lang: funcs: core: Move world API functions

Some of the core functions interact with the remote "world" API. Move
them all into the same package.

examples/lang/exchange0.mcl

@@ -6,9 +6,10 @@
 # time ./mgmt run --hostname h4 --seeds http://127.0.0.1:2379 --client-urls http://127.0.0.1:2385 --server-urls http://127.0.0.1:2386 --tmp-prefix --no-pgp lang --lang examples/lang/exchange0.mcl
 
 import "sys"
+import "world"
 
 $rand = random1(8)
-$exchanged = exchange("keyns", $rand)
+$exchanged = world.exchange("keyns", $rand)
 
 file "/tmp/mgmt/exchange-${sys.hostname()}" {
 	content => template("Found: {{ . }}\n", $exchanged),

examples/lang/schedule0.mcl

@@ -1,4 +1,5 @@
 import "sys"
+import "world"
 
 # here are all the possible options:
 #$opts = struct{strategy => "rr", max => 3, reuse => false, ttl => 10,}
@@ -10,10 +11,10 @@ import "sys"
 $opts = struct{strategy => "rr", max => 2, ttl => 10,}
 
 # schedule in a particular namespace with options:
-$set = schedule("xsched", $opts)
+$set = world.schedule("xsched", $opts)
 
 # and if you want, you can omit the options entirely:
-#$set = schedule("xsched")
+#$set = world.schedule("xsched")
 
 file "/tmp/mgmt/scheduled-${sys.hostname()}" {
 	content => template("set: {{ . }}\n", $set),

examples/lang/sendrecv3.mcl

@@ -1,7 +1,8 @@
 import "fmt"
+import "world"
 
 $ns = "estate"
-$exchanged = kvlookup($ns)
+$exchanged = world.kvlookup($ns)
 $state = maplookup($exchanged, $hostname, "default")
 
 exec "exec0" {

examples/lang/states0.mcl

@@ -1,5 +1,7 @@
+import "world"
+
 $ns = "estate"
-$exchanged = kvlookup($ns)
+$exchanged = world.kvlookup($ns)
 
 $state = maplookup($exchanged, $hostname, "default")
 

lang/funcs/core/core.go

@@ -26,4 +26,5 @@ import (
 	_ "github.com/purpleidea/mgmt/lang/funcs/core/os"
 	_ "github.com/purpleidea/mgmt/lang/funcs/core/strings"
 	_ "github.com/purpleidea/mgmt/lang/funcs/core/sys"
+	_ "github.com/purpleidea/mgmt/lang/funcs/core/world"
 )

lang/funcs/core/world/exchange_func.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package core // TODO: should this be in its own individual package?
+package coreworld
 
 import (
 	"fmt"
@@ -28,7 +28,7 @@ import (
 )
 
 func init() {
-	funcs.Register("exchange", func() interfaces.Func { return &ExchangeFunc{} }) // must register the func and name
+	funcs.ModuleRegister(moduleName, "exchange", func() interfaces.Func { return &ExchangeFunc{} })
 }
 
 // ExchangeFunc is special function which returns all the values of a given key

lang/funcs/core/world/kvlookup_func.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package core // TODO: should this be in its own individual package?
+package coreworld
 
 import (
 	"fmt"
@@ -28,7 +28,7 @@ import (
 )
 
 func init() {
-	funcs.Register("kvlookup", func() interfaces.Func { return &KVLookupFunc{} }) // must register the func and name
+	funcs.ModuleRegister(moduleName, "kvlookup", func() interfaces.Func { return &KVLookupFunc{} })
 }
 
 // KVLookupFunc is special function which returns all the values of a given key

lang/funcs/core/world/schedule_func.go

@@ -27,7 +27,7 @@
 // kill h2
 // kill h1... all done!
 
-package core // TODO: should this be in its own individual package?
+package coreworld
 
 import (
 	"context"
@@ -47,7 +47,7 @@ const (
 )
 
 func init() {
-	funcs.Register("schedule", func() interfaces.Func { return &SchedulePolyFunc{} }) // must register the func and name
+	funcs.ModuleRegister(moduleName, "schedule", func() interfaces.Func { return &SchedulePolyFunc{} })
 }
 
 // SchedulePolyFunc is special function which determines where code should run

lang/funcs/core/world/world.go

@@ -0,0 +1,23 @@
+// Mgmt
+// Copyright (C) 2013-2018+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package coreworld
+
+const (
+	// moduleName is the prefix given to all the functions in this module.
+	moduleName = "world"
+)