Feature request: syntax highlighting for .dump-stg and .dump-simpl files

[varosi]

I'll be great to have such highlighting and it'll help debugging.

I mean files that are generated with -ddump-simpl and -ddump-stg GHC flags.

[lierdakil]

If there is a formal syntax definition somewhere out there, I might take a look. Otherwise, not very likely in the near future.

[varosi]

It's not well documented, but -ddump-stg generate some basic syntax, that could be used.
Like:
`

==================== STG syntax: ====================
2016-11-15 21:26:07.5810105 UTC

add :: forall a. Num a => a -> a -> a =
\r srt:SRT:[] [$dNum a1 b] + $dNum a1 b;

main2 :: [Char] = \u srt:SRT:[] [] unpackCString# "hello world"#;

main1 :: State# RealWorld -> (# State# RealWorld, () #) =
\r srt:SRT:[rzi :-> hPutStr2, rAy :-> stdout, r1Dw :-> main2] [eta]
hPutStr2 stdout main2 True eta;

main :: IO () = \r srt:SRT:[r1Dv :-> main1] [eta] main1 eta;

main3 :: State# RealWorld -> (# State# RealWorld, () #) =
\r srt:SRT:[rUd :-> runMainIO1, r1Dv :-> main1] [eta]
runMainIO1 main1 eta;

main :: IO () = \r srt:SRT:[r1Dx :-> main3] [eta] main3 eta;

$trModule2 :: TrName = NO_CCS TrNameS! ["main"#];

$trModule1 :: TrName = NO_CCS TrNameS! ["Main"#];

$trModule :: Module = NO_CCS Module! [$trModule2 $trModule1];
`

Not everything could be colored. May be types, names, type constructors and unboxed types (with sharp symbol) will be great start!