Use latest nixpkgs (adnelson#131)

* add some macros to conditionally skip dropSuffix

* explicitly import Control.Monad.Catch

.circleci/config.yml

@@ -1,4 +1,4 @@
-<version: 2
+version: 2
 jobs:
   build:
     docker:

README.md

@@ -66,6 +66,25 @@ $ nix-shell
 [nix-shell:nixfromnpm]$ cabal run -- <arguments>
 ```
 
+#### Customizing `nixpkgs` and GHC versions
+
+By default, we pin the version of `nixpkgs` in order to maintain a
+reliable build. However, if you'd like to build off of `nixpkgs` in
+your `NIX_PATH` or some other custom location:
+
+```bash
+$ nix-env -f release.nix -iA nixfromnpm --arg nixpkgs '<nixpkgs>'
+```
+
+The GHC version can also be set explicitly, although of course, the
+package is not guaranteed to build with any arbitrary GHC version:
+
+```bash
+$ nix-env -f release.nix -iA nixfromnpm --argstr compiler ghc802
+```
+
+Note that the above options also apply to `nix-build`, `nix-shell`, etc.
+
 ### Usage
 
 #### Using the `nix-node-packages` repo

default.nix

@@ -1,38 +1,30 @@
 { mkDerivation, aeson, ansi-terminal, base, bytestring
 , classy-prelude, containers, curl, data-default, data-fix
-, directory, hnix, hspec, lifted-base, MissingH, monad-control, mtl
+, directory, exceptions, hnix, hspec, lifted-base, MissingH
+, monad-control, mono-traversable, mtl, neat-interpolation
 , network-uri, optparse-applicative, parsec, pcre-heavy, QuickCheck
 , semver-range, SHA, shelly, stdenv, system-filepath, temporary
 , text, text-render, transformers, unix, unordered-containers
-, neat-interpolation
 }:
 mkDerivation {
   pname = "nixfromnpm";
   version = "0.13.0";
   src = ./.;
   isLibrary = true;
   isExecutable = true;
+  enableSeparateDataOutput = true;
   libraryHaskellDepends = [
     aeson ansi-terminal base bytestring classy-prelude containers curl
-    data-default data-fix directory hnix lifted-base MissingH
-    monad-control mtl network-uri optparse-applicative parsec
-    pcre-heavy semver-range SHA shelly system-filepath temporary text
-    text-render transformers unix unordered-containers
-  ];
-  executableHaskellDepends = [
-    aeson ansi-terminal base bytestring classy-prelude containers curl
-    data-default data-fix directory hnix lifted-base MissingH
-    monad-control mtl network-uri optparse-applicative parsec
-    pcre-heavy semver-range SHA shelly system-filepath temporary text
-    text-render transformers unix unordered-containers
+    data-default data-fix directory exceptions hnix lifted-base
+    MissingH monad-control mono-traversable mtl network-uri
+    optparse-applicative parsec pcre-heavy semver-range SHA shelly
+    system-filepath temporary text text-render transformers unix
+    unordered-containers
   ];
+  executableHaskellDepends = [ base optparse-applicative ];
   testHaskellDepends = [
-    aeson ansi-terminal base bytestring classy-prelude containers curl
-    data-default data-fix directory hnix hspec lifted-base MissingH
-    monad-control mtl network-uri optparse-applicative parsec
-    pcre-heavy QuickCheck semver-range SHA shelly system-filepath
-    temporary text text-render transformers unix unordered-containers
-    neat-interpolation
+    aeson base bytestring classy-prelude hnix hspec mono-traversable
+    neat-interpolation QuickCheck text
   ];
   description = "Generate nix expressions from npm packages";
   license = stdenv.lib.licenses.mit;

nixfromnpm.cabal

@@ -47,11 +47,13 @@ library
                      , NixFromNpm.Options
   other-modules:       Filesystem.Path.Wrappers
                      , NixFromNpm.HttpTools
+                     , NixFromNpm.Merge
                      , NixFromNpm.Npm.Resolve
                      , Paths_nixfromnpm
   other-extensions:    NoImplicitPrelude
   build-depends:       base >=4.8 && < 5.0
                      , classy-prelude
