hsimport

A command line program for extending the import list of a Haskell source file.

hsimport gets the module name and the symbol name to import as arguments, parses the given source file by using the library haskell-src-exts and than tries to only extend the import list if it's necessary. If the symbol is already imported or if the whole module is already imported, than the given source file isn't changed.

Installation

cabal install hsimport

Examples

$ hsimport -m 'Control.Monad' SomeSource.hs`
=> import Control.Monad

$ hsimport -m 'Control.Monad' -s 'when' SomeSource.hs
=> import Control.Monad (when)

$ hsimport -m 'Control.Monad' -q 'CM' SomeSource.hs
=> import qualified Control.Monad as CM

Text Editor Integration

vim-hsimport

Command Line Usage

dan@machine ~> hsimport --help
hsimport [OPTIONS] [SOURCEFILE]
  A command line program for extending the import list of a Haskell source
  file.

Common flags:
  -m --modulename=ITEM     The module to import
  -s --symbolname=ITEM     The symbol to import, if empty, the entire module
                           is imported
  -q --qualifiedname=ITEM  The name to use for a qualified module import
  -o --outputsrcfile=FILE  Save modified source file to file, if empty, the
                           source file is modified inplace
  -h --help                Display help message
  -v --version             Print version information

Issues

There is some rudimentarily handling for code using CPP, but the import statements might be added at the wrong place, because the lines containing CPP directives are ignored and therefore they aren't considered in the source line count.