display a list of package managers with -p

version

@@ -213,6 +213,19 @@ list_tools() {
   sed -Ene 's/^tools_(.*)=(.*)/\1 \2/p' "$0"
 }
 
+list_pms() {
+  echo "Supported package managers:"
+  echo "  apt"  
+  echo "  brew"  
+  echo "  dnf"
+  echo "  flatpak"  
+  echo "  macports"  
+  echo "  npm"  
+  echo "  pacman"  
+  echo "  pip"  
+  echo "  snap"  
+}
+
 try_pacman() {
   # is pacman installed? (Arch and derivatives)
   command -v pacman >/dev/null 2>&1 || return
@@ -386,6 +399,7 @@ then
   echo "                       (if known and installed)"
   echo "  version -h           display this help"
   echo "  version -l           display a list of known programs and their version flags"
+  echo "  version -p           display a list of supported package managers"
   echo "  version -c           display count of known programs"
   echo "  version -v           display version of version"
   echo "                       (yes, 'version version' also works!)"
@@ -414,6 +428,13 @@ then
   exit
 fi
 
+# Display all the tools we know
+if [ $1 = "-p" ]
+then
+  list_pms
+  exit
+fi
+
 # sanitize and find in the list
 sanitized=`echo "$1" | sed -e "s/-/_/"`
 tool=tools_$sanitized