epm play common: add get_github_version function

play.d/common.sh

@@ -77,13 +77,11 @@ epm()
     $EPM "$@"
 }
 
-
 eget()
 {
     epm tool eget "$@"
 }
 
-
 is_supported_arch()
 {
     local i
@@ -159,6 +157,22 @@ get_latest_version()
     done
 }
 
+get_github_version()
+{
+    is_command jq || fatal "jq not found, please install jq"
+    local url="$1"
+    local user_and_repo=${url#https://github.com/}
+    local user_and_repo=${user_and_repo%/}
+    local asset_name="$2"
+
+    if [ "$3" == "prerelease" ] ; then
+        curl -s "https://api.github.com/repos/${user_and_repo}/releases" | jq -r '.[] | .assets[].browser_download_url' | grep "$2" | head -n1
+    else
+        curl -s "https://api.github.com/repos/${user_and_repo}/releases" | jq -r '.[] | select(.prerelease == false) | .assets[].browser_download_url' | grep "$2" | head -n1
+    fi
+
+}
+
 print_product_alt()
 {
     [ -n "$1" ] || return