add prescription for vivaldi

prescription.d/vivaldi.sh

+#!/bin/sh
+
+# TODO: common place
+fatal()
+{
+    echo "FATAL: $*" >&2
+    exit 1
+}
+
+[ "$1" != "--run" ] && echo "Install Vivaldi browser from the official site" && exit
+
+# TODO: use --debian-arch?
+# convert to debian notation
+case "$(distro_info -a)" in
+    x86_64)
+        arch=amd64
+        ;;
+    x86)
+        arch=i386
+        ;;
+    armhf)
+        arch=armhf
+        ;;
+    *)
+        fatal "$(distro_info -a) arch is not supported"
+        ;;
+esac
+
+# https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=vivaldi
+
+# TODO:
+# https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=vivaldi-ffmpeg-codecs
+
+
+# return delimiter sign in depend of package type
+get_pkg_name_delimiter()
+{
+   local pkgtype="$1"
+   [ -n "$pkgtype" ] && pkgtype="$($DISTRVENDOR -p)"
+
+   [ "$pkgtype" = "deb" ] && echo "_" && return
+   echo "-"
+}
+
+
+# https://repo.vivaldi.com/archive/rpm/x86_64/
+# https://repo.vivaldi.com/archive/rpm/x86_64/vivaldi-stable-3.4.2066.86-1.x86_64.rpm
+# https://repo.vivaldi.com/archive/rpm/i386/vivaldi-stable-3.4.2066.86-1.i386.rpm
+# https://repo.vivaldi.com/archive/deb/pool/main/
+#ds=$(get_pkg_name_delimiter)
+#epm install "https://downloads.vivaldi.com/stable/vivaldi-stable$ds${_rpmversion}${ds/-/./}$arch.$(distro_info -p)"
+
+# epm uses eget to download * names
+epm install "https://repo.vivaldi.com/archive/deb/pool/main/vivaldi-stable_*_$arch.deb"