qemush : suppression de la variable function, suppression d'un shift inutile

bin/qemush

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# version=0.7.0
+# version=0.8.0
 
 # Re-exec the script as qemu via sudo (only if needed)
 [ "$(whoami)" != qemu ] && exec sudo -E -H -u qemu -- "$0" "$@"
@@ -9,6 +9,7 @@ PATH="${HOME}/launchers:${HOME}/bin:${PATH}"
 
 # Aliases
 alias ls='ls --color=auto'
+alias exec='exec '
 shopt -s expand_aliases
 
 # Set a restrictive umask to make sure qemu user files are private
@@ -192,15 +193,22 @@ public_spice() {
         socat TCP-LISTEN:"${port},reuseaddr,fork" UNIX-CLIENT:"$(pathof spice)"
 }
 
-# Retrieve user requested function
-function="$1"
-shift
+function_exists() {
+    declare -F \
+        | cut -d \  -f 3- \
+        | grep '^public_' \
+        | sed 's/^public_//' \
+        | grep -q "^${1}\$"
+}
 
 # Defauts to `active` if no function is supplied; else checks for a public
 # function named after the argument; else fails
-if [ -z "$function" ]; then
+if [ -z "$1" ]; then
     public_running
-elif declare -F | cut -d \  -f 3- | grep '^public_' | sed 's/^public_//' | grep -q "^${function}$"; then
+elif function_exists "$1"; then
+    function=$1
+    shift
+
     "public_${function}" "$@"
 else
     error_usage