From d276e3adffba1e8e8f6a16d4d51d915a4766e7e7 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Sat, 14 Apr 2018 11:15:01 +0800
Subject: [PATCH 01/21] [solution] update with latest leetcode.com change

refs #9
refs #11

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/solution.discuss.js | 73 ++++++++++++++++++++++---------------
 1 file changed, 44 insertions(+), 29 deletions(-)

diff --git a/plugins/solution.discuss.js b/plugins/solution.discuss.js
index fac9c1b..1289a13 100644
--- a/plugins/solution.discuss.js
+++ b/plugins/solution.discuss.js
@@ -12,33 +12,45 @@ var session = require('../session');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/solution.discuss.md
 //
-var plugin = new Plugin(200, 'solution.discuss', '2017.12.21',
+var plugin = new Plugin(200, 'solution.discuss', '2018.04.14',
     'Plugin to fetch most voted solution in discussions.');
 
-var URL_DISCUSSES = 'https://discuss.leetcode.com/api/category/';
-var URL_DISCUSS_TOPIC = 'https://discuss.leetcode.com/topic/';
-var URL_DISCUSS_TOPIC_API = 'https://discuss.leetcode.com/api/topic/';
-
-function getSolutionDetail(solution, cb) {
-  if (!solution) return cb();
-
-  request(URL_DISCUSS_TOPIC_API + solution.slug, function(e, resp, body) {
-    if (e) return cb(e);
-    if (resp.statusCode !== 200)
-      return cb({msg: 'http error', statusCode: resp.statusCode});
-
-    var data = JSON.parse(body);
-    solution.title = data.titleRaw;
-    var $ = cheerio.load(data.posts[0].content);
-    solution.content = $.root().text();
-    return cb(null, solution);
-  });
-}
+var URL_DISCUSSES = 'https://leetcode.com/graphql';
+var URL_DISCUSS = 'https://leetcode.com/problems/$slug/discuss/$id';
 
 function getSolution(problem, lang, cb) {
   if (!problem) return cb();
 
-  request(URL_DISCUSSES + problem.discuss, function(e, resp, body) {
+  var opts = {
+    url:  URL_DISCUSSES,
+    json: true,
+    qs: {
+      query: [
+        'query fetchTopics($questionId: Int!, $pageNo: Int!, $orderBy: String!) {',
+        '  questionTopics(questionId: $questionId, pageNo: $pageNo, orderBy: $orderBy) {',
+        '    data {',
+        '      id',
+        '      title',
+        '      post {',
+        '        content',
+        '        voteCount',
+        '        author {',
+        '          username',
+        '        }',
+        '      }',
+        '    }',
+        '  }',
+        '}'
+      ].join('\n'),
+      operationName: 'fetchTopics',
+      variables: JSON.stringify({
+        pageNo:     1,
+        orderBy:    'most_votes',
+        questionId: problem.id
+      })
+    }
+  };
+  request(opts, function(e, resp, body) {
     if (e) return cb(e);
     if (resp.statusCode !== 200)
       return cb({msg: 'http error', statusCode: resp.statusCode});
@@ -51,16 +63,16 @@ function getSolution(problem, lang, cb) {
     if (lang === 'javascript') langs.push('js');
     if (lang === 'python3') langs.push('python');
 
-    var data = JSON.parse(body);
-    var solution = _.find(data.topics, function(x) {
-      var keys = x.title.toLowerCase().split(' ');
+    var solutions = body.data.questionTopics.data;
+    var solution = _.find(solutions, function(x) {
+      var keys = x.title.toLowerCase().split(/[^\w+]/);
       for (var i = 0; i < keys.length; ++i) {
         if (langs.indexOf(keys[i]) >= 0) return true;
       }
       return false;
     });
 
-    return getSolutionDetail(solution, cb);
+    return cb(null, solution);
   });
 }
 
@@ -73,16 +85,19 @@ plugin.getProblem = function(problem, cb) {
       if (e) return cb(e);
       if (!solution) return log.error('Solution not found for ' + lang);
 
+      var link = URL_DISCUSS.replace('$slug', problem.slug).replace('$id', solution.id);
+      var content = solution.post.content.replace(/\\n/g, '\n').replace(/\\t/g, '\t');
+
       log.info();
       log.info(solution.title);
       log.info();
-      log.info(chalk.underline(URL_DISCUSS_TOPIC + solution.slug));
+      log.info(chalk.underline(link));
       log.info();
       log.info('* Lang:    ' + lang);
-      log.info('* Author:  ' + solution.user.username);
-      log.info('* Votes:   ' + solution.votes);
+      log.info('* Author:  ' + solution.post.author.username);
+      log.info('* Votes:   ' + solution.post.voteCount);
       log.info();
-      log.info(solution.content);
+      log.info(content);
     });
   });
 };

From 36aa07cee70b826b248662aacfb70cab71bbcb20 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Mon, 14 May 2018 10:53:12 +0800
Subject: [PATCH 02/21] Report error if missing configurations.

refs #13

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/cpp.lint.js | 4 ++++
 plugins/github.js   | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/plugins/cpp.lint.js b/plugins/cpp.lint.js
index 5f12348..a892cd5 100644
--- a/plugins/cpp.lint.js
+++ b/plugins/cpp.lint.js
@@ -17,6 +17,10 @@ var DEFAULT_FLAGS = [
 ];
 
 plugin.testProblem = function(problem, cb) {
+  // TODO: unify error handling
+  if (!plugin.config.bin)
+    return log.error('cpplint.py not configured correctly! (plugins:cpp.lint:bin)');
+
   var flags = DEFAULT_FLAGS.concat(plugin.config.flags || []);
 
   var cmd = [
diff --git a/plugins/github.js b/plugins/github.js
index cfbb3f2..4c00e75 100644
--- a/plugins/github.js
+++ b/plugins/github.js
@@ -17,6 +17,12 @@ var plugin = new Plugin(100, 'github', '2018.03.24',
 var ctx = {};
 
 plugin.submitProblem = function(problem, cb) {
+  // TODO: unify error handling
+  if (!plugin.config.repo)
+    return log.error('GitHub repo not configured correctly! (plugins:github:repo)');
+  if (!plugin.config.token)
+    return log.error('GitHub token not configured correctly! (plugins:github:token)');
+
   var parts = url.parse(plugin.config.repo).pathname.split('/');
   var filename = path.basename(problem.file);
   parts.push(filename);

From e2cb5ae877e37151197d95df190fd09ea5f61f9b Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Tue, 29 May 2018 14:13:03 +0800
Subject: [PATCH 03/21] [lintcode] update to latest API (WIP)

refs #15 #14

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/lintcode.js | 237 +++++++++++++++++++++-----------------------
 1 file changed, 111 insertions(+), 126 deletions(-)

diff --git a/plugins/lintcode.js b/plugins/lintcode.js
index 55e3aa4..657c0af 100644
--- a/plugins/lintcode.js
+++ b/plugins/lintcode.js
@@ -6,7 +6,7 @@ var util = require('util');
 var h = require('../helper');
 var log = require('../log');
 var Plugin = require('../plugin');
-var queue = require('../queue');
+var Queue = require('../queue');
 var session = require('../session');
 
 // Still working in progress!
@@ -18,36 +18,40 @@ var session = require('../session');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/lintcode.md
 //
-var plugin = new Plugin(15, 'lintcode', '2017.08.04',
+const plugin = new Plugin(15, 'lintcode', '2018.05.29',
     'Plugin to talk with lintcode APIs.');
 
-var config = {
-  URL_BASE:          'http://www.lintcode.com/en',
-  URL_PROBLEMS:      'http://www.lintcode.com/en/problem?page=$page',
-  URL_PROBLEM:       'http://www.lintcode.com/en/problem/$slug/',
-  URL_PROBLEM_CODE:  'http://www.lintcode.com/en/problem/api/code/?problem_id=$id&language=$lang',
-  URL_TEST:          'http://www.lintcode.com/submission/api/submit/',
-  URL_TEST_VERIFY:   'http://www.lintcode.com/submission/api/refresh/?id=$id&waiting_time=0&is_test_submission=true',
-  URL_SUBMIT_VERIFY: 'http://www.lintcode.com/submission/api/refresh/?id=$id&waiting_time=0',
-  URL_LOGIN:         'http://www.lintcode.com/en/accounts/signin/'
+const config = {
+  URL_PROBLEMS:       'https://www.lintcode.com/api/problems/?page=$page',
+  URL_PROBLEM:        'https://www.lintcode.com/problem/$slug/description',
+  URL_PROBLEM_DETAIL: 'https://www.lintcode.com/api/problems/detail/?unique_name_or_alias=$slug&_format=detail',
+  URL_PROBLEM_CODE:   'https://www.lintcode.com/api/problems/$id/reset/?language=$lang',
+  URL_TEST:           'https://www.lintcode.com/api/submissions/',
+  URL_TEST_VERIFY:    'https://www.lintcode.com/api/submissions/refresh/?id=$id&is_test_submission=true',
+  URL_SUBMIT_VERIFY:  'https://www.lintcode.com/api/submissions/refresh/?id=$id',
+  URL_LOGIN:          'https://www.lintcode.com/api/accounts/signin/?next=%2F'
 };
 
