ghci中/堆棧和包裝

Question

我用關於Interotube一些文件，沒有項目，而我的全局（或本地stack.yaml）是：

~/.stack/global 
$ cat stack.yaml 
flags: {} 
packages: [] 
extra-deps: [] 

resolver: lts-8.21 

如果我stack exec -- ghci和:l Intero.hs其中Intero.hs包含：

$ cat Intero.hs 
module Intero where 

import   Control.Lens.Lens 

我得到：

$ stack exec -- ghci 
GHCi, version 8.0.2: http://www.haskell.org/ghc/ :? for help 
Loaded GHCi configuration from /Users/nrolland/.emacs.d/.ghci 
Prelude 
λ> :l Intero.hs 
[1 of 1] Compiling Intero   (Intero.hs, interpreted) 

Intero.hs:3:1: error: 
    Failed to load interface for ‘Control.Lens.Lens’ 
    Use -v to see a list of the files searched for. 
Failed, modules loaded: none. 

我重新啓動與-v：

$ stack exec -- ghci -v 
GHCi, version 8.0.2: http://www.haskell.org/ghc/ :? for help 
Glasgow Haskell Compiler, Version 8.0.2, stage 2 booted by GHC version 7.10.3 
Using binary package database: /Users/nrolland/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/package.conf.d/package.cache 
Using binary package database: /Users/nrolland/.stack/snapshots/x86_64-osx/lts-8.23/8.0.2/pkgdb/package.cache 
Using binary package database: /Users/nrolland/Sync/clones/haskGist80/.stack-work/install/x86_64-osx/lts-8.23/8.0.2/pkgdb/package.cache 
loading package database /Users/nrolland/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/package.conf.d 
loading package database /Users/nrolland/.stack/snapshots/x86_64-osx/lts-8.23/8.0.2/pkgdb 
loading package database /Users/nrolland/Sync/clones/haskGist80/.stack-work/install/x86_64-osx/lts-8.23/8.0.2/pkgdb 
wired-in package ghc-prim mapped to ghc-prim-0.5.0.0 

和加載Intero.hs的時候，我得到

Intero.hs:3:1: error: 
    Failed to load interface for ‘Control.Lens.Lens’ 
    Locations searched: 
     Control/Lens/Lens.hs 
     Control/Lens/Lens.lhs 
     Control/Lens/Lens.hsig 
     Control/Lens/Lens.lhsig 
Upsweep partially successful. 
*** Deleting temp files: 
Deleting: 
Failed, modules loaded: none. 
loading package database /Users/nrolland/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/package.conf.d 
loading package database /Users/nrolland/.stack/snapshots/x86_64-osx/lts-8.23/8.0.2/pkgdb 
loading package database /Users/nrolland/Sync/clones/haskGist80/.stack-work/install/x86_64-osx/lts-8.23/8.0.2/pkgdb 
wired-in package ghc-prim mapped to ghc-prim-0.5.0.0 
wired-in package integer-gmp mapped to integer-gmp-1.0.0.1 
wired-in package base mapped to base-4.9.1.0 
wired-in package rts mapped to rts-1.0 
wired-in package template-haskell mapped to template-haskell-2.11.1.0 
wired-in package ghc mapped to ghc-8.0.2 
wired-in package dph-seq not found. 
wired-in package dph-par not found. 

但鏡頭是lts-8.23一部分，雖然當我看着它在我ghc-pkg沒有看到它

$ stack exec -- ghc-pkg list 
/Users/nrolland/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/package.conf.d 
    Cabal-1.24.2.0 
    array-0.5.1.1 
    base-4.9.1.0 
    binary-0.8.3.0 
    bytestring-0.10.8.1 
    containers-0.5.7.1 
    deepseq-1.4.2.0 
    directory-1.3.0.0 
    filepath-1.4.1.1 
    ghc-8.0.2 
    ghc-boot-8.0.2 
    ghc-boot-th-8.0.2 
    ghc-prim-0.5.0.0 
    ghci-8.0.2 
    haskeline-0.7.3.0 
    hoopl-3.10.2.1 
    hpc-0.6.0.3 
    integer-gmp-1.0.0.1 
    pretty-1.1.3.3 
    process-1.4.3.0 
    rts-1.0 
    template-haskell-2.11.1.0 
    terminfo-0.4.0.2 
    time-1.6.0.1 
    transformers-0.5.2.0 
    unix-2.7.2.1 
    xhtml-3000.2.1 
/Users/nrolland/.stack/snapshots/x86_64-osx/lts-8.23/8.0.2/pkgdb 
    (no packages) 
/Users/nrolland/Sync/clones/haskGist80/.stack-work/install/x86_64-osx/lts-8.23/8.0.2/pkgdb 
    (no packages) 

如何輕鬆加載模塊而無需創建完整的項目？ 這可能是容易的，但我對整個事情是如何工作的很迷茫..

Answer 1

包必須安裝（下載並編譯），他們纔可以使用：

stack install lens 

如果您正在使用一個Cabalized項目（即使對於小型項目也可以是一個好主意），堆棧會安裝cabal文件中列出的依賴項，因此您不必手動安裝它們。

迴應你的評論：我想在技術上可以下載和安裝所有（某些版本）的堆棧，但這似乎並不可取。這需要很長的時間，並且在需要安裝軟件包時幾乎沒有什麼好處。此外，我不知道有一種自動化的方式來做到這一點。我知道一些有趣的工作已經在「離線hackage」存儲上完成，但尚未準備好使用。