add linting (and some initial fixes)

1 files changed, 46 insertions, 0 deletions

diff --git a/node_modules/common-path-prefix/index.js b/node_modules/common-path-prefix/index.js
new file mode 100644
index 000000000..c62acea9c
--- /dev/null
+++ b/node_modules/common-path-prefix/index.js
@@ -0,0 +1,46 @@
+'use strict'
+
+function getDirectoryComponents (path, sep) {
+  var components = path.split(sep)
+
+  // Remove any trailing separators and the base component.
+  var last = ''
+  while (last === '') {
+    last = components.pop()
+  }
+
+  return components
+}
+
+module.exports = function commonPathPrefix (paths, sep) {
+  if (!sep) {
+    var m = /(\/|\\)/.exec(paths[0])
+    // The first path did not contain any directory components. Bail now.
+    if (!m) return ''
+    sep = m[0]
+  }
+
+  // Object to hold prefix strings formed of the directory components of each
+  // path. The value for each prefix string is the number of times that prefix
+  // occurred in the `paths` array.
+  var prefixes = Object.create(null)
+  for (var i = 0; i < paths.length; i++) {
+    var dirComponents = getDirectoryComponents(paths[i], sep)
+    var prefix = ''
+    for (var j = 0; j < dirComponents.length; j++) {
+      prefix += dirComponents[j] + sep
+      prefixes[prefix] = (prefixes[prefix] || 0) + 1
+    }
+  }
+
+  // Find the prefixes that occurred for each path and sort them by length
+  // (longest first).
+  var common = Object.keys(prefixes).filter(function (prefix) {
+    return prefixes[prefix] === paths.length
+  }).sort(function (a, b) {
+    return b.length - a.length
+  })
+
+  // Return the longest common path prefix, or the empty string.
+  return common[0] || ''
+}