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node_modules/node-gyp/lib/find-node-directory.js

@@ -0,0 +1,63 @@
+'use strict'
+
+const path = require('path')
+const log = require('npmlog')
+
+function findNodeDirectory (scriptLocation, processObj) {
+  // set dirname and process if not passed in
+  // this facilitates regression tests
+  if (scriptLocation === undefined) {
+    scriptLocation = __dirname
+  }
+  if (processObj === undefined) {
+    processObj = process
+  }
+
+  // Have a look to see what is above us, to try and work out where we are
+  var npmParentDirectory = path.join(scriptLocation, '../../../..')
+  log.verbose('node-gyp root', 'npm_parent_directory is ' +
+              path.basename(npmParentDirectory))
+  var nodeRootDir = ''
+
+  log.verbose('node-gyp root', 'Finding node root directory')
+  if (path.basename(npmParentDirectory) === 'deps') {
+    // We are in a build directory where this script lives in
+    // deps/npm/node_modules/node-gyp/lib
+    nodeRootDir = path.join(npmParentDirectory, '..')
+    log.verbose('node-gyp root', 'in build directory, root = ' +
+                nodeRootDir)
+  } else if (path.basename(npmParentDirectory) === 'node_modules') {
+    // We are in a node install directory where this script lives in
+    // lib/node_modules/npm/node_modules/node-gyp/lib or
+    // node_modules/npm/node_modules/node-gyp/lib depending on the
+    // platform
+    if (processObj.platform === 'win32') {
+      nodeRootDir = path.join(npmParentDirectory, '..')
+    } else {
+      nodeRootDir = path.join(npmParentDirectory, '../..')
+    }
+    log.verbose('node-gyp root', 'in install directory, root = ' +
+                nodeRootDir)
+  } else {
+    // We don't know where we are, try working it out from the location
+    // of the node binary
+    var nodeDir = path.dirname(processObj.execPath)
+    var directoryUp = path.basename(nodeDir)
+    if (directoryUp === 'bin') {
+      nodeRootDir = path.join(nodeDir, '..')
+    } else if (directoryUp === 'Release' || directoryUp === 'Debug') {
+      // If we are a recently built node, and the directory structure
+      // is that of a repository. If we are on Windows then we only need
+      // to go one level up, everything else, two
+      if (processObj.platform === 'win32') {
+        nodeRootDir = path.join(nodeDir, '..')
+      } else {
+        nodeRootDir = path.join(nodeDir, '../..')
+      }
+    }
+    // Else return the default blank, "".
+  }
+  return nodeRootDir
+}
+
+module.exports = findNodeDirectory