-var LANGS = [
+// FIXME: add more langs
+const LANGS = [
   {value: 'cpp', text: 'C++'},
   {value: 'java', text: 'Java'},
   {value: 'python', text: 'Python'}
 ];
 
+var spin;
+
 function signOpts(opts, user) {
   opts.headers.Cookie = 'sessionid=' + user.sessionId +
                         ';csrftoken=' + user.sessionCSRF + ';';
+  opts.headers['x-csrftoken'] = user.sessionCSRF;
 }
 
 function makeOpts(url) {
-  var opts = {};
-  opts.url = url;
-  opts.headers = {};
-
+  const opts = {
+    url:     url,
+    headers: {}
+  };
   if (session.isLogin())
     signOpts(opts, session.getUser());
   return opts;
@@ -55,7 +59,7 @@ function makeOpts(url) {
 
 function checkError(e, resp, expectedStatus) {
   if (!e && resp && resp.statusCode !== expectedStatus) {
-    var code = resp.statusCode;
+    const code = resp.statusCode;
     log.debug('http error: ' + code);
 
     if (code === 403 || code === 401) {
@@ -84,126 +88,111 @@ plugin.getProblems = function(cb) {
   log.debug('running lintcode.getProblems');
 
   var problems = [];
-  var doTask = function(page, taskDone) {
-    plugin.getPageProblems(page, function(e, _problems) {
-      if (!e) problems = problems.concat(_problems);
-      return taskDone(e);
+  const getPage = function(page, queue, cb) {
+    plugin.getPageProblems(page, function(e, _problems, ctx) {
+      if (!e) {
+        problems = problems.concat(_problems);
+        queue.tasks = _.reject(queue.tasks, x => ctx.pages > 0 && x > ctx.pages);
+      }
+      return cb(e);
     });
   };
 
-  // FIXME: remove this hardcoded range!
-  var pages = [0, 1, 2, 3, 4];
-  queue.run(pages, doTask, function(e) {
-    problems = _.sortBy(problems, function(x) {
-      return -x.id;
-    });
+  const pages = _.range(1, 100);
+  const q = new Queue(pages, {}, getPage);
+  spin = h.spin('Downloading problems');
+  q.run(null, function(e, ctx) {
+    spin.stop();
+    problems = _.sortBy(problems, x => -x.id);
     return cb(e, problems);
   });
 };
 
 plugin.getPageProblems = function(page, cb) {
   log.debug('running lintcode.getPageProblems: ' + page);
-  var opts = makeOpts(config.URL_PROBLEMS.replace('$page', page));
+  const opts = makeOpts(config.URL_PROBLEMS.replace('$page', page));
 
+  spin.text = 'Downloading page ' + page;
   request(opts, function(e, resp, body) {
     e = checkError(e, resp, 200);
     if (e) return cb(e);
 
-    var $ = cheerio.load(body);
-    var problems = $('div[id=problem_list_pagination] a').map(function(i, a) {
-      var problem = {
-        locked:    false,
+    const ctx = {};
+    const json = JSON.parse(body);
+    const problems = json.problems.map(function(p, a) {
+      const problem = {
+        id:        p.id, 
+        fid:       p.id,
+        name:      p.title,
+        slug:      p.unique_name,
         category:  'lintcode',
-        state:     'None',
-        starred:   false,
-        companies: [],
+        level:     h.levelToName(p.level),
+        locked:    false,
+        percent:   p.accepted_rate,
+        starred:   p.is_favorited,
+        companies: p.company_tags,
         tags:      []
       };
-      problem.slug = $(a).attr('href').split('/').pop();
       problem.link = config.URL_PROBLEM.replace('$slug', problem.slug);
-
-      $(a).children('span').each(function(i, span) {
-        var text = $(span).text().trim();
-        var type = _split($(span).attr('class'), ' ');
-        type = type.concat(_split($(span).find('i').attr('class'), ' '));
-
-        if (type.indexOf('title') >= 0) {
-          problem.id = Number(text.split('.')[0]);
-          problem.name = text.split('.')[1].trim();
-        } else if (type.indexOf('difficulty') >= 0) problem.level = text;
-        else if (type.indexOf('rate') >= 0) problem.percent = parseInt(text, 10);
-        else if (type.indexOf('fa-star') >= 0) problem.starred = true;
-        else if (type.indexOf('fa-check') >= 0) problem.state = 'ac';
-        else if (type.indexOf('fa-minus') >= 0) problem.state = 'notac';
-        else if (type.indexOf('fa-briefcase') >= 0) problem.companies = _split($(span).attr('title'), ',');
-      });
-
+      switch (p.user_status) {
+        case 'Accepted': problem.state = 'ac'; break;
+        case 'Failed':   problem.state = 'notac'; break;
+        default:         problem.state = 'None';
+      }
       return problem;
-    }).get();
+    });
 
-    return cb(null, problems);
+    ctx.count = json.count;
+    ctx.pages = json.maximum_page;
+    return cb(null, problems, ctx);
   });
 };
 
 plugin.getProblem = function(problem, cb) {
   log.debug('running lintcode.getProblem');
-  var opts = makeOpts(problem.link);
+  const link = config.URL_PROBLEM_DETAIL.replace('$slug', problem.slug);
+  const opts = makeOpts(link);
 
+  const spin = h.spin('Downloading ' + problem.slug);
   request(opts, function(e, resp, body) {
+    spin.stop();
     e = checkError(e, resp, 200);
     if (e) return cb(e);
 
-    var $ = cheerio.load(body);
-    problem.testcase = $('textarea[id=input-testcase]').text();
+    const json = JSON.parse(body);
+    problem.testcase = json.testcase_sample;
     problem.testable = problem.testcase.length > 0;
-
-    var lines = [];
-    $('div[id=description] > div').each(function(i, div) {
-      if (i === 0) {
-        div = $(div).find('div')[0];
-        lines.push($(div).text().trim());
-        return;
-      }
-
-      var text = $(div).text().trim();
-      var type = $(div).find('b').text().trim();
-
-      if (type === 'Tags') {
-        problem.tags = _split(text, '\n');
-        problem.tags.shift();
-      } else if (type === 'Related Problems') return;
-      else lines.push(text);
-    });
-    problem.desc = lines.join('\n').replace(/\n{2,}/g, '\n');
-    problem.totalAC = '';
-    problem.totalSubmit = '';
+    problem.tags = json.tags.map(x => x.name);
+    problem.desc = cheerio.load(json.description).root().text();
+    problem.totalAC = json.total_accepted;
+    problem.totalSubmit = json.total_submissions;
     problem.templates = [];
 
-    var doTask = function(lang, taskDone) {
+    const getLang = function(lang, queue, cb) {
       plugin.getProblemCode(problem, lang, function(e, code) {
-        if (e) return taskDone(e);
-
-        lang = _.clone(lang);
-        lang.defaultCode = code;
-        problem.templates.push(lang);
-        return taskDone();
+        if (!e) {
+          lang = _.clone(lang);
+          lang.defaultCode = code;
+          problem.templates.push(lang);
+        }
+        return cb(e);
       });
     };
 
-    queue.run(LANGS, doTask, function(e) {
-      return cb(e, problem);
-    });
+    const q = new Queue(LANGS, {}, getLang);
+    q.run(null, e => cb(e, problem));
   });
 };
 
 plugin.getProblemCode = function(problem, lang, cb) {
   log.debug('running lintcode.getProblemCode:' + lang.value);
-  var url = config.URL_PROBLEM_CODE
-    .replace('$id', problem.id)
-    .replace('$lang', lang.text.replace(/\+/g, '%2b'));
-  var opts = makeOpts(url);
+  const url = config.URL_PROBLEM_CODE.replace('$id', problem.id)
+                                     .replace('$lang', lang.text.replace(/\+/g, '%2B'));
+  const opts = makeOpts(url);
 
+  const spin = h.spin('Downloading code for ' + lang.text);
   request(opts, function(e, resp, body) {
+    spin.stop();
     e = checkError(e, resp, 200);
     if (e) return cb(e);
 
@@ -213,29 +202,29 @@ plugin.getProblemCode = function(problem, lang, cb) {
 };
 
 function runCode(problem, isTest, cb) {
-  var lang = _.find(LANGS, function(x) {
-    return x.value === h.extToLang(problem.file);
-  });
-
-  var opts = makeOpts(config.URL_TEST);
+  const lang = _.find(LANGS, x => x.value === h.extToLang(problem.file));
+  const opts = makeOpts(config.URL_TEST);
+  opts.headers.referer = problem.link;
   opts.form = {
     problem_id:          problem.id,
     code:                h.getFileData(problem.file),
-    language:            lang.text,
-    csrfmiddlewaretoken: session.getUser().sessionCSRF
+    language:            lang.text
   };
   if (isTest) {
     opts.form.input = problem.testcase;
     opts.form.is_test_submission = true;
   }
 
