Merge pull request #5 from rnhmjoj/master

Misc improvements

README.md

@@ -56,6 +56,25 @@ We can also load the script in `ghci`:
 $ nix-scripti ./example.hs
 ```
 
+or open a nix-shell with the requested packages:
+
+```
+$ nix-scripts ./example.hs
+```
+
+### Supported languges
+
+|  Identifiers         | Language             |
+|:--------------------:|:---------------------|
+| `haskell`            | Haskell              |
+| `python2`, `python3` | Python               |
+| `perl`               | Perl 5               |
+| `javascript`         | JavaScript (node.js) |
+| `shell`              | Shell script (bash)  |
+
+Anything else will be treated as "passthough", meaning the rest of
+the line will be intpreted as nixpkgs attributes as-is.
+
 Contributing
 ------------
 

default.nix

@@ -5,7 +5,10 @@ pkgs.stdenv.mkDerivation {
   src = ./nix-script.hs;
   phases = [ "buildPhase" "installPhase" "fixupPhase" ];
   buildPhase = ''mkdir -p $out/bin; ghc -O2 $src -o $out/bin/nix-script -odir $TMP'';
-  installPhase = ''ln -s $out/bin/nix-script $out/bin/nix-scripti'';
+  installPhase = ''
+    ln -s $out/bin/nix-script $out/bin/nix-scripti
+    ln -s $out/bin/nix-script $out/bin/nix-scripts
+  '';
   buildInputs = [ (pkgs.haskellPackages.ghcWithPackages (hs: with hs; [posix-escape])) ];
   meta = {
     homepage = https://github.com/bennofs/nix-script;

nix-script.hs

@@ -43,7 +43,7 @@ baseEnv = ["LOCALE_ARCHIVE", "SSL_CERT_FILE" ,"LANG", "TERMINFO", "TERM"]
 
 -- | List of supported language definitions
 languages :: [Language]
-languages = [haskell, python, javascript, perl, shell]
+languages = [haskell, python 2, python 3, javascript, perl, shell]
   where
     haskell = Language "haskell" d r i where
       d pkgs = pure ("haskellPackages.ghcWithPackages (hs: with hs; [" ++ 
@@ -51,10 +51,12 @@ languages = [haskell, python, javascript, perl, shell]
       r script = ("runghc" , [script])
       i script = ("ghci"   , [script])
 
-    python = Language "python" d r i where
+    python v = Language ("python" ++ show v) d r i where
-      d pkgs   = "python" : map ("pythonPackages." ++) pkgs
+      d pkgs   = pure ("python" ++ (show v) ++
-      r script = ("python" , [script])
+                       ".withPackages (py: with py; [" ++
-      i script = ("python" , ["-i", script])
+                       unwords pkgs ++ "])")
+      r script = ("python" ++ show v, [script])
+      i script = ("python" ++ show v, ["-i", script])
 
     javascript = Language "javascript" d r i where
       d pkgs   = "node" : map ("nodePackages." ++) pkgs
@@ -62,7 +64,8 @@ languages = [haskell, python, javascript, perl, shell]
       i script = ("node" , [])
 
     perl = Language "perl" d r i where
-      d pkgs   = "perl" : map ("perlPackages." ++) pkgs
+      d pkgs   = pure ("perl.withPackages (pl: with pl; [" ++
+                       unwords pkgs ++ "])")
       r script = ("perl" , [script])
       i script = ("perl" , ["-d", script])
 
@@ -143,9 +146,12 @@ main = do
           pkgs        = concatMap parseHeader deps
           language    = dropWhile isSpace identifier
           interactive = last progName == 'i'
+          shell       = last progName == 's'
           interpreter = makeInter language interactive file
 
       cmd <- makeCmd interpreter args <$> makeEnv env
-      callProcess "nix-shell" ("--pure" : "--command" : cmd : "-p" : pkgs)
+      if shell
+        then callProcess "nix-shell" ("-p" : pkgs)
+        else callProcess "nix-shell" ("--pure" : "--run" : cmd : "-p" : pkgs)
 
-    _ -> fail "missing or invalid header"
+    _ -> fail "missing or invalid header"