# Learning Haskell

# Astuces
Compiler rapidement un script haskell:

## Libraries

    stak script simple.hs --resolver lts-14.18
On peut aussi le mettre dans le code source :

### [DONE]{.done .DONE} Shelly {#shelly}
### [TODO]{.todo .TODO} Xmonad {#xmonad}
1.  [TODO]{.todo .TODO} Récup de l\'écran

    {- stack script 
     --resolver lts-14.18
    -}

2.  [TODO]{.todo .TODO} Faire un projet cabal

# Learning Haskell
## Libraries
### [DONE]{.done .DONE} Shelly {#shelly}
### TODO Xmonad {#xmonad}
1.  TODO Récup de l\'écran
2.  TODO Faire un projet cabal

1.  [DONE]{.done .DONE} [An introduction to Haskell\'s
    kinds](https://www.youtube.com/watch?v=JleVecHAad4)

1.  [DONE]{.done .DONE} [An introduction to Haskell\'s kinds](https://www.youtube.com/watch?v=JleVecHAad4)

2.  [DONE]{.done .DONE} [Getting a little fancy with Haskell\'s
    kinds](https://www.youtube.com/watch?v=Qy_yxVkO8no)

2.  [DONE]{.done .DONE} [Getting a little fancy with Haskell\'s kinds](https://www.youtube.com/watch?v=Qy_yxVkO8no)

### [TODO]{.todo .TODO} Backpack {#backpack}

### TODO Backpack {#backpack}

1.  [TODO]{.todo .TODO} [Part
    1](http://blog.ezyang.com/2016/10/try-backpack-ghc-backpack/)

1.  TODO [Part 1](http://blog.ezyang.com/2016/10/try-backpack-ghc-backpack/)

    1.  [TODO]{.todo .TODO}

    1.  TODO

2.  [TODO]{.todo .TODO} [Part
    2](http://blog.ezyang.com/2017/01/try-backpack-cabal-packages/)

2.  TODO [Part 2](http://blog.ezyang.com/2017/01/try-backpack-cabal-packages/)

### [TODO]{.todo .TODO} real-world example {#real-world-example}

### TODO real-world example {#real-world-example}

### [TODO]{.todo .TODO} Relax for a few days and watch how interactive programs are being composed {#relax-for-a-few-days-and-watch-how-interactive-programs-are-being-composed}

### TODO Relax for a few days and watch how interactive programs are being composed {#relax-for-a-few-days-and-watch-how-interactive-programs-are-being-composed}

### [TODO]{.todo .TODO} Get back to the real-world example and make it a complete Cabal project. {#get-back-to-the-real-world-example-and-make-it-a-complete-cabal-project.}

### TODO Get back to the real-world example and make it a complete Cabal project. {#get-back-to-the-real-world-example-and-make-it-a-complete-cabal-project.}

# Snippets
## Date -> nombre de secondes depuis 1970
    import Date.Time
    import Date.Time.Clock.POSIX
    toSeconds x = utcTimeToPOSIXSeconds time
      where 
        time = UTCTime (fromJust day) hour 
        day = parseTimeM True defaultTimeLocale "%Y-%m-%d" x :: Maybe Day
        hour = timeOfDayToTime (TimeOfDay 14 0 0)
    

### [TODO]{.todo .TODO} [20261](https://gitlab.haskell.org/ghc/ghc/-/issues/20261) {#section}

### TODO [20261](https://gitlab.haskell.org/ghc/ghc/-/issues/20261) {#section}

### [TODO]{.todo .TODO} Lire commentary {#lire-commentary}

### TODO Lire commentary {#lire-commentary}

[TODO]{.todo .TODO}

TODO

## [TODO]{.todo .TODO} Regarder pourquoi OPTION~RADIO~ ne passe pas (cf test) {#regarder-pourquoi-optionradio-ne-passe-pas-cf-test}

## TODO Regarder pourquoi OPTION~RADIO~ ne passe pas (cf test) {#regarder-pourquoi-optionradio-ne-passe-pas-cf-test}

### [TODO]{.todo .TODO} --mirror {#mirror}

### TODO --mirror {#mirror}

1.  [TODO]{.todo .TODO} Version interactive

1.  TODO Version interactive