+  spin = h.spin('Sending code to judge');
   request.post(opts, function(e, resp, body) {
+    spin.stop();
     e = checkError(e, resp, 200);
     if (e) return cb(e);
 
     var json = JSON.parse(body);
-    if (!json.id || !json.success) return cb(json.message);
+    if (!json.id) return cb('Failed to start judge!');
 
+    spin = h.spin('Waiting for judge result');
     verifyResult(json.id, isTest, cb);
   });
 }
@@ -258,6 +247,7 @@ function verifyResult(id, isTest, cb) {
 }
 
 function formatResult(result) {
+  spin.stop();
   var x = {
     ok:              result.status === 'Accepted',
     type:            'Actual',
@@ -290,7 +280,7 @@ plugin.testProblem = function(problem, cb) {
   runCode(problem, true, function(e, result) {
     if (e) return cb(e);
 
-    var expected = {
+    const expected = {
       ok:     true,
       type:   'Expected',
       answer: result.expected_answer,
@@ -322,33 +312,28 @@ plugin.starProblem = function(problem, starred, cb) {
 
 plugin.login = function(user, cb) {
   log.debug('running lintcode.login');
-  request(config.URL_LOGIN, function(e, resp, body) {
-    e = checkError(e, resp, 200);
-    if (e) return cb(e);
+  const opts = {
+    url:     config.URL_LOGIN,
+    headers: {
+      'x-csrftoken': null
+    },
+    form: {
+      username_or_email:   user.login,
+      password:            user.pass
+    }
+  };
 
-    user.loginCSRF = h.getSetCookieValue(resp, 'csrftoken');
-
-    var opts = {
-      url:     config.URL_LOGIN,
-      headers: {
-        Cookie: 'csrftoken=' + user.loginCSRF + ';'
-      },
-      form: {
-        csrfmiddlewaretoken: user.loginCSRF,
-        username_or_email:   user.login,
-        password:            user.pass
-      }
-    };
-    request.post(opts, function(e, resp, body) {
-      if (e) return cb(e);
-      if (resp.statusCode !== 302) return cb('invalid password?');
+  const spin = h.spin('Signing in lintcode.com');
+  request.post(opts, function(e, resp, body) {
+    spin.stop();
+    if (e) return cb(e);
+    if (resp.statusCode !== 200) return cb('invalid password?');
 
-      user.sessionCSRF = h.getSetCookieValue(resp, 'csrftoken');
-      user.sessionId = h.getSetCookieValue(resp, 'sessionid');
-      user.name = user.login; // FIXME
+    user.sessionCSRF = h.getSetCookieValue(resp, 'csrftoken');
+    user.sessionId = h.getSetCookieValue(resp, 'sessionid');
+    user.name = user.login; // FIXME
 
-      return cb(null, user);
-    });
+    return cb(null, user);
   });
 };
 

From a6b1a574fd65dd3001ecea1191d03f7529e385c2 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Tue, 29 May 2018 14:22:15 +0800
Subject: [PATCH 04/21] [lintcode] fixes missing level names

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/lintcode.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/plugins/lintcode.js b/plugins/lintcode.js
index 657c0af..449fbfb 100644
--- a/plugins/lintcode.js
+++ b/plugins/lintcode.js
@@ -39,6 +39,14 @@ const LANGS = [
   {value: 'python', text: 'Python'}
 ];
 
+const LEVELS = {
+  0: 'Naive',
+  1: 'Easy',
+  2: 'Medium',
+  3: 'Hard',
+  4: 'Super'
+};
+
 var spin;
 
 function signOpts(opts, user) {
@@ -126,7 +134,7 @@ plugin.getPageProblems = function(page, cb) {
         name:      p.title,
         slug:      p.unique_name,
         category:  'lintcode',
-        level:     h.levelToName(p.level),
+        level:     LEVELS[p.level],
         locked:    false,
         percent:   p.accepted_rate,
         starred:   p.is_favorited,

From 52b9353b0829bf91df75323376b2d8b5b898379c Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Tue, 29 May 2018 14:41:20 +0800
Subject: [PATCH 05/21] [WIP] talk to leetcode-cn.com

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/leetcode.cn.js | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 plugins/leetcode.cn.js

diff --git a/plugins/leetcode.cn.js b/plugins/leetcode.cn.js
new file mode 100644
index 0000000..32686ac
--- /dev/null
+++ b/plugins/leetcode.cn.js
@@ -0,0 +1,28 @@
+var Plugin = require('../plugin');
+
+//
+// [Usage]
+//
+// https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/leetcode.cn.md
+//
+var plugin = new Plugin(15, 'leetcode.cn', '2018.05.29',
+    'Plugin to talk with leetcode-cn APIs.');
+
+plugin.init = function() {
+  const config = require('../config');
+  config.sys.urls.base            = 'https://leetcode-cn.com';
+  config.sys.urls.login           = 'https://leetcode-cn.com/accounts/login/';
+  config.sys.urls.problems        = 'https://leetcode-cn.com/api/problems/$category/';
+  config.sys.urls.problem         = 'https://leetcode-cn.com/problems/$slug/description/';
+  config.sys.urls.problem_detail  = 'https://leetcode-cn.com/graphql';
+  config.sys.urls.test            = 'https://leetcode-cn.com/problems/$slug/interpret_solution/';
+  config.sys.urls.session         = 'https://leetcode-cn.com/session/';
+  config.sys.urls.submit          = 'https://leetcode-cn.com/problems/$slug/submit/';
+  config.sys.urls.submissions     = 'https://leetcode-cn.com/api/submissions/$slug';
+  config.sys.urls.submission      = 'https://leetcode-cn.com/submissions/detail/$id/';
+  config.sys.urls.verify          = 'https://leetcode-cn.com/submissions/detail/$id/check/';
+  config.sys.urls.favorites       = 'https://leetcode-cn.com/list/api/questions';
+  config.sys.urls.favorite_delete = 'https://leetcode-cn.com/list/api/questions/$hash/$id';
+};
+
+module.exports = plugin;

From 18605dd77b1f49e8dbcb2f4f984226d2b8fca395 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Wed, 30 May 2018 12:00:28 +0800
Subject: [PATCH 06/21] Refactor to use consistent config.sys.urls

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/leetcode.cn.js |  4 ++--
 plugins/lintcode.js    | 41 +++++++++++++++++++++--------------------
 2 files changed, 23 insertions(+), 22 deletions(-)

diff --git a/plugins/leetcode.cn.js b/plugins/leetcode.cn.js
index 32686ac..30c7167 100644
--- a/plugins/leetcode.cn.js
+++ b/plugins/leetcode.cn.js
@@ -5,7 +5,7 @@ var Plugin = require('../plugin');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/leetcode.cn.md
 //
-var plugin = new Plugin(15, 'leetcode.cn', '2018.05.29',
+var plugin = new Plugin(15, 'leetcode.cn', '2018.05.30',
     'Plugin to talk with leetcode-cn APIs.');
 
 plugin.init = function() {
@@ -14,7 +14,7 @@ plugin.init = function() {
   config.sys.urls.login           = 'https://leetcode-cn.com/accounts/login/';
   config.sys.urls.problems        = 'https://leetcode-cn.com/api/problems/$category/';
   config.sys.urls.problem         = 'https://leetcode-cn.com/problems/$slug/description/';
-  config.sys.urls.problem_detail  = 'https://leetcode-cn.com/graphql';
+  config.sys.urls.graphql         = 'https://leetcode-cn.com/graphql';
   config.sys.urls.test            = 'https://leetcode-cn.com/problems/$slug/interpret_solution/';
   config.sys.urls.session         = 'https://leetcode-cn.com/session/';
   config.sys.urls.submit          = 'https://leetcode-cn.com/problems/$slug/submit/';
diff --git a/plugins/lintcode.js b/plugins/lintcode.js
index 449fbfb..7f0850d 100644
--- a/plugins/lintcode.js
+++ b/plugins/lintcode.js
@@ -4,6 +4,7 @@ var request = require('request');
 var util = require('util');
 
 var h = require('../helper');
+var config = require('../config');
 var log = require('../log');
 var Plugin = require('../plugin');
 var Queue = require('../queue');
@@ -18,20 +19,9 @@ var session = require('../session');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/lintcode.md
 //
-const plugin = new Plugin(15, 'lintcode', '2018.05.29',
+const plugin = new Plugin(15, 'lintcode', '2018.05.30',
     'Plugin to talk with lintcode APIs.');
 
