sys-power/tlp: dependency and style fixes

The sys-power/tlp-1.9.0 ebuild had several bugs around dependency and
style:
- Blockers against tuned, laptop-mode-tools, and power-profiles-daemon
  were too aggressive. Moved to a warning instead of a hard block to
  make migrations easy/possible.
- non-standard gentoo style of repeating use? ( pkg ) in each row
  instead of using one use? () block for multiple packages
- dbus-python and pygobject were missing the proper dynamic python use
  dependencies.
- renaming USE=pd to USE=ppd for consistency with tuned

The original commit had more changes than would be expected due to it
adding a tlp-pd daemon which implements power-profile-daemon abilities.
As part of this, we noticed and added additional dependencies as
documented here: https://linrunner.de/tlp/developers/dependencies.html

Closes: https://bugs.gentoo.org/967685
Closes: https://bugs.gentoo.org/967686
Closes: https://bugs.gentoo.org/967687
Signed-off-by: Jay Faulkner <jayf@gentoo.org>

sys-power/tlp/metadata.xml

@@ -10,7 +10,7 @@
 		kernel settings that affect power consumption.
 	</longdescription>
 	<use>
-		<flag name="pd">TLP Profiles Daemon that replaces power-profiles-daemon by using the same D-Bus API.</flag>
+		<flag name="ppd">TLP Profiles Daemon that replaces power-profiles-daemon by using the same D-Bus API.</flag>
 		<flag name="rdw">Enables TLP Radio Device Wizard feature</flag> 
 	</use>
 	<upstream>

sys-power/tlp/tlp-1.9.0-r1.ebuild

@@ -15,27 +15,27 @@ S="${WORKDIR}/TLP-${PV}"
 LICENSE="GPL-2"
 SLOT="0"
 KEYWORDS="~amd64"
-REQUIRED_USE="pd? ( ${PYTHON_REQUIRED_USE} )"
+REQUIRED_USE="ppd? ( ${PYTHON_REQUIRED_USE} )"
 
 IUSE="
-	+pd
+	+ppd
 	+rdw
 "
 
+# NOTE(JayF): Upstream dep list in human-readable format:
+#             https://linrunner.de/tlp/developers/dependencies.html
 RDEPEND="
 	dev-lang/perl
-	virtual/udev
-	sys-apps/hdparm
 	net-wireless/iw
-	!app-laptop/laptop-mode-tools
+	sys-apps/hdparm
 	sys-apps/pciutils
-	!sys-apps/tuned
 	sys-apps/usbutils
-	pd? ( dev-python/dbus-python )
-	pd? ( !sys-power/power-profiles-daemon )
-	pd? ( dev-python/pygobject )
-	pd? ( ${PYTHON_DEPS} )
-	pd? ( !sys-apps/tuned )
+	virtual/udev
+	ppd? (
+		$(python_gen_cond_dep 'dev-python/dbus-python[${PYTHON_USEDEP}]')
+		$(python_gen_cond_dep 'dev-python/pygobject[${PYTHON_USEDEP}]')
+		${PYTHON_DEPS}
+	)
 	rdw? ( net-misc/networkmanager )
 "
 DEPEND="${RDEPEND}"
@@ -51,7 +51,7 @@ src_install() {
 		install-tlp install-man-tlp
 	)
 
-	use pd && myemakeargs+=(
+	use ppd && myemakeargs+=(
 		install-pd
 		install-man-pd
 	)
@@ -76,6 +76,30 @@ pkg_postinst() {
 	optfeature "see disk drive health info in tlp-stat" sys-apps/smartmontools
 	optfeature "Sleep hooks" sys-auth/elogind sys-apps/systemd
 	optfeature "Battery functions for ThinkPads prior to the Sandy Bridge generation (2011)" app-laptop/tp_smapi
+
+	if has_version "sys-power/power-profiles-daemon" && use ppd; then
+		ewarn
+		ewarn "sys-power/power-profiles-daemon is installed, but is "
+		ewarn "incompatible with tlp-pd daemon. For best results, "
+		ewarn "uninstall one of these packages or set use tlp[-ppd]."
+		ewarn
+	fi
+
+	if has_version "sys-apps/tuned"; then
+		ewarn
+		ewarn "sys-apps/tuned is installed, but is "
+		ewarn "documented by upstream sys-power/tlp to be conficting. "
+		ewarn "For best results, uninstall one of these packages."
+		ewarn
+	fi
+
+	if has_version "app-laptop/laptop-mode-tools"; then
+		ewarn
+		ewarn "app-laptop/laptop-mode-tools is installed, but is "
+		ewarn "documented by upstream sys-power/tlp to be conficting. "
+		ewarn "For best results, uninstall one of these packages."
+		ewarn
+	fi
 }
 
 pkg_postrm() {