• It is assumed that you are using cabal-install >= 3.4.
• telegram-lambdabot was tested with cabal-install 3.6.2.0 and GHC 8.10.7.

1. Install djinn to enable /djinn command.

cd /path/to/projects/dir
git clone https://github.com/augustss/djinn.git
cd djinn
perl -pi -e 's/import LJTFormula/import LJTFormula\nimport Prelude hiding \(\(<>\)\)/g' src/HTypes.hs
cabal install --overwrite-policy=always

2. Install mueval to enable commands from eval plugin. The "core" Haskell plugin with set of a few REPL commands.

cd /path/to/projects/dir
git clone https://github.com/gwern/mueval.git
cd mueval
echo 'packages .\n\nwrite-ghc-environment-files: always\n' > cabal.project
cabal build
cabal install --overwrite-policy=always

3. Install hoogle to enable /hoogle command.

cd /path/to/projects/dir
git clone https://github.com/ndmitchell/hoogle.git
cd hoogle
cabal install --overwrite-policy=always
hoogle generate

It might take a while.

4. Clone this repo. Set up mueval env.

cd /path/to/projects/dir
git clone https://github.com/swamp-agr/lambdabot-telegram-plugins.git
cd lambdabot-telegram-plugins
cabal install --overwrite-policy=always
cp /path/to/projects/dir/mueval/.ghc* /path/to/projects/dir/lambdabot-telegram-plugins
perl -pi -e 's/.*mueval.*//g' .ghc*
cabal build

Add following line into .ghc* env file:

package-db dist-newstyle/packagedb/ghc-X.Y.Z

where X.Y.Z is the GHC version.

5. Set up TELEGRAM_LAMBDABOT_TOKEN env variable. Don't forget to export it.

6. Run telegram-lambdabot from the lambdabot-telegram-plugins dir (where mueval env was prepared earlier).

Set bot name via @BotFather and run:

telegram-lambdabot -n <botname>

Following commands are available:

• /irc - Send command to Lambdabot.
• /run - run . You have Haskell, 3 seconds and no IO. Go nuts!
• /let - let = . Add a binding.
• /define - let = . Add a binding.
• /undefine - undefine. Reset evaluator local bindings.
• /check - check . You have QuickCheck and 3 seconds. Prove something.
• /djinn - djinn . Generates Haskell code from a type.
• /djinnadd - djinn-add . Define a new function type or type synonym.
• /djinndel - djinn-del . Remove a symbol from the environment.
• /djinnenv - Show the current djinn environment.
• /djinnnames - Show the current djinn environment, compactly.
• /djinnclr - Reset the djinn environment.
• /djinnver - Show current djinn version.
• /free - free . Generate theorems for free.
• /index - index . Returns the Haskell modules in which is defined.
• /hoogle - hoogle . Haskell API Search for either names, or types.
• /instances - instances . Fetch the instances of a typeclass.
• /instancesimporting - instancesimporting [ [ [<module...]]] . Fetch the instances of a typeclass, importing specified modules first.
• /pl - pointless . Play with pointfree code.
• /pointy - pointful . Make code pointier.
• /repoint - pointful . Make code pointier.
• /unpointless - pointful . Make code pointier.
• /unpl - pointful . Make code pointier.
• /unpf - pointful . Make code pointier.
• /pretty - pretty . Display haskell code in a pretty-printed manner
• /listmodules - listmodules. Show available plugins.
• /list - list [module|command]. Show commands for [module] or the module providing [command].
• /echo - echo . echo irc protocol string.
• /uptime - uptime. Show uptime.
• /type - type . Return the type of a value.
• /kind - kind . Return the kind of a type.
• /undo - undo . Translate do notation to Monad operators.
• /do - do . Translate Monad operators to do notation.
• /unmtl - unroll mtl monads.
• /version - version/source. Report the version and git repo of this bot
• /help - help . Ask for help for . Try 'list' for all commands.
• /src - src . Display the implementation of a standard function.

• Production: @LaTelegrambdaBot
• Staging (offline): @LaTelagrambdaBot

• James Cook
• Chris Done
• Lambdabot maintainers
• Telegram Haskell Community