1 files changed, 57 insertions, 9 deletions

diff --git a/deps/npm/lib/install/read-shrinkwrap.js b/deps/npm/lib/install/read-shrinkwrap.js
index 45e883caa2f..a48a4aea004 100644
--- a/deps/npm/lib/install/read-shrinkwrap.js
+++ b/deps/npm/lib/install/read-shrinkwrap.js
@@ -25,14 +25,7 @@ function readShrinkwrap (child, next) {
         log.warn('read-shrinkwrap', 'Ignoring package-lock.json because there is already an npm-shrinkwrap.json. Please use only one of the two.')
       }
       const name = shrinkwrap ? 'npm-shrinkwrap.json' : 'package-lock.json'
-      let parsed = null
-      if (shrinkwrap || lockfile) {
-        try {
-          parsed = parseJSON(shrinkwrap || lockfile)
-        } catch (ex) {
-          throw ex
-        }
-      }
+      const parsed = parsePkgLock(shrinkwrap || lockfile, name)
       if (parsed && parsed.lockfileVersion !== PKGLOCK_VERSION) {
         log.warn('read-shrinkwrap', `This version of npm is compatible with lockfileVersion@${PKGLOCK_VERSION}, but ${name} was generated for lockfileVersion@${parsed.lockfileVersion || 0}. I'll try to do my best with it!`)
       }
@@ -43,7 +36,8 @@ function readShrinkwrap (child, next) {
 
 function maybeReadFile (name, child) {
   return readFileAsync(
-    path.join(child.path, name)
+    path.join(child.path, name),
+    'utf8'
   ).catch({code: 'ENOENT'}, () => null)
 }
 
@@ -56,3 +50,57 @@ module.exports.andInflate = function (child, next) {
     }
   }))
 }
+
+const PARENT_RE = /\|{7,}/g
+const OURS_RE = /\<{7,}/g
+const THEIRS_RE = /\={7,}/g
+const END_RE = /\>{7,}/g
+
+module.exports._isDiff = isDiff
+function isDiff (str) {
+  return str.match(OURS_RE) && str.match(THEIRS_RE) && str.match(END_RE)
+}
+
+module.exports._parsePkgLock = parsePkgLock
+function parsePkgLock (str, filename) {
+  if (!str) { return null }
+  try {
+    return parseJSON(str)
+  } catch (e) {
+    if (isDiff(str)) {
+      log.warn('conflict', `A git conflict was detected in ${filename}. Attempting to auto-resolve.`)
+      const pieces = str.split(/[\n\r]+/g).reduce((acc, line) => {
+        if (line.match(PARENT_RE)) acc.state = 'parent'
+        else if (line.match(OURS_RE)) acc.state = 'ours'
+        else if (line.match(THEIRS_RE)) acc.state = 'theirs'
+        else if (line.match(END_RE)) acc.state = 'top'
+        else {
+          if (acc.state === 'top' || acc.state === 'ours') acc.ours += line
+          if (acc.state === 'top' || acc.state === 'theirs') acc.theirs += line
+          if (acc.state === 'top' || acc.state === 'parent') acc.parent += line
+        }
+        return acc
+      }, {
+        state: 'top',
+        ours: '',
+        theirs: '',
+        parent: ''
+      })
+      try {
+        const ours = parseJSON(pieces.ours)
+        const theirs = parseJSON(pieces.theirs)
+        return reconcileLockfiles(ours, theirs)
+      } catch (_e) {
+        log.error('conflict', `Automatic conflict resolution failed. Please manually resolve conflicts in ${filename} and try again.`)
+        log.silly('conflict', `Error during resolution: ${_e}`)
+        throw e
+      }
+    } else {
+      throw e
+    }
+  }
+}
+
+function reconcileLockfiles (parent, ours, theirs) {
+  return Object.assign({}, ours, theirs)
+}