Why doesn't ghci use relative paths?
If I have a project structured like this:
project/ src/ Foo.hs Bar.hs
With files Foo.hs:
module Foo where
foo :: String
foo = "foo"
and Bar.hs:
module Bar where
import Foo
bar :: String
bar = foo ++ "bar"
If my current directory src
is and I go into ghci and run :l Bar.hs
, I get the expected output:
[1 of 2] Compiling Foo ( Foo.hs, interpreted )
[2 of 2] Compiling Bar ( Bar.hs, interpreted )
Ok, modules loaded: Bar, Foo.
But if I go to a directory project
(where I would rather stay and run vim / ghci / whatever) and try :l src/Bar.hs
, I get:
src/Bar.hs:3:8:
Could not find module βFooβ
Use -v to see a list of the files searched for.
Failed, modules loaded: none.
Why doesn't ghc look for Foo in the same directory as Bar? Can I do this? And can I propagate this change to ghc-mod and then ghcmod.vim? Because I get errors about can't find the module when I run my syntax checker or ghc-mod type checker in vim.
I am running ghc 7.10.1.
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The flag you are looking for is -i<dir>
:
% ghci --help
Usage:
ghci [command-line-options-and-input-files]
...
In addition, ghci accepts most of the command-line options that plain
GHC does. Some of the options that are commonly used are:
-i<dir> Search for imported modules in the directory <dir>.
for example
% ls src
Bar.hs Foo.hs
% ghci -isrc
GHCi, version 7.8.2: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Ξ» :l Foo
[1 of 1] Compiling Foo ( src/Foo.hs, interpreted )
Ok, modules loaded: Foo.
Ξ» :l Bar
[1 of 2] Compiling Foo ( src/Foo.hs, interpreted )
[2 of 2] Compiling Bar ( src/Bar.hs, interpreted )
Ok, modules loaded: Foo, Bar.
You can also pass a ghc-mod
flag -i<dir>
fromghcmod.vim
If you want to provide GHC options, install
g:ghcmod_ghc_options
.let g:ghcmod_ghc_options = ['-idir1', '-idir2']
In addition, there is a buffer-local version
b:ghcmod_ghc_options
.autocmd BufRead,BufNewFile ~/.xmonad/* call s:add_xmonad_path() function! s:add_xmonad_path() if !exists('b:ghcmod_ghc_options') let b:ghcmod_ghc_options = [] endif call add(b:ghcmod_ghc_options, '-i' . expand('~/.xmonad/lib')) endfunction
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