adding script to launch godot (download + launch)

.gitignore

@@ -1,2 +1,4 @@
 # Godot 4+ specific ignores
 .godot/
+Godot.zip
+Godot_v4*linux.64

start-khanat-client.sh

@@ -0,0 +1,120 @@
+#!/bin/bash
+
+declare DEBUG=0
+declare HELP=0
+declare EDITOR=0
+declare WORKDIR="$(dirname $(readlink -f $0))"
+declare GODOT_SRC="https://downloads.tuxfamily.org/godotengine/4.0/alpha1/Godot_v4.0-alpha1_linux.64.zip"
+declare OUTZIP="$WORKDIR/Godot.zip"
+declare OPTION=""
+
+function msg_debug()
+{
+   if [ $DEBUG -ne 0 ]
+   then
+     echo "### DEBUG : $*" >&2
+   fi
+}
+
+function msg_info()
+{
+   echo "--- INFO : $*" >&2
+}
+
+function msg_error()
+{
+   echo "*** ERROR : $*" >&2
+}
+
+function download()
+{
+  local package="$1"
+  local out="$2"
+  if [ -f $2 ]
+  then
+    return 0
+  fi
+  which curl 1>/dev/null 2>/dev/null
+  if [ $? -eq 0 ]
+  then
+    curl -o $out $package
+    if [ $? -eq 0 ]
+    then
+      msg_info "Package GODOT downloaded"
+      return 0
+    fi
+  fi
+  which wget 1>/dev/null 2>/dev/null
+  if [ $? -eq 0 ]
+  then
+    wget $package -O $out
+    if [ $? -eq 0 ]
+    then
+      msg_info "Package GODOT downloaded"
+      return 0
+    fi
+  fi
+  msg_error "Impossible to download"
+  exit 2
+}
+
+function extract()
+{
+  local compressed_file="$1"
+  which unzip 1>/dev/null 2>/dev/null
+  if [ $? -eq 0 ]
+  then
+    unzip -u $compressed_file -d $WORKDIR 1>&2
+    if [ $? -eq 0 ]
+    then
+      msg_info "Uncompressed GODOT"
+      unzip -Z1 $compressed_file
+      return 0
+    fi
+  fi
+  msg_error "Impossible to extract"
+  exit 2
+}
+
+
+while getopts hdeo:s: flag
+do
+    case "${flag}" in
+        h) HELP=1;;
+        d) DEBUG=1;;
+        e) EDITOR=1;;
+        o) OUTZIP=${OPTARG};;
+        s) GODOT_SRC=${OPTARG};;
+        *) HELP=1;;
+    esac
+done
+
+if [[ $HELP -ne 0 ]]
+then
+   cat << EOF
+$(basename $0) [Option] : Donwload Launch Godot
+  Option:
+     -h : Show help
+     -d : Show debug message
+     -e : Start Godot in editor mode
+     -o <File> : target godot file (downloaded)
+     -s <Url> : Url to download a specific godot version
+EOF
+  exit 1
+fi
+
+msg_info "Start"
+msg_debug "WORKDIR:$WORKDIR OUTZIP:$OUTZIP GODOT_SRC:$GODOT_SRC"
+download "$GODOT_SRC" "$OUTZIP"
+EXE=$(extract "$OUTZIP")
+msg_info "Prg:$EXE"
+
+if [ $EDITOR -ne 0 ]
+then
+   OPTION="$OPTION -e"
+fi
+
+$WORKDIR/$EXE $OPTION
+
+
+msg_info "End"