-const config = {
-  URL_PROBLEMS:       'https://www.lintcode.com/api/problems/?page=$page',
-  URL_PROBLEM:        'https://www.lintcode.com/problem/$slug/description',
-  URL_PROBLEM_DETAIL: 'https://www.lintcode.com/api/problems/detail/?unique_name_or_alias=$slug&_format=detail',
-  URL_PROBLEM_CODE:   'https://www.lintcode.com/api/problems/$id/reset/?language=$lang',
-  URL_TEST:           'https://www.lintcode.com/api/submissions/',
-  URL_TEST_VERIFY:    'https://www.lintcode.com/api/submissions/refresh/?id=$id&is_test_submission=true',
-  URL_SUBMIT_VERIFY:  'https://www.lintcode.com/api/submissions/refresh/?id=$id',
-  URL_LOGIN:          'https://www.lintcode.com/api/accounts/signin/?next=%2F'
-};
-
 // FIXME: add more langs
 const LANGS = [
   {value: 'cpp', text: 'C++'},
@@ -92,6 +82,17 @@ function _strip(s) {
   return util.inspect(s.trim());
 }
 
+plugin.init = function() {
+  config.sys.urls.problems       = 'https://www.lintcode.com/api/problems/?page=$page';
+  config.sys.urls.problem        = 'https://www.lintcode.com/problem/$slug/description';
+  config.sys.urls.problem_detail = 'https://www.lintcode.com/api/problems/detail/?unique_name_or_alias=$slug&_format=detail';
+  config.sys.urls.problem_code   = 'https://www.lintcode.com/api/problems/$id/reset/?language=$lang';
+  config.sys.urls.test           = 'https://www.lintcode.com/api/submissions/';
+  config.sys.urls.test_verify    = 'https://www.lintcode.com/api/submissions/refresh/?id=$id&is_test_submission=true';
+  config.sys.urls.submit_verify  = 'https://www.lintcode.com/api/submissions/refresh/?id=$id';
+  config.sys.urls.login          = 'https://www.lintcode.com/api/accounts/signin/?next=%2F';
+};
+
 plugin.getProblems = function(cb) {
   log.debug('running lintcode.getProblems');
 
@@ -118,7 +119,7 @@ plugin.getProblems = function(cb) {
 
 plugin.getPageProblems = function(page, cb) {
   log.debug('running lintcode.getPageProblems: ' + page);
-  const opts = makeOpts(config.URL_PROBLEMS.replace('$page', page));
+  const opts = makeOpts(config.sys.urls.problems.replace('$page', page));
 
   spin.text = 'Downloading page ' + page;
   request(opts, function(e, resp, body) {
@@ -141,7 +142,7 @@ plugin.getPageProblems = function(page, cb) {
         companies: p.company_tags,
         tags:      []
       };
-      problem.link = config.URL_PROBLEM.replace('$slug', problem.slug);
+      problem.link = config.sys.urls.problem.replace('$slug', problem.slug);
       switch (p.user_status) {
         case 'Accepted': problem.state = 'ac'; break;
         case 'Failed':   problem.state = 'notac'; break;
@@ -158,7 +159,7 @@ plugin.getPageProblems = function(page, cb) {
 
 plugin.getProblem = function(problem, cb) {
   log.debug('running lintcode.getProblem');
-  const link = config.URL_PROBLEM_DETAIL.replace('$slug', problem.slug);
+  const link = config.sys.urls.problem_detail.replace('$slug', problem.slug);
   const opts = makeOpts(link);
 
   const spin = h.spin('Downloading ' + problem.slug);
@@ -194,8 +195,8 @@ plugin.getProblem = function(problem, cb) {
 
 plugin.getProblemCode = function(problem, lang, cb) {
   log.debug('running lintcode.getProblemCode:' + lang.value);
-  const url = config.URL_PROBLEM_CODE.replace('$id', problem.id)
-                                     .replace('$lang', lang.text.replace(/\+/g, '%2B'));
+  const url = config.sys.urls.problem_code.replace('$id', problem.id)
+                                          .replace('$lang', lang.text.replace(/\+/g, '%2B'));
   const opts = makeOpts(url);
 
   const spin = h.spin('Downloading code for ' + lang.text);
@@ -211,7 +212,7 @@ plugin.getProblemCode = function(problem, lang, cb) {
 
 function runCode(problem, isTest, cb) {
   const lang = _.find(LANGS, x => x.value === h.extToLang(problem.file));
-  const opts = makeOpts(config.URL_TEST);
+  const opts = makeOpts(config.sys.urls.test);
   opts.headers.referer = problem.link;
   opts.form = {
     problem_id:          problem.id,
@@ -239,7 +240,7 @@ function runCode(problem, isTest, cb) {
 
 function verifyResult(id, isTest, cb) {
   log.debug('running verifyResult:' + id);
-  var url = isTest ? config.URL_TEST_VERIFY : config.URL_SUBMIT_VERIFY;
+  var url = isTest ? config.sys.urls.test_verify : config.sys.urls.submit_verify;
   var opts = makeOpts(url.replace('$id', id));
 
   request(opts, function(e, resp, body) {
@@ -321,7 +322,7 @@ plugin.starProblem = function(problem, starred, cb) {
 plugin.login = function(user, cb) {
   log.debug('running lintcode.login');
   const opts = {
-    url:     config.URL_LOGIN,
+    url:     config.sys.urls.login,
     headers: {
       'x-csrftoken': null
     },

From 78232d3af28e0374aca4db887ac5869e5503d9d6 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Wed, 30 May 2018 14:18:22 +0800
Subject: [PATCH 07/21] [cookie.chrome] support profile config.

refs #7

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 docs/cookie.chrome.md    | 22 ++++++++++++++++++++++
 plugins/cookie.chrome.js | 21 +++++++++++++++------
 2 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/docs/cookie.chrome.md b/docs/cookie.chrome.md
index a4f7593..c5a9dbc 100644
--- a/docs/cookie.chrome.md
+++ b/docs/cookie.chrome.md
@@ -26,6 +26,28 @@ Make sure build environment is ready before installing plugin:
 	$ npm install -g windows-build-tools
 	$ npm config set msvs_version 2015 -g
 
+## Config
+
+* `profile`: chrome profile in use, default value is "Default".
+
+*Set Config*
+
+	$ leetcode config plugins:cookie.chrome:profile "Your Profile"
+
+*Unset Config*
+
+	$ leetcode config -d plugins:cookie.chrome
+
+*Example*
+
+	{
+		"plugins": {
+			"cookie.chrome": {
+				"profile": "Profile 2"
+			}
+		}
+	}
+
 ## Usage
 
 If enabled, the login will try to reuse existing chrome cookies. You can verify it by printing debug output as below.
diff --git a/plugins/cookie.chrome.js b/plugins/cookie.chrome.js
index c5ac5b6..13f28f4 100644
--- a/plugins/cookie.chrome.js
+++ b/plugins/cookie.chrome.js
@@ -9,7 +9,7 @@ var session = require('../session');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/cookie.chrome.md
 //
-var plugin = new Plugin(13, 'cookie.chrome', '2017.12.23',
+var plugin = new Plugin(13, 'cookie.chrome', '2018.05.30',
     'Plugin to reuse Chrome\'s leetcode cookie.',
     ['ffi:win32', 'keytar:darwin', 'ref:win32', 'ref-struct:win32', 'sqlite3']);
 
@@ -28,7 +28,9 @@ plugin.help = function() {
 var Chrome = {};
 
 var ChromeMAC = {
-  db:          process.env.HOME + '/Library/Application Support/Google/Chrome/Default/Cookies',
+  getDBPath:   function() {
+    return `${process.env.HOME}/Library/Application Support/Google/Chrome/${this.profile}/Cookies`;
+  },
   iterations:  1003,
   getPassword: function(cb) {
     var keytar = require('keytar');
@@ -37,7 +39,9 @@ var ChromeMAC = {
 };
 
 var ChromeLinux = {
-  db:          process.env.HOME + '/.config/google-chrome/Default/Cookies',
+  getDBPath:   function() {
+    return `${process.env.HOME}/.config/google-chrome/${this.profile}/Cookies`;
+  },
   iterations:  1,
   getPassword: function(cb) {
     // FIXME: keytar failed to read gnome-keyring on ubuntu??
@@ -48,7 +52,9 @@ var ChromeLinux = {
 };
 
 var ChromeWindows = {
-  db:          path.resolve(process.env.APPDATA || '', '../Local/Google/Chrome/User Data/Default/Cookies'),
+  getDBPath:   function() {
+    return path.resolve(process.env.APPDATA || '', `../Local/Google/Chrome/User Data/${this.profile}/Cookies`);
+  },
   getPassword: function(cb) { cb(); }
 };
 
@@ -124,7 +130,7 @@ function doDecode(key, queue, cb) {
 
 Chrome.getCookies = function(cb) {
   var sqlite3 = require('sqlite3');
-  var db = new sqlite3.Database(my.db);
+  var db = new sqlite3.Database(my.getDBPath());
   var KEYS = ['csrftoken', 'LEETCODE_SESSION'];
 
   db.serialize(function() {
@@ -149,9 +155,12 @@ Chrome.getCookies = function(cb) {
 plugin.signin = function(user, cb) {
   log.debug('running cookie.chrome.signin');
   log.debug('try to copy leetcode cookies from chrome ...');
+
+  my.profile = plugin.config.profile || 'Default';
   my.getCookies(function(e, cookies) {
     if (e) {
-      log.error('failed to copy cookies: ' + e);
+      log.error(`Failed to copy cookies from profile "${my.profile}"`);
+      log.error(e);
       return plugin.next.signin(user, cb);
     }
 

From 7456f72d0a7c2f3e815462e9be7d4d1c9e0108e4 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Wed, 30 May 2018 14:33:05 +0800
Subject: [PATCH 08/21] [leetcode.cn] update docs.

