postcss-cli: init at 4.1.0

1 files changed, 349 insertions, 0 deletions

diff --git a/modules/pkgs/postcss-cli/node-env.nix b/modules/pkgs/postcss-cli/node-env.nix
new file mode 100644
index 0000000..356e78f
--- /dev/null
+++ b/modules/pkgs/postcss-cli/node-env.nix
@@ -0,0 +1,349 @@
+# This file originates from node2nix
+
+{stdenv, nodejs, python2, utillinux, runCommand, writeTextFile}:
+
+let
+  python = if nodejs ? python then nodejs.python else python2;
+
+  # Create a tar wrapper that filters all the 'Ignoring unknown extended header keyword' noise
+  tarWrapper = runCommand "tarWrapper" {} ''
+    mkdir -p $out/bin
+
+    cat > $out/bin/tar <<EOF
+    #! ${stdenv.shell} -e
+    $(type -p tar) "\$@" --warning=no-unknown-keyword
+    EOF
+
+    chmod +x $out/bin/tar
+  '';
+
+  # Function that generates a TGZ file from a NPM project
+  buildNodeSourceDist =
+    { name, version, src, ... }:
+
+    stdenv.mkDerivation {
+      name = "node-tarball-${name}-${version}";
+      inherit src;
+      buildInputs = [ nodejs ];
+      buildPhase = ''
+        export HOME=$TMPDIR
+        tgzFile=$(npm pack)
+      '';
+      installPhase = ''
+        mkdir -p $out/tarballs
+        mv $tgzFile $out/tarballs
+        mkdir -p $out/nix-support
+        echo "file source-dist $out/tarballs/$tgzFile" >> $out/nix-support/hydra-build-products
+      '';
+    };
+
+  includeDependencies = {dependencies}:
+    stdenv.lib.optionalString (dependencies != [])
+      (stdenv.lib.concatMapStrings (dependency:
+        ''
+          # Bundle the dependencies of the package
+          mkdir -p node_modules
+          cd node_modules
+
+          # Only include dependencies if they don't exist. They may also be bundled in the package.
+          if [ ! -e "${dependency.name}" ]
+          then
+              ${composePackage dependency}
+          fi
+
+          cd ..
+        ''
+      ) dependencies);
+
+  # Recursively composes the dependencies of a package
+  composePackage = { name, packageName, src, dependencies ? [], ... }@args:
+    ''
+      DIR=$(pwd)
+      cd $TMPDIR
+
+      unpackFile ${src}
+
+      # Make the base dir in which the target dependency resides first
+      mkdir -p "$(dirname "$DIR/${packageName}")"
+
+      if [ -f "${src}" ]
+      then
+          # Figure out what directory has been unpacked
+          packageDir="$(find . -maxdepth 1 -type d | tail -1)"
+
+          # Restore write permissions to make building work
+          find "$packageDir" -type d -print0 | xargs -0 chmod u+x
+          chmod -R u+w "$packageDir"
+
+          # Move the extracted tarball into the output folder
+          mv "$packageDir" "$DIR/${packageName}"
+      elif [ -d "${src}" ]
+      then
+          # Get a stripped name (without hash) of the source directory.
+          # On old nixpkgs it's already set internally.
+          if [ -z "$strippedName" ]
+          then
+              strippedName="$(stripHash ${src})"
+          fi
+
+          # Restore write permissions to make building work
+          chmod -R u+w "$strippedName"
+
+          # Move the extracted directory into the output folder
+          mv "$strippedName" "$DIR/${packageName}"
+      fi
+
+      # Unset the stripped name to not confuse the next unpack step
+      unset strippedName
+
+      # Include the dependencies of the package
+      cd "$DIR/${packageName}"
+      ${includeDependencies { inherit dependencies; }}
+      cd ..
