general improvements

diff --git a/ex b/ex
index 88470cc826233c9077f14c9349d9e1cd57be1a7a..9b82d786b8c8c3c477363f00d27bc90311847cc1 100755 (executable)
--- a/ex
+++ b/ex
@@ -33,7 +33,7 @@ Note: dtrx (package & command) extracts most of these plus some others."
       shift
       ;;
   esac
-  local x super restore_nullglob f
+  local x super restore_nullglob f cmd
   for x in "$@"; do
     case "$x" in
       # tars first, so they are higher pri than non-tar extensions
@@ -53,20 +53,33 @@ Note: dtrx (package & command) extracts most of these plus some others."
         $quiet || echo tar Jxf "$x"
         tar Jxf "$x"
         ;;
+      *.tar.zst )
+        $quiet || echo tar -I unzstd -xf "$x"
+        tar -I unzstd -xf "$x"
+        ;;
+      *.zst )
+        $quiet || echo unzstd "$x"
+        unzstd "$x"
+        ;;
       *.xz)
         $quiet || echo pixz -d "$x"
         pixz -d "$x"
         ;;
       *.7z )
-        $quiet || echo 7za x "$x"
-        7za x "$x"
+        if type -p 7za &>/dev/null; then
+          cmd=7za
+        else
+          cmd=7zr
+        fi
+        $quiet || echo 7zr x "$x"
+        $cmd x "$x"
         ;;
       *.bz2 )
         $quiet || echo bunzip2 "$x"
         bunzip2 "$x"
         ;;
       *.deb )
-        $quiet || ar x "$x"
+        $quiet || echo ar x "$x"
         ar x "$x"
         restore_nullglob=false
         if ! shopt -q nullglob; then
@@ -87,6 +100,11 @@ Note: dtrx (package & command) extracts most of these plus some others."
               tar xJf $f
               rm -f $f
               ;;
+            *.zst)
+              $quiet || echo tar -I unzstd -xf $f
+              tar -I unzstd -xf $f
+              rm -f $f
+              ;;
             *.gz)
               $quiet || echo tar xzf $f
               tar xzf $f