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 README.md           | 1 +
 docs/leetcode.cn.md | 7 +++++++
 2 files changed, 8 insertions(+)
 create mode 100644 docs/leetcode.cn.md

diff --git a/README.md b/README.md
index 41fb9c1..ecda979 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@
 |[cpp.lint](/docs/cpp.lint.md)|C++ code syntax check|`test`|
 |[cpp.run](/docs/cpp.run.md)|Test C++ code locally|`test`|
 |[github](/docs/github.md)|Commit accpeted code to GitHub|`submit`|
+|[leetcode.cn](/docs/leetcode.cn.md)|Fight questions from leetcode-cn.com||
 |[lintcode](/docs/lintcode.md)|Fight questions from lintcode.com|`list` `show` `test` `submit` `user`|
 |[solution.discuss](/docs/solution.discuss.md)|Fetch top voted solution|`show`|
 
diff --git a/docs/leetcode.cn.md b/docs/leetcode.cn.md
new file mode 100644
index 0000000..3a65ddd
--- /dev/null
+++ b/docs/leetcode.cn.md
@@ -0,0 +1,7 @@
+# leetcode.cn
+
+Run everything against "leetcode-cn.com" instead of "leetcode.com".
+
+## Requirement
+
+You need a valid account on leetcode-cn.com since it uses diffrent user database from leetcode.com.

From 678ca1e60a9a201fa0aa46cf0441a188c8a22c45 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Thu, 31 May 2018 12:07:41 +0800
Subject: [PATCH 09/21] [lintcode] tiny fix of base url.

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/lintcode.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/plugins/lintcode.js b/plugins/lintcode.js
index 7f0850d..5e92278 100644
--- a/plugins/lintcode.js
+++ b/plugins/lintcode.js
@@ -83,6 +83,7 @@ function _strip(s) {
 }
 
 plugin.init = function() {
+  config.sys.urls.base           = 'https://www.lintcode.com';
   config.sys.urls.problems       = 'https://www.lintcode.com/api/problems/?page=$page';
   config.sys.urls.problem        = 'https://www.lintcode.com/problem/$slug/description';
   config.sys.urls.problem_detail = 'https://www.lintcode.com/api/problems/detail/?unique_name_or_alias=$slug&_format=detail';

From 80ac93367cd2030df0715125ef9f56f4b6d84d36 Mon Sep 17 00:00:00 2001
From: Eric Liang <xiliang@expedia.com>
Date: Thu, 14 Jun 2018 11:46:18 -0700
Subject: [PATCH 10/21] Add binary-search-tree tag

In Company plugin, binary search tree tag is missing.
---
 plugins/company.js | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/plugins/company.js b/plugins/company.js
index 711d8a6..3884ba0 100644
--- a/plugins/company.js
+++ b/plugins/company.js
@@ -726,6 +726,7 @@ var TAGS = {
   '217': ['array', 'hash-table'],
   '218': ['binary-indexed-tree', 'divide-and-conquer', 'heap', 'segment-tree'],
   '219': ['array', 'hash-table'],
+  '220': ['binary-search-tree'],
   '221': ['dynamic-programming'],
   '222': ['binary-search', 'tree'],
   '223': ['math'],
@@ -817,7 +818,7 @@ var TAGS = {
   '312': ['divide-and-conquer', 'dynamic-programming'],
   '313': ['heap', 'math'],
   '314': ['hash-table'],
-  '315': ['binary-indexed-tree', 'divide-and-conquer', 'segment-tree'],
+  '315': ['binary-indexed-tree', 'divide-and-conquer', 'segment-tree', 'binary-search-tree'],
   '316': ['greedy', 'stack'],
   '317': ['breadth-first-search'],
   '318': ['bit-manipulation'],
@@ -829,7 +830,7 @@ var TAGS = {
   '324': ['sort'],
   '325': ['hash-table'],
   '326': ['math'],
-  '327': ['divide-and-conquer'],
+  '327': ['divide-and-conquer', 'binary-search-tree'],
   '328': ['linked-list'],
   '329': ['depth-first-search', 'topological-sort'],
   '330': ['greedy'],
@@ -853,6 +854,7 @@ var TAGS = {
   '349': ['binary-search', 'hash-table', 'sort', 'two-pointers'],
   '350': ['binary-search', 'hash-table', 'sort', 'two-pointers'],
   '351': ['backtracking', 'dynamic-programming'],
+  '352': ['binary-search-tree'],
   '353': ['design', 'queue'],
   '354': ['binary-search', 'dynamic-programming'],
   '355': ['design', 'hash-table', 'heap'],
@@ -963,7 +965,7 @@ var TAGS = {
   '488': ['depth-first-search'],
   '490': ['breadth-first-search', 'depth-first-search'],
   '491': ['depth-first-search'],
-  '493': ['binary-indexed-tree', 'divide-and-conquer', 'segment-tree'],
+  '493': ['binary-indexed-tree', 'divide-and-conquer', 'segment-tree', 'binary-search-tree'],
   '494': ['depth-first-search', 'dynamic-programming'],
   '495': ['array'],
   '496': ['stack'],
@@ -989,6 +991,7 @@ var TAGS = {
   '526': ['backtracking'],
   '527': ['sort', 'string'],
   '529': ['breadth-first-search', 'depth-first-search'],
+  '530': ['array', 'depth-first-search', 'binary-search-tree'],
   '531': ['array', 'depth-first-search'],
   '532': ['array', 'two-pointers'],
   '533': ['array', 'depth-first-search'],
@@ -1102,7 +1105,7 @@ var TAGS = {
   '680': ['string'],
   '681': ['string'],
   '682': ['stack'],
-  '683': ['array'],
+  '683': ['array', 'binary-search-tree'],
   '684': ['graph', 'tree', 'union-find'],
   '685': ['depth-first-search', 'graph', 'tree', 'union-find'],
   '686': ['string'],
@@ -1118,12 +1121,12 @@ var TAGS = {
   '696': ['string'],
   '697': ['array'],
   '698': ['dynamic-programming'],
-  '699': ['segment-tree'],
+  '699': ['segment-tree', 'binary-search-tree'],
   '711': ['depth-first-search', 'hash-table'],
   '712': ['dynamic-programming'],
   '713': ['array', 'two-pointers'],
   '714': ['array', 'dynamic-programming', 'greedy'],
-  '715': ['array', 'segment-tree'],
+  '715': ['array', 'segment-tree', 'binary-search-tree'],
   '716': ['design'],
   '717': ['array'],
   '718': ['array', 'binary-search', 'dynamic-programming', 'hash-table'],
@@ -1139,8 +1142,8 @@ var TAGS = {
   '728': ['math'],
   '729': ['array'],
   '730': ['dynamic-programming', 'string'],
-  '731': ['array'],
-  '732': ['segment-tree'],
+  '731': ['array', 'binary-search-tree'],
+  '732': ['segment-tree', 'binary-search-tree'],
   '733': ['depth-first-search'],
   '734': ['hash-table'],
   '735': ['stack'],

From babbdf608450da7db38fcbaca1b6baf1a2555909 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=B5=A9=E5=AD=90?= <yonghaoz1994@gmail.com>
Date: Thu, 9 Aug 2018 10:18:51 +0800
Subject: [PATCH 11/21] Fix leetcode-cn urls

It seems the leetcode-cn plugin need one more url replaced for working well.
That is config.sys.urls.problem_detail
---
 plugins/leetcode.cn.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/plugins/leetcode.cn.js b/plugins/leetcode.cn.js
index 30c7167..8db8dfc 100644
--- a/plugins/leetcode.cn.js
+++ b/plugins/leetcode.cn.js
@@ -15,6 +15,7 @@ plugin.init = function() {
   config.sys.urls.problems        = 'https://leetcode-cn.com/api/problems/$category/';
   config.sys.urls.problem         = 'https://leetcode-cn.com/problems/$slug/description/';
   config.sys.urls.graphql         = 'https://leetcode-cn.com/graphql';
+  config.sys.urls.problem_detail  = 'https://leetcode.com/graphql';
   config.sys.urls.test            = 'https://leetcode-cn.com/problems/$slug/interpret_solution/';
   config.sys.urls.session         = 'https://leetcode-cn.com/session/';
   config.sys.urls.submit          = 'https://leetcode-cn.com/problems/$slug/submit/';

