move inotify watcher to library

bin/moonc

@@ -194,49 +194,12 @@ local function create_watcher(files)
 		inotify = require "inotify"
 	end)
 
-	if inotify then
-		local dirs = {}
+	local watchers = require("moonscript.cmd.watchers")
 
-		for _, tuple in ipairs(files) do
-			local dir = parse_dir(tuple[1])
-			if dir == "" then
-				dir = "./"
-			end
-			table.insert(dirs, dir)
+	if watchers.InotifyWacher:available() then
+		return watchers.InotifyWacher(files):each_update()
 	end
 
-		dirs = remove_dups(dirs)
-
-		return coroutine.wrap(function()
-			io.stderr:write(("%s with inotify [%s]"):format(msg, plural(#dirs, "dir")) .. "\n")
-
-			local wd_table = {}
-			local handle = inotify.init()
-			for _, dir in ipairs(dirs) do
-				local wd = handle:addwatch(dir, inotify.IN_CLOSE_WRITE, inotify.IN_MOVED_TO)
-				wd_table[wd] = dir
-			end
-
-			while true do
-				local events = handle:read()
-				if not events then
-					break
-				end
-
-				for _, ev in ipairs(events) do
-					local fname = ev.name
-					if fname:match("%.moon$") then
-						local dir = wd_table[ev.wd]
-						if dir ~= "./" then
-							fname = dir .. fname
-						end
-						-- TODO: check to make sure the file was in the original set
-						coroutine.yield(fname)
-					end
-				end
-			end
-		end)
-	else
 	-- poll the filesystem instead
 	local sleep = get_sleep_func()
 	return coroutine.wrap(function()
@@ -264,7 +227,6 @@ local function create_watcher(files)
 		end
 	end)
 end
-end
 
 
 if opts.w then

moonscript/cmd/watcher.moon

@@ -1,29 +0,0 @@
-remove_dupes = (list, key_fn) ->
-  seen = {}
-  return for item in *list
-    key = if key_fn then key_fn item else item
-    continue if seen[key]
-    seen[key] = true
-    item
-
--- files is a list of tuples, {source, target}
-class Watcher
-  new: (@file_list) =>
-
-
-class InotifyWacher extends Watcher
-  @available: =>
-    pcall -> require "inotify"
-
-  get_dirs: =>
-    import parse_dir from require "moonscript.cmd.moonc"
-    dirs = for {file_path} in *@file_list
-      dir = parse_dir file_path
-      dir = "./" if dir == ""
-      dir
-
-    remove_dupes dirs
-
-class SleepWatcher
-
-{:Watcher, :SleepWatcher, :InotifyWacher}

moonscript/cmd/watchers.lua

@@ -31,10 +31,16 @@ remove_dupes = function(list, key_fn)
     return _accum_0
   end)()
 end
+local plural
+plural = function(count, word)
+  return tostring(count) .. " " .. tostring(word) .. tostring(count == 1 and "" or "s")
+end
 local Watcher
 do
   local _class_0
-  local _base_0 = { }
+  local _base_0 = {
+    start_msg = "Starting watch loop (Ctrl-C to exit)"
+  }
   _base_0.__index = _base_0
   _class_0 = setmetatable({
     __init = function(self, file_list)
@@ -81,6 +87,46 @@ do
         dirs = _accum_0
       end
       return remove_dupes(dirs)
+    end,
+    each_update = function(self)
+      return coroutine.wrap(function()
+        local dirs = self:get_dirs()
+        io.stderr:write(tostring(self.start_msg) .. " with inotify [" .. tostring(plural(#dirs, "dir")) .. "]\n")
+        local wd_table = { }
+        local inotify = require("inotify")
+        local handle = inotify.init()
+        for _index_0 = 1, #dirs do
+          local dir = dirs[_index_0]
+          local wd = handle:addwatch(dir, inotify.IN_CLOSE_WRITE, inotify.IN_MOVED_TO)
+          wd_table[wd] = dir
+        end
+        while true do
+          local events = handle:read()
+          if not (events) then
+            break
+          end
+          for _index_0 = 1, #events do
+            local _continue_0 = false
+            repeat
+              local ev = events[_index_0]
+              local fname = ev.name
+              if not (fname:match("%.moon$")) then
+                _continue_0 = true
+                break
+              end
+              local dir = wd_table[ev.wd]
+              if dir ~= "./" then
+                fname = dir .. fname
+              end
+              coroutine.yield(fname)
+              _continue_0 = true
+            until true
+            if not _continue_0 then
+              break
+            end
+          end
+        end
+      end)
     end
   }
   _base_0.__index = _base_0
@@ -125,14 +171,29 @@ end
 local SleepWatcher
 do
   local _class_0
+  local _parent_0 = Watcher
   local _base_0 = { }
   _base_0.__index = _base_0
+  setmetatable(_base_0, _parent_0.__base)
   _class_0 = setmetatable({
-    __init = function() end,
+    __init = function(self, ...)
+      return _class_0.__parent.__init(self, ...)
+    end,
     __base = _base_0,
-    __name = "SleepWatcher"
+    __name = "SleepWatcher",
+    __parent = _parent_0
   }, {
-    __index = _base_0,
+    __index = function(cls, name)
+      local val = rawget(_base_0, name)
+      if val == nil then
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
+      else
+        return val
+      end
+    end,
     __call = function(cls, ...)
       local _self_0 = setmetatable({}, _base_0)
       cls.__init(_self_0, ...)
@@ -140,6 +201,9 @@ do
     end
   })
   _base_0.__class = _class_0
+  if _parent_0.__inherited then
+    _parent_0.__inherited(_parent_0, _class_0)
+  end
   SleepWatcher = _class_0
 end
 return {

moonscript/cmd/watchers.moon

@@ -0,0 +1,61 @@
+remove_dupes = (list, key_fn) ->
+  seen = {}
+  return for item in *list
+    key = if key_fn then key_fn item else item
+    continue if seen[key]
+    seen[key] = true
+    item
+
+plural = (count, word) ->
+  "#{count} #{word}#{count == 1 and "" or "s"}"
+
+-- files is a list of tuples, {source, target}
+class Watcher
+  start_msg: "Starting watch loop (Ctrl-C to exit)"
+  new: (@file_list) =>
+
+class InotifyWacher extends Watcher
+  @available: =>
+    pcall -> require "inotify"
+
+  get_dirs: =>
+    import parse_dir from require "moonscript.cmd.moonc"
+    dirs = for {file_path} in *@file_list
+      dir = parse_dir file_path
+      dir = "./" if dir == ""
+      dir
+
+    remove_dupes dirs
+
+  -- creates an iterator that yields a file every time it's updated
+  -- TODO: detect when new files are added to directories
+  each_update: =>
+    coroutine.wrap ->
+      dirs = @get_dirs!
+
+      io.stderr\write "#{@start_msg} with inotify [#{plural #dirs, "dir"}]\n"
+      wd_table = {}
+
+      inotify = require "inotify"
+      handle = inotify.init!
+
+      for dir in *dirs
+        wd = handle\addwatch dir, inotify.IN_CLOSE_WRITE, inotify.IN_MOVED_TO
+        wd_table[wd] = dir
+
+      while true
+        events = handle\read!
+        break unless events -- error?
+
+        for ev in *events
+          fname = ev.name
+          continue unless fname\match "%.moon$"
+          dir = wd_table[ev.wd]
+          fname = dir .. fname if dir != "./"
+
+          -- TODO: check to make sure the file was in the original set
+          coroutine.yield(fname)
+
+class SleepWatcher extends Watcher
+
+{:Watcher, :SleepWatcher, :InotifyWacher}