Collaborative Learning :: Parsec

This project is created as a playground to learn Parsec library.

Short info about Cabal and Stack

The easiest way to start with Haskell is to install Haskell Platform. It contains GHC, Cabal and also Stack.

Haskell package manager is Cabal and it's currently in transformation to V2. To use Cabal V2 all commands should be prefixed with new- like cabal new-build. V1 manages dependencies globally and sandboxed mode does not share the same packages so V2 is preferred and it will soon be default (V3). It uses <project_name>.cabal file for specification.

Another option to manage dependencies is with Stack. It's created to solve the Cabal V1 problems. It's a wrapper around Cabal and can use package.yaml file as specification from which *.cabal file is generated (use as read-only).
It uses Stackage server to store Snapshots of libraries that are checked to work together. Stack configuration is written in stack.yaml file. Stack can also manage and run different independent versions of GHC. resolver option specify which snapshot and GHC version will be used.

* Stack can use globally installed GHC (e.g. installed with Haskell Platform) so in this project resolver is set to use snapshot with GHC 8.4.3.

colab-parsec.cabal file is generated and it's not included in this project. I'm not sure is this is the right thing but it's easier to edit package.yaml than .cabal file.
But the main reason why I'm using Stack is because Haskell IDE engine currently works with Stack but not with Cabal V2.

Build (install dependencies)

Stack commands will generate colab-parsec.cabal file.

stack build
# or
cabal new-build

Start repl

stack repl
# or
cabal new-repl