epm play: add --list-updates (eterbug #18624)

bin/epm-play

@@ -298,6 +298,82 @@ __epm_play_install_one()
         __epm_play_run "$prescription" --run "$@" || fatal "There was some error during run $prescription script."
     fi
 }
+__get_latest_package_version()
+{
+    local pkg="$1"
+    local ver
+
+    [ -n "$pkg" ] || return 1
+
+    ver="$(epm tool eget -q -O- "https://eepm.ru/app-versions/$pkg" 2>/dev/null)"
+
+    if [ -n "$ver" ] ; then
+        echo "$ver"
+        return 0
+    fi
+
+    return 1
+}
+
+__list_available_updates()
+{
+
+    local installed_table pkg app installed latest cmp header_printed updates_found line
+
+    installed_table="$(__get_installed_table)"
+
+    [ -n "$installed_table" ] || return 0
+
+    updates_found=0
+
+    while IFS= read -r line ; do
+
+        [ -n "$line" ] || continue
+        set -- $line
+        pkg="$1"
+        app="$2"
+
+        [ -n "$pkg" ] || continue
+        [ -n "$app" ] || continue
+
+        installed="$(epm print version for package "$pkg" 2>/dev/null | head -n1)"
+
+        [ -n "$installed" ] || continue
+
+        latest="$(__get_latest_package_version "$pkg")"
+
+        [ -n "$latest" ] || continue
+
+        cmp="$(epm print compare package version "$latest" "$installed" 2>/dev/null)"
+
+        [ "$cmp" = "1" ] || continue
+
+        updates_found=1
+
+        if [ -z "$quiet" ] && [ -z "$short" ] && [ -z "$header_printed" ] ; then
+            echo "Applications with available updates:"
+            header_printed=1
+        fi
+
+        if [ -n "$short" ] ; then
+            echo "$app"
+            continue
+        fi
+
+        if [ -n "$quiet" ] ; then
+            printf "%s %s %s\n" "$app" "$installed" "$latest"
+        else
+            printf "  %-25s %s -> %s\n" "$app" "$installed" "$latest"
+        fi
+
+    done <<EOF
+    $installed_table
+EOF
+
+    if [ "$updates_found" -eq 0 ] && [ -z "$short" ] && [ -z "$quiet" ] ; then
+        echo "All installed applications are up to date."
+    fi
+}
 
 
 __epm_play_install()
@@ -503,6 +579,10 @@ case "$1" in
         exit
         ;;
 
+    --list-updates)
+        __list_available_updates
+        exit
+        ;;
     --latest)
         shift
         export latest="true"