify.IN_MOVE
|
|
inotify.IN_DELETE
|
|
inotify.IN_DELETE_SELF
|
|
inotify.IN_MOVED_FROM
|
|
inotify.IN_MOVED_TO
|
|
inotify.IN_CLOSE_WRITE)
|
|
handle))
|
|
|
|
(fn write-value [pathname value]
|
|
(mktree (dirname pathname))
|
|
(match (type value)
|
|
"string"
|
|
(with-open [f (assert (io.open pathname :w) (.. "can't open " pathname))]
|
|
(f:write value))
|
|
"table" (each [k v (pairs value)]
|
|
(write-value (.. pathname "/" k) v))))
|
|
|
|
(fn read-value [pathname]
|
|
(case (file-type pathname)
|
|
nil nil
|
|
:directory
|
|
(collect [f (fs.dir pathname)]
|
|
(when (not (or (= f ".") (= f "..")))
|
|
(values f (read-value ( .. pathname "/" f)))))
|
|
:file
|
|
(read-line pathname)
|
|
:link
|
|
(read-line pathname)
|
|
unknown
|
|
(error (.. "can't read " pathname " of kind \"" unknown.mode "\""))))
|
|
|
|
(fn events [self]
|
|
(coroutine.wrap
|
|
#(while true
|
|
(while (not (self:ready?)) (self:wait))
|
|
(coroutine.yield self)
|
|
(self:wait))))
|
|
|
|
(fn open [directory]
|
|
(let [watcher (watch-fsevents directory)
|
|
has-file? (fn [filename] (file-exists? (.. directory "/" filename)))]
|
|
{
|
|
:wait #(watcher:read)
|
|
:ready? (fn [self]
|
|
(and (has-file? "state") (not (has-file? ".lock"))))
|
|
:output (fn [_ filename new-value]
|
|
(if new-value
|
|
(write-value (.. directory "/" filename) new-value)
|
|
(read-value (.. directory "/" filename))))
|
|
:close #(watcher:close)
|
|
: events
|
|
}))
|
|
|
|
{ : open }
|