+      ${stdenv.lib.optionalString (builtins.substring 0 1 packageName == "@") "cd .."}
+    '';
+
+  pinpointDependencies = {dependencies, production}:
+    let
+      pinpointDependenciesFromPackageJSON = writeTextFile {
+        name = "pinpointDependencies.js";
+        text = ''
+          var fs = require('fs');
+          var path = require('path');
+          
+          function resolveDependencyVersion(location, name) {
+              if(location == process.env['NIX_STORE']) {
+                  return null;
+              } else {
+                  var dependencyPackageJSON = path.join(location, "node_modules", name, "package.json");
+                  
+                  if(fs.existsSync(dependencyPackageJSON)) {
+                      var dependencyPackageObj = JSON.parse(fs.readFileSync(dependencyPackageJSON));
+                      
+                      if(dependencyPackageObj.name == name) {
+                          return dependencyPackageObj.version;
+                      }
+                  } else {
+                      return resolveDependencyVersion(path.resolve(location, ".."), name);
+                  }
+              }
+          }
+          
+          function replaceDependencies(dependencies) {
+              if(typeof dependencies == "object" && dependencies !== null) {
+                  for(var dependency in dependencies) {
+                      var resolvedVersion = resolveDependencyVersion(process.cwd(), dependency);
+                      
+                      if(resolvedVersion === null) {
+                          process.stderr.write("WARNING: cannot pinpoint dependency: "+dependency+", context: "+process.cwd()+"\n");
+                      } else {
+                          dependencies[dependency] = resolvedVersion;
+                      }
+                  }
+              }
+          }
+          
+          /* Read the package.json configuration */
+          var packageObj = JSON.parse(fs.readFileSync('./package.json'));
+          
+          /* Pinpoint all dependencies */
+          replaceDependencies(packageObj.dependencies);
+          if(process.argv[2] == "development") {
+              replaceDependencies(packageObj.devDependencies);
+          }
+          replaceDependencies(packageObj.optionalDependencies);
+          
+          /* Write the fixed package.json file */
+          fs.writeFileSync("package.json", JSON.stringify(packageObj, null, 2));
+        '';
+      };
+    in
+    ''
+      node ${pinpointDependenciesFromPackageJSON} ${if production then "production" else "development"}
+      
+      ${stdenv.lib.optionalString (dependencies != [])
+        ''
+          if [ -d node_modules ]
+          then
+              cd node_modules
+              ${stdenv.lib.concatMapStrings (dependency: pinpointDependenciesOfPackage dependency) dependencies}
+              cd ..
+          fi
+        ''}
+    '';
+  
+  # Recursively traverses all dependencies of a package and pinpoints all
+  # dependencies in the package.json file to the versions that are actually
+  # being used.
+  
+  pinpointDependenciesOfPackage = { packageName, dependencies ? [], production ? true, ... }@args:
+    ''
+      if [ -d "${packageName}" ]
+      then
+          cd "${packageName}"
+          ${pinpointDependencies { inherit dependencies production; }}
+          cd ..
+          ${stdenv.lib.optionalString (builtins.substring 0 1 packageName == "@") "cd .."}
+      fi
+    '';
+
+  # Extract the Node.js source code which is used to compile packages with
+  # native bindings
+  nodeSources = runCommand "node-sources" {} ''
+    tar --no-same-owner --no-same-permissions -xf ${nodejs.src}
+    mv node-* $out
+  '';
+
+  # Builds and composes an NPM package including all its dependencies
+  buildNodePackage = { name, packageName, version, dependencies ? [], production ? true, npmFlags ? "", dontNpmInstall ? false, preRebuild ? "", ... }@args:
+
+    stdenv.lib.makeOverridable stdenv.mkDerivation (builtins.removeAttrs args [ "dependencies" ] // {
+      name = "node-${name}-${version}";
+      buildInputs = [ tarWrapper python nodejs ] ++ stdenv.lib.optional (stdenv.isLinux) utillinux ++ args.buildInputs or [];
+      dontStrip = args.dontStrip or true; # Striping may fail a build for some package deployments
+
+      inherit dontNpmInstall preRebuild;
+
+      unpackPhase = args.unpackPhase or "true";
+
+      buildPhase = args.buildPhase or "true";
+
+      compositionScript = composePackage args;
+      pinpointDependenciesScript = pinpointDependenciesOfPackage args;
+      
+      passAsFile = [ "compositionScript" "pinpointDependenciesScript" ];
+
+      installPhase = args.installPhase or ''
+        # Create and enter a root node_modules/ folder
+        mkdir -p $out/lib/node_modules
+        cd $out/lib/node_modules
+
+        # Compose the package and all its dependencies
+        source $compositionScriptPath
+        
+        # Pinpoint the versions of all dependencies to the ones that are actually being used
+        echo "pinpointing versions of dependencies..."
+        source $pinpointDependenciesScriptPath
+
+        # Patch the shebangs of the bundled modules to prevent them from
+        # calling executables outside the Nix store as much as possible
+        patchShebangs .
+
+        # Deploy the Node.js package by running npm install. Since the
+        # dependencies have been provided already by ourselves, it should not
+        # attempt to install them again, which is good, because we want to make
+        # it Nix's responsibility. If it needs to install any dependencies
+        # anyway (e.g. because the dependency parameters are
+        # incomplete/incorrect), it fails.
