examples/limagemagic.lua

@@ -0,0 +1,121 @@
+----
+-- Auto "magic" image converter directory.
+-- 
+-- This lsycnd script will automatically convert all images that are placed
+-- in the directory 'magicdir' all resulting images are placed in the same
+-- directory!
+--
+-- Be sure to mkdir 'magicdir' first.
+--
+-- Fileformats:   .jpg  .gif  .png
+
+local formats = { jpg=true, gif=true, png=true,  }
+
+convert = {
+	delay = 0,
+
+	maxProcesses = 99,
+
+	action = function(inlet)
+		local event = inlet.getEvent()
+
+		if event.isdir then
+			-- ignores events on dirs
+			inlet.discardEvent(event)
+			return
+		end
+
+		-- extract extension and basefilename
+		local p    = event.pathname
+		local ext  = string.match(p, ".*%.([^.]+)$")
+		local base = string.match(p, "(.*)%.[^.]+$")
+		if not formats[ext] then
+			-- an unknown extenion
+			log("Normal", "not doing something on ."..ext)
+			inlet.discardEvent(event)
+			return
+		end
+
+		-- autoconvert on create and modify
+		if event.etype == "Create" or event.etype == "Modify" then
+			-- builds one bash command
+			local cmd = ""
+			-- do for all other extensions
+			for k, _ in pairs(formats) do
+				if k ~= ext then
+					-- excludes files to be created, so no
+					-- followup actions will occur
+					inlet.addExclude(base..'.'..k)
+					if cmd ~= ""  then
+						cmd = cmd .. " && "
+					end
+					cmd = cmd.. 
+						'/usr/bin/convert "'..
+						event.source..p..'" "'..
+						event.source..base..'.'..k..
+						'" || /bin/true'
+				end
+			end
+			log("Normal", "Converting "..p)
+			spawnShell(event, cmd)
+			return
+		end
+		
+		-- deletes all formats if you delete one
+		local p    = event.pathname
+		local ext  = string.match(p, ".*%.([^.]+)$")
+		local base = string.match(p, "(.*)%.[^.]+$")
+		if event.etype == "Delete" then
+			-- builds one bash command
+			local cmd = ""
+			-- do for all other extensions
+			for k, _ in pairs(formats) do
+				if k ~= ext then
+					-- excludes files to be created, so no
+					-- followup actions will occur
+					inlet.addExclude(base..'.'..k)
+					if cmd ~= ""  then
+						cmd = cmd .. " && "
+					end
+					cmd = cmd..
+						'rm "'..event.source..base..'.'..k..
+						'" || /bin/true'
+				end
+			end
+			log("Normal", "Deleting all "..p)
+			spawnShell(event, cmd)
+			return
+		end
+
+		-- ignores other events.
+		inlet.discardEvent(event)
+	end,
+
+	-----
+	-- Removes excludes when convertions are finished
+	--
+	collect = function(event, exitcode)
+		local p     = event.pathname
+		local ext   = string.match(p, ".*%.([^.]+)$")
+		local base  = string.match(p, "(.*)%.[^.]+$")
+		local inlet = event.inlet
+
+		if event.etype == "Create" or
+		   event.etype == "Modify" or 
+		   event.etype == "Delete" 
+		then
+			for k, _ in pairs(formats) do
+				inlet.rmExclude(base..'.'..k)
+			end
+		end
+	end,
+
+	-----
+	-- Does not collapse anything
+	collapse = function()
+		return 3
+	end,
+}
+
+sync{convert, source="magicdir", recursive=false}
+