Added support for building standalone executable with warp

.gitignore

@@ -17,3 +17,4 @@ _build
 *.iml
 rebar3.crashdump
 *~
+warp/aesophia_cli

README.md

@@ -40,3 +40,22 @@ EXAMPLES:
 Test
 ---
     $ ./test/test_cli.sh
+
+Building a standalone executable
+---
+
+The escript built above requires an Erlang distribution on the target system to run.
+
+It's also possible to package everything into a single executable using Warp (https://github.com/dgiagio/warp/tree/master/examples/erlang):
+
+    $ ./rebar3 escriptize
+
+    $ ./rebar3 release
+
+    $ warp-packer -a linux-x64 -i _build/default/rel/aesophia_cli -e launch -o warp/aesophia_cli
+
+The standalone executable warp/aesophia_cli can now be copied to an x86 linux system without Erlang installed.
+
+Warp also supports windows x86, but this is not tested.
+
+Warp currently does not support arm64.

rebar.config

@@ -20,3 +20,13 @@
 {profiles, [{test,
              [{erl_opts, [debug_info]}
             ]}]}.
+
+{relx, [{release, { aesophia_cli, "7.0.1" },
+              [sasl, aesophia_cli, aesophia, aeserialization, eblake2]},
+
+        {dev_mode, false},
+        {include_erts, true}, % To include Erlang runtime system
+        {extended_start_script, true}, % Should be true
+
+        {overlay, [{template, "./warp/launch", "launch"},
+                   {copy, "_build/default/bin/aesophia_cli", "aesophia_cli"}]}]}.

warp/launch

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+DIR="$(cd "$(dirname "$0")" ; pwd -P)"
+APP=$DIR/bin/{{release_name}}
+
+exec $APP escript aesophia_cli $@
+