From 6ef569dcf78d4eb1375a40b65bb4f14494d19954 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=B5=A9=E5=AD=90?= <yonghaoz1994@gmail.com>
Date: Thu, 9 Aug 2018 10:22:04 +0800
Subject: [PATCH 12/21] Fix url

Fix url for leetcode-cn
---
 plugins/leetcode.cn.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/leetcode.cn.js b/plugins/leetcode.cn.js
index 8db8dfc..53d79ce 100644
--- a/plugins/leetcode.cn.js
+++ b/plugins/leetcode.cn.js
@@ -15,7 +15,7 @@ plugin.init = function() {
   config.sys.urls.problems        = 'https://leetcode-cn.com/api/problems/$category/';
   config.sys.urls.problem         = 'https://leetcode-cn.com/problems/$slug/description/';
   config.sys.urls.graphql         = 'https://leetcode-cn.com/graphql';
-  config.sys.urls.problem_detail  = 'https://leetcode.com/graphql';
+  config.sys.urls.problem_detail  = 'https://leetcode-cn.com/graphql';
   config.sys.urls.test            = 'https://leetcode-cn.com/problems/$slug/interpret_solution/';
   config.sys.urls.session         = 'https://leetcode-cn.com/session/';
   config.sys.urls.submit          = 'https://leetcode-cn.com/problems/$slug/submit/';

From 5ef609e75e3f19451d83ccd61e70b669d972e640 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Sun, 28 Oct 2018 11:38:09 +0800
Subject: [PATCH 13/21] move plugins' specific data into separate dirs.

* see https://github.com/skygragon/leetcode-cli/commit/b72d4d69fe6b3279d3f40f00bb836696139a2fcc

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/leetcode.cn.js | 3 ++-
 plugins/lintcode.js    | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/plugins/leetcode.cn.js b/plugins/leetcode.cn.js
index 53d79ce..9489d61 100644
--- a/plugins/leetcode.cn.js
+++ b/plugins/leetcode.cn.js
@@ -5,11 +5,12 @@ var Plugin = require('../plugin');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/leetcode.cn.md
 //
-var plugin = new Plugin(15, 'leetcode.cn', '2018.05.30',
+var plugin = new Plugin(15, 'leetcode.cn', '2018.10.28',
     'Plugin to talk with leetcode-cn APIs.');
 
 plugin.init = function() {
   const config = require('../config');
+  config.app = 'leetcode.cn';
   config.sys.urls.base            = 'https://leetcode-cn.com';
   config.sys.urls.login           = 'https://leetcode-cn.com/accounts/login/';
   config.sys.urls.problems        = 'https://leetcode-cn.com/api/problems/$category/';
diff --git a/plugins/lintcode.js b/plugins/lintcode.js
index 5e92278..89be320 100644
--- a/plugins/lintcode.js
+++ b/plugins/lintcode.js
@@ -19,7 +19,7 @@ var session = require('../session');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/lintcode.md
 //
-const plugin = new Plugin(15, 'lintcode', '2018.05.30',
+const plugin = new Plugin(15, 'lintcode', '2018.10.28',
     'Plugin to talk with lintcode APIs.');
 
 // FIXME: add more langs
@@ -83,6 +83,7 @@ function _strip(s) {
 }
 
 plugin.init = function() {
+  config.app = 'lintcode';
   config.sys.urls.base           = 'https://www.lintcode.com';
   config.sys.urls.problems       = 'https://www.lintcode.com/api/problems/?page=$page';
   config.sys.urls.problem        = 'https://www.lintcode.com/problem/$slug/description';

From e8fda163ca9770ab0c7f0981dd634b7e5f10f20f Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Sun, 18 Nov 2018 10:51:26 +0800
Subject: [PATCH 14/21] [refactor] keep pace with leetcode-cli 2.5.4

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/github.js   | 3 ++-
 plugins/lintcode.js | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/plugins/github.js b/plugins/github.js
index 4c00e75..b0f8241 100644
--- a/plugins/github.js
+++ b/plugins/github.js
@@ -2,6 +2,7 @@ var path = require('path');
 var url = require('url');
 
 var h = require('../helper');
+var file = require('../file');
 var log = require('../log');
 var Plugin = require('../plugin');
 
@@ -47,7 +48,7 @@ plugin.submitProblem = function(problem, cb) {
       }
 
       ctx.message = 'update ' + filename;
-      ctx.content = new Buffer(h.getFileData(problem.file)).toString('base64');
+      ctx.content = new Buffer(file.data(problem.file)).toString('base64');
 
       var onFileDone = function(e, res) {
         if (e)
diff --git a/plugins/lintcode.js b/plugins/lintcode.js
index 89be320..88c7e3c 100644
--- a/plugins/lintcode.js
+++ b/plugins/lintcode.js
@@ -4,6 +4,7 @@ var request = require('request');
 var util = require('util');
 
 var h = require('../helper');
+var file = require('../file');
 var config = require('../config');
 var log = require('../log');
 var Plugin = require('../plugin');
@@ -218,7 +219,7 @@ function runCode(problem, isTest, cb) {
   opts.headers.referer = problem.link;
   opts.form = {
     problem_id:          problem.id,
-    code:                h.getFileData(problem.file),
+    code:                file.data(problem.file),
     language:            lang.text
   };
   if (isTest) {

From 23f7fdba0d37b1997a2ecef2c636968cb75c77fe Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Sun, 18 Nov 2018 23:41:14 +0800
Subject: [PATCH 15/21] tiny update.

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/cookie.chrome.js | 5 +++--
 plugins/github.js        | 2 +-
 plugins/leetcode.cn.js   | 4 ++--
 plugins/lintcode.js      | 2 +-
 4 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/plugins/cookie.chrome.js b/plugins/cookie.chrome.js
index 13f28f4..0291144 100644
--- a/plugins/cookie.chrome.js
+++ b/plugins/cookie.chrome.js
@@ -9,7 +9,7 @@ var session = require('../session');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/cookie.chrome.md
 //
-var plugin = new Plugin(13, 'cookie.chrome', '2018.05.30',
+var plugin = new Plugin(13, 'cookie.chrome', '2018.11.18',
     'Plugin to reuse Chrome\'s leetcode cookie.',
     ['ffi:win32', 'keytar:darwin', 'ref:win32', 'ref-struct:win32', 'sqlite3']);
 
@@ -18,7 +18,7 @@ plugin.help = function() {
     case 'darwin':
       break;
     case 'linux':
-      log.info('To complete the install: sudo apt install libsecret-tools');
+      log.warn('To complete the install: sudo apt install libsecret-tools');
       break;
     case 'win32':
       break;
@@ -131,6 +131,7 @@ function doDecode(key, queue, cb) {
 Chrome.getCookies = function(cb) {
   var sqlite3 = require('sqlite3');
   var db = new sqlite3.Database(my.getDBPath());
+  db.on('error', cb);
   var KEYS = ['csrftoken', 'LEETCODE_SESSION'];
 
   db.serialize(function() {
diff --git a/plugins/github.js b/plugins/github.js
index b0f8241..6c94e9e 100644
--- a/plugins/github.js
+++ b/plugins/github.js
@@ -11,7 +11,7 @@ var Plugin = require('../plugin');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/github.md
 //
-var plugin = new Plugin(100, 'github', '2018.03.24',
+var plugin = new Plugin(100, 'github', '2018.11.18',
     'Plugin to commit accepted code to your own github repo.',
     ['github@13']);
 
diff --git a/plugins/leetcode.cn.js b/plugins/leetcode.cn.js
index 9489d61..c9b1aef 100644
--- a/plugins/leetcode.cn.js
+++ b/plugins/leetcode.cn.js
@@ -1,3 +1,4 @@
+var config = require('../config');
 var Plugin = require('../plugin');
 
 //
@@ -5,11 +6,10 @@ var Plugin = require('../plugin');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/leetcode.cn.md
 //
-var plugin = new Plugin(15, 'leetcode.cn', '2018.10.28',
+var plugin = new Plugin(15, 'leetcode.cn', '2018.11.18',
     'Plugin to talk with leetcode-cn APIs.');
 
 plugin.init = function() {
-  const config = require('../config');
   config.app = 'leetcode.cn';
   config.sys.urls.base            = 'https://leetcode-cn.com';
   config.sys.urls.login           = 'https://leetcode-cn.com/accounts/login/';
diff --git a/plugins/lintcode.js b/plugins/lintcode.js
index 88c7e3c..18b5c9d 100644
--- a/plugins/lintcode.js
+++ b/plugins/lintcode.js
@@ -20,7 +20,7 @@ var session = require('../session');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/lintcode.md
 //
-const plugin = new Plugin(15, 'lintcode', '2018.10.28',
+const plugin = new Plugin(15, 'lintcode', '2018.11.18',
     'Plugin to talk with lintcode APIs.');
 
 // FIXME: add more langs

From aeb680a7d89ce74a039ce89cbaa3f9ff2ee4fbb7 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Mon, 19 Nov 2018 14:00:28 +0800
Subject: [PATCH 16/21] [cookie.firefox] fail on invalid cookies.