+                     , mono-traversable
                      , text
                      , bytestring
                      , mtl
@@ -79,6 +81,7 @@ library
                      , semver-range >=0.2.7
                      , data-fix
                      , pcre-heavy
+                     , exceptions
   default-language:    Haskell2010
 
 executable nixfromnpm
@@ -98,6 +101,7 @@ test-suite unit-tests
                      , OverloadedStrings
   build-depends:       base >=4.8 && < 5.0
                      , classy-prelude
+                     , mono-traversable
                      , aeson
                      , bytestring
                      , hnix

release.nix

@@ -1,12 +1,16 @@
-{ nixpkgs ? (import ./nix/17_09.nix) }:
+{
+  nixpkgs ? import ./nix/17_09.nix,
+  compiler ? null,
+}:
 let
-
   config   = { allowUnfree = true; };
 
   overlays = [
-    (newPkgs: oldPkgs: {
+    (newPkgs: oldPkgs: rec {
 
-      haskellPackages = oldPkgs.haskellPackages.override {
+      origHaskellPackages = if compiler == null then oldPkgs.haskellPackages
+                            else oldPkgs.haskell.packages."${compiler}";
+      haskellPackages = origHaskellPackages.override {
         overrides = haskellPackagesNew: haskellPackagesOld:
             { semver-range =
                 haskellPackagesNew.callPackage ./nix/semver-range.nix { };

shell.nix

@@ -1 +1,5 @@
-args@{...}: (import ./release.nix args).nixfromnpm.env
+{
+  nixpkgs ? import ./nix/17_09.nix,
+  compiler ? null
+}:
+  (import ./release.nix {inherit nixpkgs compiler;}).nixfromnpm.env

src/NixFromNpm/Common.hs

@@ -1,4 +1,5 @@
 {-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE NoMonomorphismRestriction #-}
 {-# LANGUAGE FlexibleContexts #-}
@@ -12,6 +13,7 @@ module NixFromNpm.Common (
     module Control.Applicative,
     module Control.Exception.Lifted,
     module Control.Monad,
+    module Control.Monad.Catch,
     module Control.Monad.Except,
     module Control.Monad.Identity,
     module Control.Monad.Reader,
@@ -35,19 +37,24 @@ module NixFromNpm.Common (
     module Control.Monad.Trans.Control,
     module System.Console.ANSI,
     Name, AuthToken, Record, (//), (<>),
-    uriToText, uriToString, putStrsLn, putStrs, dropSuffix, maybeIf, failC,
+    uriToText, uriToString, putStrsLn, putStrs, maybeIf, failC,
     errorC, joinBy, mapJoinBy, getEnv, modifyMap, unsafeParseURI,
     parseURIText, withColor, withUL, warn, warns, assert, fatal, fatalC,
     partitionEither, throw, eitherToMaybe
+#if !MIN_VERSION_mono_traversable(1,0,7)
+    , dropSuffix
+#endif
   ) where
 
 import ClassyPrelude hiding (assert, asList, find, FilePath, bracket,
                              maximum, maximumBy, (</>), (<>),
                              minimum, try, stripPrefix, ioError,
                              mapM_, sequence_, foldM, forM_, throw, throwIO,
                              filterM, replicateM, writeFile, readFile,
-                             writeFileUtf8, readFileUtf8)
+                             writeFileUtf8, readFileUtf8, catch, catches,
+                             Handler)
 import Control.Exception (throw)
+import Control.Monad.Catch (catch, catches, Handler(..))
 import qualified Prelude as P
 import Control.Monad.RWS.Strict hiding (Any, (<>))
 import Control.Monad (when)
@@ -141,11 +148,13 @@ putStrsLn = putStrLn . concat
 putStrs :: MonadIO m => [Text] -> m ()
 putStrs = putStr . concat
 
+#if !MIN_VERSION_mono_traversable(1,0,7)
 -- | Strip the given suffix from the given string.
 dropSuffix :: Text -> Text -> Text
 dropSuffix suffix input = case T.stripSuffix suffix input of
   Nothing -> input
   Just stripped -> stripped
+#endif
 
 -- | Return a Just value if the argument is True, else Nothing.
 maybeIf :: Bool -> a -> Maybe a