On MacOS

Requirements:

1. Homebrew (https://brew.sh/)
2. Stack, OpenSSL and c-ares (brew install haskell-stack openssl c-ares)
3. Working DAML Dev Env (https://github.com/digital-asset/daml)
4. gRPC v1.2.2 (https://github.com/grpc/grpc/blob/v1.22.x/BUILDING.md). Don't forget to check out the tag before building!
5. Compiled Haskell Bindings (https://github.com/digital-asset/daml/tree/master/language-support/hs/bindings)
6. Installed DAML SDK (https://docs.daml.com/getting-started/installation.html)

Building

1. Copy the compiled bindings into the folder lib
2. Build with stack build

Running

1. Start Sandbox with daml sandbox
2. Start chat clients with stack run chat-exe -- Alice, stack run chat-exe -- Bob and similar

Chat as Alice

Alice> :link Bob
linked: Bob
Alice> :link Nick
linked: Nick
Alice> ?
[Bob,Nick]
Alice> Hey to both of you

Chat as Dave

Dave> :link Edwina
linked: Edwina
Dave> ?
Edwina

Chat as Bob

linked: Alice
linked: Nick
Bob> ?
[Alice,Nick]
Bob> :link Dave
linked: Dave
linked: Edwina
Bob> ?
[Alice,Nick,Dave,Edwina]
Bob> Hey everyone

Chat as Nick

linked: Alice
linked: Bob
linked: Dave
linked: Edwina
Nick> ?
[Alice,Bob,Dave,Edwina]
Nick> Morning everybody
Nick> !Alice
Nick> (Alice) Who are Dave and Edwina?