[SQM/luci-app-sqm] Enable sqm initiscript if a single sqm instance gets enabled

The SQM gui has confused its users with an enable button, that only served to
selecively activate/de-activate sqm instances instead of controlling sqm's
initscript (which needs to be enabled so the sqm properly starts up after a reboot
and also for hotplug to work properly). luci-app-sqm will now enable sqm's
initscript when a single sqm instance get enabled. It also informs the user about
this fact in the top margin of the sqm page. Note sqm will not disable the
initscript behind the user's back if sqm instances get disabled.
While I would have prefered this notice to be more prominent an attentive user
should notice, and most users should not care anyway. This also increases the
package release number.

Signed-off-by: Sebastian Moeller <moeller0@gmx.de>

net/luci-app-sqm/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=luci-app-sqm
 PKG_VERSION:=3
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 PKG_LICENSE:=GPLv2
 LUCI_DIR:=/usr/lib/lua/luci
 

net/luci-app-sqm/files/sqm-cbi.lua

@@ -36,9 +36,30 @@ s.addremove = true -- set to true to allow adding SQM instances in the GUI
 s.anonymous = true
 
 -- BASIC
-e = s:taboption("tab_basic", Flag, "enabled", translate("Enable"))
+e = s:taboption("tab_basic", Flag, "enabled", translate("Enable this SQM instance."))
 e.rmempty = false
 
+-- sm: following jow's advise, be helpful to the user and enable
+--     sqm's init script if even a single sm instance/interface
+--     is enabled; this is unexpected in that the init script gets
+--     enabled as soon as at least one sqm instance is enabled
+--     and that state is saved, so it does not require "Save & Apply"
+--     to effect the init scripts.
+--     the implementation was inpired/lifted from 
+--     https://github.com/openwrt/luci/blob/master/applications/luci-app-minidlna/luasrc/model/cbi/minidlna.lua
+function e.write(self, section, value)
+    if value == "1" then
+	luci.sys.init.enable("sqm")
+	m.message = translate("The SQM GUI has just enabled the sqm initscript on your behalf. Remember to disable the sqm initscript manually under System Startup menu in case this change was not wished for.")
+--	luci.sys.call("/etc/init.d/sqm start >/dev/null")
+--    else
+--	luci.sys.call("/etc/init.d/sqm stop >/dev/null")
+--	luci.sys.init.disable("sqm")
+    end
+    return Flag.write(self, section, value)
+end
+-- TODO: inform the user what we just did...
+
 n = s:taboption("tab_basic", ListValue, "interface", translate("Interface name"))
 -- sm lifted from luci-app-wol, the original implementation failed to show pppoe-ge00 type interface names
 for _, iface in ipairs(ifaces) do