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README
importify — manage Haskell imports quickly
Importify in a nutshell.
importify
tool helps you to manage the import section of your Haskell project modules.
GHC compiler can warn you about unused imports, and it's a good practice to remove such
imports immediately. But this becomes tedious, especially if you use explicit import lists.
Importify can remove unused imports automatically.
Before importify | After importify |
---|---|
You can use stylish-haskell
after importify
to prettify imports.
In the future, we plan for Importify to be able to:
- Add missing imports automatically, so you won't have to manage imports manually at all.
- Implement a cache server with the following features:
- Download caches for Hackage packages to speed up Importify runs.
- Upload your caches for yet-to-be-published FOSS projects to make it easier to collaborate.
- Query mappings from any module of every package to symbols exported by it to write your refactoring tools.
- Convert imports between implicit and explicit, and between qualified and unqualified forms.
- Resolve merge conflicts in import section automatically. See an example of such conflict.
Installation
Installation process assumes that you have already installed and configured stack
build tool. Currently importify
works only with projects built with stack
.
Installing from Stackage
Install just as every usual package.
stack install importify
Installing from source
Perform the next steps before driving:
git clone https://github.com/serokell/importify.git # 1. Clone repository locally
cd importify # 2. Step into folder
stack install importify\:exe\:importify # 3. Copy executable under ~/.local/bin
Usage
In short:
$ cd my-project-which-build-with-stack
$ importify cache
$ importify file path/to/File/With/Unused/Imports.hs
importify
has several commands. Most important is
importify --help
Before removing redundant imports run importify cache
command. Importify stores local cache for the project under the
.importify
folder inside your project. This cache stores exported
entities for each module for every dependency and for all your local
packages. Make sure to re-run importify cache
if you change the list
of exported functions and types in your project modules. Cache is
built incrementally; it builds dependencies only once. But if you add
dependencies or use other versions of them (for instance, because of
bumping stack lts) you need to run importify cache
again. You can
always perform rm -rf .importify
before caching if you face any
troubles.
After the cache is built, you can use importify file PATH_TO_FILE
command from your project root directory. This command runs
Importify on the file and prints the result in the terminal. If you
want to change a file in-place use the following command:
importify file -i PATH_TO_FILE
*Note that all licence references and agreements mentioned in the importify README section above
are relevant to that project's source code only.