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/cookie.firefox.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/plugins/cookie.firefox.js b/plugins/cookie.firefox.js
index 45d8645..de2db29 100644
--- a/plugins/cookie.firefox.js
+++ b/plugins/cookie.firefox.js
@@ -6,7 +6,7 @@ var session = require('../session');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/cookie.firefox.md
 //
-var plugin = new Plugin(13, 'cookie.firefox', '2017.12.28',
+var plugin = new Plugin(13, 'cookie.firefox', '2018.11.19',
     'Plugin to reuse firefox\'s leetcode cookie.',
     ['glob', 'sqlite3']);
 
@@ -55,7 +55,12 @@ plugin.signin = function(user, cb) {
   log.debug('try to copy leetcode cookies from firefox ...');
   getCookies(function(e, cookies) {
     if (e) {
-      log.error('failed to copy cookies: ' + e);
+      log.error('Failed to copy cookies: ' + e);
+      return plugin.next.signin(user, cb);
+    }
+
+    if (!cookies.LEETCODE_SESSION || !cookies.csrftoken) {
+      log.error('Got invalid cookies: ' + JSON.stringify(cookies));
       return plugin.next.signin(user, cb);
     }
 

From 65cbe605aa704394dc52c385c166b6e7eadb1057 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Sat, 24 Nov 2018 22:27:40 +0800
Subject: [PATCH 17/21] fixes eslint errors.

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 .eslintrc.js                | 29 ++++++++++++++++++++++++-----
 package.json                |  4 ++--
 plugins/company.js          |  4 ++++
 plugins/cookie.chrome.js    |  6 +++---
 plugins/cookie.firefox.js   |  2 +-
 plugins/lintcode.js         | 10 +++++-----
 plugins/solution.discuss.js |  6 +++---
 7 files changed, 42 insertions(+), 19 deletions(-)

diff --git a/.eslintrc.js b/.eslintrc.js
index f274110..0c40bef 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -1,17 +1,36 @@
 module.exports = {
     "env": {
       "browser": false,
-      "node": true,
-      "es6": true
+      "es6": true,
+      "mocha": true,
+      "node": true
     },
-    "extends": "google",
+    "extends": [
+      "google",
+      "eslint:recommended"
+    ],
     "rules": {
+      "block-spacing": [2, "always"],
+      "brace-style": [2, "1tbs", { "allowSingleLine": true }],
+      "camelcase": [2, {properties: "never"}],
       "comma-dangle": 0,
       "curly": 0,
       "key-spacing": [2, {align: "value"}],
-      "max-len": [1, 120],
+      "max-len": [1, 150],
+      "no-console": 1,
+      "no-empty": [2, { "allowEmptyCatch": true }],
+      "no-eval": 1, // we use it on purpose
+      "no-loop-func": 1,
+      "no-multi-spaces": 0,
+      "no-proto": 1,
+      "no-unused-expressions": 1,
+      "no-unused-vars": 1,
       "no-var": 0,
+      "no-warning-comments": 0,
+      "prefer-rest-params": 0,
+      "prefer-spread": 0,
+      "quote-props": 1,
       "quotes": [2, "single", {avoidEscape: true}],
-      "require-jsdoc": 0
+      "require-jsdoc": 0,
     }
 };
diff --git a/package.json b/package.json
index 99fca68..4ea4b95 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   },
   "homepage": "https://github.com/skygragon/leetcode-cli-plugins#readme",
   "devDependencies": {
-    "eslint": "^4.4.1",
-    "eslint-config-google": "^0.9.1"
+    "eslint": "5.9.0",
+    "eslint-config-google": "0.11.0"
   }
 }
diff --git a/plugins/company.js b/plugins/company.js
index 3884ba0..ac48974 100644
--- a/plugins/company.js
+++ b/plugins/company.js
@@ -21,6 +21,7 @@ var COMPONIES = {
   '5': ['amazon', 'bloomberg', 'microsoft'],
   '7': ['apple', 'bloomberg'],
   '8': ['amazon', 'bloomberg', 'microsoft', 'uber'],
+
   '10': ['airbnb', 'facebook', 'google', 'twitter', 'uber'],
   '11': ['bloomberg'],
   '12': ['twitter'],
@@ -84,6 +85,7 @@ var COMPONIES = {
   '94': ['microsoft'],
   '96': ['snapchat'],
   '98': ['amazon', 'bloomberg', 'facebook', 'microsoft'],
+
   '100': ['bloomberg'],
   '101': ['bloomberg', 'linkedin', 'microsoft'],
   '102': ['amazon', 'apple', 'bloomberg', 'facebook', 'linkedin', 'microsoft'],
@@ -532,6 +534,7 @@ var TAGS = {
   '7': ['math'],
   '8': ['math', 'string'],
   '9': ['math'],
+
   '10': ['backtracking', 'dynamic-programming', 'string'],
   '11': ['array', 'two-pointers'],
   '12': ['math', 'string'],
@@ -622,6 +625,7 @@ var TAGS = {
   '97': ['dynamic-programming', 'string'],
   '98': ['depth-first-search', 'tree'],
   '99': ['depth-first-search', 'tree'],
+
   '100': ['depth-first-search', 'tree'],
   '101': ['breadth-first-search', 'depth-first-search', 'tree'],
   '102': ['breadth-first-search', 'tree'],
diff --git a/plugins/cookie.chrome.js b/plugins/cookie.chrome.js
index 0291144..e2d4278 100644
--- a/plugins/cookie.chrome.js
+++ b/plugins/cookie.chrome.js
@@ -28,7 +28,7 @@ plugin.help = function() {
 var Chrome = {};
 
 var ChromeMAC = {
-  getDBPath:   function() {
+  getDBPath: function() {
     return `${process.env.HOME}/Library/Application Support/Google/Chrome/${this.profile}/Cookies`;
   },
   iterations:  1003,
@@ -39,7 +39,7 @@ var ChromeMAC = {
 };
 
 var ChromeLinux = {
-  getDBPath:   function() {
+  getDBPath: function() {
     return `${process.env.HOME}/.config/google-chrome/${this.profile}/Cookies`;
   },
   iterations:  1,
@@ -52,7 +52,7 @@ var ChromeLinux = {
 };
 
 var ChromeWindows = {
-  getDBPath:   function() {
+  getDBPath: function() {
     return path.resolve(process.env.APPDATA || '', `../Local/Google/Chrome/User Data/${this.profile}/Cookies`);
   },
   getPassword: function(cb) { cb(); }
diff --git a/plugins/cookie.firefox.js b/plugins/cookie.firefox.js
index de2db29..f69f869 100644
--- a/plugins/cookie.firefox.js
+++ b/plugins/cookie.firefox.js
@@ -48,7 +48,7 @@ function getCookies(cb) {
       });
     });
   });
-};
+}
 
 plugin.signin = function(user, cb) {
   log.debug('running cookie.firefox.signin');
diff --git a/plugins/lintcode.js b/plugins/lintcode.js
index 18b5c9d..073d12d 100644
--- a/plugins/lintcode.js
+++ b/plugins/lintcode.js
@@ -218,9 +218,9 @@ function runCode(problem, isTest, cb) {
   const opts = makeOpts(config.sys.urls.test);
   opts.headers.referer = problem.link;
   opts.form = {
-    problem_id:          problem.id,
-    code:                file.data(problem.file),
-    language:            lang.text
+    problem_id: problem.id,
+    code:       file.data(problem.file),
+    language:   lang.text
   };
   if (isTest) {
     opts.form.input = problem.testcase;
@@ -330,8 +330,8 @@ plugin.login = function(user, cb) {
       'x-csrftoken': null
     },
     form: {
-      username_or_email:   user.login,
-      password:            user.pass
+      username_or_email: user.login,
+      password:          user.pass
     }
   };
 
diff --git a/plugins/solution.discuss.js b/plugins/solution.discuss.js
index 1289a13..c155637 100644
--- a/plugins/solution.discuss.js
+++ b/plugins/solution.discuss.js
@@ -1,5 +1,4 @@
 var _ = require('underscore');
-var cheerio = require('cheerio');
 var request = require('request');
 
 var log = require('../log');
@@ -24,7 +23,7 @@ function getSolution(problem, lang, cb) {
   var opts = {
     url:  URL_DISCUSSES,
     json: true,
-    qs: {
+    qs:   {
       query: [
         'query fetchTopics($questionId: Int!, $pageNo: Int!, $orderBy: String!) {',
         '  questionTopics(questionId: $questionId, pageNo: $pageNo, orderBy: $orderBy) {',
@@ -42,8 +41,9 @@ function getSolution(problem, lang, cb) {
         '  }',
         '}'
       ].join('\n'),
+
       operationName: 'fetchTopics',
-      variables: JSON.stringify({
+      variables:     JSON.stringify({
         pageNo:     1,
         orderBy:    'most_votes',
         questionId: problem.id

From 9de04127984e08d7d52dc0545c03291d2a69fc97 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Sat, 24 Nov 2018 22:33:01 +0800
Subject: [PATCH 18/21] enable travis

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 .travis.yml | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 .travis.yml

diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..a6f5aa8
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,9 @@
+language: node_js
+node_js:
+  - 10
+os:
+  - linux
+install:
+  - npm install
+script:
+  - npm test

From 6a33c98b09cc6a2332b42df3186cb1f80febb845 Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Sun, 25 Nov 2018 22:19:05 +0800
Subject: [PATCH 19/21] refs #22: show chinese question name.

