setup-util-bottom: cross-platform support

close ClementTsang/bottom#709

ref #147

commands/setup-util-bottom

@@ -2,10 +2,53 @@
 source "$DOROTHY/sources/strict.bash"
 
 # https://github.com/ClementTsang/bottom
+# https://github.com/ClementTsang/bottom/releases
 # top alternative
 
+# bottom_0.6.8_amd64.deb
+# bottom_aarch64-unknown-linux-gnu.tar.gz
+# bottom_armv7-unknown-linux-gnueabihf.tar.gz
+# bottom_i686-pc-windows-msvc.zip
+# bottom_i686-unknown-linux-gnu.tar.gz
+# bottom_i686-unknown-linux-musl.tar.gz
+# bottom_powerpc64le-unknown-linux-gnu.tar.gz
+# bottom_riscv64gc-unknown-linux-gnu.tar.gz
+# bottom_x86_64-apple-darwin.tar.gz
+# bottom_x86_64-pc-windows-gnu.zip
+# bottom_x86_64-pc-windows-msvc.zip
+# bottom_x86_64-unknown-linux-gnu.tar.gz
+# bottom_x86_64-unknown-linux-gnu2-17.tar.gz
+# bottom_x86_64-unknown-linux-musl.tar.gz
+# bottom_x86_64_installer.msi
+
 function setup-util-bottom() (
+	# determine github args if github is an option on this platform
+	local arch github_asset_filter='' github=()
+	arch="$(get-arch)"
+	if is-mac; then
+		github_asset_filter='_x86_64-apple-darwin'
+	elif test "$arch" = 'a64'; then
+		github_asset_filter='_aarch64-unknown-linux-gnu'
+	elif test "$arch" = 'a32'; then
+		github_asset_filter='_armv7-unknown-linux-gnu'
+	elif test "$arch" = 'x64'; then
+		github_asset_filter='_x86_64-unknown-linux-musl'
+	elif test "$arch" = 'x32'; then
+		github_asset_filter='_i686-unknown-linux-musl'
+	fi
+	if test -n "$github_asset_filter"; then
+		github+=(
+			GITHUB_SLUG='ClementTsang/bottom'
+			GITHUB_RELEASE='latest'
+			GITHUB_ASSET_FILTER="$github_asset_filter"
+			GITHUB_UNZIP_FILTER='**/btm'
+			GITHUB_FILENAME='btm'
+		)
+	fi
+
+	# install, preferring github
 	setup-util "$@" --name='bottom' --cli='btm' \
+		"${github[@]}" \
 		AUR='bottom-bin' \
 		BREW='bottom' \
 		CARGO='bottom' \
@@ -20,7 +63,8 @@ function setup-util-bottom() (
 		sudo eselect repository enable guru
 		sudo emerge --sync guru
 		echo "sys-process/bottom" | sudo tee /etc/portage/package.accept_keywords/10-guru
-		sudo emerge sys-process/bottom::guru'
+		sudo emerge sys-process/bottom::guru' \
+		-- github ...
 )
 
 # fire if invoked standalone