···

       
15
       
15
       
 
       
# generate nix expression from cabal file, replacing the version with the commit date

     

       
16
       
16
       
 
       
output=pkgs/development/haskell-modules/cabal2nix-unstable.nix

     

       
17
       
17
       
 
       
echo '# This file defines cabal2nix-unstable, used by maintainers/scripts/haskell/regenerate-hackage-packages.sh.' > "$output"

     

       
18
       
18
       
-
       
cabal2nix --subpath cabal2nix "https://github.com/NixOS/cabal2nix/archive/$commit.tar.gz" | sed -e 's/version = ".*"/version = "'"unstable-$date"'"/' >> "$output"

     

       
18
       
18
       
+
       
cabal2nix --subpath cabal2nix "https://github.com/NixOS/cabal2nix/archive/$commit.tar.gz" | sed -Ee 's/version = "(.*)"/version = "\1-unstable-'"$date"'"/' >> "$output"

     

       
19
       
19
       
 
       
nixfmt "$output"

     

···

       
35
       
35
       
 
       
}:

     

       
36
       
36
       
 
       
mkDerivation {

     

       
37
       
37
       
 
       
  pname = "cabal2nix";

     

       
38
       
38
       
-
       
  version = "unstable-2025-09-09";

     

       
38
       
38
       
+
       
  version = "2.20.1-unstable-2025-09-09";

     

       
39
       
39
       
 
       
  src = fetchzip {

     

       
40
       
40
       
 
       
    url = "https://github.com/NixOS/cabal2nix/archive/987474e0b0ed1c6b0e3fd0d07313f6996ec98b7e.tar.gz";

     

       
41
       
41
       
 
       
    sha256 = "0nixn8incqypsfyfclj40p8bdx2yn4783kzwpqfp19ql2sbc57dc";