add InputSourceSwitch (#243)

* add InputSourceSwitch

* remove bin InputSourceSelector

Source/InputSourceSwitch.spoon/init.lua

@@ -0,0 +1,113 @@
+--- === InputSourceSwitch ===
+---
+--- Automatically switch the input source when switching applications.
+---
+--- Example:
+--- ```
+--- hs.loadSpoon("InputSourceSwitch")
+---
+--- spoon.InputSourceSwitch:setApplications({
+---     ["WeChat"] = "Pinyin - Simplified",
+---     ["Mail"] = "ABC"
+--- })
+---
+--- spoon.InputSourceSwitch:start()
+--- ```
+---
+--- Download: [https://github.com/Hammerspoon/Spoons/raw/master/Spoons/InputSourceSwitch.spoon.zip](https://github.com/Hammerspoon/Spoons/raw/master/Spoons/InputSourceSwitch.spoon.zip)
+
+local obj = {}
+obj.__index = obj
+
+-- Metadata
+obj.name = "InputSourceSwitch"
+obj.version = "1.0"
+obj.author = "eks5115 <[email protected]>"
+obj.homepage = "https://github.com/Hammerspoon/Spoons"
+obj.license = "MIT - https://opensource.org/licenses/MIT"
+
+local log = hs.logger.new('InputSourceSwitch','debug')
+log.d('Init')
+
+-- Internal function used to get enabled input sources
+local function isLayout(layoutName)
+    local layouts = hs.keycodes.layouts()
+    for key, value in pairs(layouts) do
+        if (value == layoutName) then
+            return true
+        end
+    end
+
+    return false
+end
+
+local function isMethod(methodName)
+    local methods = hs.keycodes.methods()
+    for key, value in pairs(methods) do
+        if (value == methodName) then
+            return true
+        end
+    end
+
+    return false
+end
+
+local function setAppInputSource(appName, sourceName, event)
+    event = event or hs.window.filter.windowFocused
+
+    hs.window.filter.new(appName):subscribe(event, function()
+        local r = true
+
+        if (isLayout(sourceName)) then
+            r = hs.keycodes.setLayout(sourceName)
+        elseif isMethod(sourceName) then
+            r = hs.keycodes.setMethod(sourceName)
+        else
+            hs.alert.show(string.format('sourceName: %s is not layout or method', sourceName))
+        end
+
+        if (not r) then
+            hs.alert.show(string.format('set %s to %s failure', appName, sourceName))
+        end
+        end)
+end
+
+--- InputSourceSwitch.applicationMap
+--- Variable
+--- Mapping the application name to the input source
+obj.applicationsMap = {}
+
+--- InputSourceSwitch:setApplications()
+--- Method
+--- Set that mapping the application name to the input source
+---
+--- Parameters:
+---  * applications - A table containing that mapping the application name to the input source
+---     key is the application name and value is the input source name
+---     example:
+--- ```
+--- {
+---     ["WeChat"] = "Pinyin - Simplified",
+---     ["Mail"] = "ABC"
+--- }
+--- ```
+function obj:setApplications(applications)
+    for key, value in pairs(applications) do
+        obj.applicationsMap[key] = value
+    end
+end
+
+--- InputSourceSwitch:start()
+--- Method
+--- Start InputSourceSwitch
+---
+--- Parameters:
+---  * None
+function obj:start()
+    for k,v in pairs(self.applicationsMap) do
+        setAppInputSource(k, v)
+    end
+    return self
+end
+
+return obj