Add default.nix for working on pandoc with Nix (#4146)

1 files changed, 101 insertions, 0 deletions

diff --git a/default.nix b/default.nix
new file mode 100644
index 000000000..f9afabe96
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,101 @@
+# This Nix file can be handy when working on the github version of pandoc.
+#
+# To build pandoc run:
+#    nix-build
+# To run a nix shell with everthing needed to build pandoc with cabal:
+#    nix-shell
+# To build pandoc for use on Linux and macOS systems without Nix:
+#    nix-build -A patched
+{ pkgs ?
+    import ((import <nixpkgs> {}).pkgs.fetchFromGitHub {
+      owner = "NixOS"; repo = "nixpkgs";
+      rev = "1354099daf98b7a1f79e6c41ce6bfda5c40177ae";
+      sha256 = "1dwnmxirzjrshlaan7cpag77y7nd09chrbakfx3c3f1lzsldbi97";
+    }) {} }:
+let haskellPackages = pkgs.haskellPackages;
+    overrides = self: super: {
+      hslua-module-text = pkgs.haskell.lib.dontCheck
+            super.hslua-module-text;
+      skylighting = super.skylighting_0_5;
+      hslua = super.hslua_0_9_3;
+    };
+    source-overrides = {
+      doctemplates = "0.2.1";
+      texmath = "0.10";
+      pandoc-types = pkgs.fetchFromGitHub {
+        owner = "jgm";
+        repo = "pandoc-types";
+        rev = "f1278603a4766f32b8375de84b8581f4bb1e665a";
+        sha256 = "05ykcs8qdjrxly9b6chjr939mv6r42mh51bl58k7jxsr1crxrrf9";
+      };
+    };
+    filterHaskellSource = src:
+      builtins.filterSource (path: type:
+        pkgs.lib.all (i: i != baseNameOf path) [ ".git" "dist-newstyle" "cabal.project.local" "dist" ".stack-work" ".DS_Store" "default.nix" "result" ]
+          && pkgs.lib.all (i: !(pkgs.lib.hasSuffix i path)) [ ".lkshf" ]
+          && pkgs.lib.all (i: !(pkgs.lib.hasPrefix i path)) [ ".ghc.environment." ]
+        ) src;
+
+    # Normal nix derivation
+    drv = (
+        haskellPackages.extend (
+          pkgs.lib.composeExtensions (
+            haskellPackages.packageSourceOverrides source-overrides
+          ) overrides
+        )
+      ).callCabal2nix "pandoc" (filterHaskellSource ./.) {};
+
+    # Like drv but with static linking for haskell libraries
+    static = pkgs.haskell.lib.justStaticExecutables (drv.overrideAttrs (old: {
+        buildInputs = old.buildInputs ++ [
+          pkgs.zlib.static
+          haskellPackages.file-embed
+        ];
+        configureFlags = [
+          "-fembed_data_files"
+          "--disable-executable-dynamic"
+        ];
+      }));
+
+    # Patch binaries for use on macOS and linux systems without nix
+    # and bundle the required gmp and lua libraries
+    patched = pkgs.stdenv.mkDerivation {
+        name = "pandoc-patched";
+        buildInputs = [
+          static
+          pkgs.zip
+          pkgs.gnutar
+        ];
+        unpackPhase = "true";
+        buildPhase = "true";
+        installPhase = if pkgs.stdenv.isDarwin
+          then ''
+              mkdir -p $out/bin
+              cp ${static}/bin/pandoc $out/bin
+              cp ${pkgs.gmp}/lib/libgmp.10.dylib $out/bin
+              cp ${pkgs.lua5_3}/lib/liblua.5.3.4.dylib $out/bin
+              chmod +w $out/bin/*
+              echo patching libgmp and liblua
+              install_name_tool -id "@executable_path/libgmp.10.dylib" "$out/bin/libgmp.10.dylib"
+              install_name_tool -id "@executable_path/liblua.5.3.4.dylib" "$out/bin/liblua.5.3.4.dylib"
+              for fn in $out/bin/*; do
+                echo patching $fn
+                install_name_tool -change "${pkgs.libiconv}/lib/libiconv.dylib" /usr/lib/libiconv.dylib "$fn"
+                install_name_tool -change "${pkgs.stdenv.libc}/lib/libSystem.B.dylib" /usr/lib/libSystem.B.dylib "$fn"
+                install_name_tool -change "${pkgs.gmp}/lib/libgmp.10.dylib" "@executable_path/libgmp.10.dylib" "$fn"
+                install_name_tool -change "${pkgs.lua5_3}/lib/liblua.5.3.4.dylib" "@executable_path/liblua.5.3.4.dylib" "$fn"
+              done
+              (cd $out/.. && zip -r $out/pandoc-macOS.zip `basename $out`/bin)
+            ''
+          else ''
+              mkdir -p $out/bin
+              cp ${static}/bin/pandoc $out/bin
+              cp ${pkgs.gmp}/lib/libgmp.so* $out/bin
+              cp ${pkgs.lua5_3}/lib/liblua.so* $out/bin
+              chmod +w $out/bin/pandoc
+              patchelf --set-interpreter /lib64/ld-linux-x86-64.so.2 $out/bin/pandoc
+              patchelf --set-rpath '$ORIGIN' $out/bin/pandoc
+              (cd $out/.. && tar -czf $out/pandoc-linux.tar.gz `basename $out`/bin)
+            '';
+    };
+in if pkgs.lib.inNixShell then drv.env else drv // { inherit static patched; }