[k8s] Basic kubectl completion script (#113)

kubectl.lua

@@ -0,0 +1,81 @@
+local w = require('tables').wrap
+local parser = clink.arg.new_parser
+
+local function exec_kubectl(arguments, template)
+    local f = io.popen("kubectl "..arguments.." -o template --template=\""..template.."\"")
+	if not f then return w({}) end
+	local output = f:read('*all')
+	f:close()
+	local res = w({})
+	for element in output:gmatch("%S+") do table.insert(res, element) end
+	return res
+end
+
+local function get_config(config)
+    return exec_kubectl("config view", "{{ range ."..config.."  }}{{ .name }} {{ end }}")
+end
+
+local function get_config_func(config)
+	return function()
+	    return get_config(config)
+	end
+end
+
+local function get_resources(noun)
+	return exec_kubectl("get "..noun, "{{ range .items  }}{{ .metadata.name }} {{ end }}")
+end
+
+local function get_resources_func(noun)
+	return function()
+	    return get_resources(noun)
+	end
+end
+
+local resource_parser = parser(
+	{
+		"all" .. parser({get_resources_func("all")}),
+		"node" .. parser({get_resources_func("node")}),
+		"service" .. parser({get_resources_func("service")}),
+		"pod" .. parser({get_resources_func("pod")}),
+		"deployment" .. parser({get_resources_func("deployment")})
+	}
+)
+
+local scale_parser = parser(
+	{
+		"deployment" .. parser({get_resources_func("deployment")}, parser({"--replicas"}))
+	}
+)
+
+local config_parser = parser(
+	{
+		"current-context",
+		"delete-cluster",
+		"delete-context",
+		"get-clusters",
+		"get-contexts",
+		"rename-context",
+		"set",
+		"set-cluster",
+		"set-context",
+		"set-credentials",
+		"unset",
+		"use-context" .. parser({get_config_func("contexts")}),
+		"view"
+	}
+)
+
+local kubectl_parser = parser(
+	{
+	    "apply",
+		"exec" .. parser({get_resources_func("pod")}, parser({ "-it"})),
+		"get" .. resource_parser,
+		"describe" .. resource_parser,
+		"logs" .. parser({get_resources_func("pod")}),
+		"port-forward" .. parser({get_resources_func("pod")}),
+		"scale" .. scale_parser,
+		"config" .. config_parser
+	}
+)
+
+clink.arg.register_parser("kubectl", kubectl_parser)