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/leetcode.cn.js | 98 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 97 insertions(+), 1 deletion(-)

diff --git a/plugins/leetcode.cn.js b/plugins/leetcode.cn.js
index c9b1aef..07d5d2d 100644
--- a/plugins/leetcode.cn.js
+++ b/plugins/leetcode.cn.js
@@ -1,12 +1,18 @@
+'use strict'
+var request = require('request');
+
 var config = require('../config');
+var h = require('../helper');
+var log = require('../log');
 var Plugin = require('../plugin');
+var session = require('../session');
 
 //
 // [Usage]
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/leetcode.cn.md
 //
-var plugin = new Plugin(15, 'leetcode.cn', '2018.11.18',
+var plugin = new Plugin(15, 'leetcode.cn', '2018.11.25',
     'Plugin to talk with leetcode-cn APIs.');
 
 plugin.init = function() {
@@ -27,4 +33,94 @@ plugin.init = function() {
   config.sys.urls.favorite_delete = 'https://leetcode-cn.com/list/api/questions/$hash/$id';
 };
 
+// FIXME: refactor those
+// update options with user credentials
+function signOpts(opts, user) {
+  opts.headers.Cookie = 'LEETCODE_SESSION=' + user.sessionId +
+                        ';csrftoken=' + user.sessionCSRF + ';';
+  opts.headers['X-CSRFToken'] = user.sessionCSRF;
+  opts.headers['X-Requested-With'] = 'XMLHttpRequest';
+}
+
+function makeOpts(url) {
+  const opts = {};
+  opts.url = url;
+  opts.headers = {};
+
+  if (session.isLogin())
+    signOpts(opts, session.getUser());
+  return opts;
+}
+
+function checkError(e, resp, expectedStatus) {
+  if (!e && resp && resp.statusCode !== expectedStatus) {
+    const code = resp.statusCode;
+    log.debug('http error: ' + code);
+
+    if (code === 403 || code === 401) {
+      e = session.errors.EXPIRED;
+    } else {
+      e = {msg: 'http error', statusCode: code};
+    }
+  }
+  return e;
+}
+
+plugin.getProblems = function(cb) {
+  plugin.next.getProblems(function(e, problems) {
+    if (e) return cb(e);
+
+    plugin.getProblemsTitle(function(e, titles) {
+      if (e) return cb(e);
+
+      problems.forEach(function(problem) {
+        const title = titles[problem.fid];
+        if (title)
+          problem.name = title;
+      });
+
+      return cb(null, problems);
+    });
+  });
+};
+
+plugin.getProblemsTitle = function(cb) {
+  log.debug('running leetcode.cn.getProblemNames');
+
+  const opts = makeOpts(config.sys.urls.graphql);
+  opts.headers.Origin = config.sys.urls.base;
+  opts.headers.Referer = 'https://leetcode-cn.com/api/problems/algorithms/';
+
+  opts.json = true;
+  opts.body = {
+    query: [
+      'query getQuestionTranslation($lang: String) {',
+      '  translations: allAppliedQuestionTranslations(lang: $lang) {',
+      '    title',
+      '    question {',
+      '      questionId',
+      '    }',
+      '  }',
+      '}',
+      ''
+    ].join('\n'),
+    variables:     {},
+    operationName: 'getQuestionTranslation'
+  };
+
+  const spin = h.spin('Downloading questions titles');
+  request.post(opts, function(e, resp, body) {
+    spin.stop();
+    e = checkError(e, resp, 200);
+    if (e) return cb(e);
+
+    const titles = [];
+    body.data.translations.forEach(function(x) {
+      titles[x.question.questionId] = x.title;
+    });
+
+    return cb(null, titles);
+  });
+};
+
 module.exports = plugin;

From e0b4613c842f69a04bcf84e836d929f8ba774e5d Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Sun, 3 Feb 2019 12:27:53 +0800
Subject: [PATCH 20/21] fixes #28: [solution] fixes 400 error

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/solution.discuss.js | 46 +++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 25 deletions(-)

diff --git a/plugins/solution.discuss.js b/plugins/solution.discuss.js
index c155637..b3a9a13 100644
--- a/plugins/solution.discuss.js
+++ b/plugins/solution.discuss.js
@@ -11,7 +11,7 @@ var session = require('../session');
 //
 // https://github.com/skygragon/leetcode-cli-plugins/blob/master/docs/solution.discuss.md
 //
-var plugin = new Plugin(200, 'solution.discuss', '2018.04.14',
+var plugin = new Plugin(200, 'solution.discuss', '2019.02.03',
     'Plugin to fetch most voted solution in discussions.');
 
 var URL_DISCUSSES = 'https://leetcode.com/graphql';
@@ -20,14 +20,22 @@ var URL_DISCUSS = 'https://leetcode.com/problems/$slug/discuss/$id';
 function getSolution(problem, lang, cb) {
   if (!problem) return cb();
 
+  if (lang === 'python3') lang = 'python';
+
   var opts = {
     url:  URL_DISCUSSES,
     json: true,
-    qs:   {
+    body:  {
       query: [
-        'query fetchTopics($questionId: Int!, $pageNo: Int!, $orderBy: String!) {',
-        '  questionTopics(questionId: $questionId, pageNo: $pageNo, orderBy: $orderBy) {',
-        '    data {',
+        'query questionTopicsList($questionId: String!, $orderBy: TopicSortingOption, $skip: Int, $query: String, $first: Int!, $tags: [String!]) {',
+        '  questionTopicsList(questionId: $questionId, orderBy: $orderBy, skip: $skip, query: $query, first: $first, tags: $tags) {',
+        '    ...TopicsList',
+        '  }',
+        '}',
+        'fragment TopicsList on TopicConnection {',
+        '  totalNum',
+        '  edges {',
+        '    node {',
         '      id',
         '      title',
         '      post {',
@@ -42,11 +50,14 @@ function getSolution(problem, lang, cb) {
         '}'
       ].join('\n'),
 
-      operationName: 'fetchTopics',
+      operationName: 'questionTopicsList',
       variables:     JSON.stringify({
-        pageNo:     1,
+        query:      '',
+        first:      1,
+        skip:       0,
         orderBy:    'most_votes',
-        questionId: problem.id
+        questionId: '' + problem.id,
+        tags:       [lang]
       })
     }
   };
@@ -55,23 +66,8 @@ function getSolution(problem, lang, cb) {
     if (resp.statusCode !== 200)
       return cb({msg: 'http error', statusCode: resp.statusCode});
 
-    var langs = [lang];
-    // try to find more compatible langs
-    if (lang === 'cpp') langs.push('c++');
-    if (lang === 'csharp') langs.push('c#');
-    if (lang === 'golang') langs.push('go');
-    if (lang === 'javascript') langs.push('js');
-    if (lang === 'python3') langs.push('python');
-
-    var solutions = body.data.questionTopics.data;
-    var solution = _.find(solutions, function(x) {
-      var keys = x.title.toLowerCase().split(/[^\w+]/);
-      for (var i = 0; i < keys.length; ++i) {
-        if (langs.indexOf(keys[i]) >= 0) return true;
-      }
-      return false;
-    });
-
+    const solutions = body.data.questionTopicsList.edges;
+    const solution = solutions.length > 0 ? solutions[0].node : null;
     return cb(null, solution);
   });
 }

From 752e94e8a755106106af65af9d9b831d9810c4cd Mon Sep 17 00:00:00 2001
From: Eric Wang <skygragon@gmail.com>
Date: Sun, 3 Feb 2019 12:39:39 +0800
Subject: [PATCH 21/21] fixes ut error

Signed-off-by: Eric Wang <skygragon@gmail.com>
---
 plugins/solution.discuss.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/plugins/solution.discuss.js b/plugins/solution.discuss.js
index b3a9a13..e78b90a 100644
--- a/plugins/solution.discuss.js
+++ b/plugins/solution.discuss.js
@@ -1,4 +1,3 @@
-var _ = require('underscore');
 var request = require('request');
 
 var log = require('../log');
@@ -25,7 +24,7 @@ function getSolution(problem, lang, cb) {
   var opts = {
     url:  URL_DISCUSSES,
     json: true,
-    body:  {
+    body: {
       query: [
         'query questionTopicsList($questionId: String!, $orderBy: TopicSortingOption, $skip: Int, $query: String, $first: Int!, $tags: [String!]) {',
         '  questionTopicsList(questionId: $questionId, orderBy: $orderBy, skip: $skip, query: $query, first: $first, tags: $tags) {',