Using haskell in atom - ghc mod error - haskell

Question

I have installed Haskell minimal installer on Windows 10. I have been using haskell by writiting small programs in Notepad++ and running then by ghci using ':l myfile.hs'
I have now installed the hackable 'ATOM' text editor and installed the atom-haskell core packages.
However, I get the error below
Haskell-ghc-mod: ghc-mod failed to launch. It is probably missing or misconfigured. ENOENT
Error was: Error
spawn ghc-mod ENOENT
Debug information:
{
"dir": "C:\\Users\\myfunnyusrname\\Desktop",
"err": {
"code": "ENOENT",
"errno": "ENOENT",
"syscall": "spawn ghc-mod",
"path": "ghc-mod",
"spawnargs": [
"version"
],
"cmd": "ghc-mod version"
},
"opts": {
"cwd": "C:\\Users\\myfunnyusrname\\Desktop",
"env": {
"Path": "C:\\Program Files\\Haskell\\bin;C:\\Program Files\\Haskell Platform\\8.0.2-a\\lib\\extralibs\\bin;C:\\Program Files\\Haskell Platform\\8.0.2-a\\bin;C:\\ProgramData\\Oracle\\Java\\javapath;C:\\Program Files\\Java\\jdk1.8.0_121;C:\\Program Files\\Haskell Platform\\8.0.2-a\\mingw\\bin;C:\\Program Files\\nodejs\\;C:\\Ruby24-x64\\bin;C:\\Users\\myfunnyusrname\\Anaconda3;C:\\Users\\myfunnyusrname\\Anaconda3\\Scripts;C:\\Users\\myfunnyusrname\\Anaconda3\\Library\\bin;C:\\Users\\myfunnyusrname\\AppData\\Local\\Microsoft\\WindowsApps;C:\\Users\\myfunnyusrname\\AppData\\Roaming\\npm",
"PATH": "C:\\Program Files\\Haskell\\bin;C:\\Program Files\\Haskell Platform\\8.0.2-a\\lib\\extralibs\\bin;C:\\Program Files\\Haskell Platform\\8.0.2-a\\bin;C:\\ProgramData\\Oracle\\Java\\javapath;C:\\Program Files\\Java\\jdk1.8.0_121;C:\\Program Files\\Haskell Platform\\8.0.2-a\\mingw\\bin;C:\\Program Files\\nodejs\\;C:\\Ruby24-x64\\bin;C:\\Users\\myfunnyusrname\\Anaconda3;C:\\Users\\myfunnyusrname\\Anaconda3\\Scripts;C:\\Users\\myfunnyusrname\\Anaconda3\\Library\\bin;C:\\Users\\myfunnyusrname\\AppData\\Local\\Microsoft\\WindowsApps;C:\\Users\\myfunnyusrname\\AppData\\Roaming\\npm"
},
"encoding": "utf8",
"maxBuffer": null
}
}
Environment (filtered):
{
"Path": "C:\\Program Files\\Haskell\\bin;C:\\Program Files\\Haskell Platform\\8.0.2-a\\lib\\extralibs\\bin;C:\\Program Files\\Haskell Platform\\8.0.2-a\\bin;C:\\ProgramData\\Oracle\\Java\\javapath;C:\\Program Files\\Java\\jdk1.8.0_121;C:\\Program Files\\Haskell Platform\\8.0.2-a\\mingw\\bin;C:\\Program Files\\nodejs\\;C:\\Ruby24-x64\\bin;C:\\Users\\myfunnyusrname\\Anaconda3;C:\\Users\\myfunnyusrname\\Anaconda3\\Scripts;C:\\Users\\myfunnyusrname\\Anaconda3\\Library\\bin;C:\\Users\\myfunnyusrname\\AppData\\Local\\Microsoft\\WindowsApps;C:\\Users\\myfunnyusrname\\AppData\\Roaming\\npm"
}
Show Stack Trace
I understand that i am missing something BUT I do not know anything about PATH and variables.
If someone could please help me, I would be grateful to you
Note: I am using WINDOWS 10 laptop
Edit:
I have now installed ghc-mod (thanks to #Mark Seemann). But when i try 'ghc-mod' from gitbash I get:
K#ORUKO-PC MINGW64 ~
$ ghc-mod
bash: ghc-mod: command not found

Answer 1

Getting Haskell to work on Windows 10 in Atom is doable, but it does require a bit of fidgeting before you can get it to work.
ghc-mod
IIRC, ghc-mod isn't part of the GHC installation, so the first step you most likely need to take is to add it.
Cabal
If you're only using GHC (and not Stack), you can install it using Cabal:
$ cabal install ghc-mod
Stack
If you're just getting started with Haskell, then you probably want to stick with Cabal, but once you've gotten the hang of it and need to do slightly more complicated work, you should consider using Stack instead.
I usually have fairly good success with running
$ stack build ghc-mod
in my Stack project directory, but the Atom editor project has more detailed guidance here: https://github.com/atom-haskell/haskell-ghc-mod/wiki/Using-with-stack