+        #
+        # The other responsibilities of NPM are kept -- version checks, build
+        # steps, postprocessing etc.
+
+        export HOME=$TMPDIR
+        cd "${packageName}"
+        runHook preRebuild
+        npm --registry http://www.example.com --nodedir=${nodeSources} ${npmFlags} ${stdenv.lib.optionalString production "--production"} rebuild
+
+        if [ "$dontNpmInstall" != "1" ]
+        then
+            # NPM tries to download packages even when they already exist if npm-shrinkwrap is used.
+            rm -f npm-shrinkwrap.json
+
+            npm --registry http://www.example.com --nodedir=${nodeSources} ${npmFlags} ${stdenv.lib.optionalString production "--production"} install
+        fi
+
+        # Create symlink to the deployed executable folder, if applicable
+        if [ -d "$out/lib/node_modules/.bin" ]
+        then
+            ln -s $out/lib/node_modules/.bin $out/bin
+        fi
+
+        # Create symlinks to the deployed manual page folders, if applicable
+        if [ -d "$out/lib/node_modules/${packageName}/man" ]
+        then
+            mkdir -p $out/share
+            for dir in "$out/lib/node_modules/${packageName}/man/"*
+            do
+                mkdir -p $out/share/man/$(basename "$dir")
+                for page in "$dir"/*
+                do
+                    ln -s $page $out/share/man/$(basename "$dir")
+                done
+            done
+        fi
+
+        # Run post install hook, if provided
+        runHook postInstall
+      '';
+    });
+
+  # Builds a development shell
+  buildNodeShell = { name, packageName, version, src, dependencies ? [], production ? true, npmFlags ? "", dontNpmInstall ? false, ... }@args:
+    let
+      nodeDependencies = stdenv.mkDerivation {
+        name = "node-dependencies-${name}-${version}";
+
+        buildInputs = [ tarWrapper python nodejs ] ++ stdenv.lib.optional (stdenv.isLinux) utillinux ++ args.buildInputs or [];
+
+        includeScript = includeDependencies { inherit dependencies; };
+        pinpointDependenciesScript = pinpointDependenciesOfPackage args;
+        
+        passAsFile = [ "includeScript" "pinpointDependenciesScript" ];
+
+        buildCommand = ''
+          mkdir -p $out/lib
+          cd $out/lib
+          source $includeScriptPath
+          
+          # Pinpoint the versions of all dependencies to the ones that are actually being used
+          echo "pinpointing versions of dependencies..."
+          source $pinpointDependenciesScriptPath
+
+          # Create fake package.json to make the npm commands work properly
+          cat > package.json <<EOF
+          {
+              "name": "${packageName}",
+              "version": "${version}"
+          }
+          EOF
+
+          # Patch the shebangs of the bundled modules to prevent them from
+          # calling executables outside the Nix store as much as possible
+          patchShebangs .
+
+          export HOME=$PWD
+          npm --registry http://www.example.com --nodedir=${nodeSources} ${npmFlags} ${stdenv.lib.optionalString production "--production"} rebuild
+
+          ${stdenv.lib.optionalString (!dontNpmInstall) ''
+            # NPM tries to download packages even when they already exist if npm-shrinkwrap is used.
+            rm -f npm-shrinkwrap.json
+
+            npm --registry http://www.example.com --nodedir=${nodeSources} ${npmFlags} ${stdenv.lib.optionalString production "--production"} install
+          ''}
+
+          ln -s $out/lib/node_modules/.bin $out/bin
+        '';
+      };
+    in
+    stdenv.lib.makeOverridable stdenv.mkDerivation {
+      name = "node-shell-${name}-${version}";
+
+      buildInputs = [ python nodejs ] ++ stdenv.lib.optional (stdenv.isLinux) utillinux ++ args.buildInputs or [];
+      buildCommand = ''
+        mkdir -p $out/bin
+        cat > $out/bin/shell <<EOF
+        #! ${stdenv.shell} -e
+        $shellHook
+        exec ${stdenv.shell}
+        EOF
+        chmod +x $out/bin/shell
+      '';
+
+      # Provide the dependencies in a development shell through the NODE_PATH environment variable
+      inherit nodeDependencies;
+      shellHook = stdenv.lib.optionalString (dependencies != []) ''
+        export NODE_PATH=$nodeDependencies/lib/node_modules
+      '';
+    };
+in
+{ inherit buildNodeSourceDist buildNodePackage buildNodeShell; }